/// <summary>
/// Receives the <see cref="MmoObjectSnapshot"/> auto subscribes item if necessary.
/// </summary>
internal void ReceiveMmoObjectSnapshot(MmoObjectSnapshot message)
{
lock (SyncRoot)
{
// auto subscribe item?
if (CanAutoSubscribeMmoObject(message.Source) == false)
{
return;
}
MmoObjectAutoSubscription existingSubscription;
if (autoManagedItemSubscriptions.TryGetValue(message.Source, out existingSubscription))
{
// dropped out of world, unsubscribe
if (message.WorldRegion == null)
{
this.AutoUnsubscribeMmoObject(existingSubscription);
return;
}
// update position
existingSubscription.Position = message.Position;
existingSubscription.WorldRegion = message.WorldRegion;
return;
}
// item not in view
if (message.WorldRegion == null || this.subscribedWorldRegions.ContainsKey(message.WorldRegion) == false)
{
return;
}
// unsubscribe if item is disposed
var disposalSubscription = message.Source.DisposeChannel.Subscribe(this.subscriptionManagementFiber, this.AutoSubscribedMmoObject_OnMmoObjectDisposed);
// unsubscribe if item moves out of range
var positionSubscription = message.Source.PositionUpdateChannel.SubscribeToLast(this.subscriptionManagementFiber,
this.AutoSubscribedMmoObject_OnMmoObjectPosition,
GameObjectAutoUnsubcribeDelayMilliseconds);
var itemSubscription = new MmoObjectAutoSubscription(message.Source, message.Position, message.WorldRegion,
new UnsubscriberCollection(disposalSubscription, positionSubscription));
this.autoManagedItemSubscriptions.Add(message.Source, itemSubscription);
this.OnMmoObjectSubscribed(message);
}
}
/// <summary>
/// The auto unsubscribe item.
/// </summary>
private void AutoUnsubscribeMmoObject(MmoObjectAutoSubscription subscription)
{
subscription.Dispose();
this.autoManagedItemSubscriptions.Remove(subscription.MmoObject);
this.OnMmoObjectUnsubscribed(subscription.MmoObject);
}
