multiple namespaces reuse the same long poll connection

apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/repository/AppNamespaceRepository.java

@@ -5,14 +5,19 @@ import org.springframework.data.repository.PagingAndSortingRepository;
 import com.ctrip.framework.apollo.common.entity.AppNamespace;
 
 import java.util.List;
+import java.util.Set;
 
 
 public interface AppNamespaceRepository extends PagingAndSortingRepository<AppNamespace, Long>{
 
   AppNamespace findByAppIdAndName(String appId, String namespaceName);
 
+  List<AppNamespace> findByAppIdAndNameIn(String appId, Set<String> namespaceNames);
+
   AppNamespace findByNameAndIsPublicTrue(String namespaceName);
 
+  List<AppNamespace> findByNameInAndIsPublicTrue(Set<String> namespaceNames);
+
   List<AppNamespace> findByAppIdAndIsPublic(String appId, boolean isPublic);
 
 }

apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/repository/ReleaseMessageRepository.java

@@ -2,7 +2,9 @@ package com.ctrip.framework.apollo.biz.repository;
 
 import com.ctrip.framework.apollo.biz.entity.ReleaseMessage;
 
+import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.PagingAndSortingRepository;
+import org.springframework.data.repository.query.Param;
 
 import java.util.Collection;
 import java.util.List;
@@ -16,4 +18,7 @@ public interface ReleaseMessageRepository extends PagingAndSortingRepository<Rel
   ReleaseMessage findTopByOrderByIdDesc();
 
   ReleaseMessage findTopByMessageInOrderByIdDesc(Collection<String> messages);
+
+  @Query("select message, max(id) as id from ReleaseMessage where message in :messages group by message")
+  List<Object[]> findLatestReleaseMessagesGroupByMessages(@Param("messages") Collection<String> messages);
 }

apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/AppNamespaceService.java

 package com.ctrip.framework.apollo.biz.service;
 
 import com.google.common.base.Preconditions;
+import com.google.common.base.Strings;
 
-import java.util.List;
-import java.util.Objects;
-
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.stereotype.Service;
-import org.springframework.transaction.annotation.Transactional;
-
+import com.ctrip.framework.apollo.biz.entity.Audit;
 import com.ctrip.framework.apollo.biz.entity.Cluster;
 import com.ctrip.framework.apollo.biz.entity.Namespace;
-import com.ctrip.framework.apollo.common.entity.AppNamespace;
-import com.ctrip.framework.apollo.biz.entity.Audit;
 import com.ctrip.framework.apollo.biz.repository.AppNamespaceRepository;
+import com.ctrip.framework.apollo.common.entity.AppNamespace;
 import com.ctrip.framework.apollo.common.utils.BeanUtils;
 import com.ctrip.framework.apollo.core.ConfigConsts;
 import com.ctrip.framework.apollo.core.enums.ConfigFileFormat;
 import com.ctrip.framework.apollo.core.exception.ServiceException;
 import com.ctrip.framework.apollo.core.utils.StringUtils;
 
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+
 @Service
 public class AppNamespaceService {
 
@@ -45,6 +48,14 @@ public class AppNamespaceService {
     return appNamespaceRepository.findByNameAndIsPublicTrue(namespaceName);
   }
 
+  public List<AppNamespace> findPublicNamespacesByNames(Set<String> namespaceNames) {
+    if (namespaceNames == null || namespaceNames.isEmpty()) {
+      return Collections.EMPTY_LIST;
+    }
+
+    return appNamespaceRepository.findByNameInAndIsPublicTrue(namespaceNames);
+  }
+
   public List<AppNamespace> findPrivateAppNamespace(String appId){
     return appNamespaceRepository.findByAppIdAndIsPublic(appId, false);
   }
@@ -54,6 +65,14 @@ public class AppNamespaceService {
     return appNamespaceRepository.findByAppIdAndName(appId, namespaceName);
   }
 
+  public List<AppNamespace> findByAppIdAndNamespaces(String appId, Set<String> namespaceNames) {
+    Preconditions.checkArgument(!Strings.isNullOrEmpty(appId), "appId must not be null");
+    if (namespaceNames == null || namespaceNames.isEmpty()) {
+      return Collections.EMPTY_LIST;
+    }
+    return appNamespaceRepository.findByAppIdAndNameIn(appId, namespaceNames);
+  }
+
   @Transactional
   public void createDefaultAppNamespace(String appId, String createBy) {
     if (!isAppNamespaceNameUnique(appId, ConfigConsts.NAMESPACE_APPLICATION)) {

apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ReleaseMessageService.java

 package com.ctrip.framework.apollo.biz.service;
 
+import com.google.common.collect.Lists;
+
 import com.ctrip.framework.apollo.biz.entity.ReleaseMessage;
 import com.ctrip.framework.apollo.biz.repository.ReleaseMessageRepository;
+import com.dianping.cat.Cat;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 import java.util.Collection;
+import java.util.List;
+import java.util.Map;
 
 /**
  * @author Jason Song(song_s@ctrip.com)
@@ -19,4 +24,20 @@ public class ReleaseMessageService {
   public ReleaseMessage findLatestReleaseMessageForMessages(Collection<String> messages) {
     return releaseMessageRepository.findTopByMessageInOrderByIdDesc(messages);
   }
+
+  public List<ReleaseMessage> findLatestReleaseMessagesGroupByMessages(Collection<String> messages) {
+    List<Object[]> result =
+        releaseMessageRepository.findLatestReleaseMessagesGroupByMessages(messages);
+    List<ReleaseMessage> releaseMessages = Lists.newArrayList();
+    for (Object[] o : result) {
+      try {
+        ReleaseMessage releaseMessage = new ReleaseMessage((String) o[0]);
+        releaseMessage.setId((Long) o[1]);
+        releaseMessages.add(releaseMessage);
+      } catch (Exception ex) {
+        Cat.logError("Parsing LatestReleaseMessagesGroupByMessages failed", ex);
+      }
+    }
+    return releaseMessages;
+  }
 }

apollo-client/pom.xml

@@ -64,6 +64,11 @@
 			<artifactId>jetty-server</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>commons-logging</groupId>
+			<artifactId>commons-logging</artifactId>
+			<scope>test</scope>
+		</dependency>
 		<!-- end of test -->
 		<!-- dal-jdbc -->
 		<dependency>

apollo-client/src/main/java/com/ctrip/framework/apollo/build/ComponentConfigurator.java

@@ -2,6 +2,7 @@ package com.ctrip.framework.apollo.build;
 
 import com.ctrip.framework.apollo.internals.ConfigServiceLocator;
 import com.ctrip.framework.apollo.internals.DefaultConfigManager;
+import com.ctrip.framework.apollo.internals.RemoteConfigLongPollService;
 import com.ctrip.framework.apollo.spi.DefaultConfigFactory;
 import com.ctrip.framework.apollo.spi.DefaultConfigFactoryManager;
 import com.ctrip.framework.apollo.spi.DefaultConfigRegistry;
@@ -33,6 +34,7 @@ public class ComponentConfigurator extends AbstractResourceConfigurator {
     all.add(A(ConfigUtil.class));
     all.add(A(HttpUtil.class));
     all.add(A(ConfigServiceLocator.class));
+    all.add(A(RemoteConfigLongPollService.class));
 
     return all;
   }

apollo-client/src/main/java/com/ctrip/framework/apollo/internals/RemoteConfigLongPollService.java

+package com.ctrip.framework.apollo.internals;
+
+import com.google.common.base.Joiner;
+import com.google.common.base.Strings;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.Multimaps;
+import com.google.common.escape.Escaper;
+import com.google.common.net.UrlEscapers;
+import com.google.common.reflect.TypeToken;
+import com.google.common.util.concurrent.RateLimiter;
+import com.google.gson.Gson;
+
+import com.ctrip.framework.apollo.core.ConfigConsts;
+import com.ctrip.framework.apollo.core.dto.ApolloConfigNotification;
+import com.ctrip.framework.apollo.core.dto.ServiceDTO;
+import com.ctrip.framework.apollo.core.enums.ConfigFileFormat;
+import com.ctrip.framework.apollo.core.schedule.ExponentialSchedulePolicy;
+import com.ctrip.framework.apollo.core.schedule.SchedulePolicy;
+import com.ctrip.framework.apollo.core.utils.ApolloThreadFactory;
+import com.ctrip.framework.apollo.exceptions.ApolloConfigException;
+import com.ctrip.framework.apollo.util.ConfigUtil;
+import com.ctrip.framework.apollo.util.ExceptionUtil;
+import com.ctrip.framework.apollo.util.http.HttpRequest;
+import com.ctrip.framework.apollo.util.http.HttpResponse;
+import com.ctrip.framework.apollo.util.http.HttpUtil;
+import com.dianping.cat.Cat;
+import com.dianping.cat.message.Message;
+import com.dianping.cat.message.Transaction;
+
+import org.codehaus.plexus.personality.plexus.lifecycle.phase.Initializable;
+import org.codehaus.plexus.personality.plexus.lifecycle.phase.InitializationException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.unidal.lookup.annotation.Inject;
+import org.unidal.lookup.annotation.Named;
+
+import java.lang.reflect.Type;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * @author Jason Song(song_s@ctrip.com)
+ */
+@Named(type = RemoteConfigLongPollService.class)
+public class RemoteConfigLongPollService implements Initializable {
+  private static final Logger logger = LoggerFactory.getLogger(RemoteConfigLongPollService.class);
+  private static final Joiner STRING_JOINER = Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR);
+  private static final Joiner.MapJoiner MAP_JOINER = Joiner.on("&").withKeyValueSeparator("=");
+  private static final Escaper queryParamEscaper = UrlEscapers.urlFormParameterEscaper();
+  private static final long INIT_NOTIFICATION_ID = -1;
+  private final ExecutorService m_longPollingService;
+  private final AtomicBoolean m_longPollingStopped;
+  private SchedulePolicy m_longPollFailSchedulePolicyInSecond;
+  private RateLimiter m_longPollRateLimiter;
+  private final AtomicBoolean m_longPollStarted;
+  private final Multimap<String, RemoteConfigRepository> m_longPollNamespaces;
+  private final Map<String, Long> m_notifications;
+  private Type m_responseType;
+  private Gson gson;
+  @Inject
+  private ConfigUtil m_configUtil;
+  @Inject
+  private HttpUtil m_httpUtil;
+  @Inject
+  private ConfigServiceLocator m_serviceLocator;
+
+  /**
+   * Constructor.
+   */
+  public RemoteConfigLongPollService() {
+    m_longPollFailSchedulePolicyInSecond = new ExponentialSchedulePolicy(1, 120); //in second
+    m_longPollingStopped = new AtomicBoolean(false);
+    m_longPollingService = Executors.newSingleThreadExecutor(
+        ApolloThreadFactory.create("RemoteConfigLongPollService", true));
+    m_longPollStarted = new AtomicBoolean(false);
+    m_longPollNamespaces =
+        Multimaps.synchronizedSetMultimap(HashMultimap.<String, RemoteConfigRepository>create());
+    m_notifications = Maps.newConcurrentMap();
+    m_responseType = new TypeToken<List<ApolloConfigNotification>>() {
+    }.getType();
+    gson = new Gson();
+  }
+
+  @Override
+  public void initialize() throws InitializationException {
+    m_longPollRateLimiter = RateLimiter.create(m_configUtil.getLongPollQPS());
+  }
+
+  public boolean submit(String namespace, RemoteConfigRepository remoteConfigRepository) {
+    boolean added = m_longPollNamespaces.put(namespace, remoteConfigRepository);
+    m_notifications.putIfAbsent(namespace, INIT_NOTIFICATION_ID);
+    if (!m_longPollStarted.get()) {
+      startLongPolling();
+    }
+    return added;
+  }
+
+  private void startLongPolling() {
+    if (!m_longPollStarted.compareAndSet(false, true)) {
+      //already started
+      return;
+    }
+    try {
+      final String appId = m_configUtil.getAppId();
+      final String cluster = m_configUtil.getCluster();
+      final String dataCenter = m_configUtil.getDataCenter();
+      m_longPollingService.submit(new Runnable() {
+        @Override
+        public void run() {
+          doLongPollingRefresh(appId, cluster, dataCenter);
+        }
+      });
+    } catch (Throwable ex) {
+      m_longPollStarted.set(false);
+      ApolloConfigException exception =
+          new ApolloConfigException("Schedule long polling refresh failed", ex);
+      Cat.logError(exception);
+      logger.warn(ExceptionUtil.getDetailMessage(exception));
+    }
+  }
+
+  void stopLongPollingRefresh() {
+    this.m_longPollingStopped.compareAndSet(false, true);
+  }
+
+  private void doLongPollingRefresh(String appId, String cluster, String dataCenter) {
+    final Random random = new Random();
+    ServiceDTO lastServiceDto = null;
+    while (!m_longPollingStopped.get() && !Thread.currentThread().isInterrupted()) {
+      if (!m_longPollRateLimiter.tryAcquire(5, TimeUnit.SECONDS)) {
+        //wait at most 5 seconds
+        try {
+          TimeUnit.SECONDS.sleep(5);
+        } catch (InterruptedException e) {
+        }
+      }
+      Transaction transaction = Cat.newTransaction("Apollo.ConfigService", "pollNotification");
+      try {
+        if (lastServiceDto == null) {
+          List<ServiceDTO> configServices = getConfigServices();
+          lastServiceDto = configServices.get(random.nextInt(configServices.size()));
+        }
+
+        String url =
+            assembleLongPollRefreshUrl(lastServiceDto.getHomepageUrl(), appId, cluster, dataCenter,
+                m_notifications);
+
+        logger.debug("Long polling from {}", url);
+        HttpRequest request = new HttpRequest(url);
+        //longer timeout for read - 10 minutes
+        request.setReadTimeout(600000);
+
+        transaction.addData("Url", url);
+
+        final HttpResponse<List<ApolloConfigNotification>> response =
+            m_httpUtil.doGet(request, m_responseType);
+
+        logger.debug("Long polling response: {}, url: {}", response.getStatusCode(), url);
+        if (response.getStatusCode() == 200 && response.getBody() != null) {
+          updateNotifications(response.getBody());
+          transaction.addData("Result", response.getBody().toString());
+          notify(lastServiceDto, response.getBody());
+        }
+
+        m_longPollFailSchedulePolicyInSecond.success();
+        transaction.addData("StatusCode", response.getStatusCode());
+        transaction.setStatus(Message.SUCCESS);
+      } catch (Throwable ex) {
+        lastServiceDto = null;
+        Cat.logError(ex);
+        transaction.setStatus(ex);
+        long sleepTimeInSecond = m_longPollFailSchedulePolicyInSecond.fail();
+        logger.warn(
+            "Long polling failed, will retry in {} seconds. appId: {}, cluster: {}, namespaces: {}, reason: {}",
+            sleepTimeInSecond, appId, cluster, assembleNamespaces(),
+            ExceptionUtil.getDetailMessage(ex));
+        try {
+          TimeUnit.SECONDS.sleep(sleepTimeInSecond);
+        } catch (InterruptedException ie) {
+          //ignore
+        }
+      } finally {
+        transaction.complete();
+      }
+    }
+  }
+
+  private void notify(ServiceDTO lastServiceDto, List<ApolloConfigNotification> notifications) {
+    if (notifications == null || notifications.isEmpty()) {
+      return;
+    }
+    for (ApolloConfigNotification notification : notifications) {
+      String namespaceName = notification.getNamespaceName();
+      //create a new list to avoid ConcurrentModificationException
+      List<RemoteConfigRepository> toBeNotified =
+          Lists.newArrayList(m_longPollNamespaces.get(namespaceName));
+      //since .properties are filtered out by default, so we need to check if there is any listener for it
+      toBeNotified.addAll(m_longPollNamespaces
+          .get(String.format("%s.%s", namespaceName, ConfigFileFormat.Properties.getValue())));
+      for (RemoteConfigRepository remoteConfigRepository : toBeNotified) {
+        try {
+          remoteConfigRepository.onLongPollNotified(lastServiceDto);
+        } catch (Throwable ex) {
+          Cat.logError(ex);
+        }
+      }
+    }
+  }
+
+  private void updateNotifications(List<ApolloConfigNotification> deltaNotifications) {
+    for (ApolloConfigNotification notification : deltaNotifications) {
+      if (Strings.isNullOrEmpty(notification.getNamespaceName())) {
+        continue;
+      }
+      m_notifications.put(notification.getNamespaceName(), notification.getNotificationId());
+    }
+  }
+
+  private String assembleNamespaces() {
+    return STRING_JOINER.join(m_longPollNamespaces.keySet());
+  }
+
+  String assembleLongPollRefreshUrl(String uri, String appId, String cluster, String dataCenter,
+                                    Map<String, Long> notificationsMap) {
+    Map<String, String> queryParams = Maps.newHashMap();
+    queryParams.put("appId", queryParamEscaper.escape(appId));
+    queryParams.put("cluster", queryParamEscaper.escape(cluster));
+    queryParams
+        .put("notifications", queryParamEscaper.escape(assembleNotifications(notificationsMap)));
+
+    if (!Strings.isNullOrEmpty(dataCenter)) {
+      queryParams.put("dataCenter", queryParamEscaper.escape(dataCenter));
+    }
+    String localIp = m_configUtil.getLocalIp();
+    if (!Strings.isNullOrEmpty(localIp)) {
+      queryParams.put("ip", queryParamEscaper.escape(localIp));
+    }
+
+    String params = MAP_JOINER.join(queryParams);
+    if (!uri.endsWith("/")) {
+      uri += "/";
+    }
+
+    return uri + "notifications/v2?" + params;
+  }
+
+  String assembleNotifications(Map<String, Long> notificationsMap) {
+    List<ApolloConfigNotification> notifications = Lists.newArrayList();
+    for (Map.Entry<String, Long> entry : notificationsMap.entrySet()) {
+      ApolloConfigNotification notification = new ApolloConfigNotification();
+      notification.setNamespaceName(entry.getKey());
+      notification.setNotificationId(entry.getValue());
+      notifications.add(notification);
+    }
+    return gson.toJson(notifications);
+  }
+
+  private List<ServiceDTO> getConfigServices() {
+    List<ServiceDTO> services = m_serviceLocator.getConfigServices();
+    if (services.size() == 0) {
+      throw new ApolloConfigException("No available config service");
+    }
+
+    return services;
+  }
+}

apollo-client/src/main/java/com/ctrip/framework/apollo/internals/RemoteConfigRepository.java

