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aircraft-mro

aviation maintenance, repair and overhaul suite

Swiss-AS AMOS, Ramco Aviation, Trax

SystemTechniques · 27Primitives · 88 aircraft-mro 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 workflow executiondistributed · medium: Ordinary code made crash-proof by logging every side-effect result and replaying the code from that log; activities run at least once, workflow logic must be deterministic.›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.›Inventory reservationfinance · medium: Reserving stock with TTL holds, release on timeout and no overselling under contentionBill of materials explosionoptimization · medium: MRP netting: explode BOMs level by level with lead-time offsetting into planned ordersInventory policies safety stockoptimization · medium: (s,S), base-stock, EOQ and newsvendor policies with safety stock from demand uncertaintyOptimistic concurrency controlstorage · low: Run transactions without locks, record what they read, and validate at commit that nothing changed; fastest when conflicts are rare.›Topological sortgraphs · low: Order the vertices of a DAG so every edge points forward; the core of build systems, schedulers and dependency resolution, with cycle detection for free.›Calendar date arithmeticsystems · low: Civil dates, time zones (tzdb), DST gaps, month-end anchoring and duration mathCroston methodstatistics · low: Forecasting intermittent demand by separately smoothing demand sizes and intervals (Croston, SBA, TSB)Barcode symbologiesdata-structures · low: Encode/decode 1D and 2D barcodes (Code 128, DataMatrix, QR) with their error correctionHdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesLife limited part trackingembedded · low: Track installed serialised parts per position with life limits in hours/cycles/calendar; remaining life is the earliest limit, carried across removalsFifo lot consumptionfinance · low: Consuming quantities from dated lots in FIFO/FEFO order (points expiry, stock rotation)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.›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.›Mutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Row-level security (multi-tenant is…security · low: Append a policy predicate to every query inside the database, so a forgotten WHERE tenant_id = ? in application code cannot leak another tenant's rows.›Closure tablestorage · low: Storing trees and hierarchies in relational tables (closure table, materialized path) for fast subtree queriesGapless sequence numbersstorage · low: Gap-free, monotonic numbering (invoices, journal entries) under concurrency and rollbacksGraceful 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.›+ 20 more techniques+ 72 more primitives

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