content: /*
   * Copyright 1999-2020 Alibaba Group Holding Ltd.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.alibaba.nacos.core.remote;
  
  import com.alibaba.nacos.core.utils.Loggers;
  import org.springframework.stereotype.Service;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * registry for client connection event listeners.
   *
   * @author liuzunfei
   * @version $Id: ClientConnectionEventListenerRegistry.java, v 0.1 2020年07月20日 1:47 PM liuzunfei Exp $
   */
  @Service
  public class ClientConnectionEventListenerRegistry {
      
      final List<ClientConnectionEventListener> clientConnectionEventListeners = new ArrayList<>();
      
      /**
       * notify where a new client connected.
       *
       * @param connection connection that new created.
       */
      public void notifyClientConnected(final Connection connection) {
          
          for (ClientConnectionEventListener clientConnectionEventListener : clientConnectionEventListeners) {
              try {
                  clientConnectionEventListener.clientConnected(connection);
              } catch (Throwable throwable) {
                  Loggers.REMOTE
                          .info("[NotifyClientConnected] failed for listener {}", clientConnectionEventListener.getName(),
                                  throwable);
                  
              }
          }
          
      }
      
      /**
       * notify where a new client disconnected.
       *
       * @param connection connection that disconnected.
       */
      public void notifyClientDisConnected(final Connection connection) {
          
          for (ClientConnectionEventListener clientConnectionEventListener : clientConnectionEventListeners) {
              try {
                  clientConnectionEventListener.clientDisConnected(connection);
              } catch (Throwable throwable) {
                  Loggers.REMOTE.info("[NotifyClientDisConnected] failed for listener {}",
                          clientConnectionEventListener.getName(), throwable);
              }
          }
          
      }
      
      /**
       * register ClientConnectionEventListener.
       *
       * @param listener listener.
       */
      public void registerClientConnectionEventListener(ClientConnectionEventListener listener) {
          Loggers.REMOTE.info("[ClientConnectionEventListenerRegistry] registry listener - " + listener.getClass()
                  .getSimpleName());
          this.clientConnectionEventListeners.add(listener);
      }
      
  }
  