Question about WeakReferences
- by Impz0r
Hey there,
I've got a question regarding WeakReferences.
I'm right now in the process of writing a "Resource Manager" who hast to keep references to created texture objects. I have a Dictionary like:
Dictionary<uint, WeakReference>
Where the first is, as you allready may guessed, the Resource Id and the second param is a WeakReference to the Resource itself.
Right now my Resources do have a method to free themselfes from their Owner (i.e. Resource Manager). They do so in calling a method at the Resource Manger while passing a this reference to it. The ResMgr does lookup if it is a resource he keeps bookmark of and if so, does something like this:
WeakReference result;
if (m_Resources.TryGetValue(ResourceId, out result))
{
if (result.IsAlive)
return;
(result.Target as Resource).free(); // free for good
m_Resources.Remove(ResourceId);
}
The Problem I'm having is that the part after:
if (result.IsAlive)
is never reached because there are still leftover references to the Resource.
The thing is, I do only have one Reference of the Resource in question and it releases itself like:
resource.free(); // calls internally its owner (i.e. ResMgr)
resource = null;
I guess the left over reference would be the "resource" variable, but I cannot set it to null, because I do have to call free first. Quite a dilema...
Well what I wanted to achive with this is a Resource Manager who keeps references to its owning Resources and release them ONLY if there is no reference left to not screw up something.
Any idea how I may solve this in a clean fashion?
Thanks in advance!
Mfg Imp
