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}