public AppUserModelService(IUserApiService userApiService, ILogger logger, IAppSettings appSettings)
{
_favouriteCakes = new SourceCache <CakeDto, int>(c => c.Id);
_appSettings = appSettings;
_userIdSubject = new BehaviorSubject <string>(String.Empty);
_userSubject = new BehaviorSubject <UserDto>(null);
_cd = new CompositeDisposable();
_favouriteCakes
.Connect()
.CacheChangeSet(CacheKey, logger)
.Subscribe();
_userIdSubject
.ObserveOn(RxApp.TaskpoolScheduler)
.Where(u => u != null)
.SelectMany(async uId => await userApiService.GetFavourites(uId))
.RetryWithBackoff(3)
.LogException(logger)
.Subscribe(cakes =>
{
_favouriteCakes.Edit(l => l.AddOrUpdate(cakes));
})
.DisposeWith(_cd);
Observable.FromAsync(async() => await _favouriteCakes.FromCache(CacheKey, EqualityComparer <CakeDto> .Default)).Subscribe().DisposeWith(_cd);
}