Higher priority queues can have a larger pool of consumers running on faster hardware than lower priority queues. Each queue can have a separate pool of consumers. The application is responsible for posting messages to the appropriate queue. In systems that don't support priority-based message queues, an alternative solution is to maintain a separate queue for each priority. Most message queue implementations support multiple consumers (following the Competing Consumers pattern), and the number of consumer processes can be scaled up or down depending on demand. The figure illustrates a queue with priority messaging. The application posting a message can assign a priority and the messages in the queue are automatically reordered so that those with a higher priority will be received before those with a lower priority. However, some message queues support priority messaging. SolutionĪ queue is usually a first-in, first-out (FIFO) structure, and consumers typically receive messages in the same order that they were posted to the queue. These requests should be processed earlier than lower priority requests that were sent previously by the application.

In some cases, though, it's necessary to prioritize specific requests. In many cases, the order requests are received in by a service isn't important. In the cloud, a message queue is typically used to delegate tasks to background processing. Context and problemĪpplications can delegate specific tasks to other services, for example, to perform background processing or to integrate with other applications or services. This pattern is useful in applications that offer different service level guarantees to individual clients. Prioritize requests sent to services so that requests with a higher priority are received and processed more quickly than those with a lower priority.

Anylogic priority queue not working