当前位置：首页 > ds >正文

Microsoft Enterprise Library: Cache 模块

ds 2025/8/16 18:43:02

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!");
}
}

查看全文

http://www.xdnf.cn/news/11158.html