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* fix: prevent duplicate dispatcher creation race condition in invoke_global_service Concurrent coroutines could all pass the `if key in self.dispatchers` check before any of them wrote the result back, because `await dispatcher.start()` yields to the event loop. This caused multiple Pulsar consumers to be created on the same shared subscription, distributing responses round-robin and dropping ~2/3 of them — manifesting as a permanent spinner in the Workbench UI. Apply a double-checked asyncio.Lock in both `invoke_global_service` and `invoke_flow_service` so only one dispatcher is ever created per service key. * test: add concurrent-dispatch tests for race condition fix Add asyncio.gather-based tests that verify invoke_global_service and invoke_flow_service create exactly one dispatcher under concurrent calls, preventing the duplicate Pulsar consumer bug. |
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| requirements.txt | ||