Message listeners and message listening containers

1. Message listener

1.1. Message listener interface

As the name implies, the message listener is used to receive messages. It is a necessary condition for using the message listening container. There are currently 8 message listeners:

• Process individual ConsumerRecord instances received from the Kafka consumer poll() operation, using either autocommit or one of the container-managed commit methods.

  public interface MessageListener<K, V> {
       
        
        
    void onMessage(ConsumerRecord<K