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v1.2.0: startup validation, OpenTelemetry, scope-per-dispatch - #1
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…istrations; v1.2.0 - ValidateSwitchboard(): reports missing and duplicate handlers, and open behaviors that silently skip void requests (the IRequest<TResponse> constraint trap) - Built-in tracing and metrics via ActivitySource/Meter (no new dependency) - UseScopePerDispatch(): a DI scope per top-level Send/Publish, nested dispatches reuse it, with a callback to carry ambient state (Blazor Server) - Fix: AddSwitchboard called twice on the same assembly no longer registers handlers and behaviors twice - Tests for constrained behaviors; README documents all of the above
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Summary
ValidateSwitchboard(): startup validation that reports requests with no handler, requests with several, and open behaviors silently skipped for void requests because they're constrained toIRequest<TResponse>. It reads registrations only and never constructs a handler.Send/Publish/each notification handler, plusswitchboard.request.durationandswitchboard.notification.durationhistograms, viaActivitySource/Meter(no new dependency).UseScopePerDispatch(): a DI scope per top-level dispatch for Blazor Server. Nested dispatches reuse it, and a callback carries ambient state such as the current user.AddSwitchboardtwice on the same assembly no longer registers handlers and behaviors twice (notification handlers used to run twice).Test plan