@callback admit(
  ExecutionPlane.Admission.Request.t(),
  keyword()
) ::
  {:ok, ExecutionPlane.Admission.Decision.t()}
  | {:error, ExecutionPlane.Admission.Rejection.t()}

@callback cancel(
  ExecutionPlane.ExecutionRef.t(),
  keyword()
) :: :ok | {:error, term()}

@callback describe(keyword()) ::
  {:ok, ExecutionPlane.Runtime.NodeDescriptor.t()} | {:error, term()}

@callback execute(
  ExecutionPlane.Admission.Request.t(),
  keyword()
) ::
  {:ok, ExecutionPlane.ExecutionResult.t()}
  | {:error, ExecutionPlane.ExecutionResult.t()}

@callback stream(
  ExecutionPlane.Admission.Request.t(),
  keyword()
) :: {:ok, Enumerable.t()} | {:error, ExecutionPlane.Admission.Rejection.t()}