Real-world implementations of the Publish/Subscribe model

TIBCO is one of the pioneers that preached the Publish/Subscriber model during the time of centralized batch processing. The TIBCO approach changed the paradigm on the stock trading floor.

RSS Feeds use the Pub/Sub model; you subscribe to an RSS feed, to one or more forums on a discussions platform, or follow someone on Twitter--in each case, there is one publisher and multiple subscribers involved.

Companies like IBM build protocols like Message Queue Telemetry Transport (MQTT). Some example of products that are built on the Pub/Sub model:

• IBM MQ is one of the early deployers of the Pub/Sub model
• Websphere
• Wormhole Pub/Sub system from Facebook
• Google Cloud Pub/Sub

In the next section, we will look how Azure implements queues and Pub/Sub models.