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Spring Framework example source code file (SessionScope.java)

This example Spring Framework source code file (SessionScope.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

abstractrequestattributesscope, abstractrequestattributesscope, object, object, objectfactory, objectfactory, sessionscope, sessionscope, string

The Spring Framework SessionScope.java source code

/*
 * 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 Scope will also work for Portlet environments,
 * through an alternate <code>RequestAttributes 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 in case of the global session as target;
	 * <code>false 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);
		}
	}

}

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