async Task RunAsync()
{
await Task.Yield();
Properties peekProps = Properties.Label | Properties.LookupId;
try
{
for (;;)
{
Message msg = _input.Peek(peekProps, TimeSpan.Zero) ?? await _input.PeekAsync(peekProps);
// at this point we only have the label and lookup id of the message
var subscribers = _subscriptions.Subscribers(msg.Label);
if (subscribers == null)
{
// no subscribers, remove message from input queue anyway
_input.Lookup(Properties.LookupId, msg.LookupId, LookupAction.ReceiveCurrent, TimeSpan.Zero);
continue;
}
// read the whole message now, remove it from the queue, and invoke the subscription callbacks
msg = _input.Lookup(Properties.All, msg.LookupId, LookupAction.ReceiveCurrent, TimeSpan.Zero);
if (msg == null)
{
Console.Error.WriteLine($"WARNING: we peeked message but it was removed before we could read it {{label={msg.Label}, lookupId={msg.LookupId}}}");
continue;
}
_subscriptions.TryInvokeAll(msg, subscribers);
}
}
catch (ObjectDisposedException)
{
// Stop was called
}
catch (QueueException ex) when(ex.ErrorCode == ErrorCode.OperationCanceled)
{
// Stop was called
}
catch (Exception ex)
{
Console.Error.WriteLine("WARNING: " + ex);
}
}