223efc5f99
Motivation: The examples have not been updated since long time ago, showing various issues fixed in this commit. Modifications: - Overall simplification to reduce LoC - Use system properties to get options instead of parsing args. - Minimize option validation - Just use System.out/err instead of Logger - Do not pass config as parameters - just access it directly - Move the main logic to main(String[]) instead of creating a new instance meaninglessly - Update netty-build-21 to make checkstyle not complain - Remove 'throws Exception' clause if possible - Line wrap at 120 (previously at 80) - Add an option to enable SSL for most examples - Use ChannelFuture.sync() instead of await() - Use System.out for the actual result. Use System.err otherwise. - Delete examples that are not very useful: - applet - websocket/html5 - websocketx/sslserver - localecho/multithreaded - Add run-example.sh which simplifies launching an example from command line - Rewrite FileServer example Result: Shorter and simpler examples. A user can focus more on what it actually does than miscellaneous stuff. A user can launch an example very easily.
68 lines
2.5 KiB
Java
68 lines
2.5 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.qotm;
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import io.netty.bootstrap.Bootstrap;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelOption;
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import io.netty.channel.EventLoopGroup;
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import io.netty.channel.nio.NioEventLoopGroup;
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import io.netty.channel.socket.DatagramPacket;
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import io.netty.channel.socket.nio.NioDatagramChannel;
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import io.netty.util.CharsetUtil;
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import java.net.InetSocketAddress;
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/**
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* A UDP broadcast client that asks for a quote of the moment (QOTM) to {@link QuoteOfTheMomentServer}.
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*
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* Inspired by <a href="http://docs.oracle.com/javase/tutorial/networking/datagrams/clientServer.html">the official
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* Java tutorial</a>.
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*/
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public final class QuoteOfTheMomentClient {
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static final int PORT = Integer.parseInt(System.getProperty("port", "7686"));
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public static void main(String[] args) throws Exception {
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EventLoopGroup group = new NioEventLoopGroup();
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try {
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Bootstrap b = new Bootstrap();
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b.group(group)
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.channel(NioDatagramChannel.class)
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.option(ChannelOption.SO_BROADCAST, true)
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.handler(new QuoteOfTheMomentClientHandler());
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Channel ch = b.bind(0).sync().channel();
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// Broadcast the QOTM request to port 8080.
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ch.writeAndFlush(new DatagramPacket(
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Unpooled.copiedBuffer("QOTM?", CharsetUtil.UTF_8),
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new InetSocketAddress("255.255.255.255", PORT))).sync();
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// QuoteOfTheMomentClientHandler will close the DatagramChannel when a
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// response is received. If the channel is not closed within 5 seconds,
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// print an error message and quit.
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if (!ch.closeFuture().await(5000)) {
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System.err.println("QOTM request timed out.");
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}
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} finally {
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group.shutdownGracefully();
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}
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}
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}
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