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.
54 lines
2.0 KiB
Java
54 lines
2.0 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.factorial;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import java.math.BigInteger;
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/**
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* Handler for a server-side channel. This handler maintains stateful
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* information which is specific to a certain channel using member variables.
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* Therefore, an instance of this handler can cover only one channel. You have
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* to create a new handler instance whenever you create a new channel and insert
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* this handler to avoid a race condition.
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*/
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public class FactorialServerHandler extends SimpleChannelInboundHandler<BigInteger> {
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private BigInteger lastMultiplier = new BigInteger("1");
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private BigInteger factorial = new BigInteger("1");
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@Override
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public void channelRead0(ChannelHandlerContext ctx, BigInteger msg) throws Exception {
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// Calculate the cumulative factorial and send it to the client.
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lastMultiplier = msg;
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factorial = factorial.multiply(msg);
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ctx.writeAndFlush(factorial);
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}
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@Override
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public void channelInactive(ChannelHandlerContext ctx) throws Exception {
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System.err.printf("Factorial of %,d is: %,d%n", lastMultiplier, factorial);
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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cause.printStackTrace();
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ctx.close();
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}
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}
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