public void LetsSeeWhetherWeCanRandomlyHitARaceCondition()
{
var ids = ObservableChangeSet.Create <long, long>(sourceCache => { return(Observable.Range(1, 1000000, Scheduler.Default).Subscribe(x => sourceCache.AddOrUpdate(x))); }, x => x);
var itemsCache = new SourceCache <Thing, long>(x => x.Id);
itemsCache.AddOrUpdate(
new[]
{
new Thing {
Id = 300, Name = "Quick"
},
new Thing {
Id = 600, Name = "Brown"
},
new Thing {
Id = 900, Name = "Fox"
},
new Thing {
Id = 1200, Name = "Hello"
},
});
ids.InnerJoin(itemsCache.Connect(), x => x.Id, (_, thing) => thing).Subscribe((z) => { }, ex => { }, () => { });
}
public void LoadsAndDisposeFromObservableCache()
{
bool isDisposed = false;
var observable = ObservableChangeSet.Create <Person, string>(cache => { return(() => { isDisposed = true; }); }, p => p.Name);
observable.AsObservableCache().Dispose();
isDisposed.Should().BeTrue();
}
public static IObservable <IChangeSet <int> > FromTask(Func <Task <IEnumerable <int> > > loader)
{
return(ObservableChangeSet.Create <int>(async list =>
{
var items = await loader();
list.AddRange(items);
return () => { };
}));
}
/// <summary>
/// Create an observable change set from a task
/// </summary>
/// <returns></returns>
public static IObservable <IChangeSet <int> > FromTask()
{
return(ObservableChangeSet.Create <int>(async list =>
{
var items = await LoadFromTask();
list.AddRange(items);
return () => { };
}));
}
public static ViewModel.InteractiveCollectionViewModel <T, object> Build <T>(Func <T, object> getkey, IObservable <IEnumerable <T> > elems, IObservable <IFilter> filter, IObservable <T> DeletedSubject, IObservable <object> ClearedSubject, System.Reactive.Concurrency.DispatcherScheduler UI, IObservable <Func <T, object> > getkeys = null, bool isReadOnly = false)
{
var dx = Observable.Create <string>(_ => () => { });
ViewModel.InteractiveCollectionViewModel <T, object> interactivecollection = null;
ISubject <Exception> exs = new Subject <Exception>();
var sx = ObservableChangeSet.Create(cache =>
{
var dels = DeletedSubject /*.WithLatestFrom(RemoveSubject.StartWith(Remove).DistinctUntilChanged(), (d, r) => new { d, r })*/.Subscribe(_ =>
{
try
{
cache.Remove(_);
}
catch (Exception ex)
{
Console.WriteLine("error removing " + _.ToString() + " from cache");
Console.WriteLine(ex.Message);
exs.OnNext(ex);
//ArgumentNullException
}
});
ClearedSubject.Subscribe(_ => cache.Clear());
elems.Subscribe(_ =>
{
foreach (var g in _)
{
try
{
cache.AddOrUpdate(g);
}
catch (Exception ex)
{
Console.WriteLine("error adding " + g.ToString() + " from cache");
Console.WriteLine(ex);
exs.OnNext(ex);
}
}
});
return(new System.Reactive.Disposables.CompositeDisposable(dels));
}, getkey)
.Filter(filter.Select(_ => { Func <T, bool> f = aa => _.Filter(aa); return(f); }).StartWith(ft));
getkeys?.Subscribe(_ =>
{
sx.ChangeKey(_);
});
interactivecollection = new ViewModel.InteractiveCollectionViewModel <T, object>(sx, UI, DeletedSubject, _ => (IConvertible)getkey(_));
exs.Subscribe(ex =>
(interactivecollection.Errors as System.Reactive.Subjects.ISubject <Exception>).OnNext(ex));
return(interactivecollection);
}
/// <summary>
/// Converts this directory's incoming change observables into a
/// single <see cref="IChangeSet{DirectoryEntry}" /> observable.
/// <para>
/// This observer is then used to feed <see cref="Files" />,
/// which in turn feeds the UI view of the directory contents.
