/*
* 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 io.netty.example.qotm;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.socket.DatagramPacket;
import io.netty.channel.socket.nio.NioDatagramChannel;
import io.netty.channel.nio.NioEventLoopGroup;
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://goo.gl/BsXVR">the official Java tutorial</a>.
*/
public class QuoteOfTheMomentClient {
private final int port;
public QuoteOfTheMomentClient(int port) {
this.port = port;
}
public void run() throws Exception {
Bootstrap b = new Bootstrap();
try {
b.group(new NioEventLoopGroup())
.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.write(new DatagramPacket(
Unpooled.copiedBuffer("QOTM?", CharsetUtil.UTF_8),
new InetSocketAddress("255.255.255.255", port)));
// 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 {
b.shutdown();
}
}
public static void main(String[] args) throws Exception {
int port;
if (args.length > 0) {
port = Integer.parseInt(args[0]);
} else {
port = 8080;
}
new QuoteOfTheMomentClient(port).run();
}
}