What are Message Queue and Notification Worker used for?

Message Queue — is a system that allows asynchronous transmission of messages between application components or between different services. It helps to unload the main processes, ensuring reliable message delivery and simplifying scaling.

Notification Worker — is a separate component or service that listens to the message queue and processes notifications, such as sending emails, push notifications, or SMS. This approach allows separating the event generation logic from their processing and delivery, increasing system fault tolerance and performance.

Example of usage:

• The application places an event message into the queue.
• The Notification Worker receives the message from the queue and sends a notification to the user.

This allows not to block the main thread of the application and to process notifications in the background.