动态启停kafka消费者

Kafka中如何动态开启、关闭消费者

使用背景：在开发业务中需要根据具体逻辑选择开启还是关闭消费者

实现逻辑：

1、创建consumer配置类，自定义工厂、自定义消费者配置（省略）

还需要注入consumerService bean（改类里主要是控制动态启停的具体实现方法）

2、接口实现

复制代码

public class ConsumerKafkaService {
   
    private final  Kafka  KafkaListenerEndpointRegistry registry;

    //暂停消费topic
    public  void  pauseTopic(String topic){
   
          MessageListenerContainer  container =getContainer();
          if(Objects.nonNull(container) && container.isRunning() ){
                //取对应topic
                Collection<TopicPartition>  partitions = getTopicPartitions(container);
                partitions.stream.filter(p -> p.topic().contains(topic)).forEach(partition -> {
                if(!container.isPartitionPaused(partition)){
                     container.pausePartition(partition);   
                      log.info("partition:{} 停止消费",partition);
                 }
                });
            } 
        }

    //获取对应topic和分区集合
    private static  Collection<TopicPartition>  getTopicPartitions(MessageListenerContainer  container){
         return Optional.ofNullable(container.getAssignedPartitions()).orElseGet(Collections::emptyList);
    }

    //开启消费
    public  void  resumeTopic(String topic){
   
          MessageListenerContainer  container =getContainer();
          if(Objects.nonNull(container) && container.isRunning() ){
                //取对应topic
                Collection<TopicPartition>  partitions = getTopicPartitions(container);
                partitions.stream.filter(p -> p.topic().contains(topic)).forEach(partition -> {
                if(!container.isPartitionPaused(partition)){
                    container.resumePartition(partition);   
                    log.info("partition:{} 开启消费",partition);
                  }
               });
          } 
      }

    //根据指定id获取容器
    private  MessageListenerContainer   getContainer(){
         return  registry.getListenerContainer("XXX");
   }

    //首次执行，初始化
    public void initPause(){

         MessageListenerContainer  container =getContainer();
         if(Objects.nonNull(container) && container.isRunning() ){
                //取对应topic
                Collection<TopicPartition>  partitions = getTopicPartitions(container);
                partitions.forEach(partition -> {
                if(PlatformCache.availableTopics.contains(partition.topic())){
                     if(container.isPartitionPaused(partition)){
                            container.resumePartition(partition);   
                            log.info("partition:{} 开启消费",partition);
                    }
                 }else{   
                     container.pausePartition(partition);   
                     log.info("partition:{} 暂停消费",partition);
                }
              });
         } 
    }
}

消费监听方法上，@KafkaListener(topicPattern="${topicPattern}",id="XXX",idIsGroup = false)即可监听开启消费的topic数据