Add event emitter, GIN index for tags and DCB with any append store - #342
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The event emitter is opt-in via subscription.event_emitter, because removing a subscription also removes its subscription stream from the event store. With a taggable store the PostgreSQLPlatformMiddleware is registered on the event store connection, so the GIN index for tags gets created. DCB now uses the configured store, so the in memory store can be used in tests as well.
DanielBadura
approved these changes
Oct 5, 2026
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This wires up a few event-sourcing 4.0 features that the bundle didn't support yet.
The event emitter can be enabled with
subscription.event_emitter. It registers theEventEmitterResolverand theRemoveSubscriptionStreamListeneron the engine's event dispatcher. It's opt-in because removing a subscription also deletes itssubscription_<id>stream from the event store, and it can't be combined with a read only store.With a
dbal_taggablestore thePostgreSQLPlatformMiddlewareis now registered on the event store connection, so the GIN index for the tags gets created on PostgreSQL. For aurlconnection this happens in theDbalConnectionFactory, for a doctrine connection likedoctrine.dbal.eventstore_connectionvia thedoctrine.middlewaretag. Any other connection service needs the middleware registered manually, which is mentioned in the docs.DCB now uses the configured store instead of the
TaggableDoctrineDbalStoredirectly. Since theInMemoryStoreimplementsAppendStoreas well, it can now be used in tests, and custom append stores work too. Onlydbal_streamis rejected.The lock file is updated to the latest event-sourcing 4.0.x, which contains the GIN index.