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- using System;
- using System.Collections;
- using System.Collections.Generic;
- using System.Diagnostics;
- namespace OpenSim.Framework
- {
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- public class CnmMemoryCache<TKey, TValue> : ICnmCache<TKey, TValue>
- {
-
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-
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- public const int DefaultMaxCount = 4096;
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- public const long DefaultMaxSize = 134217728;
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-
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- private const int DefaultOperationsBetweenTimeChecks = 40;
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- public static readonly TimeSpan DefaultExpirationTime = TimeSpan.FromMinutes(30.0);
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- public static readonly TimeSpan MinExpirationTime = TimeSpan.FromSeconds(10.0);
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-
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- public readonly IEqualityComparer<TKey> Comparer;
-
-
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- private TimeSpan m_expirationTime = DefaultExpirationTime;
-
-
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- private int m_generationBucketCount;
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-
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- private int m_generationElementCount;
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-
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- private long m_generationMaxSize;
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-
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- private int m_maxCount;
-
-
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- private long m_maxElementSize;
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-
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- private long m_maxSize;
-
-
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- private IGeneration m_newGeneration;
-
-
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- private IGeneration m_oldGeneration;
-
-
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- private int m_operationsBetweenTimeChecks = DefaultOperationsBetweenTimeChecks;
-
-
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- private readonly object m_syncRoot = new object();
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- private int m_version;
-
-
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- public CnmMemoryCache()
- : this(DefaultMaxSize)
- {
- }
-
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-
-
-
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- public CnmMemoryCache(long maximalSize)
- : this(maximalSize, DefaultMaxCount)
- {
- }
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- public CnmMemoryCache(long maximalSize, int maximalCount)
- : this(maximalSize, maximalCount, DefaultExpirationTime)
- {
- }
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-
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- public CnmMemoryCache(long maximalSize, int maximalCount, TimeSpan expirationTime)
- : this(maximalSize, maximalCount, expirationTime, EqualityComparer<TKey>.Default)
- {
- }
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- public CnmMemoryCache(long maximalSize,
- int maximalCount,
- TimeSpan expirationTime,
- IEqualityComparer<TKey> comparer)
- {
- if (comparer == null)
- throw new ArgumentNullException("comparer");
- if (expirationTime < MinExpirationTime)
- expirationTime = MinExpirationTime;
- if (maximalCount < 8)
- maximalCount = 8;
- if (maximalSize < 8)
- maximalSize = 8;
- if (maximalCount > maximalSize)
- maximalCount = (int) maximalSize;
- Comparer = comparer;
- m_expirationTime = expirationTime;
- m_maxSize = maximalSize;
- m_maxCount = maximalCount;
- Initialize();
- }
-
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- protected virtual void AddToNewGeneration(int bucketIndex, TKey key, TValue value, long size)
- {
-
- if (!m_newGeneration.Set(bucketIndex, key, value, size))
- {
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- RecycleGenerations();
- m_newGeneration.Set(bucketIndex, key, value, size);
- }
- m_version++;
- }
-
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- protected virtual int GetBucketIndex(TKey key)
- {
- return (Comparer.GetHashCode(key) & 0x7FFFFFFF) % m_generationBucketCount;
- }
-
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-
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-