@@ -11,14 +11,10 @@ import com.google.common.util.concurrent.RateLimiter;
 import com.ctrip.framework.apollo.Apollo;
 import com.ctrip.framework.apollo.core.ConfigConsts;
 import com.ctrip.framework.apollo.core.dto.ApolloConfig;
-import com.ctrip.framework.apollo.core.dto.ApolloConfigNotification;
 import com.ctrip.framework.apollo.core.dto.ServiceDTO;
-import com.ctrip.framework.apollo.core.schedule.ExponentialSchedulePolicy;
-import com.ctrip.framework.apollo.core.schedule.SchedulePolicy;
 import com.ctrip.framework.apollo.core.utils.ApolloThreadFactory;
 import com.ctrip.framework.apollo.exceptions.ApolloConfigException;
 import com.ctrip.framework.apollo.util.ConfigUtil;
-import com.ctrip.framework.apollo.util.ExceptionUtil;
 import com.ctrip.framework.apollo.util.http.HttpRequest;
 import com.ctrip.framework.apollo.util.http.HttpResponse;
 import com.ctrip.framework.apollo.util.http.HttpUtil;
@@ -36,12 +32,9 @@ import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
-import java.util.Random;
-import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
 
 /**
@@ -55,15 +48,11 @@ public class RemoteConfigRepository extends AbstractConfigRepository {
   private final ConfigServiceLocator m_serviceLocator;
   private final HttpUtil m_httpUtil;
   private final ConfigUtil m_configUtil;
+  private final RemoteConfigLongPollService remoteConfigLongPollService;
   private volatile AtomicReference<ApolloConfig> m_configCache;
   private final String m_namespace;
   private final static ScheduledExecutorService m_executorService;
-  private final ExecutorService m_longPollingService;
-  private final AtomicBoolean m_longPollingStopped;
-  private SchedulePolicy m_longPollFailSchedulePolicyInSecond;
   private AtomicReference<ServiceDTO> m_longPollServiceDto;
-  private AtomicReference<ApolloConfigNotification> m_longPollResult;
-  private RateLimiter m_longPollRateLimiter;
   private RateLimiter m_loadConfigRateLimiter;
   private static final Escaper pathEscaper = UrlEscapers.urlPathSegmentEscaper();
   private static final Escaper queryParamEscaper = UrlEscapers.urlFormParameterEscaper();
@@ -86,17 +75,12 @@ public class RemoteConfigRepository extends AbstractConfigRepository {
       m_configUtil = m_container.lookup(ConfigUtil.class);
       m_httpUtil = m_container.lookup(HttpUtil.class);
       m_serviceLocator = m_container.lookup(ConfigServiceLocator.class);
+      remoteConfigLongPollService = m_container.lookup(RemoteConfigLongPollService.class);
     } catch (ComponentLookupException ex) {
       Cat.logError(ex);
       throw new ApolloConfigException("Unable to load component!", ex);
     }
-    m_longPollFailSchedulePolicyInSecond = new ExponentialSchedulePolicy(1, 120); //in second
-    m_longPollingStopped = new AtomicBoolean(false);
-    m_longPollingService = Executors.newSingleThreadExecutor(
-        ApolloThreadFactory.create("RemoteConfigRepository-LongPolling", true));
     m_longPollServiceDto = new AtomicReference<>();
-    m_longPollResult = new AtomicReference<>();
-    m_longPollRateLimiter = RateLimiter.create(m_configUtil.getLongPollQPS());
     m_loadConfigRateLimiter = RateLimiter.create(m_configUtil.getLoadConfigQPS());
     this.trySync();
     this.schedulePeriodicRefresh();
@@ -119,7 +103,7 @@ public class RemoteConfigRepository extends AbstractConfigRepository {
   private void schedulePeriodicRefresh() {
     logger.debug("Schedule periodic refresh with interval: {} {}",
         m_configUtil.getRefreshInterval(), m_configUtil.getRefreshIntervalTimeUnit());
-    this.m_executorService.scheduleAtFixedRate(
+    m_executorService.scheduleAtFixedRate(
         new Runnable() {
           @Override
           public void run() {
@@ -271,63 +255,11 @@ public class RemoteConfigRepository extends AbstractConfigRepository {
   }
 
   private void scheduleLongPollingRefresh() {
-    try {
-      final String appId = m_configUtil.getAppId();
-      final String cluster = m_configUtil.getCluster();
-      final String dataCenter = m_configUtil.getDataCenter();
-      m_longPollingService.submit(new Runnable() {
-        @Override
-        public void run() {
-          doLongPollingRefresh(appId, cluster, dataCenter);
-        }
-      });
-    } catch (Throwable ex) {
-      ApolloConfigException exception =
-          new ApolloConfigException("Schedule long polling refresh failed", ex);
-      Cat.logError(exception);
-      logger.warn(ExceptionUtil.getDetailMessage(exception));
-    }
-  }
-
-  private void doLongPollingRefresh(String appId, String cluster, String dataCenter) {
-    final Random random = new Random();
-    ServiceDTO lastServiceDto = null;
-    while (!m_longPollingStopped.get() && !Thread.currentThread().isInterrupted()) {
-      if (!m_longPollRateLimiter.tryAcquire(5, TimeUnit.SECONDS)) {
-        //wait at most 5 seconds
-        try {
-          TimeUnit.SECONDS.sleep(5);
-        } catch (InterruptedException e) {
-        }
-      }
-      Transaction transaction = Cat.newTransaction("Apollo.ConfigService", "pollNotification");
-      try {
-        if (lastServiceDto == null) {
-          List<ServiceDTO> configServices = getConfigServices();
-          lastServiceDto = configServices.get(random.nextInt(configServices.size()));
+    remoteConfigLongPollService.submit(m_namespace, this);
   }
 
-        String url =
-            assembleLongPollRefreshUrl(lastServiceDto.getHomepageUrl(), appId, cluster,
-                m_namespace, dataCenter, m_longPollResult.get());
-
-        logger.debug("Long polling from {}", url);
-        HttpRequest request = new HttpRequest(url);
-        //longer timeout for read - 1 minute
-        request.setReadTimeout(60000);
-
-        transaction.addData("Url", url);
-
-        HttpResponse<ApolloConfigNotification> response =
-            m_httpUtil.doGet(request, ApolloConfigNotification.class);
-
-        logger.debug("Long polling response: {}, url: {}", response.getStatusCode(), url);
-        if (response.getStatusCode() == 200) {
-          m_longPollServiceDto.set(lastServiceDto);
-          if (response.getBody() != null) {
-            m_longPollResult.set(response.getBody());
-            transaction.addData("Result", response.getBody().toString());
-          }
+  public void onLongPollNotified(ServiceDTO longPollNotifiedServiceDto) {
+    m_longPollServiceDto.set(longPollNotifiedServiceDto);
     m_executorService.submit(new Runnable() {
       @Override
       public void run() {
@@ -336,63 +268,6 @@ public class RemoteConfigRepository extends AbstractConfigRepository {
     });
   }
 
-        m_longPollFailSchedulePolicyInSecond.success();
-        transaction.addData("StatusCode", response.getStatusCode());
-        transaction.setStatus(Message.SUCCESS);
-      } catch (Throwable ex) {
-        lastServiceDto = null;
-        Cat.logError(ex);
-        transaction.setStatus(ex);
-        long sleepTimeInSecond = m_longPollFailSchedulePolicyInSecond.fail();
-        logger.warn(
-            "Long polling failed, will retry in {} seconds. appId: {}, cluster: {}, namespace: {}, reason: {}",
-            sleepTimeInSecond, appId, cluster, m_namespace, ExceptionUtil.getDetailMessage(ex));
-        try {
-          TimeUnit.SECONDS.sleep(sleepTimeInSecond);
-        } catch (InterruptedException ie) {
-          //ignore
-        }
-      } finally {
-        transaction.complete();
-      }
-    }
-  }
-
-  String assembleLongPollRefreshUrl(String uri, String appId, String cluster,
-                                            String namespace, String dataCenter,
-                                            ApolloConfigNotification previousResult) {
-    Map<String, String> queryParams = Maps.newHashMap();
-    queryParams.put("appId", queryParamEscaper.escape(appId));
-    queryParams.put("cluster", queryParamEscaper.escape(cluster));
-
-    if (!Strings.isNullOrEmpty(namespace)) {
-      queryParams.put("namespace", queryParamEscaper.escape(namespace));
-    }
-    if (!Strings.isNullOrEmpty(dataCenter)) {
-      queryParams.put("dataCenter", queryParamEscaper.escape(dataCenter));
-    }
-    String localIp = m_configUtil.getLocalIp();
-    if (!Strings.isNullOrEmpty(localIp)) {
-      queryParams.put("ip", queryParamEscaper.escape(localIp));
-    }
-
-    if (previousResult != null) {
-      //number doesn't need encode
-      queryParams.put("notificationId", String.valueOf(previousResult.getNotificationId()));
-    }
-
-    String params = MAP_JOINER.join(queryParams);
-    if (!uri.endsWith("/")) {
-      uri += "/";
-    }
-
-    return uri + "notifications?" + params;
-  }
-
-  void stopLongPollingRefresh() {
-    this.m_longPollingStopped.compareAndSet(false, true);
-  }
-
   private List<ServiceDTO> getConfigServices() {
     List<ServiceDTO> services = m_serviceLocator.getConfigServices();
     if (services.size() == 0) {

apollo-client/src/main/java/com/ctrip/framework/apollo/util/ConfigUtil.java

@@ -96,7 +96,7 @@ public class ConfigUtil {
   }
 
   public String getLocalIp() {
-    return Networks.forIp().getLocalHostAddress();
+    return Foundation.net().getHostAddress();
   }
 
   public String getMetaServerDomainName() {

apollo-client/src/main/resources/META-INF/plexus/components.xml

@@ -30,6 +30,15 @@
 			<role>com.ctrip.framework.apollo.util.ConfigUtil</role>
 			<implementation>com.ctrip.framework.apollo.util.ConfigUtil</implementation>
 		</component>
+		<component>
+			<role>com.ctrip.framework.apollo.util.http.HttpUtil</role>
+			<implementation>com.ctrip.framework.apollo.util.http.HttpUtil</implementation>
+			<requirements>
+				<requirement>
+					<role>com.ctrip.framework.apollo.util.ConfigUtil</role>
+				</requirement>
+			</requirements>
+		</component>
 		<component>
 			<role>com.ctrip.framework.apollo.internals.ConfigServiceLocator</role>
 			<implementation>com.ctrip.framework.apollo.internals.ConfigServiceLocator</implementation>
@@ -43,12 +52,18 @@
 			</requirements>
 		</component>
 		<component>
-			<role>com.ctrip.framework.apollo.util.http.HttpUtil</role>
-			<implementation>com.ctrip.framework.apollo.util.http.HttpUtil</implementation>
+			<role>com.ctrip.framework.apollo.internals.RemoteConfigLongPollService</role>
+			<implementation>com.ctrip.framework.apollo.internals.RemoteConfigLongPollService</implementation>
 			<requirements>
 				<requirement>
 					<role>com.ctrip.framework.apollo.util.ConfigUtil</role>
 				</requirement>
+				<requirement>
+					<role>com.ctrip.framework.apollo.util.http.HttpUtil</role>
+				</requirement>
+				<requirement>
+					<role>com.ctrip.framework.apollo.internals.ConfigServiceLocator</role>
+				</requirement>
 			</requirements>
 		</component>
 	</components>

apollo-client/src/test/java/com/ctrip/framework/apollo/AllTests.java

@@ -6,6 +6,7 @@ import com.ctrip.framework.apollo.internals.DefaultConfigManagerTest;
 import com.ctrip.framework.apollo.internals.DefaultConfigTest;
 import com.ctrip.framework.apollo.internals.LocalFileConfigRepositoryTest;
 import com.ctrip.framework.apollo.internals.PropertiesConfigFileTest;
+import com.ctrip.framework.apollo.internals.RemoteConfigLongPollServiceTest;
 import com.ctrip.framework.apollo.internals.RemoteConfigRepositoryTest;
 import com.ctrip.framework.apollo.internals.SimpleConfigTest;
 import com.ctrip.framework.apollo.internals.XmlConfigFileTest;
@@ -23,7 +24,8 @@ import org.junit.runners.Suite.SuiteClasses;
     ConfigServiceTest.class, DefaultConfigRegistryTest.class, DefaultConfigFactoryManagerTest.class,
     DefaultConfigManagerTest.class, DefaultConfigTest.class, LocalFileConfigRepositoryTest.class,
     RemoteConfigRepositoryTest.class, SimpleConfigTest.class, DefaultConfigFactoryTest.class,
-    ConfigIntegrationTest.class, ExceptionUtilTest.class, XmlConfigFileTest.class, PropertiesConfigFileTest.class
+    ConfigIntegrationTest.class, ExceptionUtilTest.class, XmlConfigFileTest.class,
+    PropertiesConfigFileTest.class, RemoteConfigLongPollServiceTest.class
 })
 public class AllTests {
 

apollo-client/src/test/java/com/ctrip/framework/apollo/integration/ConfigIntegrationTest.java

@@ -49,12 +49,14 @@ public class ConfigIntegrationTest extends BaseIntegrationTest {
   private String someReleaseKey;
   private File configDir;
   private String defaultNamespace;
+  private String someOtherNamespace;
 
   @Before
   public void setUp() throws Exception {
     super.setUp();
 
     defaultNamespace = ConfigConsts.NAMESPACE_APPLICATION;
+    someOtherNamespace = "someOtherNamespace";
     someReleaseKey = "1";
     configDir = new File(ClassLoaderUtil.getClassPath() + "config-cache");
     if (configDir.exists()) {
@@ -246,7 +248,9 @@ public class ConfigIntegrationTest extends BaseIntegrationTest {
     ContextHandler configHandler = mockConfigServerHandler(HttpServletResponse.SC_OK, apolloConfig);
     ContextHandler pollHandler =
         mockPollNotificationHandler(pollTimeoutInMS, HttpServletResponse.SC_OK,
-            new ApolloConfigNotification(apolloConfig.getNamespaceName(), someNotificationId), false);
+            Lists.newArrayList(
+                new ApolloConfigNotification(apolloConfig.getNamespaceName(), someNotificationId)),
+            false);
 
     startServerWithHandlers(configHandler, pollHandler);
 
