public CacheGrain(
IOptions <CacheOptions> options,
ISystemClock clock,
[PersistentState("State", OutkeepProviderNames.OutkeepCache)] IPersistentState <CacheGrainState> state,
[PersistentState("Flags", OutkeepProviderNames.OutkeepCache)] IPersistentState <CacheGrainFlags> flags,
[WeakActivationState(OutkeepProviderNames.OutkeepMemoryResourceGovernor)] IWeakActivationState <ActivityState> activity)
{
_options = options?.Value ?? throw new ArgumentNullException(nameof(options));
_clock = clock ?? throw new ArgumentNullException(nameof(clock));
_state = state?.AsConflater() ?? throw new ArgumentNullException(nameof(state));
_flags = flags?.AsConflater() ?? throw new ArgumentNullException(nameof(flags));
_activity = activity ?? throw new ArgumentNullException(nameof(activity));
}