/*
* Copyright 2002-2007 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.context.request;
import org.springframework.beans.factory.ObjectFactory;
/**
* Session-backed {@link org.springframework.beans.factory.config.Scope}
* implementation.
*
* <p>Relies on a thread-bound {@link RequestAttributes} instance, which
* can be exported through {@link RequestContextListener},
* {@link org.springframework.web.filter.RequestContextFilter} or
* {@link org.springframework.web.servlet.DispatcherServlet}.
*
* <p>This <code>Scope</code> will also work for Portlet environments,
* through an alternate <code>RequestAttributes</code> implementation
* (as exposed out-of-the-box by Spring's
* {@link org.springframework.web.portlet.DispatcherPortlet}.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Rob Harrop
* @since 2.0
* @see RequestContextHolder#currentRequestAttributes()
* @see RequestAttributes#SCOPE_SESSION
* @see RequestAttributes#SCOPE_GLOBAL_SESSION
* @see RequestContextListener
* @see org.springframework.web.filter.RequestContextFilter
* @see org.springframework.web.servlet.DispatcherServlet
* @see org.springframework.web.portlet.DispatcherPortlet
*/
public class SessionScope extends AbstractRequestAttributesScope {
private final int scope;
/**
* Create a new SessionScope, storing attributes in a locally
* isolated session (or default session, if there is no distinction
* between a global session and a component-specific session).
*/
public SessionScope() {
this.scope = RequestAttributes.SCOPE_SESSION;
}
/**
* Create a new SessionScope, specifying whether to store attributes
* in the global session, provided that such a distinction is available.
* <p>This distinction is important for Portlet environments, where there
* are two notions of a session: "portlet scope" and "application scope".
* If this flag is on, objects will be put into the "application scope" session;
* else they will end up in the "portlet scope" session (the typical default).
* <p>In a Servlet environment, this flag is effectively ignored.
* @param globalSession <code>true</code> in case of the global session as target;
* <code>false</code> in case of a component-specific session as target
* @see org.springframework.web.portlet.context.PortletRequestAttributes
* @see org.springframework.web.context.request.ServletRequestAttributes
*/
public SessionScope(boolean globalSession) {
this.scope = (globalSession ? RequestAttributes.SCOPE_GLOBAL_SESSION : RequestAttributes.SCOPE_SESSION);
}
protected int getScope() {
return this.scope;
}
public String getConversationId() {
return RequestContextHolder.currentRequestAttributes().getSessionId();
}
public Object get(String name, ObjectFactory objectFactory) {
Object mutex = RequestContextHolder.currentRequestAttributes().getSessionMutex();
synchronized (mutex) {
return super.get(name, objectFactory);
}
}
public Object remove(String name) {
Object mutex = RequestContextHolder.currentRequestAttributes().getSessionMutex();
synchronized (mutex) {
return super.remove(name);
}
}
}