132 lines
3.6 KiB
C#
132 lines
3.6 KiB
C#
using System;
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using System.Diagnostics;
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using System.Linq;
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namespace AppLimit.CloudComputing.SharpBox.Common.Cache
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{
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public abstract class CachedDictionaryBase<T>
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{
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protected string _baseKey;
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protected Func<T, bool> _cacheCodition;
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protected long ClearId
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{
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get { return DateTime.UtcNow.Ticks; }
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}
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public T this[string key]
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{
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get { return Get(key); }
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}
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public T this[Func<T> @default]
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{
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get { return Get(@default); }
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}
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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 abstract void Reset(string rootKey, string key);
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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 abstract void Add(string rootkey, string key, T newValue);
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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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protected string BuildKey(string key, string rootkey)
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{
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return string.Format("{0}-{1}-{2}", _baseKey, rootkey, key);
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}
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protected abstract object GetObjectFromCache(string fullKey);
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public T Get(Func<T> @default)
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{
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string 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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protected virtual bool FitsCondition(object cached)
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{
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return cached != null && cached is T;
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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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#if (DEBUG)
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OnHit(fullKey);
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#endif
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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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#if (DEBUG)
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OnMiss(fullKey);
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#endif
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var newValue = defaults();
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if (_cacheCodition == null || _cacheCodition(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(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 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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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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}
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} |