public static IObservable <T> Merge <T>(this IObservable <IObservable <T> > sources, int maxConcurrent)
{
// this code is borrwed from RxOfficial(rx.codeplex.com)
return(Observable.Create <T>(observer =>
{
var gate = new object();
var q = new Queue <IObservable <T> >();
var isStopped = false;
var group = new CompositeDisposable();
var activeCount = 0;
var subscribe = default(Action <IObservable <T> >);
subscribe = xs =>
{
var subscription = new SingleAssignmentDisposable();
group.Add(subscription);
subscription.Disposable = xs.Subscribe(
x =>
{
lock (gate)
observer.OnNext(x);
},
exception =>
{
lock (gate)
observer.OnError(exception);
},
() =>
{
group.Remove(subscription);
lock (gate)
{
if (q.Count > 0)
{
var s = q.Dequeue();
subscribe(s);
}
else
{
activeCount--;
if (isStopped && activeCount == 0)
{
observer.OnCompleted();
}
}
}
});
};
group.Add(sources.Subscribe(
innerSource =>
{
lock (gate)
{
if (activeCount < maxConcurrent)
{
activeCount++;
subscribe(innerSource);
}
else
{
q.Enqueue(innerSource);
}
}
},
exception =>
{
lock (gate)
observer.OnError(exception);
},
() =>
{
lock (gate)
{
isStopped = true;
if (activeCount == 0)
{
observer.OnCompleted();
}
}
}));
return group;
}));
}
public static IObservable <IList <T> > Buffer <T>(this IObservable <T> source, TimeSpan timeSpan, int count, IScheduler scheduler)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (count <= 0)
{
throw new ArgumentOutOfRangeException("count <= 0");
}
return(Observable.Create <IList <T> >(observer =>
{
var list = new List <T>();
var gate = new object();
var timerId = 0L;
var d = new CompositeDisposable(2);
var timerD = new SerialDisposable();
// timer
d.Add(timerD);
Action createTimer = () =>
{
var currentTimerId = timerId;
var timerS = new SingleAssignmentDisposable();
timerD.Disposable = timerS; // restart timer(dispose before)
timerS.Disposable = scheduler.Schedule(timeSpan, self =>
{
List <T> currentList;
lock (gate)
{
if (currentTimerId != timerId)
{
return;
}
currentList = list;
if (currentList.Count != 0)
{
list = new List <T>();
}
}
if (currentList.Count != 0)
{
observer.OnNext(currentList);
}
self(timeSpan);
});
};
createTimer();
// subscription
d.Add(source.Subscribe(x =>
{
List <T> currentList = null;
lock (gate)
{
list.Add(x);
if (list.Count == count)
{
currentList = list;
list = new List <T>();
timerId++;
createTimer();
}
}
if (currentList != null)
{
observer.OnNext(currentList);
}
}, observer.OnError, () =>
{
lock (gate)
{
timerId++;
}
var currentList = list;
observer.OnNext(currentList);
observer.OnCompleted();
}));
return d;
}));
}
public static IObservable <IList <TSource> > Buffer <TSource, TWindowBoundary>(this IObservable <TSource> source, IObservable <TWindowBoundary> windowBoundaries)
{
return(Observable.Create <IList <TSource> >(observer =>
{
var list = new List <TSource>();
var gate = new object();
var d = new CompositeDisposable(2);
d.Add(source.Subscribe(Observer.Create <TSource>(
x =>
{
lock (gate)
{
list.Add(x);
}
},
ex =>
{
lock (gate)
{
observer.OnError(ex);
}
},
() =>
{
lock (gate)
{
var currentList = list;
list = new List <TSource>(); // safe
observer.OnNext(currentList);
observer.OnCompleted();
}
}
)));
d.Add(windowBoundaries.Subscribe(Observer.Create <TWindowBoundary>(
w =>
{
List <TSource> currentList;
lock (gate)
{
currentList = list;
if (currentList.Count != 0)
{
list = new List <TSource>();
}
}
if (currentList.Count != 0)
{
observer.OnNext(currentList);
}
},
ex =>
{
lock (gate)
{
observer.OnError(ex);
}
},
() =>
{
lock (gate)
{
var currentList = list;
list = new List <TSource>(); // safe
observer.OnNext(currentList);
observer.OnCompleted();
}
}
)));
return d;
}));
}
public void Dispose()
{
disposables.Dispose();
disposables = null;
}