[转载].Net通用基础框架（.Net Common Infrastructure）-缓存

mikel
ASP.NET
2011-03-17
77热度
0评论

[转载].Net通用基础框架（.Net Common Infrastructure）-缓存 - 张艺聍 - 博客园.

缓存可以提高网站性能，减轻数据库压力。网站中常用的缓存分为业务数据缓存和页面文件缓存两类，其中业务数据缓存常用AspnetCache，Memcached等，而页面文件缓存常用Squid和Nginx，今天介绍的内容是业务数据缓存。

Common.Cache类图

缓存接口ICache：使用Add方法时，如果key存在，则返回false。使用Set方法时，key不存在则添加，否则更新。

[csharp]
using System;
using System.Collections.Generic;

namespace Common.Cache
{
///

/// 缓存
///

public interface ICache
{
///

/// 增加
///

/// 类型
/// 键 /// 值 /// 结果
bool Add(string key, T value);

///

/// 增加
///

/// 类型
/// 键 /// 值 /// 持续时间 /// 结果
bool Add(string key, T value, TimeSpan duration);

///

/// 清除
///

void Clear();

///

/// 获取
///

/// 类型
/// 键 /// 值
T Get(string key);

///

/// 多线程获取
///

/// 键集合 /// 值集合
IDictionary MultiGet(IList keys);

///

/// 移除
///

/// 键 void Remove(string key);

///

/// 设置
///

/// 类型
/// 键 /// 值 /// 结果
bool Set(string key, T value);

///

/// 设置
///

/// 类型
/// 键 /// 值 /// 持续时间 /// 结果
bool Set(string key, T value, TimeSpan duration);
}
}

[/csharp]
缓存基类
[csharp]
using System;
using System.Collections.Generic;

namespace Common.Cache
{
///

/// 缓存基类
///

public abstract class CacheBase : ICache
{
private TimeSpan maxDuration = TimeSpan.FromDays(15);

///

/// 最长持续时间
///

public TimeSpan MaxDuration
{
get
{
return this.maxDuration;
}
set
{
this.maxDuration = value;
}
}

///

/// 前缀
///

public string Prefix
{
get;
set;
}

public bool Add(string key, T value)
{
return this.Add(key, value, this.MaxDuration);
}

public abstract bool Add(string key, T value, TimeSpan duration);

public abstract void Clear();

public abstract T Get(string key);

///

/// 获取全名
///

/// 键 /// 全名
public virtual string GetFullName(string key)
{
string result = key;
if (!string.IsNullOrWhiteSpace(this.Prefix))
{
result = string.Format("{0}.{1}", this.Prefix, key);
}

return result;
}

public abstract IDictionary MultiGet(IList keys);

public abstract void Remove(string key);

public bool Set(string key, T value)
{
return this.Set(key, value, this.MaxDuration);
}

public abstract bool Set(string key, T value, TimeSpan duration);
}
}
[/csharp]
Aspnet缓存实现
[csharp]
using System;
using System.Collections;
using System.Collections.Generic;
using System.Web;
using System.Web.Caching;

namespace Common.Cache
{
///

/// Aspnet缓存
///

public class AspnetCache : CacheBase
{
private System.Web.Caching.Cache cache = HttpRuntime.Cache;

///

/// 构造函数
///

public AspnetCache()
: this("Common.Cache")
{

}

///

/// 构造函数
///

/// 前缀 public AspnetCache(string prefix)
{
this.Prefix = prefix;
}

public override bool Add(string key, T value, TimeSpan duration)
{
bool result = false;
if (value != null)
{
if (duration <= TimeSpan.Zero) { duration = this.MaxDuration; } result = this.cache.Add(this.GetFullName(key), value, null, DateTime.Now.Add(duration), System.Web.Caching.Cache.NoSlidingExpiration, CacheItemPriority.Default, null) == null; } return result; } public override void Clear() { // 获取键集合 IList keys = new List();
IDictionaryEnumerator caches = this.cache.GetEnumerator();
while (caches.MoveNext())
{
string key = caches.Key.ToString();
if (key.StartsWith(this.Prefix))
{
keys.Add(key);
}
}
// 移除全部
foreach (string key in keys)
{
this.cache.Remove(key);
}
}

public override T Get(string key)
{
T result = default(T);
object value = this.cache.Get(this.GetFullName(key));
if (value is T)
{
result = (T)value;
}

return result;
}

public override IDictionary MultiGet(IList keys)
{
IDictionary result = new Dictionary();
foreach (string key in keys)
{
result.Add(key, this.Get