content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.alipay.remoting.rpc;
  
  import com.alipay.remoting.Connection;
  import com.alipay.remoting.Protocol;
  import com.alipay.remoting.ProtocolCode;
  import com.alipay.remoting.ProtocolManager;
  
  import io.netty.channel.ChannelDuplexHandler;
  import io.netty.channel.ChannelHandler.Sharable;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.timeout.IdleStateEvent;
  
  /**
   * Heart beat triggerd.
   * 
   * @author jiangping
   * @version $Id: SharableHandler.java, v 0.1 2015-12-14 PM3:16:00 tao Exp $
   */
  @Sharable
  public class HeartbeatHandler extends ChannelDuplexHandler {
  
      /**
       * 
       * @see io.netty.channel.ChannelInboundHandlerAdapter#userEventTriggered(io.netty.channel.ChannelHandlerContext, java.lang.Object)
       */
      @Override
      public void userEventTriggered(final ChannelHandlerContext ctx, Object evt) throws Exception {
          if (evt instanceof IdleStateEvent) {
              ProtocolCode protocolCode = ctx.channel().attr(Connection.PROTOCOL).get();
              Protocol protocol = ProtocolManager.getProtocol(protocolCode);
              protocol.getHeartbeatTrigger().heartbeatTriggered(ctx);
          } else {
              super.userEventTriggered(ctx, evt);
          }
      }
  }
  