/// </para>
/// </summary>
/// <returns>
/// An observable that reports changes in a directory in the form
/// of <see cref="IChangeSet{DirectoryEntry}" /> objects.
/// </returns>
private IObservable <IChangeSet <DirectoryEntry> > DirectoryChanges()
{
return(ObservableChangeSet.Create <DirectoryEntry>(list =>
{
var adder = ThisDirectoryFileAdd.Subscribe(x =>
list.Insert((int)x.Index, new DirectoryEntry(x.DirectoryId, x.Description)));
var clearer = ThisDirectoryPrepare.Subscribe(_ => list.Clear());
return new CompositeDisposable(adder, clearer);
}));
}
/// <summary>
/// Reload data and maintain list using edit diff which calculates a diff set from the previous load which can significantly reduce noise by poreventing
/// unnecessary updates
/// </summary>
public static IObservable <IChangeSet <int> > ReloadableWithEditDiff(IObservable <Unit> loadObservable, Func <Task <IEnumerable <int> > > loader)
{
return(ObservableChangeSet.Create <int>(list =>
{
return loadObservable
.StartWith(Unit.Default) //ensure inital load
.SelectMany(_ => loader())
.Subscribe(items => list.EditDiff(items, EqualityComparer <int> .Default));
}));
}
public void Create()
{
Task <T> CreateTask <T>(T value) => Task.FromResult(value);
SubscribeAndAssert(ObservableChangeSet.Create <int>(async list =>
{
var value = await CreateTask <int>(10);
list.Add(value);
return(() => { });
}));
}
public LocalLibraryService(
ITracksRepository tracksRepository,
ITrackFactory trackFactory,
IPlaylistsRepository playlistsRepository,
IPlaylistFactory playlistFactory)
{
this._tracksRepository = tracksRepository ?? throw new ArgumentNullException(nameof(tracksRepository));
this._trackFactory = trackFactory ?? throw new ArgumentNullException(nameof(trackFactory));
this._playlistsRepository = playlistsRepository ?? throw new ArgumentNullException(nameof(playlistsRepository));
this._playlistFactory = playlistFactory ?? throw new ArgumentNullException(nameof(playlistFactory));
this._playlistBaseChangesSubscription = new SerialDisposable().DisposeWith(this._disposables);
this._tracksChangesSubscription = new SerialDisposable().DisposeWith(this._disposables);
this.TracksChanges = ObservableChangeSet.Create <Track, uint>(
async cache =>
{
var items = await this._tracksRepository.GetAllAsync();
cache.AddOrUpdate(items);
//return new CompositeDisposable(
// //this._tracksRepository.TracksAddeded.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.AddOrUpdate(addedItems))),
// //this._tracksRepository.TracksRemoved.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.Remove(addedItems))),
// //this._tracksRepository.TracksUpdated.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.AddOrUpdate(addedItems)))
// );
},
x => x.Id)
// TODO: add synchronization to handle multiple subscriptions?
