private ValueTask <HttpConnection> GetOrReserveHttpConnectionAsync(CancellationToken cancellationToken)
{
CachedConnection cachedConnection = null;
TaskCompletionSourceWithCancellation <HttpConnection> waiter = default(TaskCompletionSourceWithCancellation <HttpConnection>);
lock (SyncObj)
{
var list = _idleConnections;
if (list.Count > 0)
{
cachedConnection = list[list.Count - 1];
list.RemoveAt(list.Count - 1);
}
else
{
if (_associatedConnectionCount < _maxConnections)
{
IncrementConnectionCountNoLock();
return(new ValueTask <HttpConnection>((HttpConnection)null));
}
else
{
waiter = EnqueueWaiter(cancellationToken);
}
}
}
if (cachedConnection != null)
{
return(new ValueTask <HttpConnection>(cachedConnection._connection));
}
else
{
//wait for connection return to pool
return(new ValueTask <HttpConnection>(waiter.WaitWithCancellationAsync(cancellationToken)));
}
}
public bool Equals(CachedConnection other) => ReferenceEquals(other._connection, _connection);
