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.util.Map;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.channel.group.DefaultChannelGroup;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class StormChannelGroup extends DefaultChannelGroup {
      private static final Logger LOG = LoggerFactory.getLogger(StormChannelGroup.class);
  
      private Map<String, Channel> channelMap = new ConcurrentHashMap<>();
  
      public StormChannelGroup() {
          super();
      }
  
      public StormChannelGroup(String name) {
          super(name);
      }
  
      public synchronized boolean add(Channel channel) {
          if (channel != null) {
              if (channel.getRemoteAddress() != null) {
                  channelMap.put(channel.getRemoteAddress().toString(), channel);
              }
              return super.add(channel);
          } else {
              return false;
          }
      }
  
      public synchronized boolean remove(Channel channel) {
          channelMap.remove(channel.getRemoteAddress().toString());
          return super.remove(channel);
      }
  
      public Set<String> getAllRemoteAddress() {
          return channelMap.keySet();
      }
  
      public synchronized boolean isChannelReadable(String remoteAddress) {
          Channel ch = channelMap.get(remoteAddress);
          if (ch != null) {
              return ch.isReadable();
          } else {
              return false;
          }
      }
  
      public synchronized boolean suspendChannel(String remoteAddress) {
          Channel ch = channelMap.get(remoteAddress);
          if (ch != null) {
              LOG.debug("Suspend channel={}", remoteAddress);
              ch.setReadable(false);
              return true;
          } else {
              LOG.debug("Channel to be suspended is null!");
              return false;
          }
      }
  
      public synchronized boolean resumeChannel(String remoteAddress) {
          Channel ch = channelMap.get(remoteAddress);
          if (ch != null) {
              LOG.debug("Resume channel={}", remoteAddress);
              ch.setReadable(true);
              return true;
          } else {
              LOG.debug("Channel to be resumed is null");
              return false;
          }
      }
  
      public Channel getChannel(String remoteAddress) {
          return channelMap.get(remoteAddress);
      }
  }