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 org.apache.spark.network.netty;
  
  import java.util.concurrent.TimeUnit;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.oio.OioEventLoopGroup;
  import io.netty.channel.socket.oio.OioSocketChannel;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  class FileClient {
  
    private static final Logger LOG = LoggerFactory.getLogger(FileClient.class.getName());
  
    private final FileClientHandler handler;
    private Channel channel = null;
    private Bootstrap bootstrap = null;
    private EventLoopGroup group = null;
    private final int connectTimeout;
    private final int sendTimeout = 60; // 1 min
  
    FileClient(FileClientHandler handler, int connectTimeout) {
      this.handler = handler;
      this.connectTimeout = connectTimeout;
    }
  
    public void init() {
      group = new OioEventLoopGroup();
      bootstrap = new Bootstrap();
      bootstrap.group(group)
        .channel(OioSocketChannel.class)
        .option(ChannelOption.SO_KEEPALIVE, true)
        .option(ChannelOption.TCP_NODELAY, true)
        .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, connectTimeout)
        .handler(new FileClientChannelInitializer(handler));
    }
  
    public void connect(String host, int port) {
      try {
        // Start the connection attempt.
        channel = bootstrap.connect(host, port).sync().channel();
        // ChannelFuture cf = channel.closeFuture();
        //cf.addListener(new ChannelCloseListener(this));
      } catch (InterruptedException e) {
        LOG.warn("FileClient interrupted while trying to connect", e);
        close();
      }
    }
  
    public void waitForClose() {
      try {
        channel.closeFuture().sync();
      } catch (InterruptedException e) {
        LOG.warn("FileClient interrupted", e);
      }
    }
  
    public void sendRequest(String file) {
      //assert(file == null);
      //assert(channel == null);
        try {
            // Should be able to send the message to network link channel.
            boolean bSent = channel.writeAndFlush(file + "\r\n").await(sendTimeout, TimeUnit.SECONDS);
            if (!bSent) {
                throw new RuntimeException("Failed to send");
            }
        } catch (InterruptedException e) {
            LOG.error("Error", e);
        }
    }
  
    public void close() {
      if (group != null) {
        group.shutdownGracefully();
        group = null;
        bootstrap = null;
      }
    }
  }
  