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; 018 019/** 020 * A generic message representation with headers and body. 021 * 022 * @author Mark Fisher 023 * @author Arjen Poutsma 024 * @since 4.0 025 * @param <T> the payload type 026 * @see org.springframework.messaging.support.MessageBuilder 027 */ 028public interface Message<T> { 029 030 /** 031 * Return the message payload. 032 */ 033 T getPayload(); 034 035 /** 036 * Return message headers for the message (never {@code null} but may be empty). 037 */ 038 MessageHeaders getHeaders(); 039 040}