如何清除 WebRole 启动时的整个 Windows Azure Appfabric 缓存？

发布于 2024-12-15 05:02:27 字数 2632 浏览 2 评论 0原文

我正在尝试做一件可能很简单的事情，但我就是找不到答案。我知道如何删除应用程序级别的缓存（对于网站）。

但我需要在 webrole 启动时清除我的 azure appfabric 缓存的所有缓存。

编辑：如果可以做到怎么办？到 Azure Asp.net 共享缓存中的严重故障还是我很

愚蠢

考虑
？每个根都有 60 分钟的缓存，这是普通的常规 <%@ OutputCache Duration="3600" VaryByParam="*" %>，没有花哨的代码
我浏览它们，因此有几个缓存页面存储在 appfabric 缓存中 60 分钟
考虑此部署中的底层缓存依赖项是在“E:\sitesroot\xx”之类的路径上创建的
在这之间，我的 Webrole 重置或上传新部署
现在考虑在新创建的网站中实例具有以下路径：'F:\sitesroot\xx'
你明白了，这是我的结果：

目录'E:\sitesroot\12'不存在。无法开始监视文件更改。

System.Web.HttpException (0x80070003): Directory 'E:\sitesroot\12' does not exist. Failed to start monitoring file changes.
at System.Web.FileChangesMonitor.FindDirectoryMonitor(String dir, Boolean addIfNotFound, Boolean throwOnError)
at System.Web.FileChangesMonitor.StartMonitoringPath(String alias, FileChangeEventHandler callback, FileAttributesData& fad)
at System.Web.Caching.CacheDependency.Init(Boolean isPublic, String[] filenamesArg, String[] cachekeysArg, CacheDependency dependency, DateTime utcStart)
at System.Web.Caching.CacheDependency..ctor(Int32 dummy, String[] filenames)
at System.Web.Caching.OutputCache.HasDependencyChanged(Boolean isFragment, String depKey, String[] fileDeps, String kernelKey, String oceKey, String providerName)
 at System.Web.Caching.OutputCache.Get(String key)
 at System.Web.Caching.OutputCacheModule.OnEnter(Object source, EventArgs eventArgs)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
 at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

我花了一些时间才明白这个问题可能是因为当前的 appfacbric 缓存依赖于具有硬路径“E:\sitesroot\”的缓存依赖项。如果这条路径改变了怎么办？

那我能做什么呢？我在这里迷路了，我尝试清除 Global.asax Application_Start 上的应用程序缓存，但这似乎不起作用（而且我不明白为什么它不起作用）。

这是我的代码，用于清除每个网站上的缓存 Global.asax Application_Start

Public Shared Sub cacheClear()

    Dim keys As New List(Of String)()
    ' retrieve application Cache enumerator
    Dim enumerator As IDictionaryEnumerator = HttpRuntime.Cache.GetEnumerator()
    ' copy all keys that currently exist in Cache
    While enumerator.MoveNext()
        keys.Add(enumerator.Key.ToString())
    End While
    ' delete every key from cache
    For i As Integer = 0 To keys.Count - 1
        HttpRuntime.Cache.Remove(keys(i))
    Next

End Sub

这应该可以解决问题，但似乎没有。

我肯定错过了一个可笑的点。

编辑

我结束了完全放弃appfabric的asp.net输出缓存提供程序并使用appfabric编写自定义缓存。效果很好，几行代码和对 azure 的缓存依赖变得很容易。

原文

I'm trying to do what might be a simple thing, but i just can't find the answer.
I know how to delete cache on the application level (for a website).

But i need to CLEAR ALL THE CACHE of my azure appfabric cache on webrole start.

EDIT : What if it can be done ? Considering a severe misfunction in Azure Asp.net shared caching or am I dumb ?

This this the scenario i'm stuck into :

I have a a WebRole which have few different websites
Consider all my websites have a default.aspx file on each root with a 60 minutes caching, this is plain regular <%@ OutputCache Duration="3600" VaryByParam="*" %>, no fancy code
I browse them, consequently several cached pages are stored in appfabric caches for 60 minutes
Consider uner the hood in this deployment cache depencies are created upon a path like 'E:\sitesroot\xx'
In between, my Webrole reset or I upload a new deployment
Now consider my websites in newly created instances have this path : 'F:\sitesroot\xx'
You get it, heres the result I have :

Directory 'E:\sitesroot\12' does not exist. Failed to start monitoring file changes.

System.Web.HttpException (0x80070003): Directory 'E:\sitesroot\12' does not exist. Failed to start monitoring file changes.
at System.Web.FileChangesMonitor.FindDirectoryMonitor(String dir, Boolean addIfNotFound, Boolean throwOnError)
at System.Web.FileChangesMonitor.StartMonitoringPath(String alias, FileChangeEventHandler callback, FileAttributesData& fad)
at System.Web.Caching.CacheDependency.Init(Boolean isPublic, String[] filenamesArg, String[] cachekeysArg, CacheDependency dependency, DateTime utcStart)
at System.Web.Caching.CacheDependency..ctor(Int32 dummy, String[] filenames)
at System.Web.Caching.OutputCache.HasDependencyChanged(Boolean isFragment, String depKey, String[] fileDeps, String kernelKey, String oceKey, String providerName)
 at System.Web.Caching.OutputCache.Get(String key)
 at System.Web.Caching.OutputCacheModule.OnEnter(Object source, EventArgs eventArgs)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
 at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

It took me some times to understand that this issue MIGHT BE because the current appfacbric cache relied on a cachedepency with a hard path "E:\sitesroot\". What if this path change, has it DOES.

So what can I do ? I'm lost here, I tried to clear appcache on Global.asax Application_Start, but this does not seem to work (and i don't understand why it does not).

Here's my code to clear cache on each websites Global.asax Application_Start

Public Shared Sub cacheClear()

    Dim keys As New List(Of String)()
    ' retrieve application Cache enumerator
    Dim enumerator As IDictionaryEnumerator = HttpRuntime.Cache.GetEnumerator()
    ' copy all keys that currently exist in Cache
    While enumerator.MoveNext()
        keys.Add(enumerator.Key.ToString())
    End While
    ' delete every key from cache
    For i As Integer = 0 To keys.Count - 1
        HttpRuntime.Cache.Remove(keys(i))
    Next

End Sub

This should do the trick, it does not seems to.

There certainly a ridiculous point i'm missing.

EDIT

I ended dropping completely asp.net outputcache provider for appfabric and writing a custom cache with appfabric. Works great, few line of codes and cachedependancy on azure made easy.

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