apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/controller/NotificationController.java/NotificationController/NotificationController
class NotificationController:  public NotificationController(
      final WatchKeysUtil watchKeysUtil,
      final ReleaseMessageServiceWithCache releaseMessageService,
      final EntityManagerUtil entityManagerUtil,
      final NamespaceUtil namespaceUtil) {
    this.watchKeysUtil = watchKeysUtil;
    this.releaseMessageService = releaseMessageService;
    this.entityManagerUtil = entityManagerUtil;
    this.namespaceUtil = namespaceUtil;
  }