001/* 002 * Copyright 2002-2016 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.context.request; 018 019import org.springframework.beans.factory.ObjectFactory; 020import org.springframework.lang.Nullable; 021 022/** 023 * Session-backed {@link org.springframework.beans.factory.config.Scope} 024 * implementation. 025 * 026 * <p>Relies on a thread-bound {@link RequestAttributes} instance, which 027 * can be exported through {@link RequestContextListener}, 028 * {@link org.springframework.web.filter.RequestContextFilter} or 029 * {@link org.springframework.web.servlet.DispatcherServlet}. 030 * 031 * @author Rod Johnson 032 * @author Juergen Hoeller 033 * @author Rob Harrop 034 * @since 2.0 035 * @see RequestContextHolder#currentRequestAttributes() 036 * @see RequestAttributes#SCOPE_SESSION 037 * @see RequestContextListener 038 * @see org.springframework.web.filter.RequestContextFilter 039 * @see org.springframework.web.servlet.DispatcherServlet 040 */ 041public class SessionScope extends AbstractRequestAttributesScope { 042 043 @Override 044 protected int getScope() { 045 return RequestAttributes.SCOPE_SESSION; 046 } 047 048 @Override 049 public String getConversationId() { 050 return RequestContextHolder.currentRequestAttributes().getSessionId(); 051 } 052 053 @Override 054 public Object get(String name, ObjectFactory<?> objectFactory) { 055 Object mutex = RequestContextHolder.currentRequestAttributes().getSessionMutex(); 056 synchronized (mutex) { 057 return super.get(name, objectFactory); 058 } 059 } 060 061 @Override 062 @Nullable 063 public Object remove(String name) { 064 Object mutex = RequestContextHolder.currentRequestAttributes().getSessionMutex(); 065 synchronized (mutex) { 066 return super.remove(name); 067 } 068 } 069 070}