/// <summary>
/// 单体模式返回当前类的实例
/// </summary>
/// <returns></returns>
public static SASCache GetCacheService()
{
if (instance == null)
{
lock (lockHelper)
{
if (instance == null)
{
instance = new SASCache();
}
}
}
//检查并移除相应的缓存项
instance = CachesFileMonitor.CheckAndRemoveCache(instance);
return instance;
}
public static SASCache CheckAndRemoveCache(SASCache instance)//
{
//当程序运行中cache.config发生变化时则对缓存对象做删除的操作
cachefilenewchange = System.IO.File.GetLastWriteTime(path);
if (cachefileoldchange != cachefilenewchange)
{
lock (cachelockHelper)
{
if (cachefileoldchange != cachefilenewchange)
{
//当有要清除的项时
DataSet dsSrc = new DataSet();
dsSrc.ReadXml(path);
foreach (DataRow dr in dsSrc.Tables[0].Rows)
{
if (dr["xpath"].ToString().Trim() != "")
{
DateTime removedatetime = DateTime.Now;
try
{
removedatetime = Convert.ToDateTime(dr["removedatetime"].ToString().Trim());
}
catch
{
;
}
if (removedatetime > cachefilenewchange.AddSeconds(-2))
{
string xpath = dr["xpath"].ToString().Trim();
instance.RemoveObject(xpath, false);
}
}
}
cachefileoldchange = cachefilenewchange;
dsSrc.Dispose();
}
}
}
return instance;
}
