Messaging Pattern

Fanout

In fanout pattern, many interested parties will bind (a.k.a, subscribe) to a given topic.

When a message is sent to the topic, all subscribers will receive a copy of the message sent to the topic. The message is “fanned out.”

So ROS calls itself Pub-Sub when really it is fanout.

• Source: https://www.redhat.com/architect/architectural-messaging-patterns

Twitter is a good example of the Fanout pattern. One single tweet is sent to all the parties following the person sending the tweet.