123 lines
3.0 KiB
C#
123 lines
3.0 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="QueryCacheKey.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner [....]
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// @backupOwner [....]
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//------------------------------------------------------------------------------
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namespace System.Data.Common.QueryCache
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{
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using System;
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using System.Collections.Generic;
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using System.Text;
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/// <summary>
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/// represents an abstract cache key
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/// </summary>
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internal abstract class QueryCacheKey
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{
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#region Constants
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protected const int EstimatedParameterStringSize = 20;
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#endregion
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#region Fields
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/// <summary>
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/// entry hit counter
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/// </summary>
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private uint _hitCount;
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/// <summary>
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/// aging index
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/// </summary>
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private int _agingIndex;
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/// <summary>
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/// default string comparison kind - Ordinal
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/// </summary>
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protected static StringComparison _stringComparison = StringComparison.Ordinal;
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#endregion
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#region Constructor
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protected QueryCacheKey()
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{
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_hitCount = 1;
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}
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#endregion
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#region Abstract Methods
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/// <summary>
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/// Determines whether two instances of QueryCacheContext are equal.
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/// Equality is value based.
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/// </summary>
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/// <param name="obj"></param>
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/// <returns></returns>
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public abstract override bool Equals( object obj );
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/// <summary>
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/// Returns QueryCacheContext instance HashCode
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/// </summary>
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/// <returns></returns>
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public abstract override int GetHashCode();
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#endregion
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#region Internal API
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/// <summary>
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/// Cache entry hit count
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/// </summary>
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internal uint HitCount
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{
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get
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{
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return _hitCount;
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}
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set
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{
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_hitCount = value;
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}
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}
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/// <summary>
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/// Gets/Sets Aging index for cache entry
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/// </summary>
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internal int AgingIndex
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{
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get
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{
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return _agingIndex;
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}
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set
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{
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_agingIndex = value;
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}
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}
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/// <summary>
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/// Updates hit count
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/// </summary>
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internal void UpdateHit()
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{
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if (uint.MaxValue != _hitCount)
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{
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unchecked { _hitCount++; }
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}
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}
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/// <summary>
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/// default string comparer
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/// </summary>
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/// <param name="s"></param>
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/// <param name="t"></param>
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/// <returns></returns>
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protected virtual bool Equals( string s, string t )
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{
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return String.Equals(s, t, _stringComparison);
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}
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#endregion
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}
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}
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