@@ -267,14 +271,109 @@ public class ConfigIntegrationTest extends BaseIntegrationTest {
     longPollFinished.get(pollTimeoutInMS * 20, TimeUnit.MILLISECONDS);
 
     assertEquals(anotherValue, config.getProperty(someKey, null));
+  }
+
+  @Test
+  public void testLongPollRefreshWithMultipleNamespacesAndOnlyOneNamespaceNotified() throws Exception {
+    final String someKey = "someKey";
+    final String someValue = "someValue";
+    final String anotherValue = "anotherValue";
+    long someNotificationId = 1;
+
+    long pollTimeoutInMS = 50;
+    Map<String, String> configurations = Maps.newHashMap();
+    configurations.put(someKey, someValue);
+    ApolloConfig apolloConfig = assembleApolloConfig(configurations);
+    ContextHandler configHandler = mockConfigServerHandler(HttpServletResponse.SC_OK, apolloConfig);
+    ContextHandler pollHandler =
+        mockPollNotificationHandler(pollTimeoutInMS, HttpServletResponse.SC_OK,
+            Lists.newArrayList(
+                new ApolloConfigNotification(apolloConfig.getNamespaceName(), someNotificationId)),
+            false);
+
+    startServerWithHandlers(configHandler, pollHandler);
+
+    Config someOtherConfig = ConfigService.getConfig(someOtherNamespace);
+    Config config = ConfigService.getAppConfig();
+    assertEquals(someValue, config.getProperty(someKey, null));
+    assertEquals(someValue, someOtherConfig.getProperty(someKey, null));
+
+    final SettableFuture<Boolean> longPollFinished = SettableFuture.create();
+
+    config.addChangeListener(new ConfigChangeListener() {
+      @Override
+      public void onChange(ConfigChangeEvent changeEvent) {
+        longPollFinished.set(true);
+      }
+    });
+
+    apolloConfig.getConfigurations().put(someKey, anotherValue);
+
+    longPollFinished.get(pollTimeoutInMS * 50, TimeUnit.MILLISECONDS);
+
+    assertEquals(anotherValue, config.getProperty(someKey, null));
+
+    TimeUnit.MILLISECONDS.sleep(pollTimeoutInMS * 10);
+    assertEquals(someValue, someOtherConfig.getProperty(someKey, null));
+  }
+
+  @Test
+  public void testLongPollRefreshWithMultipleNamespacesAndMultipleNamespaceNotified() throws Exception {
+    final String someKey = "someKey";
+    final String someValue = "someValue";
+    final String anotherValue = "anotherValue";
+    long someNotificationId = 1;
+
+    long pollTimeoutInMS = 50;
+    Map<String, String> configurations = Maps.newHashMap();
+    configurations.put(someKey, someValue);
+    ApolloConfig apolloConfig = assembleApolloConfig(configurations);
+    ContextHandler configHandler = mockConfigServerHandler(HttpServletResponse.SC_OK, apolloConfig);
+    ContextHandler pollHandler =
+        mockPollNotificationHandler(pollTimeoutInMS, HttpServletResponse.SC_OK,
+            Lists.newArrayList(
+                new ApolloConfigNotification(apolloConfig.getNamespaceName(), someNotificationId),
+                new ApolloConfigNotification(someOtherNamespace, someNotificationId)),
+            false);
+
+    startServerWithHandlers(configHandler, pollHandler);
+
+    Config config = ConfigService.getAppConfig();
+    Config someOtherConfig = ConfigService.getConfig(someOtherNamespace);
+    assertEquals(someValue, config.getProperty(someKey, null));
+    assertEquals(someValue, someOtherConfig.getProperty(someKey, null));
+
+    final SettableFuture<Boolean> longPollFinished = SettableFuture.create();
+    final SettableFuture<Boolean> someOtherNamespacelongPollFinished = SettableFuture.create();
+
+    config.addChangeListener(new ConfigChangeListener() {
+      @Override
+      public void onChange(ConfigChangeEvent changeEvent) {
+        longPollFinished.set(true);
+      }
+    });
+    someOtherConfig.addChangeListener(new ConfigChangeListener() {
+      @Override
+      public void onChange(ConfigChangeEvent changeEvent) {
+        someOtherNamespacelongPollFinished.set(true);
+      }
+    });
+
+    apolloConfig.getConfigurations().put(someKey, anotherValue);
+
+    longPollFinished.get(pollTimeoutInMS * 20, TimeUnit.MILLISECONDS);
+    someOtherNamespacelongPollFinished.get(pollTimeoutInMS * 20, TimeUnit.MILLISECONDS);
+
+    assertEquals(anotherValue, config.getProperty(someKey, null));
+    assertEquals(anotherValue, someOtherConfig.getProperty(someKey, null));
 
   }
 
   private ContextHandler mockPollNotificationHandler(final long pollResultTimeOutInMS,
                                                      final int statusCode,
-                                                     final ApolloConfigNotification result,
+                                                     final List<ApolloConfigNotification> result,
                                                      final boolean failedAtFirstTime) {
-    ContextHandler context = new ContextHandler("/notifications");
+    ContextHandler context = new ContextHandler("/notifications/v2");
     context.setHandler(new AbstractHandler() {
       AtomicInteger counter = new AtomicInteger(0);
 

apollo-client/src/test/java/com/ctrip/framework/apollo/internals/RemoteConfigLongPollServiceTest.java

+package com.ctrip.framework.apollo.internals;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Lists;
+import com.google.common.util.concurrent.SettableFuture;
+
+import com.ctrip.framework.apollo.core.dto.ApolloConfigNotification;
+import com.ctrip.framework.apollo.core.dto.ServiceDTO;
+import com.ctrip.framework.apollo.util.ConfigUtil;
+import com.ctrip.framework.apollo.util.http.HttpRequest;
+import com.ctrip.framework.apollo.util.http.HttpResponse;
+import com.ctrip.framework.apollo.util.http.HttpUtil;
+
+import org.codehaus.plexus.personality.plexus.lifecycle.phase.InitializationException;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.invocation.InvocationOnMock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.mockito.stubbing.Answer;
+import org.springframework.test.util.ReflectionTestUtils;
+import org.unidal.lookup.ComponentTestCase;
+
+import java.lang.reflect.Type;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import javax.servlet.http.HttpServletResponse;
+
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * @author Jason Song(song_s@ctrip.com)
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class RemoteConfigLongPollServiceTest extends ComponentTestCase {
+  private RemoteConfigLongPollService remoteConfigLongPollService;
+  @Mock
+  private HttpResponse<List<ApolloConfigNotification>> pollResponse;
+  @Mock
+  private HttpUtil httpUtil;
+  private Type responseType;
+
+  private static String someServerUrl;
+  private static String someAppId;
+  private static String someCluster;
+
+  @Before
+  public void setUp() throws Exception {
+    super.setUp();
+
+    defineComponent(ConfigUtil.class, MockConfigUtil.class);
+    defineComponent(ConfigServiceLocator.class, MockConfigServiceLocator.class);
+
+    remoteConfigLongPollService = lookup(RemoteConfigLongPollService.class);
+
+    ReflectionTestUtils.setField(remoteConfigLongPollService, "m_httpUtil", httpUtil);
+    responseType =
+        (Type) ReflectionTestUtils.getField(remoteConfigLongPollService, "m_responseType");
+
+    someServerUrl = "http://someServer";
+    someAppId = "someAppId";
+    someCluster = "someCluster";
+  }
+
+  @Test
+  public void testSubmitLongPollNamespaceWith304Response() throws Exception {
+    RemoteConfigRepository someRepository = mock(RemoteConfigRepository.class);
+    final String someNamespace = "someNamespace";
+
+    when(pollResponse.getStatusCode()).thenReturn(HttpServletResponse.SC_NOT_MODIFIED);
+    final SettableFuture<Boolean> longPollFinished = SettableFuture.create();
+
+    doAnswer(new Answer<HttpResponse<List<ApolloConfigNotification>>>() {
+      @Override
+      public HttpResponse<List<ApolloConfigNotification>> answer(InvocationOnMock invocation)
+          throws Throwable {
+        try {
+          TimeUnit.MILLISECONDS.sleep(50);
+        } catch (InterruptedException e) {
+        }
+        HttpRequest request = invocation.getArgumentAt(0, HttpRequest.class);
+
+        assertTrue(request.getUrl().contains(someServerUrl + "/notifications/v2?"));
+        assertTrue(request.getUrl().contains("appId=" + someAppId));
+        assertTrue(request.getUrl().contains("cluster=" + someCluster));
+        assertTrue(request.getUrl().contains("notifications="));
+        assertTrue(request.getUrl().contains(someNamespace));
+
+        longPollFinished.set(true);
+        return pollResponse;
+      }
+    }).when(httpUtil).doGet(any(HttpRequest.class), eq(responseType));
+
+    remoteConfigLongPollService.submit(someNamespace, someRepository);
+
+    longPollFinished.get(5000, TimeUnit.MILLISECONDS);
+
+    remoteConfigLongPollService.stopLongPollingRefresh();
+
+    verify(someRepository, never()).onLongPollNotified(any(ServiceDTO.class));
+  }
+
+  @Test
+  public void testSubmitLongPollNamespaceWith200Response() throws Exception {
+    RemoteConfigRepository someRepository = mock(RemoteConfigRepository.class);
+    final String someNamespace = "someNamespace";
+
+    ApolloConfigNotification someNotification = mock(ApolloConfigNotification.class);
+    when(someNotification.getNamespaceName()).thenReturn(someNamespace);
+
+    when(pollResponse.getStatusCode()).thenReturn(HttpServletResponse.SC_OK);
+    when(pollResponse.getBody()).thenReturn(Lists.newArrayList(someNotification));
+
+    doAnswer(new Answer<HttpResponse<List<ApolloConfigNotification>>>() {
+      @Override
+      public HttpResponse<List<ApolloConfigNotification>> answer(InvocationOnMock invocation)
+          throws Throwable {
+        try {
+          TimeUnit.MILLISECONDS.sleep(50);
+        } catch (InterruptedException e) {
+        }
+
+        return pollResponse;
+      }
+    }).when(httpUtil).doGet(any(HttpRequest.class), eq(responseType));
+
+    final SettableFuture<Boolean> onNotified = SettableFuture.create();
+    doAnswer(new Answer<Void>() {
+      @Override
+      public Void answer(InvocationOnMock invocation) throws Throwable {
+        onNotified.set(true);
+        return null;
+      }
+    }).when(someRepository).onLongPollNotified(any(ServiceDTO.class));
+
+    remoteConfigLongPollService.submit(someNamespace, someRepository);
+
+    onNotified.get(5000, TimeUnit.MILLISECONDS);
+
+    remoteConfigLongPollService.stopLongPollingRefresh();
+
+    verify(someRepository, times(1)).onLongPollNotified(any(ServiceDTO.class));
+  }
+
+  @Test
+  public void testSubmitLongPollMultipleNamespaces() throws Exception {
+    RemoteConfigRepository someRepository = mock(RemoteConfigRepository.class);
+    RemoteConfigRepository anotherRepository = mock(RemoteConfigRepository.class);
+    final String someNamespace = "someNamespace";
+    final String anotherNamespace = "anotherNamespace";
+
+    final ApolloConfigNotification someNotification = mock(ApolloConfigNotification.class);
+    when(someNotification.getNamespaceName()).thenReturn(someNamespace);
+
+    final ApolloConfigNotification anotherNotification = mock(ApolloConfigNotification.class);
+    when(anotherNotification.getNamespaceName()).thenReturn(anotherNamespace);
+
+    final SettableFuture<Boolean> submitAnotherNamespaceStart = SettableFuture.create();
+    final SettableFuture<Boolean> submitAnotherNamespaceFinish = SettableFuture.create();
+
+    doAnswer(new Answer<HttpResponse<List<ApolloConfigNotification>>>() {
+      final AtomicInteger counter = new AtomicInteger();
+
+      @Override
+      public HttpResponse<List<ApolloConfigNotification>> answer(InvocationOnMock invocation)
+          throws Throwable {
+        try {
+          TimeUnit.MILLISECONDS.sleep(50);
+        } catch (InterruptedException e) {
+        }
+
+        //the first time
+        if (counter.incrementAndGet() == 1) {
+          HttpRequest request = invocation.getArgumentAt(0, HttpRequest.class);
+
+          assertTrue(request.getUrl().contains("notifications="));
+          assertTrue(request.getUrl().contains(someNamespace));
+
+          submitAnotherNamespaceStart.set(true);
+
+          when(pollResponse.getStatusCode()).thenReturn(HttpServletResponse.SC_OK);
+          when(pollResponse.getBody()).thenReturn(Lists.newArrayList(someNotification));
+        } else if (submitAnotherNamespaceFinish.get()) {
+          HttpRequest request = invocation.getArgumentAt(0, HttpRequest.class);
+          assertTrue(request.getUrl().contains("notifications="));
+          assertTrue(request.getUrl().contains(someNamespace));
+          assertTrue(request.getUrl().contains(anotherNamespace));
+
+          when(pollResponse.getStatusCode()).thenReturn(HttpServletResponse.SC_OK);
+          when(pollResponse.getBody()).thenReturn(Lists.newArrayList(anotherNotification));
+        } else {
+          when(pollResponse.getStatusCode()).thenReturn(HttpServletResponse.SC_NOT_MODIFIED);
+          when(pollResponse.getBody()).thenReturn(null);
+        }
+
+        return pollResponse;
+      }
+    }).when(httpUtil).doGet(any(HttpRequest.class), eq(responseType));
+
+    final SettableFuture<Boolean> onAnotherRepositoryNotified = SettableFuture.create();
+    doAnswer(new Answer<Void>() {
+      @Override
+      public Void answer(InvocationOnMock invocation) throws Throwable {
+        onAnotherRepositoryNotified.set(true);
+        return null;
+      }
+    }).when(anotherRepository).onLongPollNotified(any(ServiceDTO.class));
+
+    remoteConfigLongPollService.submit(someNamespace, someRepository);
+
+    submitAnotherNamespaceStart.get(5000, TimeUnit.MILLISECONDS);
+    remoteConfigLongPollService.submit(anotherNamespace, anotherRepository);
+    submitAnotherNamespaceFinish.set(true);
+
+    onAnotherRepositoryNotified.get(500, TimeUnit.MILLISECONDS);
+
+    remoteConfigLongPollService.stopLongPollingRefresh();
+
+    verify(someRepository, times(1)).onLongPollNotified(any(ServiceDTO.class));
+    verify(anotherRepository, times(1)).onLongPollNotified(any(ServiceDTO.class));
+  }
+
+  @Test
+  public void testSubmitLongPollMultipleNamespacesWithMultipleNotificationsReturned() throws Exception {
+    RemoteConfigRepository someRepository = mock(RemoteConfigRepository.class);
+    RemoteConfigRepository anotherRepository = mock(RemoteConfigRepository.class);
+    final String someNamespace = "someNamespace";
+    final String anotherNamespace = "anotherNamespace";
+
+    final ApolloConfigNotification someNotification = mock(ApolloConfigNotification.class);
+    when(someNotification.getNamespaceName()).thenReturn(someNamespace);
+
+    final ApolloConfigNotification anotherNotification = mock(ApolloConfigNotification.class);
+    when(anotherNotification.getNamespaceName()).thenReturn(anotherNamespace);
+
+    when(pollResponse.getStatusCode()).thenReturn(HttpServletResponse.SC_OK);
+    when(pollResponse.getBody()).thenReturn(Lists.newArrayList(someNotification, anotherNotification));
+
+    doAnswer(new Answer<HttpResponse<List<ApolloConfigNotification>>>() {
+      @Override
+      public HttpResponse<List<ApolloConfigNotification>> answer(InvocationOnMock invocation)
+          throws Throwable {
+        try {
+          TimeUnit.MILLISECONDS.sleep(50);
+        } catch (InterruptedException e) {
+        }
+
+        return pollResponse;
+      }
+    }).when(httpUtil).doGet(any(HttpRequest.class), eq(responseType));
+
+    final SettableFuture<Boolean> someRepositoryNotified = SettableFuture.create();
+    doAnswer(new Answer<Void>() {
+      @Override
+      public Void answer(InvocationOnMock invocation) throws Throwable {
+        someRepositoryNotified.set(true);
+        return null;
+      }
+    }).when(someRepository).onLongPollNotified(any(ServiceDTO.class));
+    final SettableFuture<Boolean> anotherRepositoryNotified = SettableFuture.create();
+    doAnswer(new Answer<Void>() {
+      @Override
+      public Void answer(InvocationOnMock invocation) throws Throwable {
+        anotherRepositoryNotified.set(true);
+        return null;
+      }
+    }).when(anotherRepository).onLongPollNotified(any(ServiceDTO.class));
+
+    remoteConfigLongPollService.submit(someNamespace, someRepository);
+    remoteConfigLongPollService.submit(anotherNamespace, anotherRepository);
+
+    someRepositoryNotified.get(5000, TimeUnit.MILLISECONDS);
+    anotherRepositoryNotified.get(5000, TimeUnit.MILLISECONDS);
+
+    remoteConfigLongPollService.stopLongPollingRefresh();
+
+    verify(someRepository, times(1)).onLongPollNotified(any(ServiceDTO.class));
+    verify(anotherRepository, times(1)).onLongPollNotified(any(ServiceDTO.class));
+  }
+
+  @Test
+  public void testAssembleLongPollRefreshUrl() throws Exception {
+    String someUri = someServerUrl;
+    String someAppId = "someAppId";
+    String someCluster = "someCluster+ &.-_someSign";
+    String someNamespace = "someName";
+    long someNotificationId = 1;
+    Map<String, Long> notificationsMap = ImmutableMap.of(someNamespace, someNotificationId);
+
+    String longPollRefreshUrl =
+        remoteConfigLongPollService
+            .assembleLongPollRefreshUrl(someUri, someAppId, someCluster, null, notificationsMap);
+
+    assertTrue(longPollRefreshUrl.contains(someServerUrl + "/notifications/v2?"));
+    assertTrue(longPollRefreshUrl.contains("appId=" + someAppId));
+    assertTrue(longPollRefreshUrl.contains("cluster=someCluster%2B+%26.-_someSign"));
+    assertTrue(longPollRefreshUrl.contains(
+        "notifications=%5B%7B%22namespaceName%22%3A%22" + someNamespace
+            + "%22%2C%22notificationId%22%3A" + 1 + "%7D%5D"));
+  }
+
+  @Test
+  public void testAssembleLongPollRefreshUrlWithMultipleNamespaces() throws Exception {
+    String someUri = someServerUrl;
+    String someAppId = "someAppId";
+    String someCluster = "someCluster+ &.-_someSign";
+    String someNamespace = "someName";
+    String anotherNamespace = "anotherName";
+    long someNotificationId = 1;
+    long anotherNotificationId = 2;
+    Map<String, Long> notificationsMap =
+        ImmutableMap.of(someNamespace, someNotificationId, anotherNamespace, anotherNotificationId);
+
+    String longPollRefreshUrl =
+        remoteConfigLongPollService
+            .assembleLongPollRefreshUrl(someUri, someAppId, someCluster, null, notificationsMap);
+
+    assertTrue(longPollRefreshUrl.contains(someServerUrl + "/notifications/v2?"));
+    assertTrue(longPollRefreshUrl.contains("appId=" + someAppId));
+    assertTrue(longPollRefreshUrl.contains("cluster=someCluster%2B+%26.-_someSign"));
+    assertTrue(
+        longPollRefreshUrl.contains("notifications=%5B%7B%22namespaceName%22%3A%22" + someNamespace
+            + "%22%2C%22notificationId%22%3A" + someNotificationId
+            + "%7D%2C%7B%22namespaceName%22%3A%22" + anotherNamespace
+            + "%22%2C%22notificationId%22%3A" + anotherNotificationId + "%7D%5D"));
+  }
+
+  public static class MockConfigUtil extends ConfigUtil {
+    @Override
+    public String getAppId() {
+      return someAppId;
+    }
+
+    @Override
+    public String getCluster() {
+      return someCluster;
+    }
+
+    @Override
+    public String getDataCenter() {
+      return null;
+    }
+
+    @Override
+    public int getLoadConfigQPS() {
+      return 200;
+    }
+
+    @Override
+    public int getLongPollQPS() {
+      return 200;
+    }
+  }
+
+  public static class MockConfigServiceLocator extends ConfigServiceLocator {
+    @Override
+    public List<ServiceDTO> getConfigServices() {
+      ServiceDTO serviceDTO = mock(ServiceDTO.class);
+
+      when(serviceDTO.getHomepageUrl()).thenReturn(someServerUrl);
+      return Lists.newArrayList(serviceDTO);
+    }
+
+    @Override
+    public void initialize() throws InitializationException {
+      //do nothing
+    }
+  }
+}

apollo-client/src/test/java/com/ctrip/framework/apollo/internals/RemoteConfigRepositoryTest.java

