在多个应用程序之间共享企业库数据库缓存 [英] Sharing Enterprise Library Database Cache between Multiple Applications

问题描述

我在Enterprise Library 5缓存块中遇到了一个奇怪的问题，其中两个应用程序共享同一个数据库缓存。我编写了一个非常简单的静态缓存管理器类，该类结束了EntLib5 ICacheManager的创建，并对其进行读取/写入。

I'm having a strange problem with the Enterprise Library 5 Caching Block where two applications are sharing the same database cache. I've written a very simple static cache manager class which wraps up creating the EntLib5 ICacheManager, and reading/writing to it.

private static ICacheManager _manager = null;

private static ICacheManager Manager
{
    get
    {
        lock (ClientLock)
        {
            if (_manager == null)
                _manager = CacheFactory.GetCacheManager();

            return _manager;
        }
    }
}

public static object Get(string cacheKey)
{
    return Manager.GetData(cacheKey);
}

public static void Add(string cacheKey, object cacheItem)
{
    Manager.Add(cacheKey, cacheItem);
}

我的数据库已正确设置，配置文件也已正确设置，我可以阅读&从单个控制台应用程序写入数据库缓存没有问题。

My database is setup correctly as are the configuration files and I can read & write to the database cache from a single console application with no problems.

但是我试图在共享相同缓存的两个应用程序之间进行测试。问题似乎是，如果Console_A中的Static CachingManager类将项目添加到缓存中，则在Console_B实例化其为静态CacheManager之后，Console_B不会获取更改。

However I'm trying to do a test between two applications sharing the same cache. The problem seems to be that if the Static CachingManager class in Console_A adds items to the Cache, after Console_B has instantiated it's static CacheManager, the changes are not picked up by Console_B.

Here's a quick timeline to explain.

Start Console_A

Write Item1 from Console_A to Cache - (Static ICacheManager created with noticeable 1sec pause) Success - 1 Item in Cache
Write Item2 from Console_A to Cache - Success - 2 Items in Cache
Write Item3 from Console_A to Cache - Success - 3 Items in Cache

Start Console_B

Read Item1 from Cache to Console_B - (Static ICacheManager created with noticeable 1sec pause) - Success - 3 Items in Cache
Read Item2 from Cache to Console_B - Success - 3 Items in Cache
Read Item3 from Cache to Console_B - Success - 3 Items in Cache

Write Item4 from Console_A to Cache - Success - 4 Items in Cache (Confirmed in DB)
Read Item4 from Cache to Console_B - Failure - 3 Items in Cache

因此，似乎Console_B最初设置它是缓存管理器后，它不会返回数据库刷新数据。包含

So it seems that once Console_B initially sets up it's cache manager, it doesn't go back to the database to refresh the data. the Contains

我也尝试从我的媒体资源中删除<​​code> if（_manager == null）支票，因此

I've tried removing the if(_manager == null) check from my Property as well so that it pulls a new CacheManager from the factory everytime but it made no difference.

任何建议都值得赞赏。

任何建议都应得到赞赏。

EDIT

编辑

似乎 LoadItems 仅在实例化ICacheManager时调用Sproc，而无论您是否再次调用CacheFActory / Unity EntLibContainer，都不会在应用程序生命周期中再次调用Sproc。

解决方案

推荐答案

Console_A和Console_B的应用程序域不同。即使您已将缓存管理器定义为静态的，它也不存在于应用程序域之外，因此实际上您有两个彼此不认识的单独的缓存管理器。

I'd recommend using a service (WCF) and calling your business methods through that service, that way all console applications will be calling the same service and it will have one instance of a cache manager residing in it's own application domain.

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