netty5/testsuite-http2/src/main/java/io/netty/testsuite/http2/Http2Server.java

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/*
* Copyright 2017 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.testsuite.http2;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
Decouple EventLoop details from the IO handling for each transport to… (#8680) * 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 .
2019-01-23 08:32:05 +01:00
import io.netty.channel.MultithreadEventLoopGroup;
import io.netty.channel.nio.NioHandler;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
/**
* A HTTP/2 Server that responds to requests with a Hello World. Once started, you can test the
* server with the example client.
*/
public final class Http2Server {
private final int port;
Http2Server(final int port) {
this.port = port;
}
void run() throws Exception {
// Configure the server.
Decouple EventLoop details from the IO handling for each transport to… (#8680) * 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 .
2019-01-23 08:32:05 +01:00
EventLoopGroup group = new MultithreadEventLoopGroup(NioHandler.newFactory());
try {
ServerBootstrap b = new ServerBootstrap();
b.option(ChannelOption.SO_BACKLOG, 1024);
b.group(group)
.channel(NioServerSocketChannel.class)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new Http2ServerInitializer());
Channel ch = b.bind(port).sync().channel();
ch.closeFuture().sync();
} finally {
group.shutdownGracefully();
}
}
public static void main(String[] args) throws Exception {
int port;
if (args.length > 0) {
port = Integer.parseInt(args[0]);
} else {
port = 9000;
}
new Http2Server(port).run();
}
}