public void Handle(ReaderSubscriptionManagement.Pause message)
{
if (!_pausedSubscriptions.Add(message.SubscriptionId))
{
throw new InvalidOperationException("Already paused projection");
}
IReaderSubscription projectionSubscription;
if (!_subscriptions.TryGetValue(message.SubscriptionId, out projectionSubscription))
{
return; // may be already unsubscribed when self-unsubscribing
}
var eventReaderId = _subscriptionEventReaders[message.SubscriptionId];
if (eventReaderId == Guid.Empty) // head
{
_subscriptionEventReaders.Remove(message.SubscriptionId);
_headingEventReader.Unsubscribe(message.SubscriptionId);
var forkedEventReaderId = Guid.NewGuid();
var forkedEventReader = projectionSubscription.CreatePausedEventReader(
_publisher, _ioDispatcher, forkedEventReaderId);
_subscriptionEventReaders.Add(message.SubscriptionId, forkedEventReaderId);
_eventReaderSubscriptions.Add(forkedEventReaderId, message.SubscriptionId);
_eventReaders.Add(forkedEventReaderId, forkedEventReader);
_publisher.Publish(
new EventReaderSubscriptionMessage.ReaderAssignedReader(
message.SubscriptionId, forkedEventReaderId));
}
else
{
_eventReaders[eventReaderId].Pause();
}
}
public void Handle(ReaderSubscriptionManagement.Pause message)
{
if (!_pausedSubscriptions.Add(message.SubscriptionId))
{
throw new InvalidOperationException("Already paused projection");
}
var projectionSubscription = _subscriptions[message.SubscriptionId];
var eventReaderId = _subscriptionEventReaders[message.SubscriptionId];
if (eventReaderId == Guid.Empty) // head
{
_subscriptionEventReaders.Remove(message.SubscriptionId);
_headingEventReader.Unsubscribe(message.SubscriptionId);
var forkedEventReaderId = Guid.NewGuid();
var forkedEventReader = projectionSubscription.CreatePausedEventReader(_publisher, forkedEventReaderId);
_subscriptionEventReaders.Add(message.SubscriptionId, forkedEventReaderId);
_eventReaderSubscriptions.Add(forkedEventReaderId, message.SubscriptionId);
_eventReaders.Add(forkedEventReaderId, forkedEventReader);
_publisher.Publish(
new ReaderSubscriptionManagement.ReaderAssignedReader(message.SubscriptionId, forkedEventReaderId));
}
else
{
_eventReaders[eventReaderId].Pause();
}
}
