001/* 002 * Copyright 2002-2019 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.web.socket.sockjs.transport.handler; 018 019import java.util.Map; 020 021import org.springframework.http.MediaType; 022import org.springframework.http.server.ServerHttpRequest; 023import org.springframework.web.socket.WebSocketHandler; 024import org.springframework.web.socket.sockjs.frame.DefaultSockJsFrameFormat; 025import org.springframework.web.socket.sockjs.frame.SockJsFrameFormat; 026import org.springframework.web.socket.sockjs.transport.SockJsSession; 027import org.springframework.web.socket.sockjs.transport.TransportHandler; 028import org.springframework.web.socket.sockjs.transport.TransportType; 029import org.springframework.web.socket.sockjs.transport.session.PollingSockJsSession; 030 031/** 032 * A {@link TransportHandler} based on XHR (long) polling. 033 * 034 * @author Rossen Stoyanchev 035 * @since 4.0 036 */ 037public class XhrPollingTransportHandler extends AbstractHttpSendingTransportHandler { 038 039 @Override 040 public TransportType getTransportType() { 041 return TransportType.XHR; 042 } 043 044 @Override 045 protected MediaType getContentType() { 046 return new MediaType("application", "javascript", UTF8_CHARSET); 047 } 048 049 @Override 050 protected SockJsFrameFormat getFrameFormat(ServerHttpRequest request) { 051 return new DefaultSockJsFrameFormat("%s\n"); 052 } 053 054 @Override 055 public boolean checkSessionType(SockJsSession session) { 056 return (session instanceof PollingSockJsSession); 057 } 058 059 @Override 060 public PollingSockJsSession createSession( 061 String sessionId, WebSocketHandler handler, Map<String, Object> attributes) { 062 063 return new PollingSockJsSession(sessionId, getServiceConfig(), handler, attributes); 064 } 065 066}