feat: state machine - #115
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…-once effects Trax.Effect.StateMachine is a pure, total snapshot state-machine engine — the C# half of a cross-language contract where snapshots are language-neutral JSON, illegal (state, context) pairs are unrepresentable, and guards/reducers are named code rather than serialized expressions. Every operation returns a typed result and never throws. Trax.Effect.StateMachine.Persistence adds a user-scoped jsonb store with app-managed optimistic concurrency, the FE-drives/BE-validates draft service (fast + guarded committed-state autosave, idempotent advance replay), and a generic exactly-once effect primitive: claim the intent before the effect, with a lease + fence token and a reclaim sweeper so a dead runner can't wedge a key and a revived one can't double-complete. SnapshotEffectRunner wires it so N concurrent sends deliver once and a crash-retry replays the receipt. Verified against real Postgres, including the exact concurrency counts and a fault-injection test for effect-ran-but-state-never-committed. The demo turnstile mutation trains live in the test project, out of any production-scanned assembly.
… guard branch) A 3-state, guard-branched checkout machine (Cart -> Review -> Paid) over a multi-key context, mirrored in C# and TypeScript and driven by one shared fixture set. This is the case the turnstile can't exercise: multi-key canonicalization (RFC 8785 ordinal key sort) is now proven on both engines via a shared wire-handoff, and the guarded Pay branch agrees across languages.
Fluent Machine authoring, generic stateMachine GraphQL mutations behind a machine registry, snapshot persistence with a lease and fence exactly-once effect runner, AddTraxStateMachines discovery, and a gated stress suite. Also adds a dependency-direction guard to the Meta suite.
Fluent Machine authoring, generic stateMachine GraphQL mutations behind a machine registry, snapshot persistence with a lease and fence exactly-once effect runner, AddTraxStateMachines discovery, and a gated stress suite. Also adds a dependency-direction guard to the Meta suite.
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This PR is included in version 1.44.0 |
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