Microsoft Enterprise Library: Cache 模块

    Microsoft Enterprise Library中的Cache模块能在多种场景中提供缓存功能：Web程序，桌面程序，WPF程序。我们可以配置Cache模块的缓存处理器，目前系统自带3个缓存处理器：In-Memory，Isolated Storage Cache Store 和 Data Cache Storage。 并且我们还能实现自己的缓存处理器，只需要实现接口 IBackingStore，我们又可以发明自己的轮子啦：）

In-Memory：保存在内存中。  

Isolated Storage Cache Store：系统将缓存的信息保存在独立文件中（C:\Users\<<user name>>\AppData\Local\IsolatedStorage）。

Data Cache Storage：将缓存数据保存在数据库中。

Custom Cache Storage：自己扩展的处理器。我们可以将数据保存在注册表中或文本文件中。

 

In-Memory

            ICacheManager cacheManager = EnterpriseLibraryContainer.Current.GetInstance<ICacheManager>();            cacheManager.Add("A", "This is letter A.");            cacheManager.Add("A", "This is letter A.");            cacheManager.Add("B", "This is letter B.");            cacheManager.Add("C", "This is letter C.");            cacheManager.Add("D", "This is letter D.");            cacheManager.Add("E", "This is letter E.");            Console.WriteLine(string.Format("currently there are {0} elements in cache pool.", cacheManager.Count));            cacheManager.Remove("B");            cacheManager.Remove("C");            Console.WriteLine(string.Format("currently there are {0} elements in cache pool.", cacheManager.Count));            cacheManager.Flush();

 

配置信息

 

 

Isolated Storage Cache Store

            simeple demo            ICacheManager cacheManager = EnterpriseLibraryContainer.Current.GetInstance<ICacheManager>();            cacheManager.Add("A", "This is letter A");            cacheManager.Add("B", "This is letter B");            Console.WriteLine(string.Format("{0}:{1}", "A", cacheManager.GetData("A")));            cacheManager.Remove("A");            Console.WriteLine(string.Format("currently there are {0} elements in cache pool.", cacheManager.Count));            cacheManager.Flush();            Console.WriteLine(string.Format("currently there are {0} elements in cache pool.", cacheManager.Count));

 

配置信息

 

Data Cache Storage

ICacheManager cacheManager = EnterpriseLibraryContainer.Current.GetInstance<ICacheManager>();            cacheManager.Add("A", "This is letter A.");            cacheManager.Add("A", "This is letter A.");            cacheManager.Add("B", "This is letter B.");            cacheManager.Add("C", "This is letter C.");            cacheManager.Add("D", "This is letter D.");            cacheManager.Add("E", "This is letter E.");            Console.WriteLine(string.Format("currently there are {0} elements in cache pool.", cacheManager.Count));            cacheManager.Remove("B");            cacheManager.Remove("C");            Console.WriteLine(string.Format("currently there are {0} elements in cache pool.", cacheManager.Count));            cacheManager.Flush();

 

配置信息

 

 

Custom Cache Storage

ICacheManager cacheManager = EnterpriseLibraryContainer.Current.GetInstance<ICacheManager>();            cacheManager.Add("A", "This is letter A.");            cacheManager.Add("A", "This is letter A.");            cacheManager.Add("B", "This is letter B.");            cacheManager.Add("C", "This is letter C.");            cacheManager.Add("D", "This is letter D.");            cacheManager.Add("E", "This is letter E.");            Console.WriteLine(string.Format("currently there are {0} elements in cache pool.", cacheManager.Count));            cacheManager.Remove("B");            cacheManager.Remove("C");            Console.WriteLine(string.Format("currently there are {0} elements in cache pool.", cacheManager.Count));            cacheManager.Flush();

