CacheHelper代码,CSharp代码库,德仔网

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【CSharp】 CacheHelper
作者:Dezai.CN / 发布于2013/3/26/ 701

	using System;
	using System.Web;
	using System.Xml.Linq;
	using System.Web.Caching;
	using System.Collections.Generic;
	using BIReportCenter.ServiceImp.Config;
	using Common.HelperObjects;

	namespace BIReportCenter.ServiceImp.Core
	{
	 public delegate object GetCacheMapper();
	 public delegate T GetCacheInstanceMapper<T>();
	 public delegate List<T> GetCacheInstanceListMapper<T>();
	 public delegate XDocument GetCacheXmlMapper();

	 public static class CacheHelper
	 {
	 /// <summary>
	 /// 获取当前appdomain中的cache
	 /// </summary>
	 public static Cache CurrentCache
	 {
	 get { return HttpRuntime.Cache; }
	 }
	 public static BIReportCenterConfig BIRccInstance
	 { get { return BIReportCenterConfig.Instance; } }
	 /// <summary>
	 /// 向当前缓存中插入键值数据
	 /// </summary>
	 /// <param name="key"></param>
	 /// <param name="obj"></param>
	 /// <param name="expiredDate"></param>
	 /// <param name="sqlDependency"></param>
	 public static void Add(string key, object obj, DateTime expiredDate, CacheDependency sqlDependency = null)
	 {
	 if (obj != null)
	 CurrentCache.Insert(key,
	 obj,
	 sqlDependency,
	 expiredDate,
	 TimeSpan.Zero);
	 }
	
	 /// <summary>
	 /// 从缓存中获取指定键名的数据
	 /// </summary>
	 /// <param name="key"></param>
	 /// <returns></returns>
	 public static object Get(string key)
	 {
	 return CurrentCache.Get(key);
	 }
	
	 /// <summary>
	 /// 从缓存中清除指定键名的数据
	 /// </summary>
	 /// <param name="key"></param>
	 /// <returns></returns>
	 public static object Remove(string key)
	 {
	 return CurrentCache.Remove(key);
	 }
	 /// <summary>
	 /// 从IIS Cache中获取缓存对象
	 /// </summary>
	 /// <typeparam name="T"></typeparam>
	 /// <param name="key"></param>
	 /// <param name="expiredDate"></param>
	 /// <returns></returns>
	 private static T GetInstanceByIIS<T>(string key)
	 {
	 ArgumentHelper.AssertNotNullOrEmpty(key);
	 object result = Get(key);
	 if (result == null)
	 {
	 return default(T);
	 }
	 return (T)result;
	 }

	 /// <summary>
	 /// 是否启用IISCache
	 /// </summary>
	 /// <returns></returns>
	 public static Boolean IISCacheEnable()
	 {
	 return BIRccInstance.IISConfigs[0].Enable;
	 }
	 /// <summary>
	 /// 查询对象
	 /// </summary>
	 /// <typeparam name="T">对象类型</typeparam>
	 /// <param name="key">检索缓存的key</param>
	 /// <param name="cacheMapper">数据源</param>
	 /// <returns></returns>
	 public static T GetInstance<T>(string key, GetCacheInstanceMapper<T> cacheMapper, CacheDependency sqlDependency = null)
	 {
	 ArgumentHelper.AssertNotNullOrEmpty(key);
	 T result = default(T);
	 //获取缓存类型 key
	 string cacheTypeKey = GetCacheTypeKey(key);
	 if (IISCacheEnable())
	 {
	 //从IIS Cache中获取对象
	 result = GetInstanceByIIS<T>(key);
	 }
	 if (object.Equals(result, default(T))) //说明从IISCache中没有取到对象。
	 {
	 //从数据库获取数据
	 result = cacheMapper();
	 //根据缓存类型key 获取该类型过期时间
	 int cacheTimeOut = GetCacheTimeOut(cacheTypeKey);
	 //给datarelay Cache对象赋值。
	 if (IISCacheEnable())
	 Add(key, result, DateTime.Now.AddMinutes(cacheTimeOut), sqlDependency);
	 }
	 return result;
	 }
	 /// <summary>
	 /// 得到过期时间
	 /// </summary>
	 /// <param name="key"></param>
	 /// <returns></returns>
	 public static int GetCacheTimeOut(string cacheKey)
	 {
	 ArgumentHelper.AssertNotNullOrEmpty(cacheKey);
	 int result = 30;
	 bool isContainKey = false;
	 if (BIRccInstance.CacheTimeOut != null && BIRccInstance.CacheTimeOut.Count > 0)
	 {
	 foreach (CacheItem ci in BIRccInstance.CacheTimeOut)
	 {
	 isContainKey = (isContainKey || string.Equals(ci.Name, cacheKey, StringComparison.OrdinalIgnoreCase));
	 if (isContainKey)
	 {
	 result = ci.TimeOut;
	 return result;
	 }
	 }

	 }
	 return result;
	 }
	 /// <summary>
	 /// 获取缓存类型key
	 /// </summary>
	 /// <param name="key"></param>
	 /// <returns></returns>
	 public static string GetCacheTypeKey(string key)
	 {
	 ArgumentHelper.AssertNotNullOrEmpty(key);
	 return key.Split(new char[] { '≮' })[0];
	 }

	 }
	}
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