Intent

Event Queue is a good pattern if You have a limited accessibility resource (for example: Audio or Database), but You need to handle all the requests that want to use that. It puts all the requests in a queue and process them asynchronously. Gives the resource for the event when it is the next in the queue and in same time removes it from the queue.

Class diagram

Applicability

Use the Event Queue pattern when

You have a limited accessibility resource and the asynchronous process is acceptable to reach that

Credits

[Mihaly Kuprivecz - Event Queue] (http://gameprogrammingpatterns.com/event-queue.html)