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90 lines (75 loc) · 2.4 KB
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//
// Prototype of async iterators using WaitForNextAsync/TryGetNext.
//
// bartde - February 2018
//
using System;
using System.Runtime.CompilerServices;
namespace AsyncIterators
{
public abstract class ObservableAsyncIterator<T, TIterable> : AsyncIterableBuilder<T, TIterable>, IObservable<T>, IDisposable
where TIterable : ObservableAsyncIterator<T, TIterable>
{
private int __initialThreadId;
private IObserver<T> __observer;
private int __state;
private bool __dispose;
protected ObservableAsyncIterator()
{
__initialThreadId = Environment.CurrentManagedThreadId;
}
public void Dispose() => __dispose = true;
public IDisposable Subscribe(IObserver<T> observer)
{
if (__observer == null && __initialThreadId == Environment.CurrentManagedThreadId)
{
return SubscribeCore(observer);
}
else
{
TIterable clone = Clone();
return clone.SubscribeCore(observer);
}
}
private IDisposable SubscribeCore(IObserver<T> observer)
{
__observer = observer;
Run();
return this;
}
private void Run()
{
while (true)
{
T result = TryMoveNext(__state, shouldBreak: __dispose, out var hasNext, out var nextState);
if (hasNext == null)
{
break;
}
else if (hasNext == true)
{
__observer.OnNext(result);
__state = nextState;
}
else
{
__observer.OnCompleted();
__state = nextState;
}
}
}
protected override void AwaitOnCompleted<TAwaiter>(int nextState, ref TAwaiter awaiter)
{
__state = nextState;
awaiter.OnCompleted(Run);
}
protected override void AwaitUnsafeOnCompleted<TAwaiter>(int nextState, ref TAwaiter awaiter)
{
__state = nextState;
awaiter.OnCompleted(Run);
}
protected override void OnDisposed() { }
protected override void OnDisposing() { }
protected override bool ShouldYieldReturn() => !__dispose;
}
}