/// <summary>
/// Subscribes to the network database
/// </summary>
/// <param name="observer">The obsever to subscribe</param>
/// <returns>The disposable subscription instance</returns>
public IDisposable Subscribe(DescriptorQuery query, IDescriptorObserver <ObjectInfo, GlobalObjectId> observer)
{
DescriptorSubscription ret = null;
lock (_lock)
{
this._observers.Add(new DescriptorObserver(query, observer));
ret = new DescriptorSubscription(this, observer);
}
Task.Factory.StartNew(() =>
{
lock (_lock)
{
var descriptors = _db.QueryObjects(query);
observer.Add(descriptors);
}
});
return(ret);
}
/// <summary>
/// Disposes of a descriptor subscription, unsubscribing the observer
/// </summary>
/// <param name="observer">The observer to unsubscribe</param>
private void _disposeDescriptorSubscription(IDescriptorObserver <ObjectInfo, GlobalObjectId> observer)
{
lock (_lock)
{
bool removed = false;
for (int i = 0; i < _observers.Count; i++)
{
if (_observers[i].Observer == observer)
{
_observers.RemoveAt(i);
removed = true;
break;
}
}
if (removed)
{
observer.Close();
}
}
}
/// <summary>
/// Constructs a new descriptor subscription instance
/// </summary>
/// <param name="database">The network database</param>
/// <param name="observer">The observer</param>
public DescriptorSubscription(NetworkDatabase database, IDescriptorObserver <ObjectInfo, GlobalObjectId> observer)
{
this._database = database;
this._observer = observer;
}
public DescriptorObserver(DescriptorQuery query, IDescriptorObserver <ObjectInfo, GlobalObjectId> observer)
: this()
{
this.Query = query;
this.Observer = observer;
}
