001/* 002 * Copyright 2002-2012 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; 018 019/** 020 * Request-backed {@link org.springframework.beans.factory.config.Scope} 021 * implementation. 022 * 023 * <p>Relies on a thread-bound {@link RequestAttributes} instance, which 024 * can be exported through {@link RequestContextListener}, 025 * {@link org.springframework.web.filter.RequestContextFilter} or 026 * {@link org.springframework.web.servlet.DispatcherServlet}. 027 * 028 * <p>This {@code Scope} will also work for Portlet environments, 029 * through an alternate {@code RequestAttributes} implementation 030 * (as exposed out-of-the-box by Spring's 031 * {@link org.springframework.web.portlet.DispatcherPortlet}. 032 * 033 * @author Rod Johnson 034 * @author Juergen Hoeller 035 * @author Rob Harrop 036 * @since 2.0 037 * @see RequestContextHolder#currentRequestAttributes() 038 * @see RequestAttributes#SCOPE_REQUEST 039 * @see RequestContextListener 040 * @see org.springframework.web.filter.RequestContextFilter 041 * @see org.springframework.web.servlet.DispatcherServlet 042 * @see org.springframework.web.portlet.DispatcherPortlet 043 */ 044public class RequestScope extends AbstractRequestAttributesScope { 045 046 @Override 047 protected int getScope() { 048 return RequestAttributes.SCOPE_REQUEST; 049 } 050 051 /** 052 * There is no conversation id concept for a request, so this method 053 * returns {@code null}. 054 */ 055 @Override 056 public String getConversationId() { 057 return null; 058 } 059 060}