netty实现broadcast

netty实现broadcast

netty版本

BroadCastServer.java

package com.hikvision.bc;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;

public class BroadCastServer {
    private static void run(int port) {
        EventLoopGroup boss = new NioEventLoopGroup();
        EventLoopGroup worker = new NioEventLoopGroup();
        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(boss, worker)
                    .channel(NioServerSocketChannel.class)                // 设置Channel Type
                    .option(ChannelOption.SO_BACKLOG, 1024)            // 设置Channel属性
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();
                            pipeline.addLast("frameDecoder",
                                    new LengthFieldBasedFrameDecoder(
                                            Integer.MAX_VALUE, 0, 4, 0, 4));
                            pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));
                            pipeline.addLast("decoder", new StringDecoder(CharsetUtil.UTF_8));
                            pipeline.addLast("encoder", new StringEncoder(CharsetUtil.UTF_8));
                            pipeline.addLast(new BroadCastChannelHandler());
                        }
                    });
            ChannelFuture channelFuture = bootstrap.bind(port).sync();
            if (channelFuture.isDone()) {
                System.out.println(String.format("server bind port %s sucess", port));
            }
            Channel channel = channelFuture.channel();
            channel.closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            boss.shutdownGracefully();
            worker.shutdownGracefully();
        }
    }

    public static void main(String[] args) {
        BroadCastServer.run(8080);
    }
}

Client.java

package com.hikvision.bc;


import io.netty.bootstrap.Bootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class Client {
    private static final String host = "127.0.0.1";
    private static final int port = 8080;
    private static final ExecutorService es = Executors.newFixedThreadPool(5);

    private static void start() {
        for (int i = 0; i < 5; i++) {
            es.execute(new Task());
        }
        es.shutdown();
    }

    public static class Task implements Runnable {
        public void run() {
            EventLoopGroup group = new NioEventLoopGroup();
            try {
                Bootstrap bootstrap = new Bootstrap();
                bootstrap.group(group)
                        .channel(NioSocketChannel.class)
                        .option(ChannelOption.TCP_NODELAY, true)
                        .handler(new ChannelInitializer<SocketChannel>() {
                            @Override
                            protected void initChannel(SocketChannel ch) throws Exception {
                                ChannelPipeline pipeline = ch.pipeline();
                                pipeline.addLast("frameDecoder",
                                        new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE,
                                                0, 4, 0, 4));
                                pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));
                                pipeline.addLast("decoder", new StringDecoder(CharsetUtil.UTF_8));
                                pipeline.addLast("encoder", new StringEncoder(CharsetUtil.UTF_8));
                                pipeline.addLast(new SimpleClientChannelHandler());
                            }
                        });
                ChannelFuture channelFuture = bootstrap.connect(host, port).sync();
                if (channelFuture.isSuccess()) {
                    System.out.println(String.format("connect server(%s:%s) sucess", host, port));
                }
                channelFuture.channel().closeFuture().sync();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                group.shutdownGracefully();
            }
        }
    }

    public static void main(String[] args) {
        Client.start();
    }
}

BroadCastChannelHandler.java

package com.hikvision.bc;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.inject.spi.Message;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.group.ChannelMatcher;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.atomic.AtomicInteger;


public class BroadCastChannelHandler extends ChannelInboundHandlerAdapter {
    private static final Gson GSON = new GsonBuilder().create();
    private static final SimpleDateFormat SDF = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private static final AtomicInteger response = new AtomicInteger();

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        Channel ch = ctx.channel();
        if (ChannelGroups.size() > 0) {
            Message msg = new Message(ch.remoteAddress().toString().substring(1), SDF.format(new Date()));
            ChannelGroups.broadcast(GSON.toJson(msg), new ChannelMatchers());
        }
        ChannelGroups.add(ch);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        Channel ch = ctx.channel();
        if (ChannelGroups.contains(ch) && String.valueOf(msg).equals("welcome")) {
            System.out.println(String.format("receive [%s] from [%s] at [%s]",
                    String.valueOf(msg), ch.remoteAddress().toString().substring(1), SDF.format(new Date())));
            response.incrementAndGet();
        }
        synchronized (response) {
            System.out.println(response.get() + "\t" + ChannelGroups.size());
            if (response.get() == ChannelGroups.size() - 1) {
                System.out.println("server close all connected channel");
                ChannelGroups.disconnect();
                response.set(0);
            }
        }
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        ctx.flush();
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        ctx.close();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ChannelGroups.discard(ctx.channel());
        response.decrementAndGet();
    }

    public static class ChannelMatchers implements ChannelMatcher {
        public boolean matches(Channel channel) {
            return true;
        }
    }
}

SimpleClientChannelHandler.java

package com.hikvision.bc;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

public class SimpleClientChannelHandler extends ChannelInboundHandlerAdapter {

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        Channel channel = ctx.channel();
        System.out.println(String.format("client(%s) receive message [%s]",
                channel.localAddress().toString().substring(1), String.valueOf(msg)));
        System.out.println();
        ctx.writeAndFlush(String.valueOf("welcome"));
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        ctx.disconnect(ctx.newPromise());
        ctx.close();
        System.out.println(String.format("client(%s) close sucess",
                ctx.channel().localAddress().toString().substring(1)));
    }
}

ChannelGroups.java

package com.hikvision.bc;


import io.netty.channel.Channel;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.ChannelGroupFuture;
import io.netty.channel.group.ChannelMatcher;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;

public class ChannelGroups {

    private static final ChannelGroup CHANNEL_GROUP = new DefaultChannelGroup("ChannelGroups", GlobalEventExecutor.INSTANCE);

    static void add(Channel channel) {
        CHANNEL_GROUP.add(channel);
    }

    public static ChannelGroupFuture broadcast(Object msg) {
        return CHANNEL_GROUP.writeAndFlush(msg);
    }

    static ChannelGroupFuture broadcast(Object msg, ChannelMatcher matcher) {
        return CHANNEL_GROUP.writeAndFlush(msg, matcher);
    }

    public static ChannelGroup flush() {
        return CHANNEL_GROUP.flush();
    }

    static boolean discard(Channel channel) {
        return CHANNEL_GROUP.remove(channel);
    }

    static ChannelGroupFuture disconnect() {
        return CHANNEL_GROUP.disconnect();
    }

    public static ChannelGroupFuture disconnect(ChannelMatcher matcher) {
        return CHANNEL_GROUP.disconnect(matcher);
    }

    static boolean contains(Channel channel) {
        return CHANNEL_GROUP.contains(channel);
    }

    static int size() {
        return CHANNEL_GROUP.size();
    }
}