private void SendLastValue(Message msg)
{
var key = LabelWithoutPrefix(msg);
if (string.IsNullOrWhiteSpace(msg.ResponseQueue))
{
Console.Error.WriteLine($"INFO: Received a request for '{key}' without the response queue being set");
return;
}
var last = _cache[key];
if (last == null)
{
Console.Error.WriteLine($"DEBUG: there is no cached value for '{key}', sending an empty message");
last = new Message {
Label = key
};
}
var replyQueue = _queueCache.Open(msg.ResponseQueue, QueueAccessMode.Send);
last.CorrelationId = msg.Id;
replyQueue.Write(last);
Console.Error.WriteLine($"DEBUG: sent reply for '{key}' to {msg.ResponseQueue}");
// note: we do not wait for confirmation of delivery, we just report errors on via the AdminAsync (_adminTask)
}
/// <summary>Read messages from the input queue and forward to subscribers</summary>
async Task MulticastInputDispatcher()
{
await Task.Yield();
try
{
for (;;)
{
var msg = _inputReader.Read(Properties.All, TimeSpan.Zero) ?? await _inputReader.ReadAsync(Properties.All);
// we could avoid the lock by using an immutable collection
var subscribers = _subscriptions.GetSubscribers(msg.Label);
if (subscribers.Count == 0)
{
continue;
}
var fn = string.Join(",", subscribers.Select(s => s.FormatName).Distinct()); // create a multi-element format name
var q = _responseQueueCache.Open(fn, QueueAccessMode.Send);
msg.AdministrationQueue = _adminQueueFormatName;
q.Write(msg);
}
}
catch (QueueException ex) when(ex.ErrorCode == ErrorCode.OperationCanceled)
{
// stopped
}
catch (ObjectDisposedException)
{
// stopped
}
catch (Exception ex)
{
Console.Error.WriteLine("ERROR MulticastInputDispatcher: " + ex);
}
}