001/*
002 * Copyright 2002-2018 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.core;
018
019import java.util.Map;
020
021import org.springframework.lang.Nullable;
022import org.springframework.messaging.Message;
023
024/**
025 * An extension of {@link AbstractMessageReceivingTemplate} that adds support for
026 * request-reply style operations as defined by {@link MessageRequestReplyOperations}.
027 *
028 * @author Mark Fisher
029 * @author Rossen Stoyanchev
030 * @author Stephane Nicoll
031 * @since 4.0
032 * @param <D> the destination type
033 */
034public abstract class AbstractMessagingTemplate<D> extends AbstractMessageReceivingTemplate<D>
035                implements MessageRequestReplyOperations<D> {
036
037        @Override
038        @Nullable
039        public Message<?> sendAndReceive(Message<?> requestMessage) {
040                return sendAndReceive(getRequiredDefaultDestination(), requestMessage);
041        }
042
043        @Override
044        @Nullable
045        public Message<?> sendAndReceive(D destination, Message<?> requestMessage) {
046                return doSendAndReceive(destination, requestMessage);
047        }
048
049        @Nullable
050        protected abstract Message<?> doSendAndReceive(D destination, Message<?> requestMessage);
051
052
053        @Override
054        @Nullable
055        public <T> T convertSendAndReceive(Object request, Class<T> targetClass) {
056                return convertSendAndReceive(getRequiredDefaultDestination(), request, targetClass);
057        }
058
059        @Override
060        @Nullable
061        public <T> T convertSendAndReceive(D destination, Object request, Class<T> targetClass) {
062                return convertSendAndReceive(destination, request, null, targetClass);
063        }
064
065        @Override
066        @Nullable
067        public <T> T convertSendAndReceive(
068                        D destination, Object request, @Nullable Map<String, Object> headers, Class<T> targetClass) {
069
070                return convertSendAndReceive(destination, request, headers, targetClass, null);
071        }
072
073        @Override
074        @Nullable
075        public <T> T convertSendAndReceive(
076                        Object request, Class<T> targetClass, @Nullable MessagePostProcessor postProcessor) {
077
078                return convertSendAndReceive(getRequiredDefaultDestination(), request, targetClass, postProcessor);
079        }
080
081        @Override
082        @Nullable
083        public <T> T convertSendAndReceive(D destination, Object request, Class<T> targetClass,
084                        @Nullable MessagePostProcessor postProcessor) {
085
086                return convertSendAndReceive(destination, request, null, targetClass, postProcessor);
087        }
088
089        @SuppressWarnings("unchecked")
090        @Override
091        @Nullable
092        public <T> T convertSendAndReceive(D destination, Object request, @Nullable Map<String, Object> headers,
093                        Class<T> targetClass, @Nullable MessagePostProcessor postProcessor) {
094
095                Message<?> requestMessage = doConvert(request, headers, postProcessor);
096                Message<?> replyMessage = sendAndReceive(destination, requestMessage);
097                return (replyMessage != null ? (T) getMessageConverter().fromMessage(replyMessage, targetClass) : null);
098        }
099
100}