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- protected virtual void PurgeGeneration(IGeneration generation)
- {
- generation.Clear();
- m_version++;
- }
-
-
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- private void CheckExpired()
- {
-
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- m_operationsBetweenTimeChecks--;
- if (m_operationsBetweenTimeChecks <= 0)
- PurgeExpired();
- }
-
-
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- private void Initialize()
- {
- m_version++;
- m_generationMaxSize = MaxSize / 2;
- MaxElementSize = MaxSize / 8;
- m_generationElementCount = MaxCount / 2;
-
- m_generationBucketCount = PrimeNumberHelper.GetPrime(m_generationElementCount);
- m_newGeneration = new HashGeneration(this);
- m_oldGeneration = new HashGeneration(this);
- m_oldGeneration.MakeOld();
- }
-
-
-
- private void RecycleGenerations()
- {
-
- IGeneration temp = m_newGeneration;
- m_newGeneration = m_oldGeneration;
- m_newGeneration.Clear();
- m_oldGeneration = temp;
- m_oldGeneration.MakeOld();
- }
- #region Nested type: Enumerator
-
-
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- private class Enumerator : IEnumerator<KeyValuePair<TKey, TValue>>
- {
-
-
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- private int m_currentEnumerator = -1;
-
-
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- private readonly IEnumerator<KeyValuePair<TKey, TValue>>[] m_generationEnumerators =
- new IEnumerator<KeyValuePair<TKey, TValue>>[2];
-
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-
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-
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- public Enumerator(CnmMemoryCache<TKey, TValue> cache)
- {
- m_generationEnumerators[ 0 ] = cache.m_newGeneration.GetEnumerator();
- m_generationEnumerators[ 1 ] = cache.m_oldGeneration.GetEnumerator();
- }
- #region IEnumerator<KeyValuePair<TKey,TValue>> Members
-
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-
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- public KeyValuePair<TKey, TValue> Current
- {
- get
- {
- if (m_currentEnumerator == -1 || m_currentEnumerator >= m_generationEnumerators.Length)
- throw new InvalidOperationException();
- return m_generationEnumerators[ m_currentEnumerator ].Current;
- }
- }
-
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-
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-
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- object IEnumerator.Current
- {
- get { return Current; }
- }
-
-
-
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- public void Dispose()
- {
- }
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-
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- public bool MoveNext()
- {
- if (m_currentEnumerator == -1)
- m_currentEnumerator = 0;
- while (m_currentEnumerator < m_generationEnumerators.Length)
- {
- if (m_generationEnumerators[ m_currentEnumerator ].MoveNext())
- return true;
- m_currentEnumerator++;
- }
- return false;
- }
-
-
-
-
-
-
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- public void Reset()
- {
- foreach (IEnumerator<KeyValuePair<TKey, TValue>> enumerator in m_generationEnumerators)
- {
- enumerator.Reset();
- }
- m_currentEnumerator = -1;
- }
- #endregion
- }
- #endregion
- #region Nested type: HashGeneration
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- private class HashGeneration : IGeneration
- {
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- private bool m_accessedSinceLastTimeCheck;
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- private readonly int[] m_buckets;
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-
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- private readonly CnmMemoryCache<TKey, TValue> m_cache;
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- private readonly Element[] m_elements;
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- private DateTime m_expirationTime1;
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- private int m_firstFreeElement;
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- private int m_freeCount;
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- private bool m_newGeneration;
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- private int m_nextUnusedElement;
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-
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- private long m_size;
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-
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- public HashGeneration(CnmMemoryCache<TKey, TValue> cache)
- {
- m_cache = cache;