@@ -4,6 +4,7 @@ import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.util.concurrent.SettableFuture;
+
 import com.ctrip.framework.apollo.core.dto.ApolloConfig;
 import com.ctrip.framework.apollo.core.dto.ApolloConfigNotification;
 import com.ctrip.framework.apollo.core.dto.ServiceDTO;
@@ -24,6 +25,7 @@ import org.mockito.runners.MockitoJUnitRunner;
 import org.mockito.stubbing.Answer;
 import org.unidal.lookup.ComponentTestCase;
 
+import java.lang.reflect.Type;
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
@@ -34,12 +36,12 @@ import javax.servlet.http.HttpServletResponse;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
-import static org.mockito.Mockito.any;
-import static org.mockito.Mockito.doAnswer;
 
 /**
  * Created by Jason on 4/9/16.
@@ -52,9 +54,8 @@ public class RemoteConfigRepositoryTest extends ComponentTestCase {
   @Mock
   private static HttpResponse<ApolloConfig> someResponse;
   @Mock
-  private static HttpResponse<ApolloConfigNotification> pollResponse;
-  @Mock
-  private ConfigUtil someConfigUtil;
+  private static HttpResponse<List<ApolloConfigNotification>> pollResponse;
+  private RemoteConfigLongPollService remoteConfigLongPollService;
 
   @Before
   public void setUp() throws Exception {
@@ -66,6 +67,8 @@ public class RemoteConfigRepositoryTest extends ComponentTestCase {
     defineComponent(ConfigUtil.class, MockConfigUtil.class);
     defineComponent(ConfigServiceLocator.class, MockConfigServiceLocator.class);
     defineComponent(HttpUtil.class, MockHttpUtil.class);
+
+    remoteConfigLongPollService = lookup(RemoteConfigLongPollService.class);
   }
 
   @Test
@@ -84,7 +87,7 @@ public class RemoteConfigRepositoryTest extends ComponentTestCase {
     Properties config = remoteConfigRepository.getConfig();
 
     assertEquals(configurations, config);
-    remoteConfigRepository.stopLongPollingRefresh();
+    remoteConfigLongPollService.stopLongPollingRefresh();
   }
 
   @Test(expected = ApolloConfigException.class)
@@ -95,7 +98,7 @@ public class RemoteConfigRepositoryTest extends ComponentTestCase {
     RemoteConfigRepository remoteConfigRepository = new RemoteConfigRepository(someNamespace);
 
     //must stop the long polling before exception occurred
-    remoteConfigRepository.stopLongPollingRefresh();
+    remoteConfigLongPollService.stopLongPollingRefresh();
 
     remoteConfigRepository.getConfig();
   }
@@ -124,7 +127,7 @@ public class RemoteConfigRepositoryTest extends ComponentTestCase {
 
     assertEquals(newConfigurations, captor.getValue());
 
-    remoteConfigRepository.stopLongPollingRefresh();
+    remoteConfigLongPollService.stopLongPollingRefresh();
   }
 
   @Test
@@ -137,7 +140,7 @@ public class RemoteConfigRepositoryTest extends ComponentTestCase {
 
     final SettableFuture<Boolean> longPollFinished = SettableFuture.create();
     RepositoryChangeListener someListener = mock(RepositoryChangeListener.class);
-    doAnswer(new Answer<Void>(){
+    doAnswer(new Answer<Void>() {
 
       @Override
       public Void answer(InvocationOnMock invocation) throws Throwable {
@@ -153,37 +156,21 @@ public class RemoteConfigRepositoryTest extends ComponentTestCase {
 
     Map<String, String> newConfigurations = ImmutableMap.of("someKey", "anotherValue");
     ApolloConfig newApolloConfig = assembleApolloConfig(newConfigurations);
-
+    ApolloConfigNotification someNotification = mock(ApolloConfigNotification.class);
+    when(someNotification.getNamespaceName()).thenReturn(someNamespace);
 
     when(pollResponse.getStatusCode()).thenReturn(HttpServletResponse.SC_OK);
+    when(pollResponse.getBody()).thenReturn(Lists.newArrayList(someNotification));
     when(someResponse.getBody()).thenReturn(newApolloConfig);
 
     longPollFinished.get(500, TimeUnit.MILLISECONDS);
 
-    remoteConfigRepository.stopLongPollingRefresh();
+    remoteConfigLongPollService.stopLongPollingRefresh();
 
     verify(someListener, times(1)).onRepositoryChange(eq(someNamespace), captor.capture());
     assertEquals(newConfigurations, captor.getValue());
   }
 
-  @Test
-  public void testAssembleLongPollRefreshUrl() throws Exception {
-    String someUri = "http://someServer";
-    String someAppId = "someAppId";
-    String someCluster = "someCluster+ &.-_someSign";
-
-    RemoteConfigRepository remoteConfigRepository = new RemoteConfigRepository(someNamespace);
-
-    String longPollRefreshUrl =
-        remoteConfigRepository
-            .assembleLongPollRefreshUrl(someUri, someAppId, someCluster, someNamespace, null, null);
-
-    assertTrue(longPollRefreshUrl.contains("http://someServer/notifications?"));
-    assertTrue(longPollRefreshUrl.contains("appId=someAppId"));
-    assertTrue(longPollRefreshUrl.contains("cluster=someCluster%2B+%26.-_someSign"));
-    assertTrue(longPollRefreshUrl.contains("namespace=" + someNamespace));
-  }
-
   @Test
   public void testAssembleQueryConfigUrl() throws Exception {
     String someUri = "http://someServer";
@@ -200,7 +187,8 @@ public class RemoteConfigRepositoryTest extends ComponentTestCase {
             someApolloConfig);
 
     assertTrue(queryConfigUrl
-        .contains("http://someServer/configs/someAppId/someCluster+%20&.-_someSign/" + someNamespace));
+        .contains(
+            "http://someServer/configs/someAppId/someCluster+%20&.-_someSign/" + someNamespace));
     assertTrue(queryConfigUrl
         .contains("releaseKey=20160705193346-583078ef5716c055%2B20160705193308-31c471ddf9087c3f"));
 
@@ -265,15 +253,17 @@ public class RemoteConfigRepositoryTest extends ComponentTestCase {
   public static class MockHttpUtil extends HttpUtil {
     @Override
     public <T> HttpResponse<T> doGet(HttpRequest httpRequest, Class<T> responseType) {
-      if (httpRequest.getUrl().contains("notifications?")) {
+      return (HttpResponse<T>) someResponse;
+    }
+
+    @Override
+    public <T> HttpResponse<T> doGet(HttpRequest httpRequest, Type responseType) {
       try {
         TimeUnit.MILLISECONDS.sleep(50);
       } catch (InterruptedException e) {
       }
       return (HttpResponse<T>) pollResponse;
     }
-      return (HttpResponse<T>) someResponse;
-    }
   }
 
 }

apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/ConfigServiceAutoConfiguration.java

@@ -3,6 +3,7 @@ package com.ctrip.framework.apollo.configservice;
 import com.ctrip.framework.apollo.biz.message.ReleaseMessageScanner;
 import com.ctrip.framework.apollo.configservice.controller.ConfigFileController;
 import com.ctrip.framework.apollo.configservice.controller.NotificationController;
+import com.ctrip.framework.apollo.configservice.controller.NotificationControllerV2;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
@@ -17,12 +18,15 @@ public class ConfigServiceAutoConfiguration {
   private NotificationController notificationController;
   @Autowired
   private ConfigFileController configFileController;
+  @Autowired
+  private NotificationControllerV2 notificationControllerV2;
 
   @Bean
   public ReleaseMessageScanner releaseMessageScanner() {
     ReleaseMessageScanner releaseMessageScanner = new ReleaseMessageScanner();
     //handle server cache first
     releaseMessageScanner.addMessageListener(configFileController);
+    releaseMessageScanner.addMessageListener(notificationControllerV2);
     releaseMessageScanner.addMessageListener(notificationController);
     return releaseMessageScanner;
   }

apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/controller/NotificationController.java

@@ -59,6 +59,17 @@ public class NotificationController implements ReleaseMessageListener {
   @Autowired
   private NamespaceUtil namespaceUtil;
 
+  /**
+   * For single namespace notification, reserved for older version of apollo clients
+   *
+   * @param appId          the appId
+   * @param cluster        the cluster
+   * @param namespace      the namespace name
+   * @param dataCenter     the datacenter
+   * @param notificationId the notification id for the namespace
+   * @param clientIp       the client side ip
+   * @return a deferred result
+   */
   @RequestMapping(method = RequestMethod.GET)
   public DeferredResult<ResponseEntity<ApolloConfigNotification>> pollNotification(
       @RequestParam(value = "appId") String appId,

apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/controller/NotificationControllerV2.java

+package com.ctrip.framework.apollo.configservice.controller;
+
+import com.google.common.base.Function;
+import com.google.common.base.Splitter;
+import com.google.common.base.Strings;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.Multimaps;
+import com.google.common.collect.Sets;
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+
+import com.ctrip.framework.apollo.biz.entity.ReleaseMessage;
+import com.ctrip.framework.apollo.biz.message.ReleaseMessageListener;
+import com.ctrip.framework.apollo.biz.message.Topics;
+import com.ctrip.framework.apollo.biz.service.ReleaseMessageService;
+import com.ctrip.framework.apollo.biz.utils.EntityManagerUtil;
+import com.ctrip.framework.apollo.configservice.util.NamespaceUtil;
+import com.ctrip.framework.apollo.configservice.util.WatchKeysUtil;
+import com.ctrip.framework.apollo.core.ConfigConsts;
+import com.ctrip.framework.apollo.core.dto.ApolloConfigNotification;
+import com.ctrip.framework.apollo.core.exception.BadRequestException;
+import com.dianping.cat.Cat;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.util.CollectionUtils;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.context.request.async.DeferredResult;
+
+import java.lang.reflect.Type;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * @author Jason Song(song_s@ctrip.com)
+ */
+@RestController
+@RequestMapping("/notifications/v2")
+public class NotificationControllerV2 implements ReleaseMessageListener {
+  private static final Logger logger = LoggerFactory.getLogger(NotificationControllerV2.class);
+  private static final long TIMEOUT = 30 * 1000;//30 seconds
+  private final Multimap<String, DeferredResult<ResponseEntity<List<ApolloConfigNotification>>>>
+      deferredResults = Multimaps.synchronizedSetMultimap(HashMultimap.create());
+  private static final ResponseEntity<List<ApolloConfigNotification>>
+      NOT_MODIFIED_RESPONSE_LIST = new ResponseEntity<>(HttpStatus.NOT_MODIFIED);
+  private static final Splitter STRING_SPLITTER =
+      Splitter.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR).omitEmptyStrings();
+  private static final long NOTIFICATION_ID_PLACEHOLDER = -1;
+  private static final Type notificationsTypeReference =
+      new TypeToken<List<ApolloConfigNotification>>() {
+      }.getType();
+
+  @Autowired
+  private WatchKeysUtil watchKeysUtil;
+
+  @Autowired
+  private ReleaseMessageService releaseMessageService;
+
+  @Autowired
+  private EntityManagerUtil entityManagerUtil;
+
+  @Autowired
+  private NamespaceUtil namespaceUtil;
+
+  @Autowired
+  private Gson gson;
+
+  @RequestMapping(method = RequestMethod.GET)
+  public DeferredResult<ResponseEntity<List<ApolloConfigNotification>>> pollNotification(
+      @RequestParam(value = "appId") String appId,
+      @RequestParam(value = "cluster") String cluster,
+      @RequestParam(value = "notifications") String notificationsAsString,
+      @RequestParam(value = "dataCenter", required = false) String dataCenter,
+      @RequestParam(value = "ip", required = false) String clientIp) {
+    List<ApolloConfigNotification> notifications = null;
+
+    try {
+      notifications =
+          gson.fromJson(notificationsAsString, notificationsTypeReference);
+    } catch (Throwable ex) {
+      Cat.logError(ex);
+    }
+
+    if (CollectionUtils.isEmpty(notifications)) {
+      throw new BadRequestException("Invalid format of notifications: " + notificationsAsString);
+    }
+
+    Set<String> namespaces = Sets.newHashSet();
+    Map<String, Long> clientSideNotifications = Maps.newHashMap();
+    for (ApolloConfigNotification notification : notifications) {
+      if (Strings.isNullOrEmpty(notification.getNamespaceName())) {
+        continue;
+      }
+      //strip out .properties suffix
+      String namespace = namespaceUtil.filterNamespaceName(notification.getNamespaceName());
+      namespaces.add(namespace);
+      clientSideNotifications.put(namespace, notification.getNotificationId());
+    }
+
+    Multimap<String, String> watchedKeysMap =
+        watchKeysUtil.assembleAllWatchKeys(appId, cluster, namespaces, dataCenter);
+
+    DeferredResult<ResponseEntity<List<ApolloConfigNotification>>> deferredResult =
+        new DeferredResult<>(TIMEOUT, NOT_MODIFIED_RESPONSE_LIST);
+
+    Set<String> watchedKeys = Sets.newHashSet(watchedKeysMap.values());
+
+    List<ReleaseMessage> latestReleaseMessages =
+        releaseMessageService.findLatestReleaseMessagesGroupByMessages(watchedKeys);
+
+    /**
+     * Manually close the entity manager.
+     * Since for async request, Spring won't do so until the request is finished,
+     * which is unacceptable since we are doing long polling - means the db connection would be hold
+     * for a very long time
+     */
+    entityManagerUtil.closeEntityManager();
+
+    List<ApolloConfigNotification> newNotifications =
+        getApolloConfigNotifications(namespaces, clientSideNotifications, watchedKeysMap,
+            latestReleaseMessages);
+
+    if (!CollectionUtils.isEmpty(newNotifications)) {
+      deferredResult.setResult(new ResponseEntity<>(newNotifications, HttpStatus.OK));
+    } else {
+      //register all keys
+      for (String key : watchedKeys) {
+        this.deferredResults.put(key, deferredResult);
+      }
+
+      deferredResult
+          .onTimeout(() -> logWatchedKeysToCat(watchedKeys, "Apollo.LongPoll.TimeOutKeys"));
+
+      deferredResult.onCompletion(() -> {
+        //unregister all keys
+        for (String key : watchedKeys) {
+          deferredResults.remove(key, deferredResult);
+        }
+        logWatchedKeysToCat(watchedKeys, "Apollo.LongPoll.CompletedKeys");
+      });
+
+      logWatchedKeysToCat(watchedKeys, "Apollo.LongPoll.RegisteredKeys");
+      logger.debug("Listening {} from appId: {}, cluster: {}, namespace: {}, datacenter: {}",
+          watchedKeys, appId, cluster, namespaces, dataCenter);
+    }
+
+    return deferredResult;
+  }
+
+  private List<ApolloConfigNotification> getApolloConfigNotifications(Set<String> namespaces,
+                                                                      Map<String, Long> clientSideNotifications,
+                                                                      Multimap<String, String> watchedKeysMap,
+                                                                      List<ReleaseMessage> latestReleaseMessages) {
+    List<ApolloConfigNotification> newNotifications = Lists.newArrayList();
+    if (!CollectionUtils.isEmpty(latestReleaseMessages)) {
+      Map<String, Long> latestNotifications = Maps.newHashMap();
+      for (ReleaseMessage releaseMessage : latestReleaseMessages) {
+        latestNotifications.put(releaseMessage.getMessage(), releaseMessage.getId());
+      }
+
+      for (String namespace : namespaces) {
+        long clientSideId = clientSideNotifications.get(namespace);
+        long latestId = NOTIFICATION_ID_PLACEHOLDER;
+        Collection<String> namespaceWatchedKeys = watchedKeysMap.get(namespace);
+        for (String namespaceWatchedKey : namespaceWatchedKeys) {
+          long namespaceNotificationId =
+              latestNotifications.getOrDefault(namespaceWatchedKey, NOTIFICATION_ID_PLACEHOLDER);
+          if (namespaceNotificationId > latestId) {
+            latestId = namespaceNotificationId;
+          }
+        }
+        if (latestId > clientSideId) {
+          newNotifications.add(new ApolloConfigNotification(namespace, latestId));
+        }
+      }
+    }
+    return newNotifications;
+  }
+
+  @Override
+  public void handleMessage(ReleaseMessage message, String channel) {
+    logger.info("message received - channel: {}, message: {}", channel, message);
+
+    String content = message.getMessage();
+    Cat.logEvent("Apollo.LongPoll.Messages", content);
+    if (!Topics.APOLLO_RELEASE_TOPIC.equals(channel) || Strings.isNullOrEmpty(content)) {
+      return;
+    }
+
+    String changedNamespace = retrieveNamespaceFromReleaseMessage.apply(content);
+
+    if (Strings.isNullOrEmpty(changedNamespace)) {
+      logger.error("message format invalid - {}", content);
+      return;
+    }
+
+    ResponseEntity<List<ApolloConfigNotification>> notification =
+        new ResponseEntity<>(
+            Lists.newArrayList(new ApolloConfigNotification(changedNamespace, message.getId())),
+            HttpStatus.OK);
+
+    if (!deferredResults.containsKey(content)) {
+      return;
+    }
+    //create a new list to avoid ConcurrentModificationException
+    List<DeferredResult<ResponseEntity<List<ApolloConfigNotification>>>> results =
+        Lists.newArrayList(deferredResults.get(content));
+    logger.debug("Notify {} clients for key {}", results.size(), content);
+
+    for (DeferredResult<ResponseEntity<List<ApolloConfigNotification>>> result : results) {
+      result.setResult(notification);
+    }
+    logger.debug("Notification completed");
+  }
+
+  private static final Function<String, String> retrieveNamespaceFromReleaseMessage =
+      releaseMessage -> {
+        if (Strings.isNullOrEmpty(releaseMessage)) {
+          return null;
+        }
+        List<String> keys = STRING_SPLITTER.splitToList(releaseMessage);
+        //message should be appId+cluster+namespace
+        if (keys.size() != 3) {
+          logger.error("message format invalid - {}", releaseMessage);
+          return null;
+        }
+        return keys.get(2);
+      };
+
+  private void logWatchedKeysToCat(Set<String> watchedKeys, String eventName) {
+    for (String watchedKey : watchedKeys) {
+      Cat.logEvent(eventName, watchedKey);
+    }
+  }
+}
+

apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/util/WatchKeysUtil.java

@@ -2,6 +2,9 @@ package com.ctrip.framework.apollo.configservice.util;
 
 import com.google.common.base.Joiner;
 import com.google.common.base.Strings;
+import com.google.common.collect.FluentIterable;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.Multimap;
 import com.google.common.collect.Sets;
 
 import com.ctrip.framework.apollo.biz.service.AppNamespaceService;
@@ -11,6 +14,8 @@ import com.ctrip.framework.apollo.core.ConfigConsts;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
+import java.util.Collections;
+import java.util.List;
 import java.util.Objects;
 import java.util.Set;
 
@@ -23,32 +28,61 @@ public class WatchKeysUtil {
   @Autowired
   private AppNamespaceService appNamespaceService;
 
+  /**
+   * Assemble watch keys for the given appId, cluster, namespace, dataCenter combination
+   */
   public Set<String> assembleAllWatchKeys(String appId, String clusterName, String namespace,
                                           String dataCenter) {
-    Set<String> watchedKeys = assembleWatchKeys(appId, clusterName, namespace, dataCenter);
+    Multimap<String, String> watchedKeysMap =
+        assembleAllWatchKeys(appId, clusterName, Sets.newHashSet(namespace), dataCenter);
+    return Sets.newHashSet(watchedKeysMap.get(namespace));
+  }
+
+  /**
+   * Assemble watch keys for the given appId, cluster, namespaces, dataCenter combination
+   * @return a multimap with namespace as the key and watch keys as the value
+   */
+  public Multimap<String, String> assembleAllWatchKeys(String appId, String clusterName,
+                                                       Set<String> namespaces,
+                                                       String dataCenter) {
+    Multimap<String, String> watchedKeysMap =
+        assembleWatchKeys(appId, clusterName, namespaces, dataCenter);
+
+    //Every app has an 'application' namespace
+    if (!(namespaces.size() == 1 && namespaces.contains(ConfigConsts.NAMESPACE_APPLICATION))) {
+      Set<String> namespacesBelongToAppId = namespacesBelongToAppId(appId, namespaces);
+      Set<String> publicNamespaces = Sets.difference(namespaces, namespacesBelongToAppId);
 
       //Listen on more namespaces if it's a public namespace
-    if (!namespaceBelongsToAppId(appId, namespace)) {
-      watchedKeys.addAll(this.findPublicConfigWatchKey(appId, clusterName, namespace, dataCenter));
+      if (!publicNamespaces.isEmpty()) {
+        watchedKeysMap
+            .putAll(findPublicConfigWatchKeys(appId, clusterName, publicNamespaces, dataCenter));
+      }
     }
 
-    return watchedKeys;
-
+    return watchedKeysMap;
   }
 
-  private Set<String> findPublicConfigWatchKey(String applicationId, String clusterName,
-                                               String namespace,
+  private Multimap<String, String> findPublicConfigWatchKeys(String applicationId,
+                                                             String clusterName,
+                                                             Set<String> namespaces,
                                                              String dataCenter) {
-    AppNamespace appNamespace = appNamespaceService.findPublicNamespaceByName(namespace);
+    Multimap<String, String> watchedKeysMap = HashMultimap.create();
+    List<AppNamespace> appNamespaces = appNamespaceService.findPublicNamespacesByNames(namespaces);
 
+    for (AppNamespace appNamespace : appNamespaces) {
       //check whether the namespace's appId equals to current one
-    if (Objects.isNull(appNamespace) || Objects.equals(applicationId, appNamespace.getAppId())) {
-      return Sets.newHashSet();
+      if (Objects.equals(applicationId, appNamespace.getAppId())) {
+        continue;
       }
 
       String publicConfigAppId = appNamespace.getAppId();
 
-    return assembleWatchKeys(publicConfigAppId, clusterName, namespace, dataCenter);
+      watchedKeysMap.putAll(appNamespace.getName(),
+          assembleWatchKeys(publicConfigAppId, clusterName, appNamespace.getName(), dataCenter));
+    }
+
+    return watchedKeysMap;
   }
 
   private String assembleKey(String appId, String cluster, String namespace) {
@@ -57,6 +91,7 @@ public class WatchKeysUtil {
 
   private Set<String> assembleWatchKeys(String appId, String clusterName, String namespace,
                                         String dataCenter) {
+
     Set<String> watchedKeys = Sets.newHashSet();
 
     //watch specified cluster config change
@@ -75,14 +110,27 @@ public class WatchKeysUtil {
     return watchedKeys;
   }
 
-  private boolean namespaceBelongsToAppId(String appId, String namespaceName) {
-    //Every app has an 'application' namespace
-    if (Objects.equals(ConfigConsts.NAMESPACE_APPLICATION, namespaceName)) {
-      return true;
+  private Multimap<String, String> assembleWatchKeys(String appId, String clusterName,
+                                                     Set<String> namespaces,
+                                                     String dataCenter) {
+    Multimap<String, String> watchedKeysMap = HashMultimap.create();
+
+    for (String namespace : namespaces) {
+      watchedKeysMap
+          .putAll(namespace, assembleWatchKeys(appId, clusterName, namespace, dataCenter));
+    }
+
+    return watchedKeysMap;
   }
 
-    AppNamespace appNamespace = appNamespaceService.findOne(appId, namespaceName);
+  private Set<String> namespacesBelongToAppId(String appId, Set<String> namespaces) {
+    List<AppNamespace> appNamespaces =
+        appNamespaceService.findByAppIdAndNamespaces(appId, namespaces);
+
+    if (appNamespaces == null || appNamespaces.isEmpty()) {
+      return Collections.emptySet();
+    }
 
-    return appNamespace != null;
+    return FluentIterable.from(appNamespaces).transform(AppNamespace::getName).toSet();
   }
 }

apollo-configservice/src/test/java/com/ctrip/framework/apollo/configservice/AllTests.java

@@ -3,10 +3,13 @@ package com.ctrip.framework.apollo.configservice;
 import com.ctrip.framework.apollo.configservice.controller.ConfigControllerTest;
 import com.ctrip.framework.apollo.configservice.controller.ConfigFileControllerTest;
 import com.ctrip.framework.apollo.configservice.controller.NotificationControllerTest;
+import com.ctrip.framework.apollo.configservice.controller.NotificationControllerV2Test;
 import com.ctrip.framework.apollo.configservice.integration.ConfigControllerIntegrationTest;
 import com.ctrip.framework.apollo.configservice.integration.ConfigFileControllerIntegrationTest;
 import com.ctrip.framework.apollo.configservice.integration.NotificationControllerIntegrationTest;
+import com.ctrip.framework.apollo.configservice.integration.NotificationControllerV2IntegrationTest;
 import com.ctrip.framework.apollo.configservice.util.NamespaceUtilTest;
+import com.ctrip.framework.apollo.configservice.util.WatchKeysUtilTest;
 
 import org.junit.runner.RunWith;
 import org.junit.runners.Suite;
@@ -16,7 +19,9 @@ import org.junit.runners.Suite.SuiteClasses;
 @SuiteClasses({ConfigControllerTest.class, NotificationControllerTest.class,
     ConfigControllerIntegrationTest.class, NotificationControllerIntegrationTest.class,
     NamespaceUtilTest.class, ConfigFileControllerTest.class,
-    ConfigFileControllerIntegrationTest.class})
+    ConfigFileControllerIntegrationTest.class, WatchKeysUtilTest.class,
+    NotificationControllerV2Test.class, NotificationControllerV2IntegrationTest.class
+})
 public class AllTests {
 
 }

apollo-configservice/src/test/java/com/ctrip/framework/apollo/configservice/controller/NotificationControllerTest.java

 package com.ctrip.framework.apollo.configservice.controller;
 
 import com.google.common.base.Joiner;
-import com.google.common.collect.Lists;
 import com.google.common.collect.Multimap;
+import com.google.common.collect.Sets;
 
 import com.ctrip.framework.apollo.biz.entity.ReleaseMessage;
 import com.ctrip.framework.apollo.biz.message.Topics;
-import com.ctrip.framework.apollo.biz.service.AppNamespaceService;
 import com.ctrip.framework.apollo.biz.service.ReleaseMessageService;
 import com.ctrip.framework.apollo.biz.utils.EntityManagerUtil;
-import com.ctrip.framework.apollo.common.entity.AppNamespace;
 import com.ctrip.framework.apollo.configservice.util.NamespaceUtil;
 import com.ctrip.framework.apollo.configservice.util.WatchKeysUtil;
 import com.ctrip.framework.apollo.core.ConfigConsts;
@@ -25,12 +23,13 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.web.context.request.async.DeferredResult;
 
-import java.util.List;
+import java.util.Set;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
-import static org.mockito.Matchers.anyCollectionOf;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 /**
@@ -48,13 +47,13 @@ public class NotificationControllerTest {
   private long someNotificationId;
   private String someClientIp;
   @Mock
-  private AppNamespaceService appNamespaceService;
-  @Mock
   private ReleaseMessageService releaseMessageService;
   @Mock
   private EntityManagerUtil entityManagerUtil;
   @Mock
   private NamespaceUtil namespaceUtil;
+  @Mock
+  private WatchKeysUtil watchKeysUtil;
 
   private Multimap<String, DeferredResult<ResponseEntity<ApolloConfigNotification>>>
       deferredResults;
@@ -65,11 +64,8 @@ public class NotificationControllerTest {
     ReflectionTestUtils.setField(controller, "releaseMessageService", releaseMessageService);
     ReflectionTestUtils.setField(controller, "entityManagerUtil", entityManagerUtil);
     ReflectionTestUtils.setField(controller, "namespaceUtil", namespaceUtil);
-    WatchKeysUtil watchKeysUtil = new WatchKeysUtil();
-    ReflectionTestUtils.setField(watchKeysUtil, "appNamespaceService", appNamespaceService);
     ReflectionTestUtils.setField(controller, "watchKeysUtil", watchKeysUtil);
 
-
     someAppId = "someAppId";
     someCluster = "someCluster";
     defaultCluster = ConfigConsts.CLUSTER_NAME_DEFAULT;
@@ -89,21 +85,25 @@ public class NotificationControllerTest {
 
   @Test
   public void testPollNotificationWithDefaultNamespace() throws Exception {
+    String someWatchKey = "someKey";
+    String anotherWatchKey = "anotherKey";
+
+    Set<String> watchKeys = Sets.newHashSet(someWatchKey, anotherWatchKey);
+
+    when(watchKeysUtil
+        .assembleAllWatchKeys(someAppId, someCluster, defaultNamespace,
+            someDataCenter)).thenReturn(
+        watchKeys);
+
     DeferredResult<ResponseEntity<ApolloConfigNotification>>
         deferredResult = controller
         .pollNotification(someAppId, someCluster, defaultNamespace, someDataCenter,
             someNotificationId, someClientIp);
 
-    List<String> clusters =
-        Lists.newArrayList(someCluster, someDataCenter, ConfigConsts.CLUSTER_NAME_DEFAULT);
-
-    assertEquals(clusters.size(), deferredResults.size());
+    assertEquals(watchKeys.size(), deferredResults.size());
 
-    for (String cluster : clusters) {
-      String key =
-          Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
-              .join(someAppId, cluster, defaultNamespace);
-      assertTrue(deferredResults.get(key).contains(deferredResult));
+    for (String watchKey : watchKeys) {
+      assertTrue(deferredResults.get(watchKey).contains(deferredResult));
     }
   }
 
@@ -112,260 +112,109 @@ public class NotificationControllerTest {
     String namespace = String.format("%s.%s", defaultNamespace, "properties");
     when(namespaceUtil.filterNamespaceName(namespace)).thenReturn(defaultNamespace);
 
-    DeferredResult<ResponseEntity<ApolloConfigNotification>>
-        deferredResult = controller
-        .pollNotification(someAppId, someCluster, namespace, someDataCenter,
-            someNotificationId, someClientIp);
-
-    List<String> clusters =
-        Lists.newArrayList(someCluster, someDataCenter, ConfigConsts.CLUSTER_NAME_DEFAULT);
-
-    assertEquals(clusters.size(), deferredResults.size());
-
-    for (String cluster : clusters) {
-      String key =
-          Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
-              .join(someAppId, cluster, defaultNamespace);
-      assertTrue(deferredResults.get(key).contains(deferredResult));
-    }
-  }
+    String someWatchKey = "someKey";
+    String anotherWatchKey = "anotherKey";
 
-  @Test
-  public void testPollNotificationWithPrivateNamespaceAsFile() throws Exception {
-    String namespace = String.format("someNamespace.xml");
-    AppNamespace appNamespace = mock(AppNamespace.class);
+    Set<String> watchKeys = Sets.newHashSet(someWatchKey, anotherWatchKey);
 
-    when(namespaceUtil.filterNamespaceName(namespace)).thenReturn(namespace);
-    when(appNamespaceService.findOne(someAppId, namespace)).thenReturn(appNamespace);
+    when(watchKeysUtil
+        .assembleAllWatchKeys(someAppId, someCluster, defaultNamespace,
+            someDataCenter)).thenReturn(
+        watchKeys);
 
     DeferredResult<ResponseEntity<ApolloConfigNotification>>
         deferredResult = controller
         .pollNotification(someAppId, someCluster, namespace, someDataCenter,
             someNotificationId, someClientIp);
 
-    List<String> clusters =
-        Lists.newArrayList(someCluster, someDataCenter, ConfigConsts.CLUSTER_NAME_DEFAULT);
-
-    assertEquals(clusters.size(), deferredResults.size());
+    assertEquals(watchKeys.size(), deferredResults.size());
 
-    for (String cluster : clusters) {
-      String key =
-          Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
-              .join(someAppId, cluster, namespace);
-      assertTrue(deferredResults.get(key).contains(deferredResult));
+    for (String watchKey : watchKeys) {
+      assertTrue(deferredResults.get(watchKey).contains(deferredResult));
     }
   }
 
