public void Handle(ProjectionMessage.Projections.SubscribeProjection message)
{
if (_stopped)
{
return;
}
var fromCheckpointTag = message.FromPosition;
var projectionSubscription = new ProjectionSubscription(
message.CorrelationId, fromCheckpointTag, message.Subscriber, message.Subscriber,
message.CheckpointStrategy, message.CheckpointUnhandledBytesThreshold);
_projections.Add(message.CorrelationId, projectionSubscription);
bool subscribedHeading = _headingEventDistributionPoint.TrySubscribe(
message.CorrelationId, projectionSubscription, fromCheckpointTag);
if (!subscribedHeading)
{
var distibutionPointCorrelationId = Guid.NewGuid();
var eventDistributionPoint = projectionSubscription.CreatePausedEventDistributionPoint(
_publisher, distibutionPointCorrelationId);
_distributionPoints.Add(distibutionPointCorrelationId, eventDistributionPoint);
_projectionDistributionPoints.Add(message.CorrelationId, distibutionPointCorrelationId);
_distributionPointSubscriptions.Add(distibutionPointCorrelationId, message.CorrelationId);
eventDistributionPoint.Resume();
}
}
private bool TrySubscribeHeadingDistributionPoint(
ProjectionCoreServiceMessage.CommittedEventDistributed message, Guid projectionId)
{
if (_pausedProjections.Contains(projectionId))
{
return(false);
}
var projectionSubscription = _subscriptions[projectionId];
if (message.SafeTransactionFileReaderJoinPosition == null ||
!_headingEventDistributionPoint.TrySubscribe(
projectionId, projectionSubscription, message.SafeTransactionFileReaderJoinPosition.Value))
{
return(false);
}
if (message.Data == null)
{
_logger.Trace(
"The '{0}' is subscribing to the heading distribution point with TF-EOF marker event at '{1}'",
projectionId, message.SafeTransactionFileReaderJoinPosition);
}
Guid distributionPointId = message.CorrelationId;
_distributionPoints[distributionPointId].Dispose();
_distributionPoints.Remove(distributionPointId);
_distributionPointSubscriptions.Remove(distributionPointId);
_projectionDistributionPoints[projectionId] = Guid.Empty;
return(true);
}
public void setup()
{
_exception = null;
try
{
_point = new HeadingEventDistributionPoint(10);
}
catch (Exception ex)
{
_exception = ex;
}
_distibutionPointCorrelationId = Guid.NewGuid();
_point.Start(
_distibutionPointCorrelationId,
new TransactionFileReaderEventDistributionPoint(
_bus, _distibutionPointCorrelationId, new EventPosition(0, -1)));
_point.Handle(
new ProjectionMessage.Projections.CommittedEventDistributed(
_distibutionPointCorrelationId, new EventPosition(20, 10), "stream", 10, false,
new Event(Guid.NewGuid(), "type", false, new byte[0], new byte[0])));
_point.Handle(
new ProjectionMessage.Projections.CommittedEventDistributed(
_distibutionPointCorrelationId, new EventPosition(40, 30), "stream", 11, false,
new Event(Guid.NewGuid(), "type", false, new byte[0], new byte[0])));
_subscription = new FakeProjectionSubscription();
_projectionSubscriptionId = Guid.NewGuid();
var subscribed = _point.TrySubscribe(
_projectionSubscriptionId, _subscription,
CheckpointTag.FromStreamPosition("stream", 100, prepaprePosition: 30));
_point.Handle(
new ProjectionMessage.Projections.CommittedEventDistributed(
_distibutionPointCorrelationId, new EventPosition(60, 50), "stream", 12, false,
new Event(Guid.NewGuid(), "type", false, new byte[0], new byte[0])));
}
public void setup()
{
_exception = null;
try
{
_point = new HeadingEventDistributionPoint(10);
}
catch (Exception ex)
{
_exception = ex;
}
_distibutionPointCorrelationId = Guid.NewGuid();
_point.Start(
_distibutionPointCorrelationId,
new TransactionFileReaderEventDistributionPoint(
_bus, _distibutionPointCorrelationId, new EventPosition(0, -1)));
_point.Handle(
new ProjectionCoreServiceMessage.CommittedEventDistributed(
_distibutionPointCorrelationId, new EventPosition(20, 10), "stream", 10, false,
new Event(Guid.NewGuid(), "type", false, new byte[0], new byte[0])));
_point.Handle(
new ProjectionCoreServiceMessage.CommittedEventDistributed(
_distibutionPointCorrelationId, new EventPosition(40, 30), "stream", 11, false,
new Event(Guid.NewGuid(), "type", false, new byte[0], new byte[0])));
_subscription = new FakeProjectionSubscription();
_projectionSubscriptionId = Guid.NewGuid();
var subscribed = _point.TrySubscribe(_projectionSubscriptionId, _subscription, 30);
Assert.IsTrue(subscribed); // ensure we really unsubscribing.. even if it is tested elsewhere
_point.Unsubscribe(_projectionSubscriptionId);
}
