org.springframework.web.reactive.socket.adapter.JettyWebSocketSession Maven / Gradle / Ivy
/*
* 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 java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import org.eclipse.jetty.websocket.api.Session;
import org.eclipse.jetty.websocket.api.SuspendToken;
import org.eclipse.jetty.websocket.api.WriteCallback;
import reactor.core.publisher.Mono;
import reactor.core.publisher.MonoProcessor;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
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 a Jetty
* WebSocket {@link org.eclipse.jetty.websocket.api.Session}.
*
* @author Violeta Georgieva
* @author Rossen Stoyanchev
* @since 5.0
*/
public class JettyWebSocketSession extends AbstractListenerWebSocketSession {
@Nullable
private volatile SuspendToken suspendToken;
public JettyWebSocketSession(Session session, HandshakeInfo info, DataBufferFactory factory) {
this(session, info, factory, null);
}
public JettyWebSocketSession(Session session, HandshakeInfo info, DataBufferFactory factory,
@Nullable MonoProcessor completionMono) {
super(session, ObjectUtils.getIdentityHexString(session), info, factory, completionMono);
// TODO: suspend causes failures if invoked at this stage
// suspendReceiving();
}
@Override
protected boolean canSuspendReceiving() {
return true;
}
@Override
protected void suspendReceiving() {
Assert.state(this.suspendToken == null, "Already suspended");
this.suspendToken = getDelegate().suspend();
}
@Override
protected void resumeReceiving() {
SuspendToken tokenToUse = this.suspendToken;
this.suspendToken = null;
if (tokenToUse != null) {
tokenToUse.resume();
}
}
@Override
protected boolean sendMessage(WebSocketMessage message) throws IOException {
ByteBuffer buffer = message.getPayload().asByteBuffer();
if (WebSocketMessage.Type.TEXT.equals(message.getType())) {
getSendProcessor().setReadyToSend(false);
String text = new String(buffer.array(), StandardCharsets.UTF_8);
getDelegate().getRemote().sendString(text, new SendProcessorCallback());
}
else if (WebSocketMessage.Type.BINARY.equals(message.getType())) {
getSendProcessor().setReadyToSend(false);
getDelegate().getRemote().sendBytes(buffer, new SendProcessorCallback());
}
else if (WebSocketMessage.Type.PING.equals(message.getType())) {
getDelegate().getRemote().sendPing(buffer);
}
else if (WebSocketMessage.Type.PONG.equals(message.getType())) {
getDelegate().getRemote().sendPong(buffer);
}
else {
throw new IllegalArgumentException("Unexpected message type: " + message.getType());
}
return true;
}
@Override
public Mono close(CloseStatus status) {
getDelegate().close(status.getCode(), status.getReason());
return Mono.empty();
}
private final class SendProcessorCallback implements WriteCallback {
@Override
public void writeFailed(Throwable x) {
getSendProcessor().cancel();
getSendProcessor().onError(x);
}
@Override
public void writeSuccess() {
getSendProcessor().setReadyToSend(true);
getSendProcessor().onWritePossible();
}
}
}