public static IAsyncObservable <TSource> StartAsync <TSource>(Func <CancellationToken, Task <TSource> > functionAsync, IAsyncScheduler scheduler)
{
if (functionAsync == null)
{
throw new ArgumentNullException(nameof(functionAsync));
}
if (scheduler == null)
{
throw new ArgumentNullException(nameof(scheduler));
}
var cancel = new CancellationAsyncDisposable();
var task = default(Task <TSource>);
try
{
task = functionAsync(cancel.Token);
}
catch (Exception ex)
{
return(Throw <TSource>(ex));
}
return(Create <TSource>(async observer =>
{
var subscription = await task.ToAsyncObservable(scheduler).SubscribeAsync(observer).ConfigureAwait(false);
return StableCompositeAsyncDisposable.Create(cancel, subscription);
}));
}
protected virtual async ValueTask <IAsyncDisposable> ScheduleAsyncCore(Func <CancellationToken, ValueTask> action)
{
var cad = new CancellationAsyncDisposable();
await ScheduleAsyncCore(action, cad.Token).ConfigureAwait(false);
return(cad);
}
