public void LogsUnhandledAsyncExceptionsToPreventThemFromCrashingApplication()
{
var exception = new Exception(Guid.NewGuid().ToString());
var buffer = new StubTransmissionBuffer
{
OnEnqueue = getTransmissionAsync =>
{
throw exception;
}
};
Transmitter transmitter = CreateTransmitter(buffer: buffer);
using (var listener = new TestEventListener())
{
const long AllKeywords = -1;
listener.EnableEvents(TelemetryChannelEventSource.Log, EventLevel.Warning, (EventKeywords)AllKeywords);
buffer.OnTransmissionDequeued(new TransmissionProcessedEventArgs(new StubTransmission()));
EventWrittenEventArgs message = listener.Messages.First();
Assert.Contains(exception.Message, (string)message.Payload[0], StringComparison.Ordinal);
}
}
public void MovesOldestTransmissionFromStorageToBuffer()
{
var previouslyStoredTransmissions = new List<Transmission> { new StubTransmission(), new StubTransmission() };
int storageIndex = 0;
var storage = new StubTransmissionStorage
{
OnDequeue = () =>
{
if (storageIndex < previouslyStoredTransmissions.Count)
{
return previouslyStoredTransmissions[storageIndex++];
}
return null;
}
};
var newlyBufferedTransmissions = new List<Transmission>();
var buffer = new StubTransmissionBuffer
{
OnEnqueue = getTransmission =>
{
var transmission = getTransmission();
if (transmission != null)
{
newlyBufferedTransmissions.Add(transmission);
return true;
}
return false;
}
};
var sender = new StubTransmissionSender();
Transmitter queue = CreateTransmitter(sender: sender, buffer: buffer, storage: storage);
buffer.OnTransmissionDequeued(new TransmissionProcessedEventArgs(null));
Assert.Equal(previouslyStoredTransmissions, newlyBufferedTransmissions);
}