content: package com.ctrip.framework.apollo.configservice;
  
  import com.ctrip.framework.apollo.biz.config.BizConfig;
  import com.ctrip.framework.apollo.biz.grayReleaseRule.GrayReleaseRulesHolder;
  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 com.ctrip.framework.apollo.configservice.service.ReleaseMessageServiceWithCache;
  
  import com.ctrip.framework.apollo.configservice.service.config.ConfigService;
  import com.ctrip.framework.apollo.configservice.service.config.ConfigServiceWithCache;
  import com.ctrip.framework.apollo.configservice.service.config.DefaultConfigService;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Configuration;
  
  /**
   * @author Jason Song(song_s@ctrip.com)
   */
  @Configuration
  public class ConfigServiceAutoConfiguration {
  
    @Autowired
    private BizConfig bizConfig;
  
    @Bean
    public GrayReleaseRulesHolder grayReleaseRulesHolder() {
      return new GrayReleaseRulesHolder();
    }
  
    @Bean
    public ConfigService configService() {
      if (bizConfig.isConfigServiceCacheEnabled()) {
        return new ConfigServiceWithCache();
      }
      return new DefaultConfigService();
    }
  
    @Configuration
    static class MessageScannerConfiguration {
      @Autowired
      private NotificationController notificationController;
      @Autowired
      private ConfigFileController configFileController;
      @Autowired
      private NotificationControllerV2 notificationControllerV2;
      @Autowired
      private GrayReleaseRulesHolder grayReleaseRulesHolder;
      @Autowired
      private ReleaseMessageServiceWithCache releaseMessageServiceWithCache;
      @Autowired
      private ConfigService configService;
  
      @Bean
      public ReleaseMessageScanner releaseMessageScanner() {
        ReleaseMessageScanner releaseMessageScanner = new ReleaseMessageScanner();
        //0. handle release message cache
        releaseMessageScanner.addMessageListener(releaseMessageServiceWithCache);
        //1. handle gray release rule
        releaseMessageScanner.addMessageListener(grayReleaseRulesHolder);
        //2. handle server cache
        releaseMessageScanner.addMessageListener(configService);
        releaseMessageScanner.addMessageListener(configFileController);
        //3. notify clients
        releaseMessageScanner.addMessageListener(notificationControllerV2);
        releaseMessageScanner.addMessageListener(notificationController);
        return releaseMessageScanner;
      }
    }
  
  }
  