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casino-gaming-system

slot and table floor management with player loyalty: SAS/G2S protocols, TITO vouchers, meter accounting, regulator reporting

Light & Wonder, IGT ADVANTAGE, Konami Synkros

SystemTechniques · 25Primitives · 95 casino-gaming-system 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.›Durable job queuedistributed · medium: Persisted tasks that workers lease for a visibility timeout, ack on success and retry with backoff; at-least-once execution that survives worker and queue crashes.›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.›Hot-standby redundancyembedded · medium: A second, always-current controller shadows the primary and takes over within a few cycles of silence; epochs stop the old primary from fighting back.›Payment state machinefinance · medium: Persisted state machine for a payment lifecycle (authorize, capture, void, refund) that treats timeouts as unknown, retries with the same key and applies webhooks idempotently.›Code signingsecurity · medium: Signing binaries/apps with certificate chains, entitlements, timestamping and notarizationCoverage-guided fuzzingsecurity · medium: Mutate inputs, run an instrumented target, and keep any input that reaches a new code edge; feedback turns blind guessing into incremental search.›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.›Health checkingsystems · low: Decide per backend whether to route to it using probes and real-traffic errors, with consecutive-count hysteresis, capped ejection and a panic fallback.›Csprngsecurity · low: OS-backed cryptographically secure random numbers (getrandom), and when a fast PRNG is not enoughPublish subscribe event bussystems · low: In-process or on-box topic bus decoupling producers and consumers with bounded queuesHdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesMessage sequence numbersdistributed · low: A per-stream counter on every message lets the receiver detect loss, duplicates and reordering, ack cheaply and resume after reconnect with "send from N".›Benefit accumulatorseconomics · low: Track deductible and out-of-pocket accumulators per member and plan year, applying them in order to split claims into plan and member sharesDouble-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.›Money 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.›Reconciliationfinance · low: Match internal ledger records against bank and processor statements by reference, then amount and date window; every unmatched or mismatched item becomes an exception.›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.›Resource usage accountinghardware-os · low: Cgroup/procfs/GPU counters sampled into per-workload usageSas g2s protocolsnetworking · low: Slot machine communication protocols SAS and G2S: polling, meters, events, vouchersTime decay scoringsearch-sort · low: Scoring items by recency with exponential decay or half-life, combined with relevanceMessage authentication codes (HMAC,…security · low: A keyed short tag proving a message is unmodified and came from a key holder; pick HMAC, CMAC, KMAC or a one-time polynomial MAC by what primitive you already have.›Mutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›+ 18 more techniques+ 79 more primitives

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