Publish-Subscribe messaging (or pub/sub messaging) is an asynchronous one-to-many communication model that makes it easy for services to subscribe to events, and for publishers to communicate with its subscribers.
The pub/sub messaging model has four key components:
- Messages: pieces of information sent from sender to receiver. The data can be anything from strings or numbers to complex objects representing a video, audio or other digital content;
- Topics: each message has a topic associated, which is useful for the receivers to only subscribe to a messages that belong to certain topics;
- Subscribers: they are receivers which registered to topics of interest.
- Publishers: they are the components which actually send the message. They create a message with a topic attatched and send it only once to all subscribers of that topic.
Note
It follows the same principles as the Pub-Sub Design Pattern in coding, and so publishers don’t need to know who the subscribers are, and vice versa.
Features
#todo: take them from here: What is Pub/Sub Messaging?
#software/cloud resources: