public static async IAsyncEnumerable <TItem> AsAsyncEnumerable <TItem>(
this IAlpacaDataSubscription <TItem> subscription,
[EnumeratorCancellation] CancellationToken cancellationToken)
{
subscription.EnsureNotNull(nameof(subscription));
var buffer = Channel.CreateUnbounded <TItem>();
subscription.Received += HandleReceived;
try
{
while (await buffer.Reader
.WaitToReadAsync(cancellationToken)
.ConfigureAwait(false))
{
yield return(await buffer.Reader
.ReadAsync(cancellationToken)
.ConfigureAwait(false));
}
}
finally
{
subscription.Received -= HandleReceived;
buffer.Writer.TryComplete();
}
void HandleReceived(TItem item) => buffer.Writer.TryWrite(item);
}
private DisposableAlpacaDataSubscription(
IAlpacaDataSubscription <TItem> subscription,
IStreamingDataClient client)
{
_subscription = subscription;
_client = client;
}
public static async ValueTask <IDisposableAlpacaDataSubscription <TItem> > CreateAsync(
IAlpacaDataSubscription <TItem> subscription,
IStreamingDataClient client)
{
await client.SubscribeAsync(subscription).ConfigureAwait(false);
return(new DisposableAlpacaDataSubscription <TItem>(subscription, client));
}
public DisposableAlpacaDataSubscription(
IAlpacaDataSubscription <TItem> subscription,
IAlpacaDataStreamingClient client)
{
_subscription = subscription;
_client = client;
_client.Subscribe(_subscription);
}
public static IAsyncEnumerable <TItem> AsAsyncEnumerable <TItem>(
this IAlpacaDataSubscription <TItem> subscription) =>
AsAsyncEnumerable(subscription, CancellationToken.None);
