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So you are developing a core platform for your enterprise. Your platform becomes successful, you have more clients consuming your services. Some (most) will need some core data synchronized in their systems. You might start experiencing the following pains
- You might use a push mechanism to notify clients about an core element update (e.g. user or organisation data update). But what happens when a new client ist added? Well your core platform needs to be aware of it. This might imply code or configuration changes, new deployments etc. - ** it does not scale **
- If a client of the platform is not online the time the update notification is pushed, it will miss the update, which might lead to data inconsistency.
Pub/Subscribe to the rescue
Both issues are elegantly solved if you use a publish/subscribe mechanism. Your core platform, the publisher, will publish the update event to a message broker, that will be consumed by one or several clients, subscribers. See the diagram below for the 1000 words, worth of explanation: