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Topic filters for Projections over gRPC #916

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patriknw opened this issue Jun 12, 2023 · 1 comment
Closed

Topic filters for Projections over gRPC #916

patriknw opened this issue Jun 12, 2023 · 1 comment
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patriknw commented Jun 12, 2023 •
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Subscription filters based on topic hierarchies and wildcards are very common. For example MQTT topics https://www.hivemq.com/blog/mqtt-essentials-part-5-mqtt-topics-best-practices/ or NATS topics https://docs.nats.io/nats-concepts/subjects

We could easily build this on top of the tag based filters. The events would be tagged with a prefix like t:myhome/groundfloor/livingroom/temerature unless we want to expand the api in EventSourcedBehavior.
Filters can be defined with a new topic filter (maybe just implemented on top of tag filters) which may contain wildcards that are matched when evaluating the filter criteria.

It would still only be for one specific entity type (stream id).
@patriknw patriknw self-assigned this Jun 30, 2023
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patriknw commented Jul 6, 2023

Implemented in #940

@patriknw patriknw closed this as completed Jul 6, 2023
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