Event Overview

Programs can express interest in events. When an event occurs, it triggers a program callback method to process the event. Events wait in queues until programs dispatch them. Dispatching an event runs its callback method to process the event.

Event queues organize events awaiting dispatch. Programs dispatch events to run callback methods.

Queue groups add flexibility and fine-grained control to the event queue dispatch mechanism. Programs can create groups of queues and dispatch them according to their queue priorities.