Subscriptions
The Subscription defines which Event Handler will process all events produced by the appropriate Event Type. Multiple Event Handlers and/or multiple Event Types are possible on a Subscription.
Subscription 1 contains Event Type 1 and Event Handler 1 in the above diagram. Event Handler 1 will process all events produced by Event Type 1.
In the above diagram, Subscription 2 contains 2 Event Types and 2 Event Handlers. Each event from Event Type 2 or Event Type 3 will be processed by both Event Handler 2 and Event Handler 3. The same Event Type and Event Handler can be a part of multiple Subscriptions.