- m_elements = new Element[m_cache.m_generationElementCount];
- m_buckets = new int[m_cache.m_generationBucketCount];
- Clear();
- }
-
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- private int FindElementIndex(int bucketIndex, TKey key, bool moveToFront, out int previousIndex)
- {
- previousIndex = -1;
- int elementIndex = m_buckets[ bucketIndex ];
- while (elementIndex >= 0)
- {
- if (m_cache.Comparer.Equals(key, m_elements[ elementIndex ].Key))
- {
-
- if (moveToFront && previousIndex >= 0)
- {
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- m_elements[ previousIndex ].Next = m_elements[ elementIndex ].Next;
- m_elements[ elementIndex ].Next = m_buckets[ bucketIndex ];
- m_buckets[ bucketIndex ] = elementIndex;
- previousIndex = 0;
- }
- return elementIndex;
- }
- previousIndex = elementIndex;
- elementIndex = m_elements[ elementIndex ].Next;
- }
- return -1;
- }
-
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- private void RemoveElement(int bucketIndex, int entryIndex, int previousIndex)
- {
- if (previousIndex >= 0)
- m_elements[ previousIndex ].Next = m_elements[ entryIndex ].Next;
- else
- m_buckets[ bucketIndex ] = m_elements[ entryIndex ].Next;
- Size -= m_elements[ entryIndex ].Size;
- m_elements[ entryIndex ].Value = default(TValue);
- m_elements[ entryIndex ].Key = default(TKey);
-
- m_elements[ entryIndex ].Next = m_firstFreeElement;
- m_firstFreeElement = entryIndex;
- m_freeCount++;
- }
- #region Nested type: Element
-
-
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- private struct Element
- {
-
-
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- public TKey Key;
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- public int Next;
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- public long Size;
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-
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- public TValue Value;
-
-
-
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-
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- public bool IsFree
- {
- get { return Size == 0; }
- }
- }
- #endregion
- #region Nested type: Enumerator
-
-
-
- private class Enumerator : IEnumerator<KeyValuePair<TKey, TValue>>
- {
-
-
-
- private KeyValuePair<TKey, TValue> m_current;
-
-
-
- private int m_currentIndex;
-
-
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- private readonly HashGeneration m_generation;
-
-
-
-
-
-
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- private readonly int m_version;
-
-
-
-
-
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- public Enumerator(HashGeneration generation)
- {
- m_generation = generation;
- m_version = m_generation.m_cache.m_version;
- }
- #region IEnumerator<KeyValuePair<TKey,TValue>> Members
-
-
-
-
-
-
-
-
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- public KeyValuePair<TKey, TValue> Current
- {
- get
- {
- if (m_currentIndex == 0 || m_currentIndex >= m_generation.Count)
- throw new InvalidOperationException();
- return m_current;
- }
- }
-
-
-
-
-
-
-
-
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- object IEnumerator.Current
- {
- get { return Current; }
- }
-
-
-
-
- public void Dispose()
- {
- }
-
-
-
-
-
-
-
-
-
- public bool MoveNext()
- {
- if (m_version != m_generation.m_cache.m_version)
- throw new InvalidOperationException();
- while (m_currentIndex < m_generation.Count)
- {
- if (m_generation.m_elements[ m_currentIndex ].IsFree)
- {
- m_currentIndex++;
- continue;
- }
- m_current = new KeyValuePair<TKey, TValue>(m_generation.m_elements[ m_currentIndex ].Key,
- m_generation.m_elements[ m_currentIndex ].Value);
- m_currentIndex++;
- return true;
- }
- m_current = new KeyValuePair<TKey, TValue>();
- return false;
- }
-
-
-
-
-
-
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- public void Reset()
- {
- if (m_version != m_generation.m_cache.m_version)
- throw new InvalidOperationException();
- m_currentIndex = 0;
- }
- #endregion
- }
- #endregion
- #region IGeneration Members
-
-
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- public bool AccessedSinceLastTimeCheck
- {
- get { return m_accessedSinceLastTimeCheck; }
- set { m_accessedSinceLastTimeCheck = value; }
- }
-
-
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- public int Count
- {
- get { return m_nextUnusedElement - m_freeCount; }
- }
-
-
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- public DateTime ExpirationTime
- {
- get { return m_expirationTime1; }
- set { m_expirationTime1 = value; }
- }
-
-
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- public long Size
- {
- get { return m_size; }
- private set { m_size = value; }
- }
