Synchronous and asynchronous message consumers

The synchronous message consumer receives the messages from a queue synchronously and the asynchronous message consumer receives message from a queue asynchronously.

Synchronous message consumers

A synchronous message consumer receives one message at a time. When the Receive(wait interval) method is used; the call waits only a specified period of time in milliseconds for a message, or until the message consumer is closed.

If the ReceiveNoWait() method is used, the synchronous message consumer receives messages without any delay; if the next message is available, it is received immediately, otherwise a pointer to a null Message object is returned.

Asynchronous message consumers

The message listener registered by the application is invoked whenever a new message is available on the queue.