Concord.StateMachine.Core (Concord v3.0.1)

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Protocol-independent deterministic Concord state machine.

This module owns all authoritative service data. It does not access ETS, clocks, processes, telemetry, storage, or a replication protocol.

Summary

Types

query_context()

Functions

apply(context, command, state)
init(opts \\ [])
query(query, state, context)
restore(entries)
snapshot(state)

Types

query_context()

@type query_context() ::
  %{timestamp_ms: non_neg_integer()} | Concord.StateMachine.Core.Context.t()

Functions

apply(context, command, state)

@spec apply(
  Concord.StateMachine.Core.Context.t(),
  term(),
  Concord.StateMachine.Core.State.t()
) ::
  {term(), Concord.StateMachine.Core.State.t()}

init(opts \\ [])

@spec init(keyword()) :: Concord.StateMachine.Core.State.t()

query(query, state, context)

@spec query(term(), Concord.StateMachine.Core.State.t(), query_context()) :: term()

restore(entries)

@spec restore(term()) :: {:ok, Concord.StateMachine.Core.State.t()} | {:error, term()}

snapshot(state)

@spec snapshot(Concord.StateMachine.Core.State.t()) :: {:ok, map()}