.RefCount()
//.Multicast(new ReplaySubject<IChangeSet<Track, uint>>())
//.AutoConnect(1, subscription => this._tracksChangesSubscription.Disposable = subscription)
;
this.PlaylistsChanges = ObservableChangeSet.Create <PlaylistBase, uint>(
async cache =>
{
var items = await this._playlistsRepository.GetAllPlaylistsAsync();
cache.AddOrUpdate(items);
//return new CompositeDisposable(
//// this._playlistsRepository.Addeded.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.AddOrUpdate(addedItems))),
//// this._playlistsRepository.Removed.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.Remove(addedItems))),
//// this._playlistsRepository.Updated.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.AddOrUpdate(addedItems)))
//);
},
x => x.Id)
.RefCount()
//.Multicast(new ReplaySubject<IChangeSet<PlaylistBase, uint>>())
//.AutoConnect(1, subscription => this._playlistBaseChangesSubscription.Disposable = subscription)
;
}
public void LoadsAndDisposeUsingDisposable()
{
bool isDisposed = false;
SubscribeAndAssert(ObservableChangeSet.Create <Person, string>(cache =>
{
Person[] people = Enumerable.Range(1, 100).Select(i => new Person($"Name.{i}", i)).ToArray();
cache.AddOrUpdate(people);
return(Disposable.Create(() => { isDisposed = true; }));
}, p => p.Name),
checkContentAction: result => result.Count.Should().Be(100));
isDisposed.Should().BeTrue();
}
/// <summary>
/// Create an observable change set from 2 observables i) the initial load 2) a subscriber
/// </summary>
public static IObservable <IChangeSet <int> > FromObservable(IObservable <IEnumerable <int> > initialLoad, IObservable <int> subscriptions)
{
return(ObservableChangeSet.Create <int>(list =>
{
//in an enterprise app, would have to account for the gap between load and subscribe
var initialSubscriber = initialLoad
.Take(1)
.Subscribe(list.AddRange);
var subscriber = subscriptions
.Subscribe(list.Add);
return new CompositeDisposable(initialSubscriber, subscriber);
}));
}
public void LoadsAndDisposeUsingActionAsync()
{
Task <Person[]> CreateTask() => Task.FromResult(Enumerable.Range(1, 100).Select(i => new Person($"Name.{i}", i)).ToArray());
bool isDisposed = false;
SubscribeAndAssert(ObservableChangeSet.Create <Person, string>(async cache =>
{
var people = await CreateTask();
cache.AddOrUpdate(people);
return(() => { isDisposed = true; });
}, p => p.Name),
checkContentAction: result => result.Count.Should().Be(100));
isDisposed.Should().BeTrue();
}
public TracksService(TracksRepository tracksRepository)
{
this._tracksRepository = tracksRepository ?? throw new ArgumentNullException(nameof(tracksRepository));
this.TracksChangeSets = ObservableChangeSet.Create <Track, uint>(
async sourceCache =>
{
var load = this._tracksRepository.GetAllAsync();
var delayedLoad = Task.WhenAll(load, Task.Delay(TimeSpan.FromSeconds(5)));
await delayedLoad;
var tracks = await load;
sourceCache.AddOrUpdate(tracks);
},
b => b.Id)
.RefCount();
}
public TrackViewModelsProxy()
{
this.TracksChangeSets = ObservableChangeSet.Create <Track, uint>(
async sourceCache =>
{
var tracks = await this.GetAllTracksAsync(
TimeSpan.FromSeconds(3)
);
sourceCache.AddOrUpdate(tracks);
},
x => x.Id)
.RefCount();
this.TrackViewModelsChangeSets = this.TracksChangeSets
.Transform(b => new TrackViewModel(b))
.DisposeMany()
.RefCount();
}
public LocalLibraryService(
ITracksRepository tracksRepository,
ITrackFactory trackFactory,
IPlaylistsRepository playlistsRepository,
IPlaylistFactory playlistFactory)
{
this._tracksRepository = tracksRepository ?? throw new ArgumentNullException(nameof(tracksRepository));
this._trackFactory = trackFactory ?? throw new ArgumentNullException(nameof(trackFactory));
this._playlistsRepository = playlistsRepository ?? throw new ArgumentNullException(nameof(playlistsRepository));
this._playlistFactory = playlistFactory ?? throw new ArgumentNullException(nameof(playlistFactory));
this.TracksChanges = ObservableChangeSet.Create <Track, uint>(
async cache =>
{
var items = await this.GetTracksAsync(
//TimeSpan.FromSeconds(3)
);
GC.Collect();
cache.AddOrUpdate(items);
GC.Collect();
//return new CompositeDisposable(
// this._tracksRepository.Addeded.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.AddOrUpdate(addedItems))),
// this._tracksRepository.Removed.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.Remove(addedItems))),
// this._tracksRepository.Updated.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.AddOrUpdate(addedItems))));
},
x => x.Id)
// TODO: add synchronization to handle multiple subscriptions?
