/// <summary>
/// Occurs when the item with the given key is used.
/// </summary>
/// <param name="key">Item key.</param>
private void OnItemUsed(TKey key)
{
int itemIndex = -1;
if (key != null)
{
lock (_lock)
{
itemIndex = Recency.IndexOf(key);
if (itemIndex != 0)
{
Recency.RemoveAt(itemIndex);
Recency.Insert(0, key);
}
}
}
}
/// <summary>
/// Adds or updates the item with the given key.
/// </summary>
/// <param name="key">Item key.</param>
/// <param name="value">Item value.</param>
private void SetInternal(TKey key, TValue value)
{
bool hadItem = false;
if (key != null)
{
hadItem = ContainsKey(key);
if (!hadItem)
{
// Did we reach capacity?
if (Count >= Capacity)
{
lock (_lock)
{
if (Count >= Capacity)
{
// Removing the oldest item
RemoveInternal(Recency[Recency.Count - 1]);
}
}
}
}
// Adding or updating the item
Data.AddOrUpdate(key, value, (k, v) => value);
if (!hadItem)
{
// Adding to recency
Recency.Insert(0, key);
}
else
{
// Marking item as most recently used
OnItemUsed(key);
}
}
}
