hadoop SimpleTcpClient 源码

haddop SimpleTcpClient 代码

文件路径：/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/SimpleTcpClient.java

/**
 * 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.hadoop.oncrpc;

import java.net.InetSocketAddress;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import org.apache.hadoop.classification.VisibleForTesting;

/**
 * A simple TCP based RPC client which just sends a request to a server.
 */
public class SimpleTcpClient {
  protected final String host;
  protected final int port;
  protected final XDR request;
  protected final boolean oneShot;
  private NioEventLoopGroup workerGroup;
  private ChannelFuture future;
  
  public SimpleTcpClient(String host, int port, XDR request) {
    this(host,port, request, true);
  }
  
  public SimpleTcpClient(String host, int port, XDR request, Boolean oneShot) {
    this.host = host;
    this.port = port;
    this.request = request;
    this.oneShot = oneShot;
  }

  protected ChannelInitializer<SocketChannel> setChannelHandler() {
    return new ChannelInitializer<SocketChannel>() {
      @Override
      protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline p = ch.pipeline();
        p.addLast(
            RpcUtil.constructRpcFrameDecoder(),
            new SimpleTcpClientHandler(request)
        );
      }
    };
  }

  @VisibleForTesting
  public void run() {
    // Configure the client.
    workerGroup = new NioEventLoopGroup();
    Bootstrap bootstrap = new Bootstrap()
        .group(workerGroup)
        .channel(NioSocketChannel.class);

    try {
      future = bootstrap.handler(setChannelHandler())
          .option(ChannelOption.TCP_NODELAY, true)
          .option(ChannelOption.SO_KEEPALIVE, true)
          .connect(new InetSocketAddress(host, port)).sync();
    } catch (InterruptedException e) {
      e.printStackTrace();
    } finally {
      if (oneShot) {
        stop();
      }
    }
  }

  public void stop() {
    try {
      if (future != null) {
        // Wait until the connection is closed or the connection attempt fails.
        future.channel().closeFuture().sync();
      }

    } catch (InterruptedException e) {
      e.printStackTrace();
    } finally {
      // Shut down thread pools to exit.
      workerGroup.shutdownGracefully();
    }
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop RegistrationClient 源码

hadoop RpcAcceptedReply 源码

hadoop RpcCall 源码

hadoop RpcCallCache 源码

hadoop RpcDeniedReply 源码

hadoop RpcInfo 源码

hadoop RpcMessage 源码

hadoop RpcProgram 源码

hadoop RpcReply 源码

hadoop RpcResponse 源码