LogEventMonitor.java

package com.yichao.woo.netty.in.action.ch13;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioDatagramChannel;

import java.net.InetSocketAddress;

/**
 * Created by Yichao-Woo.
 */
public class LogEventMonitor {
    private final EventLoopGroup group;
    private final Bootstrap bootstrap;

    public LogEventMonitor(InetSocketAddress address) {
        group = new NioEventLoopGroup();
        bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioDatagramChannel.class)
                .option(ChannelOption.SO_BROADCAST, true)
                .handler(
                        new ChannelInitializer<Channel>() {
                            @Override
                            protected void initChannel(Channel ch) throws Exception {
                                ChannelPipeline pipeline = ch.pipeline();
                                pipeline.addLast(new LogEventDecoder());
                                pipeline.addLast(new LogEventHandler());
                            }
                        }
                )
                .localAddress(address);
    }

    public Channel bind() throws InterruptedException {
        return bootstrap.bind().sync().channel();
    }

    public void stop() {
        group.shutdownGracefully();
    }

    public static void main(String[] args) throws InterruptedException {
        if (args.length != 1) {
            throw new IllegalArgumentException();
        }

        LogEventMonitor monitor = new LogEventMonitor(new InetSocketAddress(Integer.parseInt(args[0])));

        try {
            Channel channel = monitor.bind();
            System.out.println("LogEvent running");
            channel.closeFuture().sync();
        } finally {
            monitor.stop();
        }
    }
}