com.lunex.inputprocessor.testdemo.QuoteOfTheMomentClient.java Source code

Introduction

Here is the source code for com.lunex.inputprocessor.testdemo.QuoteOfTheMomentClient.java

Source

package com.lunex.inputprocessor.testdemo;

/*
 2    * Copyright 2012 The Netty Project
 3    *
 4    * The Netty Project licenses this file to you under the Apache License,
 5    * version 2.0 (the "License"); you may not use this file except in compliance
 6    * with the License. You may obtain a copy of the License at:
 7    *
 8    *   http://www.apache.org/licenses/LICENSE-2.0
 9    *
 10   * Unless required by applicable law or agreed to in writing, software
 11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 13   * License for the specific language governing permissions and limitations
 14   * under the License.
 15   */

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
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.DatagramPacket;
import io.netty.channel.socket.nio.NioDatagramChannel;
import io.netty.util.CharsetUtil;

import java.net.InetSocketAddress;

/**
 * A UDP broadcast client that asks for a quote of the moment (QOTM) to
 * {@link QuoteOfTheMomentServer}.
 *
 * Inspired by <a href=
 * "http://docs.oracle.com/javase/tutorial/networking/datagrams/clientServer.html"
 * >the official Java tutorial</a>.
 */
public final class QuoteOfTheMomentClient {

    static final int PORT = Integer.parseInt(System.getProperty("port", "7686"));

    public static void main(String[] args) throws Exception {

        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group).channel(NioDatagramChannel.class).option(ChannelOption.SO_BROADCAST, true)
                    .handler(new QuoteOfTheMomentClientHandler());

            Channel ch = b.bind(0).sync().channel();

            // Broadcast the QOTM request to port 8080.
            ch.writeAndFlush(new DatagramPacket(Unpooled.copiedBuffer("QOTM?", CharsetUtil.UTF_8),
                    new InetSocketAddress("255.255.255.255", PORT))).sync();

            // QuoteOfTheMomentClientHandler will close the DatagramChannel when
            // a
            // response is received. If the channel is not closed within 5
            // seconds,
            // print an error message and quit.
            if (!ch.closeFuture().await(5000)) {
                System.err.println("QOTM request timed out.");
            }
        } finally {
            group.shutdownGracefully();
        }
    }
}