code: /*
   * Copyright 2018 Mitsunori Komatsu (komamitsu)
   *
   * Licensed 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 org.komamitsu.fluency.fluentd.ingester.sender.heartbeat;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.nio.channels.SocketChannel;
  
  public class TCPHeartbeater
          extends InetSocketHeartbeater
  {
      private static final Logger LOG = LoggerFactory.getLogger(TCPHeartbeater.class);
      private final Config config;
  
      public TCPHeartbeater()
      {
          this(new Config());
      }
  
      public TCPHeartbeater(final Config config)
      {
          super(config);
          this.config = config;
      }
  
      @Override
      protected void invoke()
              throws IOException
      {
          try (SocketChannel socketChannel = SocketChannel.open(new InetSocketAddress(config.getHost(), config.getPort()))) {
              LOG.trace("TCPHeartbeat: remotePort={}, localPort={}",
                      socketChannel.socket().getPort(), socketChannel.socket().getLocalPort());
              pong();
          }
      }
  
      @Override
      public String toString()
      {
          return "TCPHeartbeater{" +
                  "config=" + config +
                  "} " + super.toString();
      }
  
      public static class Config
              extends InetSocketHeartbeater.Config
      {
      }
  }
  
  