.RefCount();
this.PlaylistsChanges = ObservableChangeSet.Create <PlaylistBase, uint>(
async cache =>
{
var items = await this._playlistsRepository.GetAllPlaylistsAsync();
cache.AddOrUpdate(items);
//return new CompositeDisposable(
// this._playlistsRepository.Addeded.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.AddOrUpdate(addedItems))),
// this._playlistsRepository.Removed.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.Remove(addedItems))),
// this._playlistsRepository.Updated.Subscribe(addedItems => cache.Edit(cacheUpdater => cacheUpdater.AddOrUpdate(addedItems))));
},
x => x.Id)
.RefCount();
}
public ConnectionService()
{
mServerDiscovery = new ServerDiscovery();
AvailableServers = ObservableChangeSet.Create <Server, int>(list =>
{
return(Observable.Interval(TimeSpan.FromSeconds(1))
.StartWith(0)
.Select(_ => mServerDiscovery.Scan())
.Subscribe(servers => list.EditDiff(servers, (s1, s2) => s1.ProcessId == s2.ProcessId)));
}, server => server.ProcessId);
mConnectionSubject = new BehaviorSubject <IConnectionModel>(null);
mProfilersLocation =
Path.Combine(
Path.GetDirectoryName(
new Uri(Assembly.GetEntryAssembly().CodeBase).LocalPath),
"profiler");
}
public void HandlesAsyncError()
{
Exception error = null;
Task <IEnumerable <Person> > Loader()
{
throw new Exception("Broken");
}
var observable = ObservableChangeSet.Create <Person, string>(async cache =>
{
var people = await Loader();
cache.AddOrUpdate(people);
return(() => { });
}, p => p.Name);
using (var dervived = observable.AsObservableCache())
using (dervived.Connect().Subscribe(_ => { }, ex => error = ex))
{
error.Should().NotBeNull();
}
}
public virtual ViewModel.InteractiveCollectionViewModel <object, IConvertible> React(/*string key,*/ string childrenpath, IEnumerable enumerable, IObservable <bool> ischecked, System.Reactive.Concurrency.DispatcherScheduler UI, System.Windows.Threading.Dispatcher dispatcher)
{
var sx = ObservableChangeSet.Create <object, IConvertible>(cache =>
{
foreach (var val in enumerable)
{
cache.AddOrUpdate(val);
}
return(System.Reactive.Disposables.Disposable.Empty);
}, GetKey);
var kx = new ViewModel.InteractiveCollectionViewModel <object, IConvertible>(sx, ChildrenPath, ischecked, ExpandSubject.StartWith(Expand).DistinctUntilChanged(), UI, dispatcher);
kx.GetChecked();
kx.GetSelectedItem(ischecked).Subscribe(_ =>
{
this.Dispatcher.InvokeAsync(() => SelectedItem = _, System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
});
kx.GetCheckedChildItems(ischecked, childrenpath).Subscribe(_ =>
{
this.Dispatcher.InvokeAsync(() => CheckedItems = _, System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
});
AllCheckedItems = kx.@checked;
//kx.GetSelected().WithLatestFrom(ischecked,(a,b)=>new { a, b }).Subscribe(_=>
//{
// if (@checked.Contains(_) || _.b==false)
// {
// this.Dispatcher.InvokeAsync(() => SelectedItem = _.a, System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
// this.Dispatcher.InvokeAsync(() => CheckedItems = ReflectionHelper.RecursivePropValues(_.a, childrenpath).Cast<object>().Where(a => @checked.Contains(a)).ToList(), System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
// }
//});
//kx.ChildSubject.Where(_=>_.Value.Interaction==Interaction.Select &&((int) _.Value.Value)>0).WithLatestFrom(ischecked, (a, b) => new { a, b }).Subscribe(_ =>
//{
// if (@checked.Contains(_.a.Key) || _.b == false)
// {
// this.Dispatcher.InvokeAsync(() => SelectedItem = _.a.Key, System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
// this.Dispatcher.InvokeAsync(() => CheckedItems = ReflectionHelper.RecursivePropValues(_.a.Key, childrenpath).Cast<object>().Where(a => @checked.Contains(a)).ToList(), System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
