001/* 002 * Copyright 2002-2017 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.messaging.handler.invocation; 018 019import java.util.concurrent.CompletableFuture; 020import java.util.concurrent.CompletionStage; 021 022import org.springframework.core.MethodParameter; 023import org.springframework.lang.UsesJava8; 024import org.springframework.util.concurrent.CompletableToListenableFutureAdapter; 025import org.springframework.util.concurrent.ListenableFuture; 026 027/** 028 * Support for {@link CompletableFuture} (and as of 4.3.7 also {@link CompletionStage}) 029 * as a return value type. 030 * 031 * @author Sebastien Deleuze 032 * @author Juergen Hoeller 033 * @since 4.2 034 */ 035@UsesJava8 036public class CompletableFutureReturnValueHandler extends AbstractAsyncReturnValueHandler { 037 038 @Override 039 public boolean supportsReturnType(MethodParameter returnType) { 040 return CompletionStage.class.isAssignableFrom(returnType.getParameterType()); 041 } 042 043 @Override 044 @SuppressWarnings("unchecked") 045 public ListenableFuture<?> toListenableFuture(Object returnValue, MethodParameter returnType) { 046 return new CompletableToListenableFutureAdapter<Object>((CompletionStage<Object>) returnValue); 047 } 048 049}