feat: Add Competing-Consumer Work Queue with Acks - #2
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WorkQueue delivers each message to one consumer, with prefetch, ack/nack requeue, and cancel redelivery for unacked work.
Deliver each message id at most once per pump round and drop after maxDeliveryCount. Adds hang and nack-to-tail regression tests.
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Summary
Adds an in-memory
WorkQueuewith competing consumers, prefetch, ack/nack, cancel requeue, and cursor round-robin. Each message goes to exactly one consumer.Redelivery is bounded: each message id is delivered at most once per pump round, and
maxDeliveryCount(default 10) drops permanent failures so a sync always-nack / always-throw / poison payload cannot busy-spin insideenqueue. Nack requeues to the tail so other ready work is not starved; cancel requeues unacked work at the head. Handler throw is treated as a requeueing nack.Test plan
pnpm run typecheckpnpm test(competing consumers, prefetch, ack/nack, cancel, hang bounds, nack-to-tail order)pnpm run build