public RefData Add(TKey key, TValue value, int weight, bool commit = true)
{
this.CheckWeight(weight, null);
if (0 > weight)
{
weight = 0;
}
var refData = new RefData(key, value, weight);
if (commit)
{
refData.AddRef();
refData.ResetGeneration();
this.foreground.Add(key, refData);
}
else
{
refData.SetBackgroundNode(this.background.AddFirst(refData));
}
this.weight += weight;
return(refData);
}
public bool Remove(TKey key)
{
RefData refData = null;
switch (this.TryGetValue(key, out refData))
{
default:
case Flag.Null:
return(false);
case Flag.Committed:
refData.Discard();
this.foreground.Remove(key);
break;
case Flag.Uncommitted:
this.background.Remove(refData.BackgroundNode);
refData.SetBackgroundNode(null);
break;
}
this.DecreaseWeight(refData);
return(true);
}
protected Flag TryGetValue(TKey key, out RefData refData)
{
if (this.foreground.TryGetValue(key, out refData))
{
return(Flag.Committed);
}
LinkedListNode <RefData> node = this.background.First;
while (null != node)
{
refData = node.Value;
if (refData.Key.Equals(key))
{
refData.SetBackgroundNode(node);
return(Flag.Uncommitted);
}
node = node.Next;
}
refData = null;
return(Flag.Null);
}