ba28679775
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:
- websocket/html5
- websocketx/sslserver
- localecho/multithreaded
- Add run-example.sh which simplifies launching an example from command
line
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.
91 lines
3.9 KiB
Java
91 lines
3.9 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 org.jboss.netty.example.qotm;
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import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
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import org.jboss.netty.channel.ChannelPipeline;
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import org.jboss.netty.channel.ChannelPipelineFactory;
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import org.jboss.netty.channel.Channels;
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import org.jboss.netty.channel.FixedReceiveBufferSizePredictorFactory;
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import org.jboss.netty.channel.socket.DatagramChannel;
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import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;
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import org.jboss.netty.handler.codec.string.StringDecoder;
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import org.jboss.netty.handler.codec.string.StringEncoder;
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import org.jboss.netty.util.CharsetUtil;
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import java.net.InetSocketAddress;
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import java.util.concurrent.Executors;
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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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ConnectionlessBootstrap b = new ConnectionlessBootstrap(
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new NioDatagramChannelFactory(Executors.newCachedThreadPool()));
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try {
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// Configure the pipeline factory.
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b.setPipelineFactory(new ChannelPipelineFactory() {
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public ChannelPipeline getPipeline() {
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return Channels.pipeline(
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new StringEncoder(CharsetUtil.ISO_8859_1),
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new StringDecoder(CharsetUtil.ISO_8859_1),
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new QuoteOfTheMomentClientHandler());
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}
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});
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// Enable broadcast
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b.setOption("broadcast", "true");
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// Allow packets as large as up to 1024 bytes (default is 768).
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// You could increase or decrease this value to avoid truncated packets
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// or to improve memory footprint respectively.
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//
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// Please also note that a large UDP packet might be truncated or
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// dropped by your router no matter how you configured this option.
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// In UDP, a packet is truncated or dropped if it is larger than a
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// certain size, depending on router configuration. IPv4 routers
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// truncate and IPv6 routers drop a large packet. That's why it is
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// safe to send small packets in UDP.
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b.setOption(
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"receiveBufferSizePredictorFactory",
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new FixedReceiveBufferSizePredictorFactory(1024));
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DatagramChannel c = (DatagramChannel) b.bind(new InetSocketAddress(0));
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// Broadcast the QOTM request to port 8080.
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c.write("QOTM?", new InetSocketAddress("255.255.255.255", PORT));
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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 (!c.getCloseFuture().await(5000)) {
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System.err.println("QOTM request timed out.");
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c.close().sync();
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}
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} finally {
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b.releaseExternalResources();
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}
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}
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}
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