public LFUNode RemoveLFUNode()
{
LFUNode target = Tail.Previous;
RemoveNode(target);
return(target);
}
private void release(LFUNode <K, V> lastNode)
{
LFUNode <K, V>[] array = new LFUNode <K, V> [this.linked.Count];
this.linked.Values.CopyTo(array, 0);
Array.Sort <LFUNode <K, V> >(array);
for (int i = array.Length - 1; i >= 0; i--)
{
if (array[i] != lastNode)
{
if (this.mDestroy == null)
{
this.linked.Remove(array[i].Key);
if (this.DestroyAction != null)
{
this.DestroyAction(array[i]);
}
break;
}
bool flag = this.mDestroy.CanDestroy(array[i]);
if (flag)
{
this.linked.Remove(array[i].Key);
this.mDestroy.DestroyNode(array[i]);
break;
}
}
}
}
public void AddToTop(LFUNode node)
{
node.Previous = Head;
node.Next = Head.Next;
node.Next.Previous = node;
Head.Next = node;
Count++;
}
public void RemoveNode(LFUNode node)
{
node.Previous.Next = node.Next;
node.Next.Previous = node.Previous;
node.Previous = null;
node.Next = null;
Count--;
}
public LFUDoubleLinkedList()
{
Head = new LFUNode();
Tail = new LFUNode();
Head.Next = Tail;
Tail.Previous = Head;
Count = 0;
}
private void addGhostLFUCache(Node <K, V> node)
{
LFUNode <K, V> lFUNode = node as LFUNode <K, V>;
this.fuGhostCache.Put(node.Key, node.Value, lFUNode.RefCount);
if (this.DestroyCallback != null)
{
this.DestroyCallback(node);
}
}
// get the value and then promote the node
public int Get(int key)
{
if (!map.ContainsKey(key))
{
return(-1);
}
LFUNode node = map[key];
PromoteNode(node);
return(node.Value);
}
/// <summary>
/// 添加元素
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
public void Put(K key, V value)
{
//先从LRU缓存中进行命中测试
Node <K, V> node = ruCache.GetNode(key);
if (node != null)
{
//lru缓存链中被命中，则添加到LFU中
ruCache.RemoveKey(key);
fuCache.Put(key, value);
return;
}
//从LFU中进行命中测试
node = fuCache.GetNode(key);
if (node != null)
{
return;
}
//检测幽灵命中，已经被释放的资源重新添加
int maxCapactity = initCapactity + initCapactity / 2;
node = ruGhostCache.GetNode(key);
if (node != null)
{
if (ruCache.Full && ruCache.Capactity < maxCapactity)
{
ruCache.Capactity++;
fuCache.CapacityMax--;
}
ruCache.Put(key, value);
ruGhostCache.RemoveKey(key);
return;
}
node = fuGhostCache.GetNode(key);
if (node != null)
{
if (fuCache.Full && fuCache.CapacityMax < maxCapactity)
{
fuCache.CapacityMax++;
ruCache.Capactity--;
}
LFUNode <K, V> fuNode = node as LFUNode <K, V>;
fuCache.Put(key, value, fuNode.RefCount);
fuGhostCache.RemoveKey(key);
return;
}
//新资源处理
ruCache.Put(key, value);
}
/// <summary>
/// 添加到镜像LFU缓存
/// </summary>
/// <param name="node"></param>
private void addGhostLFUCache(Node <K, V> node)
{
LFUNode <K, V> fuNode = node as LFUNode <K, V>;
fuGhostCache.Put(node.Key, node.Value, fuNode.RefCount);
//只会销毁缓存数据，而会保留缓存引用记录
if (DestroyCallback != null)
{
DestroyCallback.Invoke(node);
}
}
/// <summary>
/// 添加元素
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <returns></returns>
public void Add(TKey key, TValue value)
{
var lockSeed = false;
if (!this.spinLock.IsHeldByCurrentThread)
{
this.spinLock.Enter(ref lockSeed);
}
LFUNode currentEntity = null;
if (_dictionary.ContainsKey(key))
{
Log?.Invoke(this, $"覆盖已有的键：{key}={value}");
currentEntity = _dictionary[key];
currentEntity.Value = value;
RemoveFromSet(currentEntity);
currentEntity.Frequency++;
AddToSet(currentEntity);
}
else
{
Log?.Invoke(this, $"新增缓存：{key}={value}");
if (_dictionary.Count == capacity)
{
Log?.Invoke(this, $"缓存过多，需要删除最不常用缓存...");
var removeEntity = GetLeastFrequentEntity();
if (removeEntity != null)
{
Remove(removeEntity.Key);
}
