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.servlet.mvc.method.annotation; 018 019import org.springframework.web.context.request.async.DeferredResult; 020 021/** 022 * Contract to adapt a single-value async return value to {@code DeferredResult}. 023 * 024 * @author Rossen Stoyanchev 025 * @since 4.3 026 * 027 * @deprecated in 4.3.8 since 5.0 adds first-class support for reactive type 028 * return values from Spring MVC controller methods based on the pluggable 029 * {@code ReactiveAdapterRegistry} mechanism. Yet another alternative would 030 * be to implement a custom 031 * {@link org.springframework.web.method.support.AsyncHandlerMethodReturnValueHandler}. 032 */ 033@Deprecated 034public interface DeferredResultAdapter { 035 036 /** 037 * Create a {@code DeferredResult} for the given return value. 038 * @param returnValue the return value (never {@code null}) 039 * @return the DeferredResult 040 */ 041 DeferredResult<?> adaptToDeferredResult(Object returnValue); 042 043}