using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Text.RegularExpressions;
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using CoreCms.Net.Caching.Manual;
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using Microsoft.Extensions.Caching.Memory;
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using Microsoft.Extensions.Options;
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namespace CoreCms.Net.Caching.MemoryCache
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{
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public class MemoryCacheManager : IManualCacheManager
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{
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private static volatile Microsoft.Extensions.Caching.Memory.MemoryCache _memoryCache = new Microsoft.Extensions.Caching.Memory.MemoryCache((IOptions<MemoryCacheOptions>)new MemoryCacheOptions());
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/// <summary>
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/// 验证缓存项是否存在
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/// </summary>
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/// <param name="key">缓存Key</param>
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/// <returns></returns>
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public bool Exists(string key)
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{
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if (key == null)
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throw new ArgumentNullException(nameof(key));
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return _memoryCache.TryGetValue(key, out _);
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}
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/// <summary>
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/// 添加缓存
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/// </summary>
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/// <param name="key">缓存Key</param>
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/// <param name="value">缓存Value</param>
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/// <param name="expiresIn">缓存时间</param>
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/// <returns></returns>
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public bool Set(string key, object value, int expiresIn = 0)
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{
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if (key == null)
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throw new ArgumentNullException(nameof(key));
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if (value == null)
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throw new ArgumentNullException(nameof(value));
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if (expiresIn > 0)
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{
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_memoryCache.Set(key, value,
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new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromSeconds(120))
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.SetAbsoluteExpiration(TimeSpan.FromMinutes(expiresIn)));
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}
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else
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{
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_memoryCache.Set(key, value,
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new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromSeconds(120))
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.SetAbsoluteExpiration(TimeSpan.FromMinutes(1440)));
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}
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return Exists(key);
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}
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/// <summary>
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/// 删除缓存
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/// </summary>
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/// <param name="key">缓存Key</param>
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/// <returns></returns>
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public void Remove(string key)
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{
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if (key == null)
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throw new ArgumentNullException(nameof(key));
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_memoryCache.Remove(key);
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}
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/// <summary>
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/// 批量删除缓存
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/// </summary>
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/// <returns></returns>
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public void RemoveAll(IEnumerable<string> keys)
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{
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if (keys == null)
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throw new ArgumentNullException(nameof(keys));
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keys.ToList().ForEach(item => _memoryCache.Remove(item));
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}
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/// <summary>
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/// 获取缓存对象
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/// </summary>
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/// <param name="key">缓存Key</param>
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/// <returns></returns>
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public T Get<T>(string key)
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{
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if (key == null)
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throw new ArgumentNullException(nameof(key));
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return _memoryCache.Get<T>(key);
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}
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/// <summary>
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/// 获取缓存
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/// </summary>
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/// <param name="key">缓存Key</param>
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/// <returns></returns>
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public object Get(string key)
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{
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if (key == null)
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throw new ArgumentNullException(nameof(key));
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return _memoryCache.Get(key);
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}
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/// <summary>
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/// 获取缓存集合
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/// </summary>
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/// <param name="keys">缓存Key集合</param>
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/// <returns></returns>
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public IDictionary<string, object> GetAll(IEnumerable<string> keys)
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{
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if (keys == null)
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throw new ArgumentNullException(nameof(keys));
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var dict = new Dictionary<string, object>();
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keys.ToList().ForEach(item => dict.Add(item, _memoryCache.Get(item)));
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return dict;
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}
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/// <summary>
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/// 删除所有缓存
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/// </summary>
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public void RemoveCacheAll()
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{
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var l = GetCacheKeys();
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foreach (var s in l)
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{
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Remove(s);
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}
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}
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/// <summary>
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/// 删除匹配到的缓存
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/// </summary>
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/// <param name="pattern"></param>
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/// <returns></returns>
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public void RemoveCacheRegex(string pattern)
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{
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IList<string> l = SearchCacheRegex(pattern);
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foreach (var s in l)
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{
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Remove(s);
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}
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}
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/// <summary>
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/// 搜索 匹配到的缓存
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/// </summary>
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/// <param name="pattern"></param>
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/// <returns></returns>
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public IList<string> SearchCacheRegex(string pattern)
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{
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var cacheKeys = GetCacheKeys();
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var l = cacheKeys.Where(k => Regex.IsMatch(k, pattern)).ToList();
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return l.AsReadOnly();
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}
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/// <summary>
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/// 获取所有缓存键
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/// </summary>
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/// <returns></returns>
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public List<string> GetCacheKeys()
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{
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const BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
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var entries = _memoryCache.GetType().GetField("_entries", flags).GetValue(_memoryCache);
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var cacheItems = entries as IDictionary;
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var keys = new List<string>();
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if (cacheItems == null) return keys;
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foreach (DictionaryEntry cacheItem in cacheItems)
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{
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keys.Add(cacheItem.Key.ToString());
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}
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return keys;
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}
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}
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}
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