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.examples.orderly;
  
  import java.util.List;
  
  import org.apache.rocketmq.client.producer.MessageQueueSelector;
  import org.apache.rocketmq.common.message.Message;
  import org.apache.rocketmq.common.message.MessageConst;
  import org.apache.rocketmq.common.message.MessageQueue;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.springframework.messaging.MessageHeaders;
  import org.springframework.stereotype.Component;
  
  
  /**
   * @author sorie
   */
  @Component
  public class OrderlyMessageQueueSelector implements MessageQueueSelector {
  	private static final Logger log = LoggerFactory
  			.getLogger(OrderlyMessageQueueSelector.class);
  
  	/**
  	 * to select a fixed queue by id.
  	 * @param mqs all message queues of this topic.
  	 * @param msg mq message.
  	 * @param arg mq arguments.
  	 * @return message queue selected.
  	 */
  	@Override
  	public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {
  		Integer id = (Integer) ((MessageHeaders) arg).get(MessageConst.PROPERTY_ORIGIN_MESSAGE_ID);
  		int index = id % RocketMQOrderlyConsumeApplication.tags.length % mqs.size();
  		return mqs.get(index);
  	}
  }
  