public ValueTask EnqueueAsync(
KuduOperation operation,
CancellationToken cancellationToken = default)
{
return(_writer.WriteAsync(operation, cancellationToken));
}
private async Task <bool> DequeueAsync(List <KuduOperation> batch)
{
ChannelReader <KuduOperation> reader = _reader;
CancellationToken flushToken = _flushCts.Token;
bool flushRequested = flushToken.IsCancellationRequested;
int capacity = _options.BatchSize;
// Drain the queue before asynchronously waiting until the batch
// is full or the flush interval is met.
while (reader.TryRead(out var operation))
{
batch.Add(operation);
if (batch.Count >= capacity)
{
// The batch is full, but we can't complete a pending flush
// here as there could still be more items in the queue.
return(false);
}
}
if (flushRequested)
{
// Short-circuit if a flush was requested and the queue is empty.
return(true);
}
try
{
if (batch.Count == 0)
{
// Wait indefinitely for the first operation.
KuduOperation operation = await reader.ReadAsync(flushToken)
.ConfigureAwait(false);
batch.Add(operation);
}
using var timeout = new CancellationTokenSource(_options.FlushInterval);
using var linkedCts = CancellationTokenSource.CreateLinkedTokenSource(
timeout.Token, flushToken);
var token = linkedCts.Token;
while (batch.Count < capacity)
{
KuduOperation operation = await reader.ReadAsync(token)
.ConfigureAwait(false);
batch.Add(operation);
}
}
catch (OperationCanceledException)
{
// We've hit the flush interval, or someone called FlushAsync().
while (batch.Count < capacity &&
reader.TryRead(out var operation))
{
batch.Add(operation);
}
}
catch (ChannelClosedException)
{
// This session was disposed.
// The queue is empty and is not accepting new items.
}
return(flushRequested && batch.Count < capacity);
}