private async Task BackgroundDispatchUsingSync(int amountToClear, int minimumAge)
{
if (await _backgroundClearSemaphoreToken.WaitAsync(TimeSpan.Zero))
{
await _clearSemaphoreToken.WaitAsync(CancellationToken.None);
try
{
var messages = OutBox.OutstandingMessages(minimumAge, amountToClear);
s_logger.LogInformation("Found {NumberOfMessages} to clear out of amount {AmountToClear}",
messages.Count(), amountToClear);
Dispatch(messages);
s_logger.LogInformation("Messages have been cleared");
}
catch (Exception e)
{
s_logger.LogError(e, "Error while dispatching from outbox");
}
finally
{
_clearSemaphoreToken.Release();
_backgroundClearSemaphoreToken.Release();
}
CheckOutstandingMessages();
}
else
{
s_logger.LogInformation("Skipping dispatch of messages as another thread is running");
}
}
private void OutstandingMessagesCheck()
{
if (Monitor.TryEnter(_checkOutStandingMessagesObject))
{
s_logger.LogDebug("Begin count of outstanding messages");
try
{
if (OutBox != null)
{
_outStandingCount = OutBox
.OutstandingMessages(ProducerRegistry.GetDefaultProducer()
.MaxOutStandingCheckIntervalMilliSeconds)
.Count();
return;
}
// else if(AsyncOutbox != null)
// {
// //TODO: There is no async version of this call at present; the thread here means that won't hurt if implemented
// _outStandingCount = AsyncOutbox
// .OutstandingMessages(ProducerRegistry.GetDefaultProducer().MaxOutStandingCheckIntervalMilliSeconds)
// .Count();
// return;
// }
_outStandingCount = 0;
}
catch (Exception ex)
{
//if we can't talk to the outbox, we would swallow the exception on this thread
//by setting the _outstandingCount to -1, we force an exception
s_logger.LogError(ex, "Error getting outstanding message count, reset count");
_outStandingCount = 0;
}
finally
{
s_logger.LogDebug("Current outstanding count is {OutStandingCount}", _outStandingCount);
Monitor.Exit(_checkOutStandingMessagesObject);
}
}
}