}
if (_dictionary.Count < capacity)
{
currentEntity = new LFUNode();
currentEntity.Key = key;
currentEntity.Value = value;
this._dictionary.Add(key, currentEntity);
AddToSet(currentEntity);
}
}
if (lockSeed)
{
this.spinLock.Exit();
}
}
public int CompareTo(object other)
{
LFUNode <K, V> yNode = other as LFUNode <K, V>;
if (RefCount == yNode.RefCount)
{
TimeSpan span = UserTime.Subtract(yNode.UserTime);
if (span.Milliseconds == 0)
{
return(0);
}
return(span.Milliseconds > 0 ? -1 : 1);
}
return(-RefCount.CompareTo(yNode.RefCount));
}
public override string ToString()
{
LFUNode <K, V>[] nodeArr = new LFUNode <K, V> [linked.Count];
linked.Values.CopyTo(nodeArr, 0);
Array.Sort(nodeArr);
StringBuilder sb = new StringBuilder();
foreach (LFUNode <K, V> lfuNode in nodeArr)
{
sb.AppendFormat("refCount:{1} , dataTime : {2} key :{0} / {3}\r\n",
lfuNode.Key, lfuNode.RefCount, lfuNode.UserTime.Millisecond, lfuNode.Value);
}
return(sb.ToString());
}
private void releaseMax(List <LFUNode <K, V> > nodeArr)
{
if (this.Size <= this.capacityMax)
{
return;
}
LFUNode <K, V> lFUNode = nodeArr[nodeArr.Count - 1];
this.linked.Remove(lFUNode.Key);
nodeArr.RemoveAt(nodeArr.Count - 1);
if (this.DestroyAction != null)
{
this.DestroyAction(lFUNode);
}
this.releaseMax(nodeArr);
}
public int CompareTo(object other)
{
LFUNode <K, V> lFUNode = other as LFUNode <K, V>;
if (this.RefCount != lFUNode.RefCount)
{
return(-this.RefCount.CompareTo(lFUNode.RefCount));
}
TimeSpan timeSpan = this.UserTime.Subtract(lFUNode.UserTime);
if (timeSpan.Milliseconds == 0)
{
return(0);
}
return((timeSpan.Milliseconds <= 0) ? 1 : -1);
}
public void Put(K key, V value, int refCount = 1)
{
LFUNode <K, V> lFUNode;
if (!this.linked.ContainsKey(key))
{
lFUNode = new LFUNode <K, V>(key, value);
this.linked.Add(key, lFUNode);
}
lFUNode = this.linked[key];
lFUNode.Value = value;
lFUNode.UserTime = DateTime.UtcNow;
lFUNode.RefCount += refCount;
if (this.linked.Count > this.capacityMax)
{
this.release(lFUNode);
}
}
public void Put(K key, V value)
{
Node <K, V> node = this.ruCache.GetNode(key);
if (node != null)
{
this.ruCache.RemoveKey(key);
this.fuCache.Put(key, value, 1);
return;
}
node = this.fuCache.GetNode(key);
if (node != null)
{
return;
}
int num = this.initCapactity + this.initCapactity / 2;
node = this.ruGhostCache.GetNode(key);
if (node != null)
{
if (this.ruCache.Full && this.ruCache.Capactity < num)
{
this.ruCache.Capactity++;
this.fuCache.CapacityMax--;
}
this.ruCache.Put(key, value);
this.ruGhostCache.RemoveKey(key);
return;
}
node = this.fuGhostCache.GetNode(key);
if (node != null)
{
if (this.fuCache.Full && this.fuCache.CapacityMax < num)
{
this.fuCache.CapacityMax++;
this.ruCache.Capactity--;
}
LFUNode <K, V> lFUNode = node as LFUNode <K, V>;
this.fuCache.Put(key, value, lFUNode.RefCount);
this.fuGhostCache.RemoveKey(key);
return;
}
this.ruCache.Put(key, value);
}
private void releaseMax(List <LFUNode <K, V> > nodeArr)
{
if (Size <= capacityMax)
{
return;
}
LFUNode <K, V> lastNode = nodeArr[nodeArr.Count - 1];
linked.Remove(lastNode.Key);
nodeArr.RemoveAt(nodeArr.Count - 1);
if (DestroyAction != null)
{
DestroyAction(lastNode);
}
releaseMax(nodeArr);
}
// remove target node from current frequency double-linked list,
// and then promote it to higher frequency double-linked list
private void PromoteNode(LFUNode node)
{
LFUDoubleLinkedList dll = frequencyMap[node.Frequency];
dll.RemoveNode(node);
if (dll.Count == 0)
{
frequencyMap.Remove(node.Frequency);
