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.lang.Nullable; 020 021/** 022 * Request-backed {@link org.springframework.beans.factory.config.Scope} 023 * implementation. 024 * 025 * <p>Relies on a thread-bound {@link RequestAttributes} instance, which 026 * can be exported through {@link RequestContextListener}, 027 * {@link org.springframework.web.filter.RequestContextFilter} or 028 * {@link org.springframework.web.servlet.DispatcherServlet}. 029 * 030 * @author Rod Johnson 031 * @author Juergen Hoeller 032 * @author Rob Harrop 033 * @since 2.0 034 * @see RequestContextHolder#currentRequestAttributes() 035 * @see RequestAttributes#SCOPE_REQUEST 036 * @see RequestContextListener 037 * @see org.springframework.web.filter.RequestContextFilter 038 * @see org.springframework.web.servlet.DispatcherServlet 039 */ 040public class RequestScope extends AbstractRequestAttributesScope { 041 042 @Override 043 protected int getScope() { 044 return RequestAttributes.SCOPE_REQUEST; 045 } 046 047 /** 048 * There is no conversation id concept for a request, so this method 049 * returns {@code null}. 050 */ 051 @Override 052 @Nullable 053 public String getConversationId() { 054 return null; 055 } 056 057}