Java tutorial
/* * Copyright 2002-2017 the original author or authors. * * 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 org.springframework.web.reactive.socket.adapter; import io.netty.channel.Channel; import io.netty.channel.ChannelHandler; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelPipeline; import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame; import io.netty.handler.codec.http.websocketx.WebSocketFrame; import io.netty.handler.codec.http.websocketx.WebSocketFrameAggregator; import io.reactivex.netty.protocol.http.ws.WebSocketConnection; import org.reactivestreams.Publisher; import reactor.core.publisher.Flux; import reactor.core.publisher.Mono; import rx.Observable; import rx.RxReactiveStreams; import org.springframework.core.io.buffer.NettyDataBufferFactory; import org.springframework.web.reactive.socket.CloseStatus; import org.springframework.web.reactive.socket.HandshakeInfo; import org.springframework.web.reactive.socket.WebSocketMessage; import org.springframework.web.reactive.socket.WebSocketSession; /** * Spring {@link WebSocketSession} implementation that adapts to the RxNetty * {@link io.reactivex.netty.protocol.http.ws.WebSocketConnection}. * For internal use within the framework. * * @author Rossen Stoyanchev * @since 5.0 */ public class RxNettyWebSocketSession extends NettyWebSocketSessionSupport<WebSocketConnection> { /** * The {@code ChannelHandler} name to use when inserting a * {@link WebSocketFrameAggregator} in the channel pipeline. */ public static final String FRAME_AGGREGATOR_NAME = "websocket-frame-aggregator"; public RxNettyWebSocketSession(WebSocketConnection conn, HandshakeInfo info, NettyDataBufferFactory factory) { super(conn, info, factory); } /** * Insert an {@link WebSocketFrameAggregator} after the * {@code WebSocketFrameDecoder} for receiving full messages. * @param channel the channel for the session * @param frameDecoderName the name of the WebSocketFrame decoder */ public RxNettyWebSocketSession aggregateFrames(Channel channel, String frameDecoderName) { ChannelPipeline pipeline = channel.pipeline(); if (pipeline.context(FRAME_AGGREGATOR_NAME) != null) { return this; } ChannelHandlerContext frameDecoder = pipeline.context(frameDecoderName); if (frameDecoder == null) { throw new IllegalArgumentException("WebSocketFrameDecoder not found: " + frameDecoderName); } ChannelHandler frameAggregator = new WebSocketFrameAggregator(DEFAULT_FRAME_MAX_SIZE); pipeline.addAfter(frameDecoder.name(), FRAME_AGGREGATOR_NAME, frameAggregator); return this; } @Override public Flux<WebSocketMessage> receive() { Observable<WebSocketMessage> messages = getDelegate().getInput() .filter(frame -> !(frame instanceof CloseWebSocketFrame)).map(super::toMessage); return Flux.from(RxReactiveStreams.toPublisher(messages)); } @Override public Mono<Void> send(Publisher<WebSocketMessage> messages) { Observable<WebSocketFrame> frames = RxReactiveStreams.toObservable(messages).map(this::toFrame); Observable<Void> completion = getDelegate().writeAndFlushOnEach(frames); return Mono.from(RxReactiveStreams.toPublisher(completion)); } @Override public Mono<Void> close(CloseStatus status) { Observable<Void> completion = getDelegate().close(); return Mono.from(RxReactiveStreams.toPublisher(completion)); } }