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.alibaba.jstorm.message.netty;
  
  import java.net.ConnectException;
  import java.util.concurrent.atomic.AtomicBoolean;
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.channel.ChannelHandlerContext;
  import org.jboss.netty.channel.ChannelStateEvent;
  import org.jboss.netty.channel.ExceptionEvent;
  import org.jboss.netty.channel.MessageEvent;
  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class StormClientHandler extends SimpleChannelUpstreamHandler {
      private static final Logger LOG = LoggerFactory.getLogger(StormClientHandler.class);
      private NettyClient client;
      private AtomicBoolean being_closed;
  
      StormClientHandler(NettyClient client) {
          this.client = client;
          being_closed = client.getBeing_closed();
      }
  
      /**
       * Don't call from underlying netty layer, which will try to obtain the lock of jstorm netty layer
       * which may lead to deadlock
       */
  //    @Override
  //    public void channelInterestChanged(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
  //    	client.notifyInterestChanged(e.getChannel());
  //    }
  
      /**
       * Sometime when connecting to a bad channel which isn't writable, this method will be called
       */
      @Override
      public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent event) {
          // register the newly established channel
          Channel channel = event.getChannel();
          LOG.info("connection established to :{}, local port:{}", client.getRemoteAddr(), channel.getLocalAddress());
  
          client.connectChannel(ctx.getChannel());
          client.handleResponse(ctx.getChannel(), null);
      }
  
      @Override
      public void messageReceived(ChannelHandlerContext ctx, MessageEvent event) {
          client.handleResponse(ctx.getChannel(), event.getMessage());
  
      }
  
      /**
       * @see org.jboss.netty.channel.SimpleChannelUpstreamHandler#exceptionCaught(org.jboss.netty.channel.ChannelHandlerContext,
       * org.jboss.netty.channel.ExceptionEvent)
       */
      @Override
      public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent event) {
          Throwable cause = event.getCause();
          if (!being_closed.get()) {
              if (!(cause instanceof ConnectException)) {
                  LOG.info("Connection failed:" + client.getRemoteAddr(), cause);
              }
  
              client.exceptionChannel(event.getChannel());
              client.reconnect();
          }
      }
  
      /**
       * @see org.jboss.netty.channel.SimpleChannelUpstreamHandler#channelDisconnected(org.jboss.netty.channel.ChannelHandlerContext,
       * org.jboss.netty.channel.ChannelStateEvent)
       */
      @Override
      public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
          LOG.info("Receive channelDisconnected to {}, channel = {}", client.getRemoteAddr(), e.getChannel());
          // ctx.sendUpstream(e);
          super.channelDisconnected(ctx, e);
  
          client.disconnectChannel(e.getChannel());
      }
  
      @Override
      public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
          LOG.info("Connection to {} has been closed, channel = {}", client.getRemoteAddr(), e.getChannel());
          super.channelClosed(ctx, e);
      }
  
      @Override
      public void channelInterestChanged(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
          client.notifyInterestChanged(e.getChannel());
      }
  }
  