Hands-On Software Engineering with Python

Message- queue-based

Message queue systems, such as RabbitMQ and the various cloud-based options, have several advantages going for them for certain types of applications. They generally allow pretty much any message format to be used, provided that it can be expressed as text, and they allow messages to remain in a pending state until they are explicitly retrieved and dealt with, keeping messages safe and ready to use until the final consumer of those messages is ready to consume them. By way of example, consider the following scenario:

1. Two users are sending messages to a service through a distributed queue that lives on the Message-Queue Server
2. User #1 sends their first message
3. The service receives and acts on that message, but may not ...