MessageListener Interface: Consistent Message Reception with onMessage Method

The 'onMessage' method in the MessageListener interface receives a Message object and an optional pattern as its parameters. The Message object represents the received message, while the pattern parameter represents the pattern used to subscribe to the message.

The 'onMessage' method is invoked whenever a message is received. The timing of receiving the message is consistent, meaning the method will be called at the same time for each received message.