public IReference <TValue> GetOrCreate(TKey key, Func <TKey, TValue> factory)
{
lock (_lock)
{
if (_sources.TryGetValue(key, out var source) == false)
{
source = new ReferenceSource <TValue>(factory(key), s =>
{
lock (_lock)
{
_sources.Remove(key);
}
});
_sources.Add(key, source);
}
if (!source.TryCreateReference(out var reference))
{
//source is disposed so we can remove it
_sources.Remove(key);
return(GetOrCreate(key, factory));
}
return(reference);
}
}
public Reference(ReferenceSource <T> source)
{
_source = source;
Interlocked.Increment(ref _source._refCounter);
}