spring SessionFlashMapManager 源码
spring SessionFlashMapManager 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/support/SessionFlashMapManager.java
/*
* Copyright 2002-2014 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.servlet.support;
import java.util.List;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import org.springframework.lang.Nullable;
import org.springframework.web.servlet.FlashMap;
import org.springframework.web.util.WebUtils;
/**
* Store and retrieve {@link FlashMap} instances to and from the HTTP session.
*
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @since 3.1.1
*/
public class SessionFlashMapManager extends AbstractFlashMapManager {
private static final String FLASH_MAPS_SESSION_ATTRIBUTE = SessionFlashMapManager.class.getName() + ".FLASH_MAPS";
/**
* Retrieves saved FlashMap instances from the HTTP session, if any.
*/
@Override
@SuppressWarnings("unchecked")
@Nullable
protected List<FlashMap> retrieveFlashMaps(HttpServletRequest request) {
HttpSession session = request.getSession(false);
return (session != null ? (List<FlashMap>) session.getAttribute(FLASH_MAPS_SESSION_ATTRIBUTE) : null);
}
/**
* Saves the given FlashMap instances in the HTTP session.
*/
@Override
protected void updateFlashMaps(List<FlashMap> flashMaps, HttpServletRequest request, HttpServletResponse response) {
WebUtils.setSessionAttribute(request, FLASH_MAPS_SESSION_ATTRIBUTE, (!flashMaps.isEmpty() ? flashMaps : null));
}
/**
* Exposes the best available session mutex.
* @see org.springframework.web.util.WebUtils#getSessionMutex
* @see org.springframework.web.util.HttpSessionMutexListener
*/
@Override
protected Object getFlashMapsMutex(HttpServletRequest request) {
return WebUtils.getSessionMutex(request.getSession());
}
}
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