001/*
002 * Copyright 2002-2013 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 org.springframework.messaging.Message;
020
021/**
022 * A contract for processing a {@link Message} after it has been created, either
023 * returning a modified (effectively new) message or returning the same.
024 *
025 * @author Mark Fisher
026 * @author Rossen Stoyanchev
027 * @since 4.0
028 * @see MessageSendingOperations
029 * @see MessageRequestReplyOperations
030 */
031public interface MessagePostProcessor {
032
033        /**
034         * Process the given message.
035         * @param message the message to process
036         * @return a post-processed variant of the message,
037         * or simply the incoming message; never {@code null}
038         */
039        Message<?> postProcessMessage(Message<?> message);
040
041}