Custom Cache Storage实现代码

namespace SimpleCacheDemo{    using System;    using System.Linq;    using System.Text;    using System.Configuration;    using System.Data;    using System.IO;    using Microsoft.Win32;    using System.Collections.Generic;    using System.Collections.Specialized;    using System.Collections.Generic;    using System.Collections;    using Microsoft.Practices.EnterpriseLibrary.Common;    using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;    using Microsoft.Practices.ServiceLocation;    using Microsoft.Practices.Unity.Configuration;    using Microsoft.Practices.EnterpriseLibrary.Caching;    using Microsoft.Practices.EnterpriseLibrary.Caching.Expirations;    using Microsoft.Practices.EnterpriseLibrary.Caching.Configuration;    /// <summary>    /// TODO: Update summary.    /// </summary>    ///     [ConfigurationElementType(typeof(CustomCacheStorageData))]    public class CustomStorage:IBackingStore    {        public CustomStorage(NameValueCollection keys)        { }        public void Add(CacheItem newCacheItem)        {            RegistryKey hklm = Registry.LocalMachine;            RegistryKey software = hklm.OpenSubKey("software", true);            RegistryKey microsoft = software.OpenSubKey("microsoft", true);            RegistryKey entryDir = microsoft.CreateSubKey("customcache", RegistryKeyPermissionCheck.ReadWriteSubTree);            if (entryDir != null)            {                if (entryDir.GetValue(newCacheItem.Key) == null)                {                    entryDir.SetValue(newCacheItem.Key, newCacheItem.Value.ToString(), RegistryValueKind.String);                }                entryDir.Close();            }            microsoft.Close();            software.Close();        }        public int Count        {            get {                int keyCount = 0;                RegistryKey hklm = Registry.LocalMachine;                RegistryKey software = hklm.OpenSubKey("software", true);                RegistryKey microsoft = software.OpenSubKey("microsoft", true);                using (RegistryKey entryDir = microsoft.CreateSubKey("customcache", RegistryKeyPermissionCheck.ReadWriteSubTree))                {                    if (entryDir != null)                    {                        keyCount = entryDir.GetValueNames().Length;                    }                }                return keyCount;            }        }        public void Flush()        {            RegistryKey hklm = Registry.LocalMachine;            RegistryKey software = hklm.OpenSubKey("software", true);            RegistryKey microsoft = software.OpenSubKey("microsoft", true);            microsoft.DeleteSubKeyTree("customcache");        }        public System.Collections.Hashtable Load()        {            Hashtable cacheItemTbl = new Hashtable();            RegistryKey hklm = Registry.LocalMachine;            RegistryKey software = hklm.OpenSubKey("software", true);            RegistryKey microsoft = software.OpenSubKey("microsoft", true);            using (RegistryKey entryDir = microsoft.CreateSubKey("customcache", RegistryKeyPermissionCheck.ReadWriteSubTree))            {                if (entryDir != null)                {                    foreach (string key in entryDir.GetValueNames())                    {                        cacheItemTbl.Add(key, entryDir.GetValue("key"));                    }                }            }            return cacheItemTbl;        }        public void Remove(string key)        {            RegistryKey hklm = Registry.LocalMachine;            RegistryKey software = hklm.OpenSubKey("software", true);            RegistryKey microsoft = software.OpenSubKey("microsoft", true);            using (RegistryKey entryDir = microsoft.CreateSubKey("customcache", RegistryKeyPermissionCheck.ReadWriteSubTree))            {                if (entryDir != null)                {                    entryDir.DeleteValue(key);                }            }        }        public void UpdateLastAccessedTime(string key, DateTime timestamp)        {                   }        public void Dispose()        {                    }    }}

配置信息

 

缓存禁用

////cache expire regulation            string moniterFilePath = AppDomain.CurrentDomain.BaseDirectory + "tmp.txt";            ICacheManager cacheManager = EnterpriseLibraryContainer.Current.GetInstance<ICacheManager>();            if (File.Exists(moniterFilePath) == false)            {                using (File.Create(moniterFilePath))                { }            }            // these class was implemented interface ICacheItemExpiration            NeverExpired neverExpired = new NeverExpired();            AbsoluteTime absoluteTime = new AbsoluteTime(new TimeSpan(0, 0, 10));//ten seconds            SlidingTime slidingTime = new SlidingTime(new TimeSpan(0, 0, 10));            FileDependency fileDependency = new FileDependency(moniterFilePath);            //没实现，构造函数中的参数比较奇怪            ExtendedFormatTime extendedFormatTIme = new ExtendedFormatTime("Hour - 0-23");            //cache refresh listener            CacheRefreshContainer cacheRefreshContainer = new CacheRefreshContainer(cacheManager, slidingTime);            CacheRefresher cacheRefresher = new CacheRefresher(cacheRefreshContainer);//new CacheRefresher();//new CacheRefresher(cacheManager);            //seems we can't add a new item in cache pool during CacheRefresher was executing.            cacheManager.Add("A", "This is letter A!", CacheItemPriority.High, cacheRefresher, slidingTime);            Console.WriteLine(string.Format("{0}:{1}", "A", cacheManager.GetData("A")));            System.Threading.Thread.Sleep(15000);            Console.WriteLine(string.Format("{0}:{1}", "AB", cacheManager.GetData("AB")));            //test encryptograme function            cacheManager.Add("A", "This is letter A.");            Console.WriteLine(string.Format("{0}:{1}", "A", cacheManager.GetData("A")));            Console.ReadKey();            cacheManager.Flush();

CacehRefresher

    [Serializable]    public class CacheRefresher:ICacheItemRefreshAction    {        //ICacheManager _cacheManager;        //public CacheRefresher(ICacheManager cacheManager)        //{        //    _cacheManager = cacheManager;        //}        CacheRefreshContainer _cacheRefreshContainer;        public CacheRefresher(CacheRefreshContainer cacheRefreshContainer)        {            _cacheRefreshContainer = cacheRefreshContainer;        }        public void Refresh(string removedKey, object expiredValue, CacheItemRemovedReason removalReason)        {            //_cacheManager.Remove(removedKey);            //_cacheManager.Add(removedKey + "B", expiredValue.ToString() + " new!");        }    }