public Task <TValue> Get(TKey key, MissingValueFactory <TKey, TValue> missingValueFactory)
{
lock (_lock)
{
INode <TValue> existingNode;
if (TryGetExistingNode(key, out existingNode))
{
if (existingNode.HasValue)
{
_nodeTracker.Statistics.Hit();
return(existingNode.Value);
}
var pending = new PendingValue <TKey, TValue>(key, missingValueFactory);
return(existingNode.GetValue(pending));
}
if (missingValueFactory == null)
{
_nodeTracker.Statistics.Miss();
throw new KeyNotFoundException($"Key not found: {key}");
}
var pendingValue = new PendingValue <TKey, TValue>(key, missingValueFactory);
var nodeValueFactory = new NodeValueFactory <TValue>(pendingValue, 0);
var node = new FactoryNode <TValue>(nodeValueFactory);
_index[key] = new WeakReference <INode <TValue> >(node, false);
_nodeTracker.Add(nodeValueFactory);
return(pendingValue.Value);
}
}
public void Add(TValue value)
{
_nodeTracker.Add(value);
}
