Java tutorial
/* * Copyright 2012 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. */ //The MIT License // //Copyright (c) 2009 Carl Bystrm // //Permission is hereby granted, free of charge, to any person obtaining a copy //of this software and associated documentation files (the "Software"), to deal //in the Software without restriction, including without limitation the rights //to use, copy, modify, merge, publish, distribute, sublicense, and/or sell //copies of the Software, and to permit persons to whom the Software is //furnished to do so, subject to the following conditions: // //The above copyright notice and this permission notice shall be included in //all copies or substantial portions of the Software. // //THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR //IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, //FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE //AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER //LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, //OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN //THE SOFTWARE. package cc.blynk.integration.model.websocket; import io.netty.channel.Channel; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelPromise; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.handler.codec.http.FullHttpResponse; import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame; import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame; import io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker; import io.netty.handler.codec.http.websocketx.WebSocketFrame; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; import java.nio.charset.StandardCharsets; public class AppWebSocketClientHandler extends SimpleChannelInboundHandler<Object> { private static final Logger log = LogManager.getLogger(AppWebSocketClientHandler.class); private final WebSocketClientHandshaker handshaker; private ChannelPromise handshakeFuture; public AppWebSocketClientHandler(WebSocketClientHandshaker handshaker) { this.handshaker = handshaker; } public ChannelFuture handshakeFuture() { return handshakeFuture; } public void startHandshake(Channel channel) { handshaker.handshake(channel); handshakeFuture = channel.newPromise(); } @Override public void channelInactive(ChannelHandlerContext ctx) { System.out.println("WebSocket Client disconnected!"); } @Override public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception { Channel ch = ctx.channel(); if (!handshaker.isHandshakeComplete()) { handshaker.finishHandshake(ch, (FullHttpResponse) msg); log.trace("WebSocket Client connected!"); if (handshakeFuture != null) { handshakeFuture.setSuccess(); } return; } if (msg instanceof FullHttpResponse) { FullHttpResponse response = (FullHttpResponse) msg; throw new IllegalStateException("Unexpected FullHttpResponse (getStatus=" + response.status() + ", content=" + response.content().toString(StandardCharsets.UTF_8) + ')'); } if (msg instanceof BinaryWebSocketFrame) { BinaryWebSocketFrame frame = (BinaryWebSocketFrame) msg; log.trace("WebSocket Client received message: " + frame.content()); ctx.fireChannelRead(((WebSocketFrame) msg).retain()); } else if (msg instanceof CloseWebSocketFrame) { log.trace("WebSocket Client received closing"); ch.close(); } } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { cause.printStackTrace(); if (!handshakeFuture.isDone()) { handshakeFuture.setFailure(cause); } ctx.close(); } }