0cb4cc4e49
Motivation: We wish to separate these two into clearer write/read interfaces. In particular, we don't want to be able to add listeners to promises, because it makes it easy to add them out of order. We can't prevent it entirely, because any promise can be freely converted to a future where listeners can be added. We can, however, discourage this in the API. Modification: The Promise interface no longer extends the Future interface. Numerous changes to make the project compile and its tests run. Result: Clearer separation of concerns in the code.
125 lines
5.0 KiB
Java
125 lines
5.0 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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* https://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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//The MIT License
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//
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//Copyright (c) 2009 Carl Bystršm
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//
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//Permission is hereby granted, free of charge, to any person obtaining a copy
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//of this software and associated documentation files (the "Software"), to deal
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//in the Software without restriction, including without limitation the rights
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//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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//copies of the Software, and to permit persons to whom the Software is
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//furnished to do so, subject to the following conditions:
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//
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//The above copyright notice and this permission notice shall be included in
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//all copies or substantial portions of the Software.
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//
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//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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//THE SOFTWARE.
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package io.netty.example.http.websocketx.client;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.codec.http.FullHttpResponse;
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import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker;
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import io.netty.handler.codec.http.websocketx.WebSocketFrame;
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import io.netty.handler.codec.http.websocketx.WebSocketHandshakeException;
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import io.netty.util.CharsetUtil;
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import io.netty.util.concurrent.Future;
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import io.netty.util.concurrent.Promise;
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public class WebSocketClientHandler extends SimpleChannelInboundHandler<Object> {
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private final WebSocketClientHandshaker handshaker;
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private Promise<Void> handshakeFuture;
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public WebSocketClientHandler(WebSocketClientHandshaker handshaker) {
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this.handshaker = handshaker;
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}
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public Future<Void> handshakeFuture() {
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return handshakeFuture.asFuture();
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}
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@Override
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public void handlerAdded(ChannelHandlerContext ctx) {
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handshakeFuture = ctx.newPromise();
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}
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@Override
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public void channelActive(ChannelHandlerContext ctx) {
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handshaker.handshake(ctx.channel());
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}
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@Override
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public void channelInactive(ChannelHandlerContext ctx) {
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System.out.println("WebSocket Client disconnected!");
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}
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@Override
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public void messageReceived(ChannelHandlerContext ctx, Object msg) throws Exception {
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Channel ch = ctx.channel();
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if (!handshaker.isHandshakeComplete()) {
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try {
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handshaker.finishHandshake(ch, (FullHttpResponse) msg);
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System.out.println("WebSocket Client connected!");
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handshakeFuture.setSuccess(null);
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} catch (WebSocketHandshakeException e) {
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System.out.println("WebSocket Client failed to connect");
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handshakeFuture.setFailure(e);
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}
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return;
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}
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if (msg instanceof FullHttpResponse) {
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FullHttpResponse response = (FullHttpResponse) msg;
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throw new IllegalStateException(
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"Unexpected FullHttpResponse (getStatus=" + response.status() +
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", content=" + response.content().toString(CharsetUtil.UTF_8) + ')');
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}
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WebSocketFrame frame = (WebSocketFrame) msg;
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if (frame instanceof TextWebSocketFrame) {
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TextWebSocketFrame textFrame = (TextWebSocketFrame) frame;
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System.out.println("WebSocket Client received message: " + textFrame.text());
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} else if (frame instanceof PongWebSocketFrame) {
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System.out.println("WebSocket Client received pong");
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} else if (frame instanceof CloseWebSocketFrame) {
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System.out.println("WebSocket Client received closing");
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ch.close();
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
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cause.printStackTrace();
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if (!handshakeFuture.isDone()) {
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handshakeFuture.setFailure(cause);
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}
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ctx.close();
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}
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}
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