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}