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   /*
    * Copyright 2015 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.sctp.multihoming;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.sctp.SctpChannel;
  import io.netty.channel.sctp.SctpChannelOption;
  import io.netty.channel.sctp.nio.NioSctpChannel;
  import io.netty.example.sctp.SctpEchoClientHandler;
  import io.netty.util.internal.SocketUtils;
  
  import java.net.InetAddress;
  import java.net.InetSocketAddress;
  
  /**
   * SCTP Echo Client with multi-homing support.
   */
  public final class SctpMultiHomingEchoClient {
  
      private static final String CLIENT_PRIMARY_HOST = System.getProperty("host.primary", "127.0.0.1");
      private static final String CLIENT_SECONDARY_HOST = System.getProperty("host.secondary", "127.0.0.2");
  
      private static final int CLIENT_PORT = Integer.parseInt(System.getProperty("port.local", "8008"));
  
      private static final String SERVER_REMOTE_HOST = System.getProperty("host.remote", "127.0.0.1");
      private static final int SERVER_REMOTE_PORT = Integer.parseInt(System.getProperty("port.remote", "8007"));
  
      public static void main(String[] args) throws Exception {
          // Configure the client.
          EventLoopGroup group = new NioEventLoopGroup();
          try {
              Bootstrap b = new Bootstrap();
              b.group(group)
               .channel(NioSctpChannel.class)
               .option(SctpChannelOption.SCTP_NODELAY, true)
               .handler(new ChannelInitializer<SctpChannel>() {
                   @Override
                   public void initChannel(SctpChannel ch) throws Exception {
                       ch.pipeline().addLast(
  //                             new LoggingHandler(LogLevel.INFO),
                               new SctpEchoClientHandler());
                   }
               });
  
              InetSocketAddress localAddress = SocketUtils.socketAddress(CLIENT_PRIMARY_HOST, CLIENT_PORT);
              InetAddress localSecondaryAddress = SocketUtils.addressByName(CLIENT_SECONDARY_HOST);
  
              InetSocketAddress remoteAddress = SocketUtils.socketAddress(SERVER_REMOTE_HOST, SERVER_REMOTE_PORT);
  
              // Bind the client channel.
              ChannelFuture bindFuture = b.bind(localAddress).sync();
  
              // Get the underlying sctp channel
              SctpChannel channel = (SctpChannel) bindFuture.channel();
  
              // Bind the secondary address.
              // Please note that, bindAddress in the client channel should be done before connecting if you have not
              // enable Dynamic Address Configuration. See net.sctp.addip_enable kernel param
              channel.bindAddress(localSecondaryAddress).sync();
  
              // Finish connect
              ChannelFuture connectFuture = channel.connect(remoteAddress).sync();
  
              // Wait until the connection is closed.
              connectFuture.channel().closeFuture().sync();
          } finally {
              // Shut down the event loop to terminate all threads.
              group.shutdownGracefully();
          }
      }
  }