package com.ctrip.apollo;

 import com.ctrip.apollo.core.ConfigConsts;

 import com.ctrip.apollo.internals.ConfigManager;

 import com.ctrip.apollo.spi.ConfigFactory;

 import com.ctrip.apollo.spi.ConfigRegistry;

 import com.dianping.cat.Cat;

 import org.codehaus.plexus.PlexusContainer;

 import org.codehaus.plexus.component.repository.exception.ComponentLookupException;

 import org.unidal.lookup.ContainerLoader;

 /**

  * Entry point for client config use

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

  */

 public class ConfigService {

   private static final ConfigService s_instance = new ConfigService();

   private PlexusContainer m_container;

   private ConfigService() {

     m_container = ContainerLoader.getDefaultContainer();

   }

   /**

    * Get Application's config instance.

    * @return config instance

    */

   public static Config getAppConfig() {

     return getConfig(ConfigConsts.NAMESPACE_DEFAULT);

   }

   /**

    * Get the config instance for the namespace.

    * @param namespace the namespace of the config

    * @return config instance

    */

   public static Config getConfig(String namespace) {

     Cat.logEvent("Apollo.Client.Version", Apollo.VERSION);

     return getManager().getConfig(namespace);

   }

   private static ConfigManager getManager() {

     try {

       return s_instance.m_container.lookup(ConfigManager.class);

     } catch (ComponentLookupException ex) {

       Cat.logError(ex);

       throw new IllegalStateException("Unable to load ConfigManager!", ex);

     }

   }

   private static ConfigRegistry getRegistry() {

     try {

       return s_instance.m_container.lookup(ConfigRegistry.class);

     } catch (ComponentLookupException ex) {

       Cat.logError(ex);

       throw new IllegalStateException("Unable to load ConfigRegistry!", ex);

     }

   }

   static void setConfig(Config config) {

     setConfig(ConfigConsts.NAMESPACE_DEFAULT, config);

   }

   /**

    * Manually set the config for the namespace specified, use with caution.

    * @param namespace the namespace

    * @param config the config instance

    */

   static void setConfig(String namespace, final Config config) {

     getRegistry().register(namespace, new ConfigFactory() {

       @Override

       public Config create(String namespace) {

         return config;

       }

     });

   }

   static void setConfigFactory(ConfigFactory factory) {

     setConfigFactory(ConfigConsts.NAMESPACE_DEFAULT, factory);

   }

   /**

    * Manually set the config factory for the namespace specified, use with caution.

    * @param namespace the namespace

    * @param factory the factory instance

    */

   static void setConfigFactory(String namespace, ConfigFactory factory) {

     getRegistry().register(namespace, factory);

   }

   // for test only

   static void setContainer(PlexusContainer m_container) {

     s_instance.m_container = m_container;

   }

 }