Struct TransactionFsm 

pub struct TransactionFsm;

Pure-logic FSM engine for TAP transactions.

This struct contains no I/O — it operates only on TransactionContext and returns Transition values describing what happened and what decisions are needed. The caller (typically the StandardTransactionProcessor or a higher-level orchestrator) is responsible for:

1. Persisting state changes
2. Publishing events
3. Presenting decisions to external systems
4. Sending response messages

Implementations

impl TransactionFsm

pub fn apply( ctx: &mut TransactionContext, event: FsmEvent, ) -> Result<Transition, InvalidTransition>

Apply an event to a transaction context, producing a state transition.

Returns Ok(Transition) on success, describing the state change and any decision required. Returns Err(InvalidTransition) if the event is not valid in the current state.

pub fn valid_events(state: &TransactionState) -> Vec<&'static str>

Returns all valid events for a given state (for documentation/UI).