content: /*
   * Copyright 2016-2020 Andres Almiray
   *
   * This file is part of Java Trove Examples
   *
   * Java Trove Examples is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * Java Trove Examples is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with Java Trove Examples. If not, see <http://www.gnu.org/licenses/>.
   */
  package org.kordamp.javatrove.chat04.server.impl;
  
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelInboundHandlerAdapter;
  import io.netty.util.ReferenceCountUtil;
  import org.kordamp.javatrove.chat04.ChatHandler;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.List;
  import java.util.concurrent.CopyOnWriteArrayList;
  
  /**
   * @author Andres Almiray
   */
  public class ServerChatHandlerImpl extends ChannelInboundHandlerAdapter implements ChatHandler {
      private static final Logger LOG = LoggerFactory.getLogger(ServerChatHandlerImpl.class);
  
      private final List<Channel> channels = new CopyOnWriteArrayList<>();
  
      @Override
      public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
          try {
              LOG.info("Publishing " + msg);
              channels.forEach(channel -> channel.writeAndFlush(msg));
          } finally {
              ReferenceCountUtil.release(msg);
          }
      }
  
      @Override
      public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
          Channel channel = ctx.channel();
          LOG.info("Adding channel " + channel.id());
          channels.add(channel);
      }
  
      @Override
      public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
          Channel channel = ctx.channel();
          LOG.info("Removing channel " + channel.id());
          channels.remove(channel);
      }
  }
  