public FingerprintService(IObservable <Unit> applicationActivated, FuncAsync <string> description, IScheduler dispatcher, IScheduler backgroundScheduler, bool fallbackOnPasscodeAuthentication = false)
{
applicationActivated.Validation().NotNull(nameof(applicationActivated));
description.Validation().NotNull(nameof(description));
dispatcher.Validation().NotNull(nameof(dispatcher));
backgroundScheduler.Validation().NotNull(nameof(backgroundScheduler));
_description = description;
_dispatcher = dispatcher;
_asyncLock = new AsyncLock();
_isSupported =
applicationActivated
.ObserveOn(backgroundScheduler)
.StartWith(backgroundScheduler, Unit.Default)
.Select(_ => CheckSupport())
.Replay(1, backgroundScheduler)
.RefCount();
_isEnabled =
_isSupported
.Select(isSupported => isSupported && CheckEnrollment())
.Replay(1, backgroundScheduler)
.RefCount();
_fallbackOnPasscodeAuthentication = fallbackOnPasscodeAuthentication;
}
