public static SerializedEvent ApplyConsumerFilter(SerializedEvent e, string consumer, ITextSerializer serializer, Func<string, ITextSerializer, string, bool> filter)
{
if (filter(consumer, serializer, e.Payload))
return e;
var originalEvent = serializer.Deserialize<IEvent>(e.Payload);
var cloaked = new CloakedEvent(originalEvent.EventCollectionVersion, originalEvent.StreamType);
return new SerializedEvent(e.EventCollectionVersion, serializer.Serialize(cloaked));
}
/// <remarks>
/// Timeout implementation inspired by: http://stackoverflow.com/questions/5018921/implement-c-sharp-timeout
/// </remarks>
public PollResponse PollEvents(long consumerVersion, string consumerName)
{
var ecv = this.store.CurrentEventCollectionVersion;
var newEvents = new SerializedEvent[0];
// last received version could be somehow less than 0. I found once that was -1,
// and was always pushing "0 events", as the signal r tracing showed (27/10/2015)
if (consumerVersion < 0)
consumerVersion = 0;
// the consumer says that is more updated than the source. That is an error. Maybe the publisher did not started yet!
if (ecv < consumerVersion)
return PollResponse.CreateSerializedResponse(true, false, this.streamType, newEvents, consumerVersion, ecv);
bool newEventsWereFound = false;
var errorDetected = false;
var stopwatch = Stopwatch.StartNew();
while (!this.stopping && stopwatch.Elapsed < this.longPollingTimeout)
{
if (ecv == consumerVersion)
{
// consumer is up to date, and now is waiting until something happens!
Thread.Sleep(1);
ecv = this.store.CurrentEventCollectionVersion; // I Forgot to update!
}
// weird error, but is crash proof. Once i had an error where in an infinite loop there was an error saying: Pushing 0 events to....
// A Charly le paso. Sucede que limpio la base de datos y justo queria entregar un evento y no devolvia nada.
else if (ecv > consumerVersion)
{
newEvents = this.store.FindEventsForConsumer(consumerVersion, ecv, this.eventsToPushMaxCount, consumerName);
if (newEvents.Length > 0)
{
newEventsWereFound = true;
this.log.Trace($"{this.streamType} publisher is pushing {newEvents.Length} event/s to {consumerName}");
break;
}
else
{
// Lo que le paso a charly.
newEventsWereFound = false;
errorDetected = true;
var errorMessage = $"There is an error in the event store or a racy condition. The consumer [{consumerName}] version is {consumerVersion} and the local event collection version should be {ecv} but it is not.";
this.log.Error(errorMessage);
this.bus.Publish(new FatalErrorOcurred(new FatalErrorException(errorMessage)));
break;
}
}
else
// bizzare, but helpful to avoid infinite loops
break;
}
return PollResponse.CreateSerializedResponse(errorDetected, newEventsWereFound, this.streamType, newEvents, consumerVersion, ecv);
}