/// <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.eventCollectionVersion;
var newEvents = new List <NewRawEvent>();
// 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 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.eventCollectionVersion; // 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.dao.FindEvents(consumerVersion, eventsToPushMaxCount);
if (newEvents.Count > 0)
{
newEventsWereFound = true;
this.log.Trace($"{this.SourceName} publisher is pushing {newEvents.Count} event/s to {consumerName}");
break;
}
else
{
// Lo que le paso a charly.
newEventsWereFound = false;
//this.log.Error($"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 {this.eventCollectionVersion} but it is not.");
this.bus.Publish(new FatalErrorOcurred(new FatalErrorException($"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 {this.eventCollectionVersion} but it is not.")));
break;
}
}
else
{
// bizzare, but helpful to avoid infinite loops
break;
}
}
return(PollResponse.CreateSerializedResponse(false, newEventsWereFound, this.streamType, newEvents, consumerVersion, ecv));
}
public PollResponse PollEvents(long eventBufferVersion, string consumerName)
{
this.consumerEventCollectionVersion = eventBufferVersion < 0 ? 0 : eventBufferVersion;
PollResponse clientResponse;
while (!this.producerResponse.TryTake(out clientResponse))
{
Thread.Sleep(1);
}
if (!clientResponse.ErrorDetected &&
clientResponse.NewEventsWereFound &&
clientResponse.ConsumerVersion == this.consumerEventCollectionVersion && // only updates if versions are equall. Nasty errors ocurred while trying to synchronize.
clientResponse.ProducerVersion > eventBufferVersion &&
clientResponse.NewRawEvents.Max(x => x.EventCollectionVersion) > eventBufferVersion)
{
clientResponse = PollResponse.CreateSerializedResponse(false, true, clientResponse.StreamType,
clientResponse.NewRawEvents.Where(x => x.EventCollectionVersion > eventBufferVersion).ToList(), eventBufferVersion, clientResponse.ProducerVersion);
}
else
{
clientResponse = PollResponse.CreateSerializedResponse(false, false, clientResponse.StreamType, new List <SerializedEvent>(), 0, 0);
}
return(clientResponse);
}
public PollResponse PollEvents(long eventBufferVersion, string consumerName)
{
this.serverStatus.Add(new ServerStatus(eventBufferVersion));
PollResponse clientResponse;
while (!this.clientResponse.TryTake(out clientResponse))
{
Thread.Sleep(1);
}
lock (this)
{
if (clientResponse.ProducerVersion > eventBufferVersion &&
clientResponse.NewRawEvents.Max(x => x.EventCollectionVersion) > eventBufferVersion)
{
clientResponse = PollResponse.CreateSerializedResponse(false, true, clientResponse.StreamType,
clientResponse.NewRawEvents.Where(x => x.EventCollectionVersion > eventBufferVersion).ToList(), eventBufferVersion, clientResponse.ProducerVersion);
}
else
{
clientResponse = PollResponse.CreateSerializedResponse(false, false, clientResponse.StreamType, new List <NewRawEvent>(), 0, 0);
}
return(clientResponse);
}
}
public PollResponse PollEvents(Guid streamId, 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, streamId, this.eventsToPushMaxCount, consumerName);
newEventsWereFound = true;
this.log.Trace($"{this.streamType} publisher is pushing {newEvents.Length} event/s to {consumerName}");
break;
}
else
{
// bizzare, but helpful to avoid infinite loops
break;
}
}
return(PollResponse.CreateSerializedResponse(errorDetected, newEventsWereFound, this.streamType, newEvents, consumerVersion, ecv));
}