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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.example.udt.echo.rendezvous;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.udt.UdtChannel;
  import io.netty.channel.udt.nio.NioUdtProvider;
  import io.netty.handler.logging.LogLevel;
  import io.netty.handler.logging.LoggingHandler;
  import io.netty.util.concurrent.DefaultThreadFactory;
  
  import java.net.InetSocketAddress;
  import java.util.concurrent.ThreadFactory;
  
  /**
   * UDT Message Flow Peer
   * <p>
   * Sends one message when a connection is open and echoes back any received data
   * to the other peer.
   */
  public abstract class MsgEchoPeerBase {
  
      protected final int messageSize;
      protected final InetSocketAddress self;
      protected final InetSocketAddress peer;
  
      protected MsgEchoPeerBase(final InetSocketAddress self, final InetSocketAddress peer, final int messageSize) {
          this.messageSize = messageSize;
          this.self = self;
          this.peer = peer;
      }
  
      public void run() throws Exception {
          // Configure the peer.
          final ThreadFactory connectFactory = new DefaultThreadFactory("rendezvous");
          final NioEventLoopGroup connectGroup = new NioEventLoopGroup(1,
                  connectFactory, NioUdtProvider.MESSAGE_PROVIDER);
          try {
              final Bootstrap boot = new Bootstrap();
              boot.group(connectGroup)
                      .channelFactory(NioUdtProvider.MESSAGE_RENDEZVOUS)
                      .handler(new ChannelInitializer<UdtChannel>() {
                          @Override
                          public void initChannel(final UdtChannel ch)
                                  throws Exception {
                              ch.pipeline().addLast(
                                      new LoggingHandler(LogLevel.INFO),
                                      new MsgEchoPeerHandler(messageSize));
                          }
                      });
              // Start the peer.
              final ChannelFuture f = boot.connect(peer, self).sync();
              // Wait until the connection is closed.
              f.channel().closeFuture().sync();
          } finally {
              // Shut down the event loop to terminate all threads.
              connectGroup.shutdownGracefully();
          }
      }
  }