public static ChannelReader <T> AsChannelReader <T> (this IObservable <T> observable, int?maxBufferSize = null)
{
// This sample shows adapting an observable to a ChannelReader without
// back pressure, if the connection is slower than the producer, memory will
// start to increase.
// If the channel is bounded, TryWrite will return false and effectively
// drop items.
// The other alternative is to use a bounded channel, and when the limit is reached
// block on WaitToWriteAsync. This will block a thread pool thread and isn't recommended and isn't shown here.
var channel = maxBufferSize != null?Channel.CreateBounded <T> (maxBufferSize.Value) : Channel.CreateUnbounded <T> ();
var disposable = observable.Subscribe(
value => channel.Writer.TryWrite(value),
error => channel.Writer.TryComplete(error),
() => channel.Writer.TryComplete());
// Complete the subscription on the reader completing
channel.Reader.Completion.ContinueWith(task => disposable.Dispose());
return(channel.Reader);
}
