[DefaultLitePullConsumerImpl] There is no way to know whether the consumer has closed.

[JunLu1003]

BUG REPORT

1. Please describe the issue you observed:

• What did you do (The steps to reproduce)?

When the project starts, I use DefaultLitePullConsumerImpl as the consumer, and call the consumer's poll(long timeout) method to do some logic.

public class BizConsumer implements CommandLineRunner {

     private DefaultLitePullConsumer consumer;

     @Override
      public void run(String... args) throws Exception {
          consumer = new DefaultLitePullConsumer("group-name");
          consumer.setNamesrvAddr("server address");
          consumer.subscribe(...);
          consumer.start();
          SomeClass.executeAsync(consumer);
      }

      @PreDestroy
      public void destroy {
          if (consumer != null) {
              consumer.shutdown();
          }
      }
}

public class SomeClass {
    @Async
    public void executeAsync(DefaultLitePullConsumer consumer) {
        while (true) {
            /**
             * When Server shutdown, consumer.poll() will throw a Exception
             */
            List<MessageExt> messages = consumer.poll(5 * 1000);
            ....
        }
   }
}

when the project is closed, I call the consumer's shutdown method, but the consumer's poll(long timeout ) is still running, then I got a Exception: java.lang.IllegalStateException: The consumer not running, please start it first.

I try to find a isClosed() or isRunning() method in DefaultLitePullConsumerImpl class, but I cannot find them.

• What did you expect to see?

Is there a way to know that the consumer client has been closed ?

• What did you see instead?

java.lang.IllegalStateException: The consumer not running, please start it first.

2. Please tell us about your environment:

jdk 8 Springboot 2.2.8 rocketmq-spring-boot-starter 2.1.0 CentOS 7

[RongtongJin]

IMO, it is necessary to add such a method. Could you submit a PR to fix it?

[zongtanghu]

Can you submit a PR to fix this issue? @zhangjidi2016