When settings up a subscription, how can the position ever be null?

EventStoreDB
1

I’m implementing a subscription to eventstore where we subscribe to all events. It’s set up using something like this:

protected EventStoreSubscriber(IEventStoreConnection connection, Position? position)

{

_connection = connection;

_position = position != null ? position.Value : Position.Start;

_connection.Connected += SetUpSubscription;

}

private void SetUpSubscription(object sender, ClientConnectionEventArgs e)

{

_connection.SubscribeToAllFrom(_position, false, HandleEvent);

}

private void HandleEvent(EventStoreCatchUpSubscription arg1, ResolvedEvent arg2)

{

var eventAndMeta = EventSerialization.DeserializeEvent(arg2.OriginalEvent);

var eventType = eventAndMeta.Event.GetType();

if (_handlers.ContainsKey(eventType))

{

_handlers[eventType](eventAndMeta, arg2.OriginalPosition.Value);

}

_position = arg2.OriginalPosition.Value;

}

There’s one thing I’m a little bit confused about with this code, and that is the fact that OriginalPosition is nullable. When can it be null?

2

I believe it’s when resolveLinkTo is false.

3

it can be null if its a linkto say a deleted event

4

So that means when linkto is true? The right opposite of the other answer, or am I wrong?

5

linkto = true and not resolved.

i believe he was saying linkto but resolve=false