8.4. Credit-based Flow Control

8.4.1. Flow Control Using Credit

A subscriber can control the flow of messages from a subscribed queue by allocating credit to the broker for a particular number of messages or a total size of message content. As the broker delivers messages it spends this credit by decrementing the message credit by one and decrementing the size credit by the size of the content of the message. The broker cannot send a message to a subscription for which it does not have sufficient credit.