public T GetDistinctInstance(T newInstance, out bool instanceAlreadyExists)
{
lock (monitor)
{
if (newInstance == null)
{
throw new ArgumentNullException("newInstance");
}
HashableWeakReference weakRef = new HashableWeakReference(newInstance);
if (this.distinctInstances.ContainsKey(weakRef))
{
HashableWeakReference existing = this.distinctInstances[weakRef];
if (existing.IsAlive)
{
IDisposable disposable = newInstance as IDisposable;
if (disposable != null)
{
disposable.Dispose();
}
instanceAlreadyExists = true;
return((T)existing.Target);
}
else
{
this.distinctInstances.Remove(existing);
}
}
#if !NO_AUTO_CLEAN_UP_OF_DISTINCT_INSTANCES
if (this.AutoCleanup && this.autoCleanUpTimer == null)
{
this.autoCleanUpTimer = new Timer(new TimerCallback((state) => this.CleanUpUnusedReferences()), null, 0, AUTO_CLEANUP_INTERVAL);
}
#endif
this.distinctInstances.Add(weakRef, weakRef);
instanceAlreadyExists = false;
return(newInstance);
}
}
public override bool Equals(object obj)
{
lock (this.monitor)
{
HashableWeakReference other = obj as HashableWeakReference;
if (this.IsAlive)
{
if (other != null)
{
return(other.IsAlive && object.Equals(this.Target, other.Target));
}
else
{
return(object.Equals(this.Target, obj));
}
}
else
{
return(false);
}
}
}
