Real World ZIO
summary
Builds a concurrent, lock‑free elevator controller for H&A Hotel using ZIO and shows it actually works in simulation: n elevators, infinite pickup queue, step every two seconds, and a dispatcher that assigns the best elevator. Uses Promise, Ref, Queue, ZIO for async state and scheduling, and solves races with STM retry (TRef transactions that wait and commit atomically). Demo runs movers and request handlers in parallel fibers and services requests without deadlocks or lost updates.
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chapters (4)
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