-
-
-
-
-
-
-
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- public void Clear()
- {
- for (int i = m_buckets.Length - 1 ; i >= 0 ; i--)
- {
- m_buckets[ i ] = -1;
- }
- Array.Clear(m_elements, 0, m_elements.Length);
- Size = 0;
- m_firstFreeElement = -1;
- m_freeCount = 0;
- m_nextUnusedElement = 0;
- m_newGeneration = true;
- ExpirationTime = DateTime.MaxValue;
- }
-
-
-
-
-
-
-
-
-
-
-
-
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- public bool Contains(int bucketIndex, TKey key)
- {
- int previousIndex;
- if (FindElementIndex(bucketIndex, key, true, out previousIndex) == -1)
- return false;
- AccessedSinceLastTimeCheck = true;
- return true;
- }
-
-
-
-
-
-
-
- public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
- {
- return new Enumerator(this);
- }
-
-
-
-
-
-
-
- public void MakeOld()
- {
- m_newGeneration = false;
- }
-
-
-
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-
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-
-
-
-
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- public bool Remove(int bucketIndex, TKey key)
- {
- int previousIndex;
- int entryIndex = FindElementIndex(bucketIndex, key, false, out previousIndex);
- if (entryIndex != -1)
- {
- RemoveElement(bucketIndex, entryIndex, previousIndex);
- AccessedSinceLastTimeCheck = true;
- return true;
- }
- return false;
- }
-
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-
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- public bool Set(int bucketIndex, TKey key, TValue value, long size)
- {
- Debug.Assert(m_newGeneration, "It is possible to insert new elements only to newest generation.");
- Debug.Assert(size > 0, "New element size should be more than 0.");
- int previousIndex;
- int elementIndex = FindElementIndex(bucketIndex, key, true, out previousIndex);
- if (elementIndex == -1)
- {
-
- if (Size + size > m_cache.m_generationMaxSize ||
- (m_nextUnusedElement == m_cache.m_generationElementCount && m_freeCount == 0))
- {
-
- return false;
- }
-
- Size += size;
-
- if (m_firstFreeElement != -1)
- {
-
- elementIndex = m_firstFreeElement;
- m_firstFreeElement = m_elements[ elementIndex ].Next;
- m_freeCount--;
- }
- else
- {
-
- elementIndex = m_nextUnusedElement;
- m_nextUnusedElement++;
- }
- Debug.Assert(m_elements[ elementIndex ].IsFree, "Allocated element is not free.");
-
- m_elements[ elementIndex ].Next = m_buckets[ bucketIndex ];
- m_buckets[ bucketIndex ] = elementIndex;
-
- m_elements[ elementIndex ].Key = key;
- }
- else
- {
-
- if (Size - m_elements[ elementIndex ].Size + size > m_cache.m_generationMaxSize)
- {
-
-
-
- RemoveElement(bucketIndex, elementIndex, previousIndex);
- return false;
- }
-
- Size = Size - m_elements[ elementIndex ].Size + size;
- }
-
- m_elements[ elementIndex ].Value = value;
- m_elements[ elementIndex ].Size = size;
-
- AccessedSinceLastTimeCheck = true;
- return true;
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public bool TryGetValue(int bucketIndex, TKey key, out TValue value, out long size)
- {
-
- int previousIndex;
- int elementIndex = FindElementIndex(bucketIndex, key, m_newGeneration, out previousIndex);
- if (elementIndex == -1)
- {
- value = default(TValue);
- size = 0;
- return false;
- }
- value = m_elements[ elementIndex ].Value;
- size = m_elements[ elementIndex ].Size;
- if (!m_newGeneration)
- {
-
- RemoveElement(bucketIndex, elementIndex, previousIndex);
- }
- AccessedSinceLastTimeCheck = true;
- return true;
- }
-
-
-
-
-
-
-
- IEnumerator IEnumerable.GetEnumerator()
- {
- return GetEnumerator();
- }
- #endregion
- }
- #endregion
- #region Nested type: IGeneration
-
-
-
-
-
-
-
-
-
-
-
-
- protected interface IGeneration : IEnumerable<KeyValuePair<TKey, TValue>>
- {
-
-
-
- bool AccessedSinceLastTimeCheck { get; set; }
-
-
-
- int Count { get; }
-
-
-
- DateTime ExpirationTime { get; set; }
-
-
-
- long Size { get; }
-
-
-
-
-
-
-
-
- void Clear();
-
-
-
-
-
-
-
-
-
-
-
-
-
- bool Contains(int bucketIndex, TKey key);
-
-
-
-
-
-
-
- void MakeOld();
-
-
-
-
-
-
-
-
-
-
-
-
- bool Remove(int bucketIndex, TKey key);
-
-
-
-
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-
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-
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-
-
-
-
-
-
-
-
-
-
-
-
- bool Set(int bucketIndex, TKey key, TValue value, long size);
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- bool TryGetValue(int bucketIndex, TKey key, out TValue value, out long size);
- }
- #endregion
- #region ICnmCache<TKey,TValue> Members
-
-
-
-
-
-
-
-
-
-
-
-
-
- public int Count
- {
- get { return m_newGeneration.Count + m_oldGeneration.Count; }
