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.
51 lines
1.7 KiB
Java
51 lines
1.7 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.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToByteEncoder;
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import java.math.BigInteger;
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/**
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* Encodes a {@link Number} into the binary representation prepended with
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* a magic number ('F' or 0x46) and a 32-bit length prefix. For example, 42
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* will be encoded to { 'F', 0, 0, 0, 1, 42 }.
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*/
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public class NumberEncoder extends MessageToByteEncoder<Number> {
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@Override
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protected void encode(ChannelHandlerContext ctx, Number msg, ByteBuf out) {
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// Convert to a BigInteger first for easier implementation.
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BigInteger v;
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if (msg instanceof BigInteger) {
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v = (BigInteger) msg;
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} else {
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v = new BigInteger(String.valueOf(msg));
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}
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// Convert the number into a byte array.
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byte[] data = v.toByteArray();
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int dataLength = data.length;
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// Write a message.
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out.writeByte((byte) 'F'); // magic number
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out.writeInt(dataLength); // data length
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out.writeBytes(data); // data
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}
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}
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