if (minFrequency == node.Frequency)
{
minFrequency++;
}
}
node.Frequency++;
if (!frequencyMap.ContainsKey(node.Frequency))
{
frequencyMap[node.Frequency] = new LFUDoubleLinkedList();
}
frequencyMap[node.Frequency].AddToTop(node);
}
private void Add(int key, int value)
{
if (Values.Count == size)
{
return; // size zero or eviction didn't succeed
}
var newkv = new LFUNode(key, value);
var node = new LinkedListNode <LFUNode>(newkv);
var newFreq = 1;
Values.Add(key, node);
Counts.Add(key, newFreq);
if (!Frequencies.ContainsKey(newFreq))
{
Frequencies.Add(newFreq, new LinkedList <LFUNode>());
}
// Insert the node to the new frequency list
Frequencies[newFreq].AddLast(node);
}
public void Add(int key, int value)
{
if (capacity == 0)
{
return;
}
// update the value of that node and then promote the node
if (map.ContainsKey(key))
{
LFUNode node = map[key];
node.Value = value;
PromoteNode(node);
}
else
{
// remove the LFU node
if (count == capacity)
{
LFUDoubleLinkedList dll = frequencyMap[minFrequency];
LFUNode lfuNode = dll.RemoveLFUNode();
if (dll.Count == 0)
{
frequencyMap.Remove(minFrequency);
}
map.Remove(lfuNode.Key);
count--;
}
// add a new node
LFUNode node = new LFUNode(key, value);
minFrequency = node.Frequency;
map[key] = node;
if (!frequencyMap.ContainsKey(node.Frequency))
{
frequencyMap[node.Frequency] = new LFUDoubleLinkedList();
}
frequencyMap[node.Frequency].AddToTop(node);
count++;
}
}
public override string ToString()
{
LFUNode <K, V>[] array = new LFUNode <K, V> [this.linked.Count];
this.linked.Values.CopyTo(array, 0);
Array.Sort <LFUNode <K, V> >(array);
StringBuilder stringBuilder = new StringBuilder();
LFUNode <K, V>[] array2 = array;
for (int i = 0; i < array2.Length; i++)
{
LFUNode <K, V> lFUNode = array2[i];
stringBuilder.AppendFormat("refCount:{1} , dataTime : {2} key :{0} / {3}\r\n", new object[]
{
lFUNode.Key,
lFUNode.RefCount,
lFUNode.UserTime.Millisecond,
lFUNode.Value
});
}
return(stringBuilder.ToString());
}
/// <summary>
/// 添加缓存元素
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
public void Put(K key, V value, int refCount = 1)
{
LFUNode <K, V> lfuNode = null;
if (!linked.ContainsKey(key))
{
lfuNode = new LFUNode <K, V>(key, value);
linked.Add(key, lfuNode);
}
lfuNode = linked[key];
lfuNode.Value = value;
lfuNode.UserTime = System.DateTime.UtcNow;
lfuNode.RefCount += refCount;
//如果满容，进行排序释放
if (linked.Count > capacityMax)
{
release(lfuNode);
}
}
/// <summary>
/// 释放使用率最小的结节
/// </summary>
private void release(LFUNode <K, V> lastNode)
{
LFUNode <K, V>[] nodeArr = new LFUNode <K, V> [linked.Count];
linked.Values.CopyTo(nodeArr, 0);
Array.Sort(nodeArr);
for (int i = nodeArr.Length - 1; i >= 0; i--)
{
//删除末尾,如果最末尾是最新加入的，则删除前一个
if (nodeArr[i] == lastNode)
{
continue;
}
if (mDestroy != null)
{
bool destroy = mDestroy.CanDestroy(nodeArr[i]);
if (destroy)
{
linked.Remove(nodeArr[i].Key);
mDestroy.DestroyNode(nodeArr[i]);
break;
}
}
else
{
linked.Remove(nodeArr[i].Key);
if (DestroyAction != null)
{
DestroyAction.Invoke(nodeArr[i]);
}
break;
}
}
}
/// <summary>
/// 释放使用率最小的结节
/// </summary>
private void release(LFUNode <K, V> lastNode)
{
LFUNode <K, V>[] nodeArr = new LFUNode <K, V> [linked.Count];
linked.Values.CopyTo(nodeArr, 0);
Array.Sort(nodeArr);
//删除末尾,如果最末尾是最新加入的，则删除前一个
if (lastNode == null || nodeArr[nodeArr.Length - 1] != lastNode)
{
lastNode = nodeArr[nodeArr.Length - 1];
}
else
{
lastNode = nodeArr[nodeArr.Length - 2];
}
linked.Remove(lastNode.Key);
if (DestroyAction != null)
{
DestroyAction(lastNode);
}
}