[#208] Add tenant-aware query handling to the multi-tenancy demo - #4852
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One question, two additions to Mateusz his comments. Other than that, looks fine to me. That one question is the sole thing blocking an approval though.
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My concerns will be addressed, hence I'm preemptively approving this pull request.
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Demonstrates the tenant-aware query handling from axoniq-framework#281 (axoniq-framework#208) in the multi-tenancy example.
Stacked on #4795, so the diff here is the four commits on top of it. Supersedes #4851, whose first commit is cherry-picked here with its author intact, rebased off
mainonto the pooled-streaming branch and with its duplicatedMultiTenantStreamingProcessorRestartConfigurationrename dropped.What it shows
The statistics slice gains a subscription query. Both tenants known at startup subscribe to their own statistics before either enrolls a student, and
ReadModelWrites, already the one write both the projection and the command handler use, becomes the one place that emits updates and completes subscriptions.GetTenantStatisticsis an empty record, so the predicate handed to the emitter isquery -> trueand literally cannot name a tenant. The isolation is therefore the framework's, not the predicate's.