Java tutorial
/* * Copyright 2015 Julien Viet * * Licensed 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.termd.core.http.netty; import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.Channel; import io.netty.channel.ChannelFuture; import io.netty.channel.EventLoopGroup; import io.netty.channel.group.ChannelGroup; import io.netty.channel.group.DefaultChannelGroup; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.nio.NioServerSocketChannel; import io.netty.handler.logging.LogLevel; import io.netty.handler.logging.LoggingHandler; import io.netty.util.concurrent.Future; import io.netty.util.concurrent.GenericFutureListener; import io.netty.util.concurrent.ImmediateEventExecutor; import io.termd.core.tty.TtyConnection; import io.termd.core.util.Helper; import java.util.concurrent.CompletableFuture; import java.util.function.Consumer; /** * Convenience class for quickly starting a Netty Tty server. * * @author <a href="mailto:julien@julienviet.com">Julien Viet</a> */ public class NettyWebsocketTtyBootstrap { private final ChannelGroup channelGroup = new DefaultChannelGroup(ImmediateEventExecutor.INSTANCE); private String host; private int port; private EventLoopGroup group; private Channel channel; public NettyWebsocketTtyBootstrap() { this.host = "localhost"; this.port = 8080; } public String getHost() { return host; } public NettyWebsocketTtyBootstrap setHost(String host) { this.host = host; return this; } public int getPort() { return port; } public NettyWebsocketTtyBootstrap setPort(int port) { this.port = port; return this; } public void start(Consumer<TtyConnection> handler, Consumer<Throwable> doneHandler) { group = new NioEventLoopGroup(); ServerBootstrap b = new ServerBootstrap(); b.group(group).channel(NioServerSocketChannel.class).handler(new LoggingHandler(LogLevel.INFO)) .childHandler(new TtyServerInitializer(channelGroup, handler)); ChannelFuture f = b.bind(host, port); f.addListener(abc -> { if (abc.isSuccess()) { channel = f.channel(); doneHandler.accept(null); } else { doneHandler.accept(abc.cause()); } }); } public CompletableFuture<Void> start(Consumer<TtyConnection> handler) throws Exception { CompletableFuture<Void> fut = new CompletableFuture<>(); start(handler, Helper.startedHandler(fut)); return fut; } public void stop(Consumer<Throwable> doneHandler) { if (channel != null) { channel.close(); } channelGroup.close().addListener((Future<Void> f) -> doneHandler.accept(f.cause())); } public CompletableFuture<Void> stop() throws InterruptedException { CompletableFuture<Void> fut = new CompletableFuture<>(); stop(Helper.stoppedHandler(fut)); return fut; } }