package com.ctrip.apollo.internals;

 import com.google.common.collect.Maps;

 import com.ctrip.apollo.Config;

 import com.ctrip.apollo.spi.ConfigFactory;

 import com.ctrip.apollo.spi.ConfigFactoryManager;

 import org.unidal.lookup.annotation.Inject;

 import org.unidal.lookup.annotation.Named;

 import java.util.Map;

 /**

  * @author Jason Song(song_s@ctrip.com)

  */

 @Named(type = ConfigManager.class, value = "default")

 public class DefaultConfigManager implements ConfigManager {

   @Inject

   private ConfigFactoryManager m_factoryManager;

   private Map<String, Config> m_configs = Maps.newConcurrentMap();

   @Override

   public Config getConfig(String namespace) {

     Config config = m_configs.get(namespace);

     if (config == null) {

       synchronized (this) {

         config = m_configs.get(namespace);

         if (config == null) {

           ConfigFactory factory = m_factoryManager.getFactory(namespace);

           config = factory.create(namespace);

           m_configs.put(namespace, config);

         }

       }

     }

     return config;

   }

 }