145 lines
4.3 KiB
C#
145 lines
4.3 KiB
C#
// (c) Copyright Ascensio System SIA 2010-2022
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//
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// This program is a free software product.
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// You can redistribute it and/or modify it under the terms
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// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
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// any third-party rights.
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//
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// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
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// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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//
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// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
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//
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// The interactive user interfaces in modified source and object code versions of the Program must
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// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
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//
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// Pursuant to Section 7(b) of the License you must retain the original Product logo when
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
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// trademark law for use of our trademarks.
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//
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
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// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
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// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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namespace ASC.Collections;
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public abstract class CachedDictionaryBase<T>
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{
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protected string BaseKey { get; set; }
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protected Func<T, bool> Condition { get; set; }
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public T this[string key] => Get(key);
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public T this[Func<T> @default] => Get(@default);
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protected abstract void InsertRootKey(string rootKey);
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public void Clear()
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{
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InsertRootKey(BaseKey);
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}
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public void Clear(string rootKey)
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{
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InsertRootKey(BuildKey(string.Empty, rootKey));
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}
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public void Reset(string key)
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{
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Reset(string.Empty, key);
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}
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public T Get(string key)
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{
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return Get(string.Empty, key, null);
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}
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public T Get(string key, Func<T> defaults)
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{
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return Get(string.Empty, key, defaults);
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}
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public void Add(string key, T newValue)
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{
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Add(string.Empty, key, newValue);
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}
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public bool HasItem(string key)
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{
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return !Equals(Get(key), default(T));
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}
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public T Get(Func<T> @default)
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{
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var key = string.Format("func {0} {2}.{1}({3})", @default.Method.ReturnType, @default.Method.Name,
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@default.Method.DeclaringType.FullName,
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string.Join(",",
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@default.Method.GetGenericArguments().Select(x => x.FullName).ToArray
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()));
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return Get(key, @default);
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}
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public virtual T Get(string rootkey, string key, Func<T> defaults)
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{
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var fullKey = BuildKey(key, rootkey);
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var objectCache = GetObjectFromCache(fullKey);
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if (FitsCondition(objectCache))
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{
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OnHit(fullKey);
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return ReturnCached(objectCache);
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}
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if (defaults != null)
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{
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OnMiss(fullKey);
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var newValue = defaults();
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if (Condition == null || Condition(newValue))
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{
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Add(rootkey, key, newValue);
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}
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return newValue;
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}
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return default;
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}
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public abstract void Add(string rootkey, string key, T newValue);
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public abstract void Reset(string rootKey, string key);
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protected virtual bool FitsCondition(object cached)
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{
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return cached is T;
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}
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protected virtual T ReturnCached(object objectCache)
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{
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return (T)objectCache;
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}
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protected string BuildKey(string key, string rootkey)
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{
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return $"{BaseKey}-{rootkey}-{key}";
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}
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protected abstract object GetObjectFromCache(string fullKey);
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[Conditional("DEBUG")]
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protected virtual void OnHit(string fullKey)
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{
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Debug.Print("cache hit:{0}", fullKey);
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}
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[Conditional("DEBUG")]
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protected virtual void OnMiss(string fullKey)
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{
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Debug.Print("cache miss:{0}", fullKey);
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}
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} |