public DontForgetAboutSingleReponsibilityPrinciple(
Disposable dispo,
Foo foo,
Bar bar,
IFirst0 first0,
IFirst1 first1,
IFirst2 first2,
ISecond0 second0,
ISecond1 second1,
ISecond2 second2,
IThird0 third0,
IThird1 third1)
{
}
private static IAsyncEnumerable <TSource> Concat_ <TSource>(this IEnumerable <IAsyncEnumerable <TSource> > sources)
{
return(Create(() =>
{
var se = sources.GetEnumerator();
var e = default(IAsyncEnumerator <TSource>);
var cts = new CancellationTokenDisposable();
var a = new AssignableDisposable();
var d = Disposable.Create(cts, se, a);
var f = default(Action <TaskCompletionSource <bool>, CancellationToken>);
f = (tcs, ct) =>
{
if (e == null)
{
var b = false;
try
{
b = se.MoveNext();
if (b)
{
e = se.Current.GetEnumerator();
}
}
catch (Exception ex)
{
tcs.TrySetException(ex);
return;
}
if (!b)
{
tcs.TrySetResult(false);
return;
}
a.Disposable = e;
}
e.MoveNext(ct).Then(t =>
{
t.Handle(tcs, res =>
{
if (res)
{
tcs.TrySetResult(true);
}
else
{
e.Dispose();
e = null;
f(tcs, ct);
}
});
});
};
return Create(
(ct, tcs) =>
{
f(tcs, cts.Token);
return tcs.Task.UsingEnumerator(a);
},
() => e.Current,
d.Dispose
);
}));
}
public static IAsyncEnumerable <TResult> GroupJoin <TOuter, TInner, TKey, TResult>(this IAsyncEnumerable <TOuter> outer, IAsyncEnumerable <TInner> inner, Func <TOuter, TKey> outerKeySelector, Func <TInner, TKey> innerKeySelector, Func <TOuter, IAsyncEnumerable <TInner>, TResult> resultSelector, IEqualityComparer <TKey> comparer)
{
if (outer == null)
{
throw new ArgumentNullException("outer");
}
if (inner == null)
{
throw new ArgumentNullException("inner");
}
if (outerKeySelector == null)
{
throw new ArgumentNullException("outerKeySelector");
}
if (innerKeySelector == null)
{
throw new ArgumentNullException("innerKeySelector");
}
if (resultSelector == null)
{
throw new ArgumentNullException("resultSelector");
}
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
return(Create(() =>
{
var innerMap = default(Task <ILookup <TKey, TInner> >);
var getInnerMap = new Func <CancellationToken, Task <ILookup <TKey, TInner> > >(ct =>
{
if (innerMap == null)
{
innerMap = inner.ToLookup(innerKeySelector, comparer, ct);
}
return innerMap;
});
var outerE = outer.GetEnumerator();
var current = default(TResult);
var cts = new CancellationTokenDisposable();
var d = Disposable.Create(cts, outerE);
var f = default(Action <TaskCompletionSource <bool>, CancellationToken>);
f = (tcs, ct) =>
{
getInnerMap(ct).Then(ti =>
{
ti.Handle(tcs, map =>
{
outerE.MoveNext(ct).Then(to =>
{
to.Handle(tcs, res =>
{
if (res)
{
var element = outerE.Current;
var key = default(TKey);
try
{
key = outerKeySelector(element);
}
catch (Exception ex)
{
tcs.TrySetException(ex);
return;
}
var innerE = default(IAsyncEnumerable <TInner>);
if (!map.Contains(key))
{
innerE = AsyncEnumerable.Empty <TInner>();
}
else
{
innerE = map[key].ToAsyncEnumerable();
}
try
{
current = resultSelector(element, innerE);
}
catch (Exception ex)
{
tcs.TrySetException(ex);
return;
}
tcs.TrySetResult(true);
}
else
{
tcs.TrySetResult(false);
}
});
});
});
});
};
return Create(
(ct, tcs) =>
{
f(tcs, cts.Token);
return tcs.Task.UsingEnumerator(outerE);
},
() => current,
d.Dispose
);
}));
}
public static IAsyncEnumerable <TResult> Join <TOuter, TInner, TKey, TResult>(this IAsyncEnumerable <TOuter> outer, IAsyncEnumerable <TInner> inner, Func <TOuter, TKey> outerKeySelector, Func <TInner, TKey> innerKeySelector, Func <TOuter, TInner, TResult> resultSelector, IEqualityComparer <TKey> comparer)
{
if (outer == null)
{
throw new ArgumentNullException("outer");
}
if (inner == null)
{
throw new ArgumentNullException("inner");
}
if (outerKeySelector == null)
{
throw new ArgumentNullException("outerKeySelector");
}
if (innerKeySelector == null)
{
throw new ArgumentNullException("innerKeySelector");
}
if (resultSelector == null)
