/// <summary>
/// Promote a GC object for LRU
/// </summary>
/// <param name="handle">list handle returned by add</param>
/// <param name="value">value to replace</param>
/// <returns>this</returns>
public LruList <T> Promote(LruHandle handle, T value)
{
long counter = Interlocked.Increment(ref _counter);
_masterList.Update(handle.Index, x => new ItemDetail(value, counter));
_gen1.Enqueue(new ItemReference(handle, counter));
return(this);
}
/// <summary>
/// Add value to GC list
/// </summary>
/// <param name="value">value (must be not null)</param>
/// <returns>GC handle</returns>
public LruHandle Add(T value)
{
long counter = Interlocked.Increment(ref _counter);
Prune();
int index = _masterList.Add(new ItemDetail(value, counter));
var lruHandle = new LruHandle(index);
_gen1.Enqueue(new ItemReference(lruHandle, counter));
return(lruHandle);
}
/// <summary>
/// Set cache item. If value already exist, remove it and add the new one
/// </summary>
/// <param name="key">key</param>
/// <param name="value">value</param>
/// <returns>this</returns>
public LruDictionary <TKey, TValue> Set(TKey key, TValue value)
{
lock (_lock)
{
ValueItem valueItem;
if (_dict.TryGetValue(key, out valueItem))
{
_lruList.Promote(valueItem.Handle, new KeyValuePair <TKey, TValue>(key, value));
return(this);
}
LruHandle handle = _lruList.Add(new KeyValuePair <TKey, TValue>(key, value));
_dict[key] = new ValueItem(value, handle);
//_dict[key] = new ValueItem(value, new LruHandle(0));
return(this);
}
}
/// <summary>
/// Get or create new item
/// </summary>
/// <param name="key">key</param>
/// <param name="create">function to create</param>
/// <returns>retrieved or created value</returns>
public TValue GetOrCreate(TKey key, Func <TValue> create)
{
lock (_lock)
{
ValueItem valueItem;
if (_dict.TryGetValue(key, out valueItem))
{
_lruList.Promote(valueItem.Handle);
return(valueItem.Value);
}
TValue value = create();
LruHandle handle = _lruList.Add(new KeyValuePair <TKey, TValue>(key, value));
_dict[key] = new ValueItem(value, handle);
//_dict[key] = new ValueItem(value, new LruHandle(0));
return(value);
}
}
public ItemReference(LruHandle handle, long counter)
{
Handle = handle;
Counter = counter;
}
/// <summary>
/// Remove item
/// </summary>
/// <param name="handle">handle of LRU</param>
/// <returns>this</returns>
public LruList <T> Remove(LruHandle handle)
{
_masterList.Remove(handle.Index);
return(this);
}
public ValueItem(TValue value, LruHandle handle)
{
Value = value;
Handle = handle;
}