1、缓存接口
using System; using System.Collections.Generic; using System.Runtime.Caching; using System.Text.RegularExpressions; namespace EnterpriseFrame.Core.Caching { /// <summary> /// Represents a manager for caching between HTTP requests (long term caching) /// </summary> public partial class MemoryCacheManager : ICacheManager { protected ObjectCache Cache { get { return MemoryCache.Default; } } /// <summary> /// Gets or sets the value associated with the specified key. /// </summary> /// <typeparam name="T">Type</typeparam> /// <param name="key">The key of the value to get.</param> /// <returns>The value associated with the specified key.</returns> public virtual T Get<T>(string key) { return (T)Cache[key]; } /// <summary> /// Adds the specified key and object to the cache. /// </summary> /// <param name="key">key</param> /// <param name="data">Data</param> /// <param name="cacheTime">Cache time</param> public virtual void Set(string key, object data, int cacheTime) { if (data == null) return; var policy = new CacheItemPolicy(); policy.AbsoluteExpiration = DateTime.Now + TimeSpan.FromMinutes(cacheTime); Cache.Add(new CacheItem(key, data), policy); } /// <summary> /// Gets a value indicating whether the value associated with the specified key is cached /// </summary> /// <param name="key">key</param> /// <returns>Result</returns> public virtual bool IsSet(string key) { return (Cache.Contains(key)); } /// <summary> /// Removes the value with the specified key from the cache /// </summary> /// <param name="key">/key</param> public virtual void Remove(string key) { Cache.Remove(key); } /// <summary> /// Removes items by pattern /// </summary> /// <param name="pattern">pattern</param> public virtual void RemoveByPattern(string pattern) { var regex = new Regex(pattern, RegexOptions.Singleline | RegexOptions.Compiled | RegexOptions.IgnoreCase); var keysToRemove = new List<String>(); foreach (var item in Cache) if (regex.IsMatch(item.Key)) keysToRemove.Add(item.Key); foreach (string key in keysToRemove) { Remove(key); } } /// <summary> /// Clear all cache data /// </summary> public virtual void Clear() { foreach (var item in Cache) Remove(item.Key); } } }
2、扩展
using System; namespace EnterpriseFrame.Core.Caching { /// <summary> /// Extensions /// </summary> public static class CacheExtensions { /// <summary> /// 获取缓存，不存在则将acquire的结果存入缓存，默认时间60分钟 /// </summary> /// <typeparam name="T">Type</typeparam> /// <param name="cacheManager">Cache manager</param> /// <param name="key">Cache key</param> /// <param name="acquire">Function to load item if it's not in the cache yet</param> /// <returns>Cached item</returns> public static T Get<T>(this ICacheManager cacheManager, string key, Func<T> acquire) { return Get(cacheManager, key, 60, acquire); } /// <summary> /// 获取缓存,如果不存在缓存中，执行结果然后将其加载和缓存 /// </summary> /// <typeparam name="T">缓存类型</typeparam> /// <param name="cacheManager">Cache manager</param> /// <param name="key">Cache key</param> /// <param name="cacheTime">缓存时间 在0分钟-不要缓存</param> /// <param name="acquire">没有缓存则执行此表达式设置缓存</param> /// <returns>Cached item</returns> public static T Get<T>(this ICacheManager cacheManager, string key, int cacheTime, Func<T> acquire) { if (cacheManager.IsSet(key)) { return cacheManager.Get<T>(key); } else { var result = acquire(); if (cacheTime > 0) cacheManager.Set(key, result, cacheTime); return result; } } } }
3、MemoryCacheManager实现
using System; using System.Collections.Generic; using System.Runtime.Caching; using System.Text.RegularExpressions; namespace EnterpriseFrame.Core.Caching { /// <summary> /// Represents a manager for caching between HTTP requests (long term caching) /// </summary> public partial class MemoryCacheManager : ICacheManager { protected ObjectCache Cache { get { return MemoryCache.Default; } } /// <summary> /// Gets or sets the value associated with the specified key. /// </summary> /// <typeparam name="T">Type</typeparam> /// <param name="key">The key of the value to get.</param> /// <returns>The value associated with the specified key.</returns> public virtual T Get<T>(string key) { return (T)Cache[key]; } /// <summary> /// Adds the specified key and object to the cache. /// </summary> /// <param name="key">key</param> /// <param name="data">Data</param> /// <param name="cacheTime">Cache time</param> public virtual void Set(string key, object data, int cacheTime) { if (data == null) return; var policy = new CacheItemPolicy(); policy.AbsoluteExpiration = DateTime.Now + TimeSpan.FromMinutes(cacheTime); Cache.Add(new CacheItem(key, data), policy); } /// <summary> /// Gets a value indicating whether the value associated with the specified key is cached /// </summary> /// <param name="key">key</param> /// <returns>Result</returns> public virtual bool IsSet(string key) { return (Cache.Contains(key)); } /// <summary> /// Removes the value with the specified key from the cache /// </summary> /// <param name="key">/key</param> public virtual void Remove(string key) { Cache.Remove(key); } /// <summary> /// Removes items by pattern /// </summary> /// <param name="pattern">pattern</param> public virtual void RemoveByPattern(string pattern) { var regex = new Regex(pattern, RegexOptions.Singleline | RegexOptions.Compiled | RegexOptions.IgnoreCase); var keysToRemove = new List<String>(); foreach (var item in Cache) if (regex.IsMatch(item.Key)) keysToRemove.Add(item.Key); foreach (string key in keysToRemove) { Remove(key); } } /// <summary> /// Clear all cache data /// </summary> public virtual void Clear() { foreach (var item in Cache) Remove(item.Key); } } }