在iis网站中缓存全局数据

时间:2011-04-06 08:42:32

标签: c# multithreading iis caching

我有一个缓存一分钟的READONLY对象图,以便所有线程都可以使用它(下面的代码)。

public class ObjectGraphCache
{
    static readonly Object storeLock = new object();

    public ObjectGraph AllForElection(int ElectionId, System.Web.Caching.Cache cache)
    {
        string key=string.Format("AllForElection{0}",
            ElectionId);
        int timout = int.Parse(ConfigurationManager.AppSettings["dbCacheTimeInSeconds"]);

        if (timout == 0)
        {
            ObjectGraph graph = new ObjectGraph();
            graph.AllForElection(ElectionId);
            return graph;
        }
        else
        {
            Object obj = cache[key];
            if (obj == null)
            {
                lock (storeLock)
                {
                    obj = cache[key]; // In case another page got the lock first and your are queued (Ensures only one get per cycle)
                    if (obj == null)
                    {
                        // Not in cache
                        ObjectGraph graph = new ObjectGraph();
                        graph.AllForElection(ElectionId);

                        cache.Insert(
                            key,
                            graph,
                            null,
                            DateTime.Now.Add(new TimeSpan(0, 0, timout)),
                            System.Web.Caching.Cache.NoSlidingExpiration);
                        return graph;
                    }
                }
            }
            return (ObjectGraph)obj;
        }

但是我想知道:为什么使用Cache对象,当我更容易将READONLY对象存储为静态时。这会存储一个指向堆的指针,因此在更新时,仍然处理前一个指针对象的线程将对旧对象进行一次罚款,并且在返回之前我也不必从缓存中转换对象。有人看到任何陷阱吗?

1 个答案:

答案 0 :(得分:1)

storeLock放入应用程序变量