   @Test
-  public void testPollNotificationWithDefaultNamespaceWithNotificationIdOutDated() throws Exception {
-    long notificationId = someNotificationId + 1;
-    ReleaseMessage someReleaseMessage = mock(ReleaseMessage.class);
-
-    when(someReleaseMessage.getId()).thenReturn(notificationId);
-    when(releaseMessageService.findLatestReleaseMessageForMessages(anyCollectionOf(String.class)))
-        .thenReturn(someReleaseMessage);
+  public void testPollNotificationWithSomeNamespaceAsFile() throws Exception {
+    String namespace = String.format("someNamespace.xml");
 
-    DeferredResult<ResponseEntity<ApolloConfigNotification>>
-        deferredResult = controller
-        .pollNotification(someAppId, someCluster, defaultNamespace, someDataCenter,
-            someNotificationId, someClientIp);
+    when(namespaceUtil.filterNamespaceName(namespace)).thenReturn(namespace);
 
-    ResponseEntity<ApolloConfigNotification> result =
-        (ResponseEntity<ApolloConfigNotification>) deferredResult.getResult();
+    String someWatchKey = "someKey";
 
-    assertEquals(HttpStatus.OK, result.getStatusCode());
-    assertEquals(defaultNamespace, result.getBody().getNamespaceName());
-    assertEquals(notificationId, result.getBody().getNotificationId());
-  }
+    Set<String> watchKeys = Sets.newHashSet(someWatchKey);
+    when(watchKeysUtil
+        .assembleAllWatchKeys(someAppId, someCluster, namespace, someDataCenter))
+        .thenReturn(
+            watchKeys);
 
-  @Test
-  public void testPollNotificationWithDefaultNamespaceWithDefaultClusterWithDataCenter()
-      throws Exception {
     DeferredResult<ResponseEntity<ApolloConfigNotification>>
         deferredResult = controller
-        .pollNotification(someAppId, defaultCluster, defaultNamespace, someDataCenter,
+        .pollNotification(someAppId, someCluster, namespace, someDataCenter,
             someNotificationId, someClientIp);
 
-    List<String> clusters =
-        Lists.newArrayList(someDataCenter, defaultCluster);
-
-    assertEquals(clusters.size(), deferredResults.size());
+    assertEquals(watchKeys.size(), deferredResults.size());
 
-    for (String cluster : clusters) {
-      String key =
-          Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
-              .join(someAppId, cluster, defaultNamespace);
-      assertTrue(deferredResults.get(key).contains(deferredResult));
+    for (String watchKey : watchKeys) {
+      assertTrue(deferredResults.get(watchKey).contains(deferredResult));
     }
   }
 
   @Test
-  public void testPollNotificationWithDefaultNamespaceWithDefaultClusterWithNoDataCenter()
+  public void testPollNotificationWithDefaultNamespaceWithNotificationIdOutDated()
       throws Exception {
-    DeferredResult<ResponseEntity<ApolloConfigNotification>>
-        deferredResult = controller
-        .pollNotification(someAppId, defaultCluster, defaultNamespace, null, someNotificationId, someClientIp);
-
-    List<String> clusters =
-        Lists.newArrayList(defaultCluster);
-
-    assertEquals(clusters.size(), deferredResults.size());
-
-    for (String cluster : clusters) {
-      String key =
-          Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
-              .join(someAppId, cluster, defaultNamespace);
-      assertTrue(deferredResults.get(key).contains(deferredResult));
-    }
-  }
-
-  @Test
-  public void testPollNotificationWithPublicNamespace() throws Exception {
-    String somePublicAppId = "somePublicAppId";
-    AppNamespace somePublicAppNamespace =
-        assmbleAppNamespace(somePublicAppId, somePublicNamespace);
-
-    when(appNamespaceService.findPublicNamespaceByName(somePublicNamespace))
-        .thenReturn(somePublicAppNamespace);
-
-    DeferredResult<ResponseEntity<ApolloConfigNotification>>
-        deferredResult = controller
-        .pollNotification(someAppId, someCluster, somePublicNamespace, someDataCenter,
-            someNotificationId, someClientIp);
-
-    List<String> clusters =
-        Lists.newArrayList(someCluster, someDataCenter, ConfigConsts.CLUSTER_NAME_DEFAULT);
-
-    assertEquals(clusters.size() * 2, deferredResults.size());
-
-    for (String cluster : clusters) {
-      String publicKey =
-          Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
-              .join(someAppId, cluster, somePublicNamespace);
-      assertTrue(deferredResults.get(publicKey).contains(deferredResult));
-    }
-
-    for (String cluster : clusters) {
-      String publicKey =
-          Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
-              .join(somePublicAppId, cluster, somePublicNamespace);
-      assertTrue(deferredResults.get(publicKey).contains(deferredResult));
-    }
-  }
-
-  @Test
-  public void testPollNotificationWithPublicNamespaceAsFile() throws Exception {
-    String somePublicNamespaceAsFile = String.format("%s.%s", somePublicNamespace, "xml");
-    String somePublicAppId = "somePublicAppId";
-    AppNamespace somePublicAppNamespace =
-        assmbleAppNamespace(somePublicAppId, somePublicNamespace);
-
-    when(namespaceUtil.filterNamespaceName(somePublicNamespaceAsFile))
-        .thenReturn(somePublicNamespace);
-    when(appNamespaceService.findPublicNamespaceByName(somePublicNamespace))
-        .thenReturn(somePublicAppNamespace);
-    when(appNamespaceService.findOne(someAppId, somePublicNamespace)).thenReturn(null);
-
-    DeferredResult<ResponseEntity<ApolloConfigNotification>>
-        deferredResult = controller
-        .pollNotification(someAppId, someCluster, somePublicNamespaceAsFile, someDataCenter,
-            someNotificationId, someClientIp);
-
-    List<String> clusters =
-        Lists.newArrayList(someCluster, someDataCenter, ConfigConsts.CLUSTER_NAME_DEFAULT);
-
-    assertEquals(clusters.size() * 2, deferredResults.size());
-
-    for (String cluster : clusters) {
-      String publicKey =
-          Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
-              .join(someAppId, cluster, somePublicNamespace);
-      assertTrue(deferredResults.get(publicKey).contains(deferredResult));
-    }
-
-    for (String cluster : clusters) {
-      String publicKey =
-          Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
-              .join(somePublicAppId, cluster, somePublicNamespace);
-      assertTrue(deferredResults.get(publicKey).contains(deferredResult));
-    }
-
-
-  }
-
-  @Test
-  public void testPollNotificationWithPublicNamespaceWithNotificationIdOutDated() throws Exception {
     long notificationId = someNotificationId + 1;
+    String releaseMessage = Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
+        .join(someAppId, someCluster, defaultNamespace);
     ReleaseMessage someReleaseMessage = mock(ReleaseMessage.class);
 
-    when(someReleaseMessage.getId()).thenReturn(notificationId);
-    when(releaseMessageService.findLatestReleaseMessageForMessages(anyCollectionOf(String.class)))
-        .thenReturn(someReleaseMessage);
+    String someWatchKey = "someKey";
 
-    String somePublicAppId = "somePublicAppId";
-    AppNamespace somePublicAppNamespace =
-        assmbleAppNamespace(somePublicAppId, somePublicNamespace);
+    Set<String> watchKeys = Sets.newHashSet(someWatchKey);
+    when(watchKeysUtil
+        .assembleAllWatchKeys(someAppId, someCluster, defaultNamespace,
+            someDataCenter))
+        .thenReturn(
+            watchKeys);
 
-    when(appNamespaceService.findPublicNamespaceByName(somePublicNamespace))
-        .thenReturn(somePublicAppNamespace);
+    when(someReleaseMessage.getId()).thenReturn(notificationId);
+    when(someReleaseMessage.getMessage()).thenReturn(releaseMessage);
+    when(releaseMessageService.findLatestReleaseMessageForMessages(watchKeys))
+        .thenReturn(someReleaseMessage);
 
     DeferredResult<ResponseEntity<ApolloConfigNotification>>
         deferredResult = controller
-        .pollNotification(someAppId, someCluster, somePublicNamespace, someDataCenter,
+        .pollNotification(someAppId, someCluster, defaultNamespace, someDataCenter,
             someNotificationId, someClientIp);
 
     ResponseEntity<ApolloConfigNotification> result =
         (ResponseEntity<ApolloConfigNotification>) deferredResult.getResult();
 
     assertEquals(HttpStatus.OK, result.getStatusCode());
-    assertEquals(somePublicNamespace, result.getBody().getNamespaceName());
+    assertEquals(defaultNamespace, result.getBody().getNamespaceName());
     assertEquals(notificationId, result.getBody().getNotificationId());
   }
 
   @Test
   public void testPollNotificationWithDefaultNamespaceAndHandleMessage() throws Exception {
-    DeferredResult<ResponseEntity<ApolloConfigNotification>>
-        deferredResult = controller
-        .pollNotification(someAppId, someCluster, defaultNamespace, someDataCenter,
-            someNotificationId, someClientIp);
-
-    String key =
-        Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
+    String someWatchKey = "someKey";
+    String anotherWatchKey = Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
         .join(someAppId, someCluster, defaultNamespace);
-    long someId = 1;
-    ReleaseMessage someReleaseMessage = new ReleaseMessage(key);
-    someReleaseMessage.setId(someId);
 
-    controller.handleMessage(someReleaseMessage, Topics.APOLLO_RELEASE_TOPIC);
+    Set<String> watchKeys = Sets.newHashSet(someWatchKey, anotherWatchKey);
 
-    ResponseEntity<ApolloConfigNotification> response =
-        (ResponseEntity<ApolloConfigNotification>) deferredResult.getResult();
-    ApolloConfigNotification notification = response.getBody();
-
-    assertEquals(HttpStatus.OK, response.getStatusCode());
-    assertEquals(defaultNamespace, notification.getNamespaceName());
-    assertEquals(someId, notification.getNotificationId());
-  }
-
-  @Test
-  public void testPollNotificationWithPublicNamespaceAndHandleMessage() throws Exception {
-    String somePublicAppId = "somePublicAppId";
-    AppNamespace somePublicAppNamespace =
-        assmbleAppNamespace(somePublicAppId, somePublicNamespace);
-
-    when(appNamespaceService.findPublicNamespaceByName(somePublicNamespace))
-        .thenReturn(somePublicAppNamespace);
+    when(watchKeysUtil
+        .assembleAllWatchKeys(someAppId, someCluster, defaultNamespace,
+            someDataCenter)).thenReturn(
+        watchKeys);
 
     DeferredResult<ResponseEntity<ApolloConfigNotification>>
         deferredResult = controller
-        .pollNotification(someAppId, someCluster, somePublicNamespace, someDataCenter,
+        .pollNotification(someAppId, someCluster, defaultNamespace, someDataCenter,
             someNotificationId, someClientIp);
 
-    String key =
-        Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
-            .join(somePublicAppId, someDataCenter, somePublicNamespace);
     long someId = 1;
-    ReleaseMessage someReleaseMessage = new ReleaseMessage(key);
+    ReleaseMessage someReleaseMessage = new ReleaseMessage(anotherWatchKey);
     someReleaseMessage.setId(someId);
 
     controller.handleMessage(someReleaseMessage, Topics.APOLLO_RELEASE_TOPIC);
@@ -375,14 +224,7 @@ public class NotificationControllerTest {
     ApolloConfigNotification notification = response.getBody();
 
     assertEquals(HttpStatus.OK, response.getStatusCode());
-    assertEquals(somePublicNamespace, notification.getNamespaceName());
+    assertEquals(defaultNamespace, notification.getNamespaceName());
     assertEquals(someId, notification.getNotificationId());
   }
-
-  private AppNamespace assmbleAppNamespace(String appId, String namespace) {
-    AppNamespace appNamespace = new AppNamespace();
-    appNamespace.setAppId(appId);
-    appNamespace.setName(namespace);
-    return appNamespace;
-  }
 }

apollo-configservice/src/test/java/com/ctrip/framework/apollo/configservice/controller/NotificationControllerV2Test.java