{
throw new ArgumentNullException("resultSelector");
}
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
return(Create(() =>
{
var oe = outer.GetEnumerator();
var ie = inner.GetEnumerator();
var cts = new CancellationTokenDisposable();
var d = Disposable.Create(cts, oe, ie);
var current = default(TResult);
var useOuter = true;
var outerMap = new Dictionary <TKey, List <TOuter> >(comparer);
var innerMap = new Dictionary <TKey, List <TInner> >(comparer);
var q = new Queue <TResult>();
var gate = new object();
var f = default(Action <TaskCompletionSource <bool>, CancellationToken>);
f = (tcs, ct) =>
{
if (q.Count > 0)
{
current = q.Dequeue();
tcs.TrySetResult(true);
return;
}
var b = useOuter;
if (ie == null && oe == null)
{
tcs.TrySetResult(false);
return;
}
else if (ie == null)
{
b = true;
}
else if (oe == null)
{
b = false;
}
useOuter = !useOuter;
var enqueue = new Func <TOuter, TInner, bool>((o, i) =>
{
var result = default(TResult);
try
{
result = resultSelector(o, i);
}
catch (Exception exception)
{
tcs.TrySetException(exception);
return false;
}
q.Enqueue(result);
return true;
});
if (b)
{
oe.MoveNext(ct).Then(t =>
{
t.Handle(tcs, res =>
{
if (res)
{
var element = oe.Current;
var key = default(TKey);
try
{
key = outerKeySelector(element);
}
catch (Exception exception)
{
tcs.TrySetException(exception);
return;
}
var outerList = default(List <TOuter>);
if (!outerMap.TryGetValue(key, out outerList))
{
outerList = new List <TOuter>();
outerMap.Add(key, outerList);
}
outerList.Add(element);
var innerList = default(List <TInner>);
if (!innerMap.TryGetValue(key, out innerList))
{
innerList = new List <TInner>();
innerMap.Add(key, innerList);
}
foreach (var v in innerList)
{
if (!enqueue(element, v))
{
return;
}
}
f(tcs, ct);
}
else
{
oe.Dispose();
oe = null;
f(tcs, ct);
}
});
});
}
else
{
ie.MoveNext(ct).Then(t =>
{
t.Handle(tcs, res =>
{
if (res)
{
var element = ie.Current;
var key = default(TKey);
try
{
key = innerKeySelector(element);
}
catch (Exception exception)
{
tcs.TrySetException(exception);
return;
}
var innerList = default(List <TInner>);
if (!innerMap.TryGetValue(key, out innerList))
{
innerList = new List <TInner>();
innerMap.Add(key, innerList);
}
innerList.Add(element);
var outerList = default(List <TOuter>);
if (!outerMap.TryGetValue(key, out outerList))
{
outerList = new List <TOuter>();
outerMap.Add(key, outerList);
}
foreach (var v in outerList)
{
if (!enqueue(v, element))
{
return;
}
}
f(tcs, ct);
}
else
{
ie.Dispose();
ie = null;
f(tcs, ct);
}
});
});
}
};
return Create(
(ct, tcs) =>
{
f(tcs, cts.Token);
return tcs.Task.UsingEnumerator(oe).UsingEnumerator(ie);
},
() => current,
d.Dispose
);
}));
}
public static IAsyncEnumerable <TSource> Intersect <TSource>(this IAsyncEnumerable <TSource> first, IAsyncEnumerable <TSource> second, IEqualityComparer <TSource> comparer)
{
if (first == null)
{
throw new ArgumentNullException("first");
}
if (second == null)
{
throw new ArgumentNullException("second");
}
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
return(Create(() =>
{
var e = first.GetEnumerator();
var cts = new CancellationTokenDisposable();
var d = Disposable.Create(cts, e);
var mapTask = default(Task <Dictionary <TSource, TSource> >);
var getMapTask = new Func <CancellationToken, Task <Dictionary <TSource, TSource> > >(ct =>
{
if (mapTask == null)
{
mapTask = second.ToDictionary(x => x, comparer, ct);
}
return mapTask;
});
var f = default(Action <TaskCompletionSource <bool>, CancellationToken>);
f = (tcs, ct) =>
{
e.MoveNext(ct).Zip(getMapTask(ct), (b, _) => b).Then(t =>
{
t.Handle(tcs, res =>
{
if (res)
{
if (mapTask.Result.ContainsKey(e.Current))
{
tcs.TrySetResult(true);
}
else
{
f(tcs, ct);
}
}
else
{
tcs.TrySetResult(false);
}
});
});
};
return Create(
(ct, tcs) =>
{
f(tcs, cts.Token);
return tcs.Task.UsingEnumerator(e);
