// autoLock 防止Cache失效的时候，大量请求Cache对象，重复调用Load使得服务器彻底失效
public static T GetOrDefault <T>(string key, Func <T> loadFunc, int lifeTimeSeconds = CahceTimeDefault, bool autoLock = true) where T : class
{
T obj = cacheProvider.GetCachedObject(key) as T;
if (null == obj)
{
if (autoLock)
{
using (var l = cacheProvider.AcquireLock(key)) {
// re read，多线程环境下，如果第一次读取失败
// 每个线程都会call load Func，所以会引起内存失效崩溃
// 现在的代码只会有一个线程call对应的loadFunc
obj = cacheProvider.GetCachedObject(key) as T;
if (null != obj)
{
return(obj);
}
obj = loadFunc();
cacheProvider.SetCachedObject(key, obj, lifeTimeSeconds);
}
}
else
{
obj = loadFunc();
cacheProvider.SetCachedObject(key, obj, lifeTimeSeconds);
}
}
return(obj);
}
