org.springframework.web.socket.sockjs.transport.session.PollingSockJsSession Maven / Gradle / Ivy
/*
* Copyright 2002-2016 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
*
* https://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.socket.sockjs.transport.session;
import java.io.IOException;
import java.util.Map;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.sockjs.SockJsTransportFailureException;
import org.springframework.web.socket.sockjs.frame.SockJsFrame;
import org.springframework.web.socket.sockjs.frame.SockJsMessageCodec;
import org.springframework.web.socket.sockjs.transport.SockJsServiceConfig;
/**
* A SockJS session for use with polling HTTP transports.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class PollingSockJsSession extends AbstractHttpSockJsSession {
public PollingSockJsSession(String sessionId, SockJsServiceConfig config,
WebSocketHandler wsHandler, Map attributes) {
super(sessionId, config, wsHandler, attributes);
}
@Override
protected void handleRequestInternal(ServerHttpRequest request, ServerHttpResponse response,
boolean initialRequest) throws IOException {
if (initialRequest) {
writeFrame(SockJsFrame.openFrame());
}
else if (!getMessageCache().isEmpty()) {
flushCache();
}
else {
scheduleHeartbeat();
}
}
@Override
protected void flushCache() throws SockJsTransportFailureException {
String[] messages = new String[getMessageCache().size()];
for (int i = 0; i < messages.length; i++) {
messages[i] = getMessageCache().poll();
}
SockJsMessageCodec messageCodec = getSockJsServiceConfig().getMessageCodec();
SockJsFrame frame = SockJsFrame.messageFrame(messageCodec, messages);
writeFrame(frame);
}
@Override
protected void writeFrame(SockJsFrame frame) throws SockJsTransportFailureException {
super.writeFrame(frame);
resetRequest();
}
}