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The following interface pattern is similar to the notification interface pattern with the difference that, from the application system point of view, the sender and receiver are more strictly separated.

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A typical use case is the subscription to events that are expected later (publish/subscribe scenario).

It is uncertain for the sender in this system if the results are evualated by the receiver at all, and how. This can mean that many messages are sent in vain (broadcasting). SAP therefore recommends that you only use this interface pattern under exceptional circumstances. The following list gives some criteria for using this pattern:

  • There are multiple receivers that have subscribed to the same event. The event can trigger different operations for each receiver.

  • It is impossible for the sender to know whether the receiver is interested in that particular event, or not.

Do not use this interface pattern to distribute master data.