},
() => e.Current,
d.Dispose
);
}));
}
public static IAsyncEnumerable <TSource> Concat <TSource>(this IAsyncEnumerable <TSource> first, IAsyncEnumerable <TSource> second)
{
if (first == null)
{
throw new ArgumentNullException("first");
}
if (second == null)
{
throw new ArgumentNullException("second");
}
return(Create(() =>
{
var switched = false;
var e = first.GetEnumerator();
var cts = new CancellationTokenDisposable();
var a = new AssignableDisposable {
Disposable = e
};
var d = Disposable.Create(cts, a);
var f = default(Action <TaskCompletionSource <bool>, CancellationToken>);
f = (tcs, ct) => e.MoveNext(ct).Then(t =>
{
t.Handle(tcs, res =>
{
if (res)
{
tcs.TrySetResult(true);
}
else
{
if (switched)
{
tcs.TrySetResult(false);
}
else
{
switched = true;
e = second.GetEnumerator();
a.Disposable = e;
f(tcs, ct);
}
}
});
});
return Create(
(ct, tcs) =>
{
f(tcs, cts.Token);
return tcs.Task.UsingEnumerator(a);
},
() => e.Current,
d.Dispose
);
}));
}
public static IAsyncEnumerable <TSource> Using <TSource, TResource>(Func <TResource> resourceFactory, Func <TResource, IAsyncEnumerable <TSource> > enumerableFactory) where TResource : IDisposable
{
if (resourceFactory == null)
{
throw new ArgumentNullException(nameof(resourceFactory));
}
if (enumerableFactory == null)
{
throw new ArgumentNullException(nameof(enumerableFactory));
}
return(CreateEnumerable(
() =>
{
var resource = resourceFactory();
var e = default(IAsyncEnumerator <TSource>);
try
{
e = enumerableFactory(resource)
.GetEnumerator();
}
catch (Exception)
{
resource.Dispose();
throw;
}
var cts = new CancellationTokenDisposable();
var d = Disposable.Create(cts, resource, e);
var current = default(TSource);
return CreateEnumerator(
async ct =>
{
bool res;
try
{
res = await e.MoveNext(cts.Token)
.ConfigureAwait(false);
}
catch (Exception)
{
d.Dispose();
throw;
}
if (res)
{
current = e.Current;
return true;
}
d.Dispose();
return false;
},
() => current,
d.Dispose,
null
);
}));
}
public static IAsyncEnumerable <TSource> Using <TSource, TResource>(Func <TResource> resourceFactory, Func <TResource, IAsyncEnumerable <TSource> > enumerableFactory) where TResource : IDisposable
{
if (resourceFactory == null)
{
throw new ArgumentNullException("resourceFactory");
}
if (enumerableFactory == null)
{
throw new ArgumentNullException("enumerableFactory");
}
return(Create(() =>
{
var resource = resourceFactory();
var e = default(IAsyncEnumerator <TSource>);
try
{
e = enumerableFactory(resource).GetEnumerator();
}
catch (Exception)
{
resource.Dispose();
throw;
}
var cts = new CancellationTokenDisposable();
var d = Disposable.Create(cts, resource, e);
var current = default(TSource);
return Create(
(ct, tcs) =>
{
e.MoveNext(cts.Token).Then(t =>
{
t.Handle(tcs,
res =>
{
if (res)
{
current = e.Current;
tcs.TrySetResult(true);
}
else
{
d.Dispose();
tcs.TrySetResult(false);
}
},
ex =>
{
d.Dispose();
tcs.TrySetException(ex);
}
);
});
return tcs.Task;
},
() => current,
d.Dispose
);
}));
}
public static IAsyncEnumerable <TSource> TakeLast <TSource>(this IAsyncEnumerable <TSource> source, int count)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
return(CreateEnumerable(
() =>
{
var e = source.GetEnumerator();
var cts = new CancellationTokenDisposable();
var d = Disposable.Create(cts, e);
var q = new Queue <TSource>(count);
var done = false;
var current = default(TSource);
var f = default(Func <CancellationToken, Task <bool> >);
f = async ct =>
{
if (!done)
{
if (await e.MoveNext(ct)
.ConfigureAwait(false))
{
if (count > 0)
{
var item = e.Current;
if (q.Count >= count)
{
q.Dequeue();
}
q.Enqueue(item);
}
}
else
{
done = true;
e.Dispose();
}
return await f(ct)
.ConfigureAwait(false);
}
if (q.Count > 0)
{
current = q.Dequeue();
return true;
}
return false;
};
return CreateEnumerator(
f,
() => current,
d.Dispose,
e
);
}));
}