wgaffa
commented
2 years ago - Type: a string, defined by the application.
- Stream: the stream the event belongs to, controlled by the applications.
- Id: a string, unique over the store, either supplied by the application or the server, most of the time this is some sort of UUID.
- Revision: a number representing the position in the specific instance stream this event is part of.
- Positions: Numbers representing the global position of the event in the different levels of the stream structure.
- Data: the payload of the events, no assumptions should be made on the data format, it could be JSON, byte arrays, XML,...
- Metadata: should have a clear distinction between the system reserved metadata and client-supplied metadata.
- System Metadata
- Timestamp: the date and time when the event was appended to the store, controlled by the database.
- CorrelationId: supplied by the application.
- CausationId: supplied by the application.
- Application Metadata: any application-level metadata, no assumptions should be made on the data format.