com.doctor.netty5.ebook.netty_the_definitive_guide.Chapter4ForTimerServer.java Source code

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Here is the source code for com.doctor.netty5.ebook.netty_the_definitive_guide.Chapter4ForTimerServer.java

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/*
 * Copyright (C) 2014- now() The  Netty5-2015  Authors
 *
 * https://github.com/sdcuike
 *
 * Licensed 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.doctor.netty5.ebook.netty_the_definitive_guide;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
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.codec.LineBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;

import java.time.LocalDateTime;

/**
 * Netty??? 4 TCP/
 * 
 * @author doctor
 *
 * @time 2015622 ?8:20:16
 */
public class Chapter4ForTimerServer {

    public static void main(String[] args) throws InterruptedException {
        new Chapter4ForTimerServer().bind(8989);
    }

    public void bind(int port) throws InterruptedException {
        // ??NIO
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
                    .option(ChannelOption.SO_BACKLOG, 1024).childHandler(new ChannelInitializer<SocketChannel>() {

                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ch.pipeline().addLast(new LineBasedFrameDecoder(1024));
                            ch.pipeline().addLast(new StringDecoder());
                            ch.pipeline().addLast(new TimeServerHander());

                        }
                    });

            ChannelFuture future = b.bind(port).sync();
            future.channel().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }

    public static class TimeServerHander extends ChannelHandlerAdapter {
        private int counter;

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            ctx.close();
        }

        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
            String body = (String) msg;
            System.out.println("The time server receive order:" + body + "; thre counter is :" + ++counter);

            String currentTime = "QUERY_TIME_ORDER".equalsIgnoreCase(body) ? LocalDateTime.now().toString()
                    : "BAD ORDER";
            currentTime += System.getProperty("line.separator");
            ByteBuf resp = Unpooled.copiedBuffer(currentTime.getBytes());
            ctx.writeAndFlush(resp);
        }

    }
}