3d6e6136a9
* Decouble EventLoop details from the IO handling for each transport to allow easy re-use of code and customization
Motiviation:
As today extending EventLoop implementations to add custom logic / metrics / instrumentations is only possible in a very limited way if at all. This is due the fact that most implementations are final or even package-private. That said even if these would be public there are the ability to do something useful with these is very limited as the IO processing and task processing are very tightly coupled. All of the mentioned things are a big pain point in netty 4.x and need improvement.
Modifications:
This changeset decoubled the IO processing logic from the task processing logic for the main transport (NIO, Epoll, KQueue) by introducing the concept of an IoHandler. The IoHandler itself is responsible to wait for IO readiness and process these IO events. The execution of the IoHandler itself is done by the SingleThreadEventLoop as part of its EventLoop processing. This allows to use the same EventLoopGroup (MultiThreadEventLoupGroup) for all the mentioned transports by just specify a different IoHandlerFactory during construction.
Beside this core API change this changeset also allows to easily extend SingleThreadEventExecutor / SingleThreadEventLoop to add custom logic to it which then can be reused by all the transports. The ideas are very similar to what is provided by ScheduledThreadPoolExecutor (that is part of the JDK). This allows for example things like:
* Adding instrumentation / metrics:
* how many Channels are registered on an SingleThreadEventLoop
* how many Channels were handled during the IO processing in an EventLoop run
* how many task were handled during the last EventLoop / EventExecutor run
* how many outstanding tasks we have
...
...
* Implementing custom strategies for choosing the next EventExecutor / EventLoop to use based on these metrics.
* Use different Promise / Future / ScheduledFuture implementations
* decorate Runnable / Callables when submitted to the EventExecutor / EventLoop
As a lot of functionalities are folded into the MultiThreadEventLoopGroup and SingleThreadEventLoopGroup this changeset also removes:
* AbstractEventLoop
* AbstractEventLoopGroup
* EventExecutorChooser
* EventExecutorChooserFactory
* DefaultEventLoopGroup
* DefaultEventExecutor
* DefaultEventExecutorGroup
Result:
Fixes https://github.com/netty/netty/issues/8514 .
68 lines
2.3 KiB
Java
68 lines
2.3 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.testsuite.autobahn;
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import io.netty.bootstrap.ServerBootstrap;
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import io.netty.buffer.PooledByteBufAllocator;
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import io.netty.channel.ChannelFuture;
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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.MultithreadEventLoopGroup;
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import io.netty.channel.nio.NioHandler;
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import io.netty.channel.socket.nio.NioServerSocketChannel;
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/**
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* A Web Socket echo server for running the
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* <a href="http://autobahn.ws/testsuite/">autobahn test suite</a>
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*/
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public class AutobahnServer {
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private final int port;
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public AutobahnServer(int port) {
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this.port = port;
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}
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public void run() throws Exception {
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EventLoopGroup bossGroup = new MultithreadEventLoopGroup(1, NioHandler.newFactory());
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EventLoopGroup workerGroup = new MultithreadEventLoopGroup(NioHandler.newFactory());
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try {
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ServerBootstrap b = new ServerBootstrap();
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b.group(bossGroup, workerGroup)
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.channel(NioServerSocketChannel.class)
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.childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
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.childHandler(new AutobahnServerInitializer());
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ChannelFuture f = b.bind(port).sync();
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System.out.println("Web Socket Server started at port " + port);
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f.channel().closeFuture().sync();
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} finally {
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bossGroup.shutdownGracefully();
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workerGroup.shutdownGracefully();
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}
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}
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public static void main(String[] args) throws Exception {
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int port;
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if (args.length > 0) {
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port = Integer.parseInt(args[0]);
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} else {
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port = 9000;
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}
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new AutobahnServer(port).run();
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}
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}
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