content: /*
   * Copyright 2013-2023 the original author or authors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.alibaba.cloud.stream.binder.rocketmq.support;
  
  import java.util.Map;
  
  import org.springframework.messaging.MessageHeaders;
  
  /**
   * header value mapper for RocketMQ.
   *
   * @author caotc
   * @since 2.1.1.RELEASE
   */
  public interface RocketMQHeaderMapper {
  
  	/**
  	 * Map from the given {@link MessageHeaders} to the specified target message.
  	 * @param headers the abstracted MessageHeaders.
  	 * @return the native target message.
  	 */
  	Map<String, String> fromHeaders(MessageHeaders headers);
  
  	/**
  	 * Map from the given target message to abstracted {@link MessageHeaders}.
  	 * @param source the native target message.
  	 * @return the target headers.
  	 */
  	MessageHeaders toHeaders(Map<String, String> source);
  
  }
  