CostCalculator

A cost calculator observes one source ModelElement and produces one or more line-item Responses populated at the source's REPLICATION_ENDED notification.

Implementation pattern (canonical shape — see Phase 3's concrete calculators):

1. Declare the source as a constructor parameter; read any other context the calculator needs from the source's public surface (e.g., inv.itemType) — no redundant arguments.

2. Allocate one Response per line item the calculator produces, exposing them via lineResponses.

3. Declare an inner-class ksl.observers.ModelElementObserver whose replicationEnded(modelElement) reads the source's stabilized within-replication statistics and writes the line-item values.

4. Call source.attachModelElementObserver(...) in the init block.

Once attached, the calculator's observer fires automatically at the moment the source's replicationEnded() completes — KSL guarantees the source's within-replication statistics are stable (and post-warmup) at that point. The calculator performs pure multiplication on those observables; the framework does no time-unit conversion and makes no presumption about a rate's time basis (see docs/supply-chain-cost-redesign.md §2 "Note on warmup handling" and §1 "Goals and non-goals").

See also

Inheritors