public IObservable <IChangeSet <T> > Run()
{
return(Observable.Create <IChangeSet <T> >(observer =>
{
Interlocked.Increment(ref _refCount);
if (Volatile.Read(ref _refCount) == 1)
{
Interlocked.Exchange(ref _list, _source.AsObservableList());
}
// ReSharper disable once PossibleNullReferenceException (never the case!)
var subscriber = _list.Connect().SubscribeSafe(observer);
return Disposable.Create(() =>
{
Interlocked.Decrement(ref _refCount);
subscriber.Dispose();
if (Volatile.Read(ref _refCount) != 0)
{
return;
}
_list.Dispose();
Interlocked.Exchange(ref _list, null);
});
}));
}
public IObservable <IChangeSet <TObject, TKey> > Run()
{
return(Observable.Create <IChangeSet <TObject, TKey> >(observer =>
{
lock (_locker)
if (++_refCount == 1)
{
_list = _source.AsObservableList();
}
var subscriber = _list.Or().SubscribeSafe(observer);
return Disposable.Create(() =>
{
subscriber.Dispose();
IDisposable listToDispose = null;
lock (_locker)
if (--_refCount == 0)
{
listToDispose = _list;
_list = null;
}
listToDispose?.Dispose();
});
}));
}
public void Cast()
{
//take any list
var people = new SourceList <Person>();
//convert to dynamic
dynamic dyn = people;
//do a little magic
IObservable <IChangeSet <object> > objectChanges = Converter.AsObjectList(dyn);
IObservableList <object> myList = objectChanges.AsObservableList();
}
public IObservable <IChangeSet <T> > Run()
{
int refCount = 0;
var locker = new object();
IObservableList <T> list = null;
return(Observable.Create <IChangeSet <T> >(observer =>
{
lock (locker)
{
refCount++;
if (refCount == 1)
{
list = _source.AsObservableList();
}
// ReSharper disable once PossibleNullReferenceException (never the case!)
var subscriber = list.Connect().SubscribeSafe(observer);
return Disposable.Create(() =>
{
lock (locker)
{
refCount--;
subscriber.Dispose();
if (refCount != 0)
{
return;
}
list.Dispose();
list = null;
}
});
}
}));
}
public async Task TestFilterOnProperty()
{
var listA = new SourceList <X>();
var listB = new SourceList <X>();
using (IObservableList <X> list = listA.Connect()
.Or(listB.Connect())
.AsObservableList())
{
var nameA1 = "A1";
var a1 = new X(nameA1);
var a2 = new X("A2");
listA.Edit(l =>
{
l.Clear();
l.Add(a1);
l.Add(a2);
});
var b1 = new X("B1");
var b2 = new X("B2");
listB.Edit(l =>
{
l.Clear();
l.Add(b1);
l.Add(b2);
});
Assert.AreEqual(4, list.Count);
int count = await list.CountChanged.FirstAsync();
Assert.AreEqual(4, count);
IObservable <IChangeSet <X> > obsFiltered = list.Connect()
.FilterOnProperty(v => v.IsConnected, v => v.IsConnected);
using (IObservableList <X> obsFilteredAsList = obsFiltered.AsObservableList())
{
IObservable <IChangeSet <XVm> > obsTransformed = obsFiltered
.Transform(v => new XVm(v))
.DisposeMany();
var ctorCount = 0;
var dtorCount = 0;
using (IObservableList <XVm> obsTransformedAsList = obsTransformed.AsObservableList())
{
ctorCount += 4;
Assert.That(obsFilteredAsList.Items.Contains(a1));
Assert.That(obsFilteredAsList.Items.Count(), Is.EqualTo(obsTransformedAsList.Items.Count()));
a1.IsConnected = false;
Assert.That(obsFilteredAsList.Items, Has.No.Member(a1));
dtorCount++;
Assert.That(XVm.Constructed, Is.EqualTo(ctorCount));
Assert.That(XVm.Destructed, Is.EqualTo(dtorCount));
a1.IsConnected = true;
Assert.That(obsFilteredAsList.Items, Has.Member(a1));
ctorCount++;
Assert.That(XVm.Constructed, Is.EqualTo(ctorCount));
Assert.That(XVm.Destructed, Is.EqualTo(dtorCount));
Console.WriteLine("--remove");
listA.Remove(a1);
dtorCount++;
Assert.That(XVm.Constructed, Is.EqualTo(ctorCount));
Assert.That(XVm.Destructed, Is.EqualTo(dtorCount));
Console.WriteLine("--add");
listA.Add(a1);
ctorCount++;
Assert.That(XVm.Constructed, Is.EqualTo(ctorCount));
Assert.That(XVm.Destructed, Is.EqualTo(dtorCount));
Console.WriteLine("--clear");
listA.Clear();
dtorCount += 2; //FIX: List A contains 2 items (was adding 4)
Assert.That(XVm.Constructed, Is.EqualTo(ctorCount));
Assert.That(XVm.Destructed, Is.EqualTo(dtorCount));
Console.WriteLine("--add");
//FIX: Maybe a debate required! List B already contains b1, so not regarded as a new item in the Or result
Debug.Assert(listB.Items.Contains(b1));
listA.Add(b1);
// ctorCount++;
Assert.That(XVm.Constructed, Is.EqualTo(ctorCount));
Assert.That(XVm.Destructed, Is.EqualTo(dtorCount));
Console.WriteLine("--disp");
}
dtorCount += 2; //FIX: Should be +3 s this is what
Assert.That(XVm.Constructed, Is.EqualTo(ctorCount));
Assert.That(XVm.Destructed, Is.EqualTo(dtorCount));
}
}
}