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public TimeSpan ExpirationTime
- {
- get { return m_expirationTime; }
- set
- {
- if (value < MinExpirationTime)
- value = MinExpirationTime;
- if (m_expirationTime == value)
- return;
- m_newGeneration.ExpirationTime = (m_newGeneration.ExpirationTime - m_expirationTime) + value;
- m_oldGeneration.ExpirationTime = (m_oldGeneration.ExpirationTime - m_expirationTime) + value;
- m_expirationTime = value;
- PurgeExpired();
- }
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public bool IsCountLimited
- {
- get { return true; }
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public bool IsSizeLimited
- {
- get { return true; }
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public bool IsSynchronized
- {
- get { return false; }
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public bool IsTimeLimited
- {
- get { return ExpirationTime != TimeSpan.MaxValue; }
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
- public int MaxCount
- {
- get { return m_maxCount; }
- set
- {
- if (value < 8)
- value = 8;
- if (m_maxCount == value)
- return;
- m_maxCount = value;
- Initialize();
- }
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public long MaxElementSize
- {
- get { return m_maxElementSize; }
- private set { m_maxElementSize = value; }
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public long MaxSize
- {
- get { return m_maxSize; }
- set
- {
- if (value < 8)
- value = 8;
- if (m_maxSize == value)
- return;
- m_maxSize = value;
- Initialize();
- }
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public long Size
- {
- get { return m_newGeneration.Size + m_oldGeneration.Size; }
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public object SyncRoot
- {
- get { return m_syncRoot; }
- }
-
-
-
-
-
-
-
-
- public void Clear()
- {
- m_newGeneration.Clear();
- m_oldGeneration.Clear();
- m_oldGeneration.MakeOld();
- m_version++;
- }
-
-
-
-
-
-
-
- public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
- {
- return new Enumerator(this);
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public void PurgeExpired()
- {
- m_operationsBetweenTimeChecks = DefaultOperationsBetweenTimeChecks;
- if (!IsTimeLimited)
- return;
- DateTime now = DateTime.Now;
- if (m_newGeneration.AccessedSinceLastTimeCheck)
- {
-
-
- m_newGeneration.ExpirationTime = now + ExpirationTime;
- m_newGeneration.AccessedSinceLastTimeCheck = false;
- }
- else if (m_newGeneration.ExpirationTime < now)
- {
-
-
- PurgeGeneration(m_newGeneration);
- PurgeGeneration(m_oldGeneration);
- return;
- }
- if (m_oldGeneration.ExpirationTime < now)
- PurgeGeneration(m_oldGeneration);
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public void Remove(TKey key)
- {
- if (key == null)
- throw new ArgumentNullException("key");
- int bucketIndex = GetBucketIndex(key);
- if (!m_newGeneration.Remove(bucketIndex, key))
- {
- if (!m_oldGeneration.Remove(bucketIndex, key))
- {
- CheckExpired();
- return;
- }
- }
- CheckExpired();
- m_version++;
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public void RemoveRange(IEnumerable<TKey> keys)
- {
- if (keys == null)
- throw new ArgumentNullException("keys");
- foreach (TKey key in keys)
- {
- if (key == null)
- continue;
- int bucketIndex = GetBucketIndex(key);
- if (!m_newGeneration.Remove(bucketIndex, key))
- m_oldGeneration.Remove(bucketIndex, key);
- }
- CheckExpired();
- m_version++;
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public bool Set(TKey key, TValue value, long size)
- {
- if (key == null)
- throw new ArgumentNullException("key");
- if (size < 0)
- throw new ArgumentOutOfRangeException("size", size, "Value's size can't be less than 0.");
- if (size > MaxElementSize)
- {
-
- Remove(key);
- return false;
- }
- if (size == 0)
- size = 1;
- int bucketIndex = GetBucketIndex(key);
- m_oldGeneration.Remove(bucketIndex, key);
- AddToNewGeneration(bucketIndex, key, value, size);
- CheckExpired();
- return true;
- }
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- public bool TryGetValue(TKey key, out TValue value)
- {
- if (key == null)
- throw new ArgumentNullException("key");
- int bucketIndex = GetBucketIndex(key);
- long size;
- if (m_newGeneration.TryGetValue(bucketIndex, key, out value, out size))
- {
- CheckExpired();
- return true;
- }
- if (m_oldGeneration.TryGetValue(bucketIndex, key, out value, out size))
- {
-
- AddToNewGeneration(bucketIndex, key, value, size);
- CheckExpired();
- return true;
- }
- CheckExpired();
- return false;
- }
-
-
-
-
-
-
-
- IEnumerator IEnumerable.GetEnumerator()
- {
- return GetEnumerator();
- }
- #endregion
- }
- }
|