+package com.ctrip.framework.apollo.configservice.controller;
+
+import com.google.common.base.Joiner;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.Sets;
+import com.google.gson.Gson;
+
+import com.ctrip.framework.apollo.biz.entity.ReleaseMessage;
+import com.ctrip.framework.apollo.biz.message.Topics;
+import com.ctrip.framework.apollo.biz.service.ReleaseMessageService;
+import com.ctrip.framework.apollo.biz.utils.EntityManagerUtil;
+import com.ctrip.framework.apollo.configservice.util.NamespaceUtil;
+import com.ctrip.framework.apollo.configservice.util.WatchKeysUtil;
+import com.ctrip.framework.apollo.core.ConfigConsts;
+import com.ctrip.framework.apollo.core.dto.ApolloConfigNotification;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.util.ReflectionTestUtils;
+import org.springframework.web.context.request.async.DeferredResult;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * @author Jason Song(song_s@ctrip.com)
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class NotificationControllerV2Test {
+  private NotificationControllerV2 controller;
+  private String someAppId;
+  private String someCluster;
+  private String defaultCluster;
+  private String defaultNamespace;
+  private String somePublicNamespace;
+  private String someDataCenter;
+  private long someNotificationId;
+  private String someClientIp;
+  @Mock
+  private ReleaseMessageService releaseMessageService;
+  @Mock
+  private EntityManagerUtil entityManagerUtil;
+  @Mock
+  private NamespaceUtil namespaceUtil;
+  @Mock
+  private WatchKeysUtil watchKeysUtil;
+  private Gson gson;
+
+  private Multimap<String, DeferredResult<ResponseEntity<List<ApolloConfigNotification>>>>
+      deferredResults;
+
+  @Before
+  public void setUp() throws Exception {
+    controller = new NotificationControllerV2();
+    gson = new Gson();
+    ReflectionTestUtils.setField(controller, "releaseMessageService", releaseMessageService);
+    ReflectionTestUtils.setField(controller, "entityManagerUtil", entityManagerUtil);
+    ReflectionTestUtils.setField(controller, "namespaceUtil", namespaceUtil);
+    ReflectionTestUtils.setField(controller, "watchKeysUtil", watchKeysUtil);
+    ReflectionTestUtils.setField(controller, "gson", gson);
+
+    someAppId = "someAppId";
+    someCluster = "someCluster";
+    defaultCluster = ConfigConsts.CLUSTER_NAME_DEFAULT;
+    defaultNamespace = ConfigConsts.NAMESPACE_APPLICATION;
+    somePublicNamespace = "somePublicNamespace";
+    someDataCenter = "someDC";
+    someNotificationId = 1;
+    someClientIp = "someClientIp";
+
+    when(namespaceUtil.filterNamespaceName(defaultNamespace)).thenReturn(defaultNamespace);
+    when(namespaceUtil.filterNamespaceName(somePublicNamespace)).thenReturn(somePublicNamespace);
+
+    deferredResults =
+        (Multimap<String, DeferredResult<ResponseEntity<List<ApolloConfigNotification>>>>) ReflectionTestUtils
+            .getField(controller, "deferredResults");
+  }
+
+  @Test
+  public void testPollNotificationWithDefaultNamespace() throws Exception {
+    String someWatchKey = "someKey";
+    String anotherWatchKey = "anotherKey";
+
+    Multimap<String, String> watchKeysMap =
+        assembleMultiMap(defaultNamespace, Lists.newArrayList(someWatchKey, anotherWatchKey));
+
+    String notificationAsString =
+        transformApolloConfigNotificationsToString(defaultNamespace, someNotificationId);
+
+    when(watchKeysUtil
+        .assembleAllWatchKeys(someAppId, someCluster, Sets.newHashSet(defaultNamespace),
+            someDataCenter)).thenReturn(
+        watchKeysMap);
+
+    DeferredResult<ResponseEntity<List<ApolloConfigNotification>>>
+        deferredResult = controller
+        .pollNotification(someAppId, someCluster, notificationAsString, someDataCenter,
+            someClientIp);
+
+    assertEquals(watchKeysMap.size(), deferredResults.size());
+
+    for (String watchKey : watchKeysMap.values()) {
+      assertTrue(deferredResults.get(watchKey).contains(deferredResult));
+    }
+  }
+
+  @Test
+  public void testPollNotificationWithDefaultNamespaceAsFile() throws Exception {
+    String namespace = String.format("%s.%s", defaultNamespace, "properties");
+    when(namespaceUtil.filterNamespaceName(namespace)).thenReturn(defaultNamespace);
+
+    String someWatchKey = "someKey";
+    String anotherWatchKey = "anotherKey";
+
+    Multimap<String, String> watchKeysMap =
+        assembleMultiMap(defaultNamespace, Lists.newArrayList(someWatchKey, anotherWatchKey));
+
+    String notificationAsString =
+        transformApolloConfigNotificationsToString(namespace, someNotificationId);
+
+    when(watchKeysUtil
+        .assembleAllWatchKeys(someAppId, someCluster, Sets.newHashSet(defaultNamespace),
+            someDataCenter)).thenReturn(
+        watchKeysMap);
+
+    DeferredResult<ResponseEntity<List<ApolloConfigNotification>>>
+        deferredResult = controller
+        .pollNotification(someAppId, someCluster, notificationAsString, someDataCenter,
+            someClientIp);
+
+    assertEquals(watchKeysMap.size(), deferredResults.size());
+
+    for (String watchKey : watchKeysMap.values()) {
+      assertTrue(deferredResults.get(watchKey).contains(deferredResult));
+    }
+  }
+
+
+  @Test
+  public void testPollNotificationWithMultipleNamespaces() throws Exception {
+    String defaultNamespaceAsFile = defaultNamespace + ".properties";
+    String somePublicNamespaceAsFile = somePublicNamespace + ".xml";
+
+    when(namespaceUtil.filterNamespaceName(defaultNamespaceAsFile)).thenReturn(defaultNamespace);
+    when(namespaceUtil.filterNamespaceName(somePublicNamespaceAsFile))
+        .thenReturn(somePublicNamespaceAsFile);
+
+    String someWatchKey = "someKey";
+    String anotherWatchKey = "anotherKey";
+    String somePublicWatchKey = "somePublicWatchKey";
+    String somePublicFileWatchKey = "somePublicFileWatchKey";
+
+    Multimap<String, String> watchKeysMap =
+        assembleMultiMap(defaultNamespace, Lists.newArrayList(someWatchKey, anotherWatchKey));
+    watchKeysMap
+        .putAll(assembleMultiMap(somePublicNamespace, Lists.newArrayList(somePublicWatchKey)));
+    watchKeysMap
+        .putAll(assembleMultiMap(somePublicNamespaceAsFile,
+            Lists.newArrayList(somePublicFileWatchKey)));
+
+    String notificationAsString =
+        transformApolloConfigNotificationsToString(defaultNamespaceAsFile, someNotificationId,
+            somePublicNamespace, someNotificationId, somePublicNamespaceAsFile,
+            someNotificationId);
+
+    when(watchKeysUtil
+        .assembleAllWatchKeys(someAppId, someCluster,
+            Sets.newHashSet(defaultNamespace, somePublicNamespace, somePublicNamespaceAsFile),
+            someDataCenter)).thenReturn(
+        watchKeysMap);
+
+    DeferredResult<ResponseEntity<List<ApolloConfigNotification>>>
+        deferredResult = controller
+        .pollNotification(someAppId, someCluster, notificationAsString, someDataCenter,
+            someClientIp);
+
+    assertEquals(watchKeysMap.size(), deferredResults.size());
+
+    for (String watchKey : watchKeysMap.values()) {
+      assertTrue(deferredResults.get(watchKey).contains(deferredResult));
+    }
+
+    verify(watchKeysUtil, times(1)).assembleAllWatchKeys(someAppId, someCluster,
+        Sets.newHashSet(defaultNamespace, somePublicNamespace, somePublicNamespaceAsFile),
+        someDataCenter);
+  }
+
+  @Test
+  public void testPollNotificationWithMultipleNamespaceWithNotificationIdOutDated()
+      throws Exception {
+    String someWatchKey = "someKey";
+    String anotherWatchKey = Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
+        .join(someAppId, someCluster, somePublicNamespace);
+    long notificationId = someNotificationId + 1;
+
+    Multimap<String, String> watchKeysMap =
+        assembleMultiMap(defaultNamespace, Lists.newArrayList(someWatchKey));
+    watchKeysMap
+        .putAll(assembleMultiMap(somePublicNamespace, Lists.newArrayList(anotherWatchKey)));
+
+    when(watchKeysUtil
+        .assembleAllWatchKeys(someAppId, someCluster,
+            Sets.newHashSet(defaultNamespace, somePublicNamespace), someDataCenter)).thenReturn(
+        watchKeysMap);
+
+    ReleaseMessage someReleaseMessage = mock(ReleaseMessage.class);
+    when(someReleaseMessage.getId()).thenReturn(notificationId);
+    when(someReleaseMessage.getMessage()).thenReturn(anotherWatchKey);
+    when(releaseMessageService
+        .findLatestReleaseMessagesGroupByMessages(Sets.newHashSet(watchKeysMap.values())))
+        .thenReturn(Lists.newArrayList(someReleaseMessage));
+
+    String notificationAsString =
+        transformApolloConfigNotificationsToString(defaultNamespace, someNotificationId,
+            somePublicNamespace, someNotificationId);
+
+    DeferredResult<ResponseEntity<List<ApolloConfigNotification>>>
+        deferredResult = controller
+        .pollNotification(someAppId, someCluster, notificationAsString, someDataCenter,
+            someClientIp);
+
+    ResponseEntity<List<ApolloConfigNotification>> result =
+        (ResponseEntity<List<ApolloConfigNotification>>) deferredResult.getResult();
+
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, result.getBody().size());
+    assertEquals(somePublicNamespace, result.getBody().get(0).getNamespaceName());
+    assertEquals(notificationId, result.getBody().get(0).getNotificationId());
+  }
+
+  @Test
+  public void testPollNotificationWithMultipleNamespacesAndHandleMessage() throws Exception {
+    String someWatchKey = "someKey";
+    String anotherWatchKey = Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
+        .join(someAppId, someCluster, somePublicNamespace);
+
+    Multimap<String, String> watchKeysMap =
+        assembleMultiMap(defaultNamespace, Lists.newArrayList(someWatchKey));
+    watchKeysMap
+        .putAll(assembleMultiMap(somePublicNamespace, Lists.newArrayList(anotherWatchKey)));
+
+    when(watchKeysUtil
+        .assembleAllWatchKeys(someAppId, someCluster,
+            Sets.newHashSet(defaultNamespace, somePublicNamespace), someDataCenter)).thenReturn(
+        watchKeysMap);
+
+    String notificationAsString =
+        transformApolloConfigNotificationsToString(defaultNamespace, someNotificationId,
+            somePublicNamespace, someNotificationId);
+
+    DeferredResult<ResponseEntity<List<ApolloConfigNotification>>>
+        deferredResult = controller
+        .pollNotification(someAppId, someCluster, notificationAsString, someDataCenter,
+            someClientIp);
+
+    assertEquals(watchKeysMap.size(), deferredResults.size());
+
+    long someId = 1;
+    ReleaseMessage someReleaseMessage = new ReleaseMessage(anotherWatchKey);
+    someReleaseMessage.setId(someId);
+
+    controller.handleMessage(someReleaseMessage, Topics.APOLLO_RELEASE_TOPIC);
+
+    ResponseEntity<List<ApolloConfigNotification>> response =
+        (ResponseEntity<List<ApolloConfigNotification>>) deferredResult.getResult();
+    assertEquals(1, response.getBody().size());
+    ApolloConfigNotification notification = response.getBody().get(0);
+    assertEquals(HttpStatus.OK, response.getStatusCode());
+    assertEquals(somePublicNamespace, notification.getNamespaceName());
+    assertEquals(someId, notification.getNotificationId());
+  }
+
+  private String transformApolloConfigNotificationsToString(
+      String namespace, long notificationId) {
+    List<ApolloConfigNotification> notifications =
+        Lists.newArrayList(assembleApolloConfigNotification(namespace, notificationId));
+    return gson.toJson(notifications);
+  }
+
+  private String transformApolloConfigNotificationsToString(String namespace, long notificationId,
+                                                            String anotherNamespace,
+                                                            long anotherNotificationId) {
+    List<ApolloConfigNotification> notifications =
+        Lists.newArrayList(assembleApolloConfigNotification(namespace, notificationId),
+            assembleApolloConfigNotification(anotherNamespace, anotherNotificationId));
+    return gson.toJson(notifications);
+  }
+
+  private String transformApolloConfigNotificationsToString(String namespace, long notificationId,
+                                                            String anotherNamespace,
+                                                            long anotherNotificationId,
+                                                            String yetAnotherNamespace,
+                                                            long yetAnotherNotificationId) {
+    List<ApolloConfigNotification> notifications =
+        Lists.newArrayList(assembleApolloConfigNotification(namespace, notificationId),
+            assembleApolloConfigNotification(anotherNamespace, anotherNotificationId),
+            assembleApolloConfigNotification(yetAnotherNamespace, yetAnotherNotificationId));
+    return gson.toJson(notifications);
+  }
+
+  private ApolloConfigNotification assembleApolloConfigNotification(String namespace,
+                                                                    long notificationId) {
+    ApolloConfigNotification notification = new ApolloConfigNotification();
+    notification.setNamespaceName(namespace);
+    notification.setNotificationId(notificationId);
+    return notification;
+  }
+
+  private Multimap<String, String> assembleMultiMap(String key, Iterable<String> values) {
+    Multimap<String, String> multimap = HashMultimap.create();
+    multimap.putAll(key, values);
+    return multimap;
+  }
+}

apollo-configservice/src/test/java/com/ctrip/framework/apollo/configservice/integration/AbstractBaseIntegrationTest.java

@@ -24,6 +24,9 @@ import org.springframework.web.client.RestTemplate;
 
 import java.util.Date;
 import java.util.Map;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 import javax.annotation.PostConstruct;
 
@@ -83,4 +86,23 @@ public abstract class AbstractBaseIntegrationTest {
     return release;
   }
 
+  protected void periodicSendMessage(ExecutorService executorService, String message, AtomicBoolean stop) {
+    executorService.submit((Runnable) () -> {
+      //wait for the request connected to server
+      while (!stop.get() && !Thread.currentThread().isInterrupted()) {
+        try {
+          TimeUnit.MILLISECONDS.sleep(100);
+        } catch (InterruptedException e) {
+        }
+
+        //double check
+        if (stop.get()) {
+          break;
+        }
+
+        sendReleaseMessage(message);
+      }
+    });
+  }
+
 }

apollo-configservice/src/test/java/com/ctrip/framework/apollo/configservice/integration/NotificationControllerIntegrationTest.java

@@ -2,22 +2,17 @@ package com.ctrip.framework.apollo.configservice.integration;
 
 import com.google.common.base.Joiner;
 
-import com.ctrip.framework.apollo.biz.entity.ReleaseMessage;
-import com.ctrip.framework.apollo.biz.repository.ReleaseMessageRepository;
-import com.ctrip.framework.apollo.configservice.controller.NotificationController;
 import com.ctrip.framework.apollo.core.ConfigConsts;
 import com.ctrip.framework.apollo.core.dto.ApolloConfigNotification;
 
 import org.junit.Before;
 import org.junit.Test;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.test.context.jdbc.Sql;
 
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
-import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import static org.junit.Assert.assertEquals;
@@ -27,9 +22,6 @@ import static org.junit.Assert.assertNotEquals;
  * @author Jason Song(song_s@ctrip.com)
  */
 public class NotificationControllerIntegrationTest extends AbstractBaseIntegrationTest {
-  @Autowired
-  private NotificationController notificationController;
-
   private String someAppId;
   private String someCluster;
   private String defaultNamespace;
@@ -49,7 +41,7 @@ public class NotificationControllerIntegrationTest extends AbstractBaseIntegrati
   @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
   public void testPollNotificationWithDefaultNamespace() throws Exception {
     AtomicBoolean stop = new AtomicBoolean();
-    periodicSendMessage(assembleKey(someAppId, someCluster, defaultNamespace), stop);
+    periodicSendMessage(executorService, assembleKey(someAppId, someCluster, defaultNamespace), stop);
 
     ResponseEntity<ApolloConfigNotification> result = restTemplate.getForEntity(
         "{baseurl}/notifications?appId={appId}&cluster={clusterName}&namespace={namespace}",
@@ -68,7 +60,7 @@ public class NotificationControllerIntegrationTest extends AbstractBaseIntegrati
   @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
   public void testPollNotificationWithDefaultNamespaceAsFile() throws Exception {
     AtomicBoolean stop = new AtomicBoolean();
-    periodicSendMessage(assembleKey(someAppId, someCluster, defaultNamespace), stop);
+    periodicSendMessage(executorService, assembleKey(someAppId, someCluster, defaultNamespace), stop);
 
     ResponseEntity<ApolloConfigNotification> result = restTemplate.getForEntity(
         "{baseurl}/notifications?appId={appId}&cluster={clusterName}&namespace={namespace}",
@@ -89,7 +81,7 @@ public class NotificationControllerIntegrationTest extends AbstractBaseIntegrati
   public void testPollNotificationWithPrivateNamespaceAsFile() throws Exception {
     String namespace = "someNamespace.xml";
     AtomicBoolean stop = new AtomicBoolean();
-    periodicSendMessage(assembleKey(someAppId, ConfigConsts.CLUSTER_NAME_DEFAULT, namespace), stop);
+    periodicSendMessage(executorService, assembleKey(someAppId, ConfigConsts.CLUSTER_NAME_DEFAULT, namespace), stop);
 
     ResponseEntity<ApolloConfigNotification> result = restTemplate
         .getForEntity(
@@ -144,7 +136,7 @@ public class NotificationControllerIntegrationTest extends AbstractBaseIntegrati
     String publicAppId = "somePublicAppId";
 
     AtomicBoolean stop = new AtomicBoolean();
-    periodicSendMessage(assembleKey(publicAppId, ConfigConsts.CLUSTER_NAME_DEFAULT, somePublicNamespace), stop);
+    periodicSendMessage(executorService, assembleKey(publicAppId, ConfigConsts.CLUSTER_NAME_DEFAULT, somePublicNamespace), stop);
 
     ResponseEntity<ApolloConfigNotification> result = restTemplate
         .getForEntity(
@@ -168,7 +160,7 @@ public class NotificationControllerIntegrationTest extends AbstractBaseIntegrati
     String someDC = "someDC";
 
     AtomicBoolean stop = new AtomicBoolean();
-    periodicSendMessage(assembleKey(publicAppId, someDC, somePublicNamespace), stop);
+    periodicSendMessage(executorService, assembleKey(publicAppId, someDC, somePublicNamespace), stop);
 
     ResponseEntity<ApolloConfigNotification> result = restTemplate
         .getForEntity(
@@ -192,7 +184,7 @@ public class NotificationControllerIntegrationTest extends AbstractBaseIntegrati
     String someDC = "someDC";
 
     AtomicBoolean stop = new AtomicBoolean();
-    periodicSendMessage(assembleKey(publicAppId, someDC, somePublicNamespace), stop);
+    periodicSendMessage(executorService, assembleKey(publicAppId, someDC, somePublicNamespace), stop);
 
     ResponseEntity<ApolloConfigNotification> result = restTemplate
         .getForEntity(
@@ -228,23 +220,4 @@ public class NotificationControllerIntegrationTest extends AbstractBaseIntegrati
   private String assembleKey(String appId, String cluster, String namespace) {
     return Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR).join(appId, cluster, namespace);
   }
-
-  private void periodicSendMessage(String message, AtomicBoolean stop) {
-    executorService.submit((Runnable) () -> {
-      //wait for the request connected to server
-      while (!stop.get() && !Thread.currentThread().isInterrupted()) {
-        try {
-          TimeUnit.MILLISECONDS.sleep(100);
-        } catch (InterruptedException e) {
-        }
-
-        //double check
-        if (stop.get()) {
-          break;
-        }
-
-        sendReleaseMessage(message);
-      }
-    });
-  }
 }

apollo-configservice/src/test/java/com/ctrip/framework/apollo/configservice/integration/NotificationControllerV2IntegrationTest.java

