用匿名函数来更方便的使用缓存
2009-03-19 08:21:05 来源:WEB开发网实现代码如下:
缓存代码
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
namespace Evlon.Utils
{
public interface ICache<TData>
{
TData Get(object key);
void Set(object key, TData data);
}
public interface ICacheManager<TData> : ICache<TData>
{
Func<object, TData> SourceGetter { get; }
}
public class SimpleCache<TData> : ICache<TData>
{
private Dictionary<object, TData> cache = new Dictionary<object, TData>();
#region ICacheManager<TData> 成员
public TData Get(object key)
{
return cache[key];
}
public void Set(object key, TData data)
{
cache[key] = data;
}
#endregion
}
public class TimeoutCache<TData> : ICache<TData>
{
public TimeSpan Expire {get;set;}
private DateTime timeLastScan = DateTime.Now;
private Dictionary<object, KeyValuePair<TData, DateTime>> cache = new Dictionary<object, KeyValuePair<TData, DateTime>>();
public TimeoutCache()
{
Expire = TimeSpan.FromMinutes(5);
}
private void TryClearExpireObject()
{
TimeSpan ts = DateTime.Now - timeLastScan;
if (ts.TotalSeconds > Expire.TotalSeconds / 2)
{
timeLastScan = DateTime.Now;
cache.Where(kv => kv.Value.Value > DateTime.Now.Subtract(Expire)).ToList().ForEach(kv =>
{
cache.Remove(kv.Key);
});
}
}
#region ICacheManager<TData> 成员
public TData Get(object key)
{
TryClearExpireObject();
if(!cache.ContainsKey(key))
return default(TData);
KeyValuePair<TData, DateTime> kv = cache[key];
if (kv.Value.Add(Expire) < DateTime.Now)
{
cache.Remove(key);
return default(TData);
}
return kv.Key;
}
public void Set(object key, TData data)
{
cache[key] = new KeyValuePair<TData, DateTime>(data, DateTime.Now);
}
#endregion
}
public class CacheManager<TData> : ICacheManager<TData>
{
private ICache<TData> cache = null;
public Func<object, TData> SourceGetter { get; private set; }
public CacheManager(ICache<TData> cache, Func<object, TData> sourceGetter)
{
this.cache = cache;
this.SourceGetter = sourceGetter;
}
#region ICacheGetter<TData> 成员
public TData Get(object key)
{
TData data = cache.Get(key);
if (data != null)
return data;
data = this.SourceGetter(key);
cache.Set(key, data);
return data;
}
public void Set(object key, TData data)
{
cache.Set(key, data);
}
#endregion
}
}
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