// }
//});
//kx.ChildSubject.Where(_ => _.Value.Interaction == Interaction.Check).Subscribe(_ =>
//{
// if (!((bool)_.Value.Value))
// if (@checked.Contains(_.Key))
// {
// @checked.Remove(_.Key);
// this.Dispatcher.InvokeAsync(() => SelectedItem = null, System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
// this.Dispatcher.InvokeAsync(() => CheckedItems = null, System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
// }
// else if (((bool)_.Value.Value))
// if (@unchecked.Contains(_.Key))
// {
// @unchecked.Remove(_.Key);
// this.Dispatcher.InvokeAsync(() => SelectedItem = _.Key, System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
// this.Dispatcher.InvokeAsync(() => CheckedItems = ReflectionHelper.RecursivePropValues(_.Key, childrenpath).Cast<object>().Where(a => @checked.Contains(a)).ToList(), System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
// }
//});
//kx.DoubleClicked.Subscribe(_ =>
//{
// this.Dispatcher.InvokeAsync(() => DoubleClickedItem = _, System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
//});
//SelectedItemSubject.Subscribe(_ =>
//kx.Deleted.Subscribe(_ =>
//{
// this.Dispatcher.InvokeAsync(() => Deleted = _, System.Windows.Threading.DispatcherPriority.Background, default(System.Threading.CancellationToken));
//});
return(kx);
}
public LocalSuppliersService(
IBillingUnitOfWorkFactory _billingUnitOfWorkFactory
)
{
this._billingUnitOfWorkFactory = _billingUnitOfWorkFactory ?? throw new ArgumentNullException(nameof(_billingUnitOfWorkFactory));
this._added_Subject = new Subject <SupplierDto>().DisposeWith(this._disposables);
this._updated_Subject = new Subject <IReadOnlyCollection <SupplierDto> >().DisposeWith(this._disposables);
this._removed_Subject = new Subject <IReadOnlyCollection <long> >().DisposeWith(this._disposables);
//this._isBusy_BehaveiorSubject = new BehaviorSubject<bool>(false).DisposeWith(this._disposables);
//this.IsBusyChanged = this._isBusy_BehaveiorSubject.DistinctUntilChanged();
this._suppliersChangesSubscription = new SerialDisposable().DisposeWith(this._disposables);
var supplierDtoChangeSets = ObservableChangeSet.Create <SupplierDto, long>(
async cache =>
{
//await Task.Delay(3_000);
var supplierDTOs = await this.GetAllAsync().ConfigureAwait(false);
cache.AddOrUpdate(supplierDTOs);
var crudSubscriptions = new CompositeDisposable();
this.Added
.Subscribe(supplierDto => cache.Edit(cacheUpdater => cacheUpdater.AddOrUpdate(supplierDto)))
.DisposeWith(crudSubscriptions);
this.Updated
.Subscribe(e =>
{
cache.Edit(cacheUpdater =>
{
var updates = e
.Select(
updatedSupplierDto =>
{
var oldVersion = cacheUpdater.Lookup(updatedSupplierDto.Id);
return(new Change <SupplierDto, long>(
ChangeReason.Update,
updatedSupplierDto.Id,
updatedSupplierDto,
oldVersion));
})
.ToArray();
var changes = new ChangeSet <SupplierDto, long>(updates);
cacheUpdater.Clone(changes);
});
})
.DisposeWith(crudSubscriptions);
this.Removed
.Subscribe(e => cache.Edit(cacheUpdater => cacheUpdater.Remove(e)))
.DisposeWith(crudSubscriptions);
return(crudSubscriptions);
},
x => x.Id)
//this.SuppliersChanges = supplierDtoChangeSets
// //.RefCount()
// //.Transform(supplier => this._supplierViewModelFactoryMethod.Invoke(supplier), new ParallelisationOptions(ParallelType.Parallelise))
// //.DisposeMany()
// .Sort(SortExpressionComparer<SupplierDto>.Ascending(vm => vm.Name))
//.Multicast(new ReplaySubject<IChangeSet<SupplierDto, int>>())
//.AutoConnect(1, subscription => this._suppliersChangesSubscription.Disposable = subscription)
;
this.Suppliers = supplierDtoChangeSets
//.Sort(SortExpressionComparer<SupplierDto>.Ascending(vm => vm.Name))
.RefCount()
.AsObservableCache(); // applyLocking: false);
}