+package com.ctrip.framework.apollo.configservice.integration;
+
+import com.google.common.base.Joiner;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+import com.google.gson.Gson;
+
+import com.ctrip.framework.apollo.core.ConfigConsts;
+import com.ctrip.framework.apollo.core.dto.ApolloConfigNotification;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.jdbc.Sql;
+
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+/**
+ * @author Jason Song(song_s@ctrip.com)
+ */
+public class NotificationControllerV2IntegrationTest extends AbstractBaseIntegrationTest {
+  @Autowired
+  private Gson gson;
+
+  private String someAppId;
+  private String someCluster;
+  private String defaultNamespace;
+  private String somePublicNamespace;
+  private ExecutorService executorService;
+  private ParameterizedTypeReference<List<ApolloConfigNotification>> typeReference;
+
+  @Before
+  public void setUp() throws Exception {
+    someAppId = "someAppId";
+    someCluster = ConfigConsts.CLUSTER_NAME_DEFAULT;
+    defaultNamespace = ConfigConsts.NAMESPACE_APPLICATION;
+    somePublicNamespace = "somePublicNamespace";
+    executorService = Executors.newSingleThreadExecutor();
+    typeReference = new ParameterizedTypeReference<List<ApolloConfigNotification>>() {
+    };
+  }
+
+  @Test(timeout = 5000L)
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWithDefaultNamespace() throws Exception {
+    AtomicBoolean stop = new AtomicBoolean();
+    periodicSendMessage(executorService, assembleKey(someAppId, someCluster, defaultNamespace),
+        stop);
+
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(defaultNamespace, -1));
+
+    stop.set(true);
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, notifications.size());
+    assertEquals(defaultNamespace, notifications.get(0).getNamespaceName());
+    assertNotEquals(0, notifications.get(0).getNotificationId());
+  }
+
+  @Test(timeout = 5000L)
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWithDefaultNamespaceAsFile() throws Exception {
+    AtomicBoolean stop = new AtomicBoolean();
+    periodicSendMessage(executorService, assembleKey(someAppId, someCluster, defaultNamespace),
+        stop);
+
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(defaultNamespace + ".properties", -1));
+
+    stop.set(true);
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, notifications.size());
+    assertEquals(defaultNamespace, notifications.get(0).getNamespaceName());
+    assertNotEquals(0, notifications.get(0).getNotificationId());
+  }
+
+  @Test
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWithMultipleNamespaces() throws Exception {
+    AtomicBoolean stop = new AtomicBoolean();
+    periodicSendMessage(executorService, assembleKey(someAppId, someCluster, somePublicNamespace),
+        stop);
+
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(defaultNamespace + ".properties", -1,
+            defaultNamespace, -1, somePublicNamespace, -1));
+
+    stop.set(true);
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, notifications.size());
+    assertEquals(somePublicNamespace, notifications.get(0).getNamespaceName());
+    assertNotEquals(0, notifications.get(0).getNotificationId());
+  }
+
+  @Test(timeout = 5000L)
+  @Sql(scripts = "/integration-test/test-release.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWithPrivateNamespaceAsFile() throws Exception {
+    String namespace = "someNamespace.xml";
+    AtomicBoolean stop = new AtomicBoolean();
+    periodicSendMessage(executorService,
+        assembleKey(someAppId, ConfigConsts.CLUSTER_NAME_DEFAULT, namespace),
+        stop);
+
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(namespace, -1));
+
+    stop.set(true);
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, notifications.size());
+    assertEquals(namespace, notifications.get(0).getNamespaceName());
+    assertNotEquals(0, notifications.get(0).getNotificationId());
+  }
+
+  @Test(timeout = 5000L)
+  @Sql(scripts = "/integration-test/test-release.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/test-release-message.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWithDefaultNamespaceWithNotificationIdOutDated()
+      throws Exception {
+    long someOutDatedNotificationId = 1;
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(defaultNamespace, someOutDatedNotificationId));
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, notifications.size());
+    assertEquals(defaultNamespace, notifications.get(0).getNamespaceName());
+    assertEquals(10, notifications.get(0).getNotificationId());
+  }
+
+  @Test(timeout = 5000L)
+  @Sql(scripts = "/integration-test/test-release.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWthPublicNamespaceAndNoDataCenter() throws Exception {
+    String publicAppId = "somePublicAppId";
+
+    AtomicBoolean stop = new AtomicBoolean();
+    periodicSendMessage(executorService,
+        assembleKey(publicAppId, ConfigConsts.CLUSTER_NAME_DEFAULT, somePublicNamespace),
+        stop);
+
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(somePublicNamespace, -1));
+
+    stop.set(true);
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, notifications.size());
+    assertEquals(somePublicNamespace, notifications.get(0).getNamespaceName());
+    assertNotEquals(0, notifications.get(0).getNotificationId());
+  }
+
+  @Test(timeout = 5000L)
+  @Sql(scripts = "/integration-test/test-release.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWthPublicNamespaceAndDataCenter() throws Exception {
+    String publicAppId = "somePublicAppId";
+    String someDC = "someDC";
+
+    AtomicBoolean stop = new AtomicBoolean();
+    periodicSendMessage(executorService, assembleKey(publicAppId, someDC, somePublicNamespace),
+        stop);
+
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}&dataCenter={dataCenter}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(somePublicNamespace, -1), someDC);
+
+    stop.set(true);
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, notifications.size());
+    assertEquals(somePublicNamespace, notifications.get(0).getNamespaceName());
+    assertNotEquals(0, notifications.get(0).getNotificationId());
+  }
+
+  @Test(timeout = 5000L)
+  @Sql(scripts = "/integration-test/test-release.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWthMultipleNamespacesAndMultipleNamespacesChanged()
+      throws Exception {
+    String publicAppId = "somePublicAppId";
+    String someDC = "someDC";
+
+    AtomicBoolean stop = new AtomicBoolean();
+    periodicSendMessage(executorService, assembleKey(publicAppId, someDC, somePublicNamespace),
+        stop);
+
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}&dataCenter={dataCenter}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(defaultNamespace, -1, somePublicNamespace, -1),
+        someDC);
+
+    stop.set(true);
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, notifications.size());
+    assertEquals(somePublicNamespace, notifications.get(0).getNamespaceName());
+    assertNotEquals(0, notifications.get(0).getNotificationId());
+  }
+
+  @Test(timeout = 5000L)
+  @Sql(scripts = "/integration-test/test-release.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWthPublicNamespaceAsFile() throws Exception {
+    String publicAppId = "somePublicAppId";
+    String someDC = "someDC";
+
+    AtomicBoolean stop = new AtomicBoolean();
+    periodicSendMessage(executorService, assembleKey(publicAppId, someDC, somePublicNamespace),
+        stop);
+
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}&dataCenter={dataCenter}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(somePublicNamespace + ".properties", -1),
+        someDC);
+
+    stop.set(true);
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, notifications.size());
+    assertEquals(somePublicNamespace, notifications.get(0).getNamespaceName());
+    assertNotEquals(0, notifications.get(0).getNotificationId());
+  }
+
+  @Test(timeout = 5000L)
+  @Sql(scripts = "/integration-test/test-release.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/test-release-message.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWithPublicNamespaceWithNotificationIdOutDated() throws Exception {
+    long someOutDatedNotificationId = 1;
+
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(somePublicNamespace,
+            someOutDatedNotificationId));
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(1, notifications.size());
+    assertEquals(somePublicNamespace, notifications.get(0).getNamespaceName());
+    assertNotEquals(0, notifications.get(0).getNotificationId());
+  }
+
+  @Test(timeout = 5000L)
+  @Sql(scripts = "/integration-test/test-release.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/test-release-message.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+  @Sql(scripts = "/integration-test/cleanup.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+  public void testPollNotificationWithMultipleNamespacesAndNotificationIdsOutDated()
+      throws Exception {
+    long someOutDatedNotificationId = 1;
+
+    ResponseEntity<List<ApolloConfigNotification>> result = restTemplate.exchange(
+        "{baseurl}/notifications/v2?appId={appId}&cluster={clusterName}&notifications={notifications}",
+        HttpMethod.GET, null, typeReference,
+        getHostUrl(), someAppId, someCluster,
+        transformApolloConfigNotificationsToString(somePublicNamespace,
+            someOutDatedNotificationId, defaultNamespace, someOutDatedNotificationId));
+
+    List<ApolloConfigNotification> notifications = result.getBody();
+    assertEquals(HttpStatus.OK, result.getStatusCode());
+    assertEquals(2, notifications.size());
+
+    Set<String> outDatedNamespaces =
+        Sets.newHashSet(notifications.get(0).getNamespaceName(),
+            notifications.get(1).getNamespaceName());
+    assertEquals(Sets.newHashSet(defaultNamespace, somePublicNamespace), outDatedNamespaces);
+    assertNotEquals(0, notifications.get(0).getNotificationId());
+    assertNotEquals(1, notifications.get(1).getNotificationId());
+  }
+
+  private String assembleKey(String appId, String cluster, String namespace) {
+    return Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR).join(appId, cluster, namespace);
+  }
+
+  private String transformApolloConfigNotificationsToString(
+      String namespace, long notificationId) {
+    List<ApolloConfigNotification> notifications =
+        Lists.newArrayList(assembleApolloConfigNotification(namespace, notificationId));
+    return gson.toJson(notifications);
+  }
+
+  private String transformApolloConfigNotificationsToString(String namespace, long notificationId,
+                                                            String anotherNamespace,
+                                                            long anotherNotificationId) {
+    List<ApolloConfigNotification> notifications =
+        Lists.newArrayList(assembleApolloConfigNotification(namespace, notificationId),
+            assembleApolloConfigNotification(anotherNamespace, anotherNotificationId));
+    return gson.toJson(notifications);
+  }
+
+  private String transformApolloConfigNotificationsToString(String namespace, long notificationId,
+                                                            String anotherNamespace,
+                                                            long anotherNotificationId,
+                                                            String yetAnotherNamespace,
+                                                            long yetAnotherNotificationId) {
+    List<ApolloConfigNotification> notifications =
+        Lists.newArrayList(assembleApolloConfigNotification(namespace, notificationId),
+            assembleApolloConfigNotification(anotherNamespace, anotherNotificationId),
+            assembleApolloConfigNotification(yetAnotherNamespace, yetAnotherNotificationId));
+    return gson.toJson(notifications);
+  }
+
+  private ApolloConfigNotification assembleApolloConfigNotification(String namespace,
+                                                                    long notificationId) {
+    ApolloConfigNotification notification = new ApolloConfigNotification();
+    notification.setNamespaceName(namespace);
+    notification.setNotificationId(notificationId);
+    return notification;
+  }
+}

apollo-configservice/src/test/java/com/ctrip/framework/apollo/configservice/util/WatchKeysUtilTest.java

+package com.ctrip.framework.apollo.configservice.util;
+
+import com.google.common.base.Joiner;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.Sets;
+
+import com.ctrip.framework.apollo.biz.service.AppNamespaceService;
+import com.ctrip.framework.apollo.common.entity.AppNamespace;
+import com.ctrip.framework.apollo.core.ConfigConsts;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.test.util.ReflectionTestUtils;
+
+import java.util.Collection;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.when;
+
+/**
+ * @author Jason Song(song_s@ctrip.com)
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class WatchKeysUtilTest {
+  @Mock
+  private AppNamespaceService appNamespaceService;
+  @Mock
+  private AppNamespace someAppNamespace;
+  @Mock
+  private AppNamespace anotherAppNamespace;
+  @Mock
+  private AppNamespace somePublicAppNamespace;
+  private WatchKeysUtil watchKeysUtil;
+  private String someAppId;
+  private String someCluster;
+  private String someNamespace;
+  private String anotherNamespace;
+  private String somePublicNamespace;
+  private String defaultCluster;
+  private String someDC;
+  private String somePublicAppId;
+
+  @Before
+  public void setUp() throws Exception {
+    watchKeysUtil = new WatchKeysUtil();
+
+    someAppId = "someId";
+    someCluster = "someCluster";
+    someNamespace = "someName";
+    anotherNamespace = "anotherName";
+    somePublicNamespace = "somePublicName";
+    defaultCluster = ConfigConsts.CLUSTER_NAME_DEFAULT;
+    someDC = "someDC";
+    somePublicAppId = "somePublicId";
+
+    when(someAppNamespace.getName()).thenReturn(someNamespace);
+    when(anotherAppNamespace.getName()).thenReturn(anotherNamespace);
+    when(appNamespaceService.findByAppIdAndNamespaces(someAppId, Sets.newHashSet(someNamespace)))
+        .thenReturn(Lists.newArrayList(someAppNamespace));
+    when(appNamespaceService
+        .findByAppIdAndNamespaces(someAppId, Sets.newHashSet(someNamespace, anotherNamespace)))
+        .thenReturn(Lists.newArrayList(someAppNamespace, anotherAppNamespace));
+    when(appNamespaceService
+        .findByAppIdAndNamespaces(someAppId,
+            Sets.newHashSet(someNamespace, anotherNamespace, somePublicNamespace)))
+        .thenReturn(Lists.newArrayList(someAppNamespace, anotherAppNamespace));
+
+    when(somePublicAppNamespace.getAppId()).thenReturn(somePublicAppId);
+    when(somePublicAppNamespace.getName()).thenReturn(somePublicNamespace);
+    when(appNamespaceService.findPublicNamespacesByNames(Sets.newHashSet(somePublicNamespace)))
+        .thenReturn(Lists.newArrayList(somePublicAppNamespace));
+
+    ReflectionTestUtils.setField(watchKeysUtil, "appNamespaceService", appNamespaceService);
+  }
+
+  @Test
+  public void testAssembleAllWatchKeysWithOneNamespaceAndDefaultCluster() throws Exception {
+    Set<String> watchKeys =
+        watchKeysUtil.assembleAllWatchKeys(someAppId, defaultCluster, someNamespace, null);
+
+    Set<String> clusters = Sets.newHashSet(defaultCluster);
+
+    assertEquals(clusters.size(), watchKeys.size());
+    assertWatchKeys(someAppId, clusters, someNamespace, watchKeys);
+  }
+
+  @Test
+  public void testAssembleAllWatchKeysWithOneNamespaceAndSomeDC() throws Exception {
+    Set<String> watchKeys =
+        watchKeysUtil.assembleAllWatchKeys(someAppId, someDC, someNamespace, someDC);
+
+    Set<String> clusters = Sets.newHashSet(defaultCluster, someDC);
+
+    assertEquals(clusters.size(), watchKeys.size());
+    assertWatchKeys(someAppId, clusters, someNamespace, watchKeys);
+  }
+
+  @Test
+  public void testAssembleAllWatchKeysWithOneNamespaceAndSomeDCAndSomeCluster() throws Exception {
+    Set<String> watchKeys =
+        watchKeysUtil.assembleAllWatchKeys(someAppId, someCluster, someNamespace, someDC);
+
+    Set<String> clusters = Sets.newHashSet(defaultCluster, someCluster, someDC);
+
+    assertEquals(clusters.size(), watchKeys.size());
+    assertWatchKeys(someAppId, clusters, someNamespace, watchKeys);
+  }
+
+  @Test
+  public void testAssembleAllWatchKeysWithMultipleNamespaces() throws Exception {
+    Multimap<String, String> watchKeysMap =
+        watchKeysUtil.assembleAllWatchKeys(someAppId, someCluster,
+            Sets.newHashSet(someNamespace, anotherNamespace), someDC);
+
+    Set<String> clusters = Sets.newHashSet(defaultCluster, someCluster, someDC);
+
+    assertEquals(clusters.size() * 2, watchKeysMap.size());
+    assertWatchKeys(someAppId, clusters, someNamespace, watchKeysMap.get(someNamespace));
+    assertWatchKeys(someAppId, clusters, anotherNamespace, watchKeysMap.get(anotherNamespace));
+  }
+
+  @Test
+  public void testAssembleAllWatchKeysWithPrivateAndPublicNamespaces() throws Exception {
+    Multimap<String, String> watchKeysMap =
+        watchKeysUtil.assembleAllWatchKeys(someAppId, someCluster,
+            Sets.newHashSet(someNamespace, anotherNamespace, somePublicNamespace), someDC);
+
+    Set<String> clusters = Sets.newHashSet(defaultCluster, someCluster, someDC);
+
+    assertEquals(clusters.size() * 4, watchKeysMap.size());
+
+    assertWatchKeys(someAppId, clusters, someNamespace, watchKeysMap.get(someNamespace));
+    assertWatchKeys(someAppId, clusters, anotherNamespace, watchKeysMap.get(anotherNamespace));
+    assertWatchKeys(someAppId, clusters, somePublicNamespace, watchKeysMap.get(somePublicNamespace));
+    assertWatchKeys(somePublicAppId, clusters, somePublicNamespace, watchKeysMap.get(somePublicNamespace));
+  }
+
+  private void assertWatchKeys(String appId, Set<String> clusters, String namespaceName,
+                               Collection<String> watchedKeys) {
+    for (String cluster : clusters) {
+      String key =
+          Joiner.on(ConfigConsts.CLUSTER_NAMESPACE_SEPARATOR)
+              .join(appId, cluster, namespaceName);
+      assertTrue(watchedKeys.contains(key));
+    }
+  }
+}

apollo-demo/src/main/java/ApolloConfigDemo.java

 import com.ctrip.framework.apollo.Config;
 import com.ctrip.framework.apollo.ConfigChangeListener;
-import com.ctrip.framework.apollo.ConfigFile;
 import com.ctrip.framework.apollo.ConfigService;
-import com.ctrip.framework.apollo.core.enums.ConfigFileFormat;
 import com.ctrip.framework.apollo.model.ConfigChange;
 import com.ctrip.framework.apollo.model.ConfigChangeEvent;
 
@@ -18,11 +16,12 @@ import java.io.InputStreamReader;
  */
 public class ApolloConfigDemo {
   private static final Logger logger = LoggerFactory.getLogger(ApolloConfigDemo.class);
+  private String DEFAULT_VALUE = "undefined";
   private Config config;
+  private Config publicConfig;
 
   public ApolloConfigDemo() {
-    config = ConfigService.getAppConfig();
-    config.addChangeListener(new ConfigChangeListener() {
+    ConfigChangeListener changeListener = new ConfigChangeListener() {
       @Override
       public void onChange(ConfigChangeEvent changeEvent) {
         logger.info("Changes for namespace {}", changeEvent.getNamespace());
@@ -33,12 +32,19 @@ public class ApolloConfigDemo {
               change.getChangeType());
         }
       }
-    });
+    };
+    config = ConfigService.getAppConfig();
+    config.addChangeListener(changeListener);
+    publicConfig = ConfigService.getConfig("FX.apollo");
+    publicConfig.addChangeListener(changeListener);
   }
 
   private String getConfig(String key) {
-    String result = config.getProperty(key, "undefined");
-    logger.info(String.format("Loading key: %s with value: %s", key, result));
+    String result = config.getProperty(key, DEFAULT_VALUE);
+    if (DEFAULT_VALUE.equals(result)) {
+      result = publicConfig.getProperty(key, DEFAULT_VALUE);
+    }
+    logger.info(String.format("Loading key : %s with value: %s", key, result));
     return result;
   }