spring EventSourceTransportHandler 源码
spring EventSourceTransportHandler 代码
文件路径：/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/EventSourceTransportHandler.java
/*
* Copyright 2002-2019 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.handler;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.sockjs.frame.DefaultSockJsFrameFormat;
import org.springframework.web.socket.sockjs.frame.SockJsFrameFormat;
import org.springframework.web.socket.sockjs.transport.SockJsServiceConfig;
import org.springframework.web.socket.sockjs.transport.SockJsSession;
import org.springframework.web.socket.sockjs.transport.TransportType;
import org.springframework.web.socket.sockjs.transport.session.StreamingSockJsSession;
/**
* A TransportHandler for sending messages via Server-Sent Events:
* <a href="https://dev.w3.org/html5/eventsource/">https://dev.w3.org/html5/eventsource/</a>.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class EventSourceTransportHandler extends AbstractHttpSendingTransportHandler {
@Override
public TransportType getTransportType() {
return TransportType.EVENT_SOURCE;
}
@Override
protected MediaType getContentType() {
return new MediaType("text", "event-stream", StandardCharsets.UTF_8);
}
@Override
public boolean checkSessionType(SockJsSession session) {
return (session instanceof EventSourceStreamingSockJsSession);
}
@Override
public StreamingSockJsSession createSession(
String sessionId, WebSocketHandler handler, Map<String, Object> attributes) {
return new EventSourceStreamingSockJsSession(sessionId, getServiceConfig(), handler, attributes);
}
@Override
protected SockJsFrameFormat getFrameFormat(ServerHttpRequest request) {
return new DefaultSockJsFrameFormat("data: %s\r\n\r\n");
}
private static class EventSourceStreamingSockJsSession extends StreamingSockJsSession {
public EventSourceStreamingSockJsSession(String sessionId, SockJsServiceConfig config,
WebSocketHandler wsHandler, Map<String, Object> attributes) {
super(sessionId, config, wsHandler, attributes);
}
@Override
protected byte[] getPrelude(ServerHttpRequest request) {
return new byte[] {'\r', '\n'};
}
}
}
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