/// <summary>
/// Decrements the refcount for the given item. Releases the item if its refcount reaches zero.
/// </summary>
/// <remarks>This method is thread-safe.</remarks>
/// <param name="item">The item to release.</param>
public void Release([CanBeNull] TItem item)
{
if (ReferenceEquals(item, null))
{
return;
}
ItemRefCount itemRef;
if (_refs.TryGetValue(item, out itemRef))
{
lock (itemRef) {
if (itemRef.Count > 0)
{
itemRef.Dec();
Decremented.Call(item);
ItemRefCount removedRef;
if (itemRef.IsZero() && _refs.TryRemove(item, out removedRef))
{
Released.Call(item);
}
}
}
}
}
/// <summary> Sets refcount to zero for all retained items and releases them. </summary>
/// <remarks>This method is thread-safe.</remarks>
public void Clear()
{
foreach (var refKvp in _refs)
{
ItemRefCount itemRef;
if (_refs.TryRemove(refKvp.Key, out itemRef))
{
itemRef.SetToZero();
Decremented.Call(refKvp.Key);
Released.Call(refKvp.Key);
}
}
}