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restaurant-management

reservations, tables and kitchen display

OpenTable, Toast

SystemTechniques · 21Primitives · 76 restaurant-management Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Offline mutation queuedistributed · medium: Apply actions locally at once and queue them durably; on reconnect replay the queue idempotently, then re-apply unconfirmed ones on the server state.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›Pub/sub fan-outdistributed · medium: Deliver one published message to every subscriber of a topic by sharing one encoded payload and giving each connection a bounded queue with an explicit slow-consumer policy.›Inventory reservationfinance · medium: Reserving stock with TTL holds, release on timeout and no overselling under contentionStand in processingfinance · medium: Network stand-in authorization when an issuer is unreachable, with limits and later adviceAssignment problem (Hungarian / Jon…graphs · medium: Optimal one-to-one matching of rows to columns in O(n³) by growing a matching along shortest augmenting paths over dual potentials.›Idempotency keysfinance · low: Client-chosen unique key per logical operation, stored with a request fingerprint and the final response, so retries replay the first result instead of acting twice.›Emv cryptogramsfinance · low: EMV ARQC/ARPC and tokenized-card cryptograms: session key derivation and MAC verificationHdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesPriority waterfall allocationeconomics · low: Applying incoming payments to fees, interest and principal in a defined priority orderDouble-entry ledgerfinance · low: Append-only journal of transactions whose postings sum to zero per currency; balances are derived, so money can only move, never appear or vanish.›Dukpt key derivationfinance · low: DUKPT per-transaction key derivation for PIN pads and card readersFifo lot consumptionfinance · low: Consuming quantities from dated lots in FIFO/FEFO order (points expiry, stock rotation)Largest remainder roundingfinance · low: Splitting an amount into parts that sum exactly (largest remainder / Hamilton) for allocations, splits and prorationsMoney representationfinance · low: Store money as integer minor units with an explicit currency exponent, compute in wider integers, and round once with a named rounding mode.›Process supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›Sms encoding segmentationnetworking · low: GSM-7/UCS-2 encoding and concatenated SMS segmentation with UDHWebSocketsnetworking · low: Full-duplex message framing over one upgraded HTTP connection; the standard way to push real-time data to browsers.›Mutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Graceful drainingsystems · low: On a termination signal, stop taking new work, finish in-flight work until a deadline, tell clients to reconnect elsewhere, then exit; clients resume from a token.›Hierarchical state machinesystems · low: Nest states so a substate inherits its parent's reactions and only overrides what differs, with ordered entry and exit actions along the path.›Cooperative schedulingconcurrency · low: Green threads/coroutines yielding at await points on a user-space scheduler+ 14 more techniques+ 60 more primitives

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