我正在尝试实现通用缓存管理器,但我不确定如何进行锁定。
到目前为止我有以下内容,但是如果我有两个具有相同返回类型的缓存条目,那么我猜会使用相同的锁对象!
public class CacheManager : ICacheManager
{
static class TypeLock<T>
{
public static readonly object SyncLock = new object();
}
private readonly ICache _cache;
public CacheManager(ICache cache)
{
if (cache == null)
throw new ArgumentNullException("cache");
_cache = cache;
}
public TResult AddCache<TResult>(string cacheKey, Func<TResult> acquire, int cacheDurationInMinutes) where TResult : class
{
return AddCache(cacheKey, null, acquire, cacheDurationInMinutes);
}
public TResult AddCache<TResult>(string cacheKey, CacheDependency dependency, Func<TResult> acquire, int cacheDurationInMinutes) where TResult : class
{
var entry = acquire.Invoke();
if (entry != null)
{
if (dependency != null)
_cache.InsertWithDependency(cacheKey, entry, dependency, DateTime.Now.AddMinutes(cacheDurationInMinutes));
else
_cache.Insert(cacheKey, entry, DateTime.Now.AddMinutes(cacheDurationInMinutes));
}
return entry;
}
public TResult GetOrAddCache<TResult>(string cacheKey, Func<TResult> acquire, int cacheDurationInMinutes) where TResult : class
{
return GetOrAddCache(cacheKey, null, acquire, cacheDurationInMinutes);
}
public TResult GetOrAddCache<TResult>(string cacheKey, CacheDependency dependency, Func<TResult> acquire, int cacheDurationInMinutes) where TResult : class
{
var entry = _cache.GetItem(cacheKey) as TResult;
if (entry == null)
{
lock (TypeLock<TResult>.SyncLock)
{
entry = _cache.GetItem(cacheKey) as TResult;
if (entry == null)
{
entry = acquire.Invoke();
if (entry != null)
{
if (dependency != null)
_cache.InsertWithDependency(cacheKey, entry, dependency,
DateTime.Now.AddMinutes(cacheDurationInMinutes));
else
_cache.Insert(cacheKey, entry, DateTime.Now.AddMinutes(cacheDurationInMinutes));
}
}
}
}
return entry;
}
}
如有任何帮助,我们将不胜感激!
最佳答案
你是对的,这将对所有相同类型的缓存条目使用相同的锁。为了使您的实际缓存方法(内存、文件、数据库...)独立于此缓存管理器,我建议为每个缓存条目存储一个额外的同步对象,这样您的缓存条目将看起来像 Tuple<object, TResult>
。而不仅仅是 TResult
, 其中object
将是 new object()
对于每个条目,将用于锁定。
关于c# - 如何在 C# 中实现通用缓存管理器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13520364/