com.study.hc.net.netty.EchoServer.java Source code

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Here is the source code for com.study.hc.net.netty.EchoServer.java

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/*
 * Copyright 2012 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:
 *
 *   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 com.study.hc.net.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.util.concurrent.GenericFutureListener;

/**
 * Echoes back any received data from a client.
 */
public final class EchoServer {
    static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));

    public static void main(String[] args) throws Exception {
        // Configure the server.
        // EventLoopGroup   accept NioEventLoop
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        // EventLoopGroup   I/O
        EventLoopGroup workerGroup2 = new NioEventLoopGroup(1);
        try {
            // ??
            ServerBootstrap b = new ServerBootstrap();
            // ???reactor???
            b.group(bossGroup, workerGroup2).channel(NioServerSocketChannel.class)
                    .option(ChannelOption.SO_BACKLOG, 100).handler(new LoggingHandler(LogLevel.DEBUG))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        public void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline p = ch.pipeline();
                            p.addLast(new EchoServerHandler());
                        }
                    });
            // bind??
            ChannelFuture f = b.bind(PORT).sync();
            // ??
            f.channel().closeFuture().sync();
        } finally {
            // 
            bossGroup.shutdownGracefully();
            workerGroup2.shutdownGracefully();
        }
    }
}