/// <summary>
/// Creates the Subscription with EventStore.
/// </summary>
/// <param name="streamName">The name of the EventStore Stream we are subscribing to.</param>
/// <param name="eventStoreStreamSequenceToken"></param>
/// <returns>An EventStoreSubscription or EventStorePersistentSubscription.</returns>
private object CreateEventStoreSubscription(string streamName, EventStoreStreamSequenceToken eventStoreStreamSequenceToken)
{
object subscription = null;
if (eventStoreStreamSequenceToken == null || eventStoreStreamSequenceToken.EventNumber == int.MinValue)
{
var subscribeTask = m_EventStoreConnection.SubscribeToStreamAsync(streamName, true, EventAppeared,
SubscriptionDropped);
Task.WaitAll(subscribeTask);
if (subscribeTask.IsFaulted)
{
throw subscribeTask.Exception;
}
subscription = subscribeTask.Result;
}
else
{
// If we have been provided with a StreamSequenceToken, we can call SubscribeFrom to get previous messages.
subscription = m_EventStoreConnection.SubscribeToStreamFrom(streamName,
eventStoreStreamSequenceToken.EventNumber, new CatchUpSubscriptionSettings(100, 20, false, true), EventAppeared);
}
m_Logger.Info($"Subscribed to Stream {streamName}");
return(subscription);
}
/// <summary>
/// Notify the AdapterRecevier that it should subscribe to an EventStore Stream.
/// </summary>
/// <param name="streamNamespace"></param>
/// <param name="eventStoreStreamSequenceToken"></param>
public void SubscribeTo(string streamNamespace, EventStoreStreamSequenceToken eventStoreStreamSequenceToken)
{
m_CachedSubscriptions.AddOrUpdate(streamNamespace, name => CreateEventStoreSubscription(name, eventStoreStreamSequenceToken),
(streamName, stream) => stream); // Update is a NO-OP.
}
private void EnqueueEvent(string streamId, ResolvedEvent resolvedEvent)
{
var sequenceToken = new EventStoreStreamSequenceToken(resolvedEvent.Event.EventNumber);
m_MessagesAwaitingDelivery.Enqueue(new EventStoreBatchContainer(Guid.Empty, streamId, sequenceToken, resolvedEvent));
}