org.apache.hadoop.mpich.appmaster.netty.PMIServer.java Source code

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Here is the source code for org.apache.hadoop.mpich.appmaster.netty.PMIServer.java

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/*
 * 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.mpich.appmaster.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import org.apache.hadoop.mpich.MpiProcess;
import org.apache.hadoop.mpich.appmaster.MpiProcessManager;

import java.util.ArrayList;
import java.util.List;

public class PMIServer {
    private int portNum;
    private MpiProcessManager manager;
    private EventLoopGroup bossGroup;
    private EventLoopGroup workerGroup;
    private Channel channel;

    public PMIServer(List<MpiProcess> processes) {
        this.manager = new MpiProcessManager(processes);
    }

    public int getPortNum() {
        return this.portNum;
    }

    public void start() throws Exception {
        this.bossGroup = new NioEventLoopGroup();
        this.workerGroup = new NioEventLoopGroup();
        ServerBootstrap b = new ServerBootstrap();
        b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
                .childHandler(new ServerChannelInitializer(this.manager))
                .childOption(ChannelOption.SO_KEEPALIVE, true);

        // Bind and start to accept incoming connections.
        this.channel = b.bind(0).sync().channel();
        this.portNum = ((NioServerSocketChannel) channel).localAddress().getPort();
    }

    public void stop() throws InterruptedException {
        channel.close().sync();
        workerGroup.shutdownGracefully();
        bossGroup.shutdownGracefully();
    }

    private void waitUntilClose() throws InterruptedException {
        this.channel.closeFuture().sync();
    }

    public static void main(String[] args) throws Exception {
        List<MpiProcess> processes = new ArrayList<MpiProcess>();
        processes.add(new MpiProcess(0, 0, "host1"));
        processes.add(new MpiProcess(1, 1, "host2"));
        PMIServer server = new PMIServer(processes);
        server.start();
        System.out.println(server.getPortNum());
        server.waitUntilClose();
    }
}