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by Duncan Mackenzie.
Original Post: Feeling the Cache Love
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Feed Description: Duncan is the Visual Basic Content Strategist at MSDN, the editor of the Visual Basic Developer Center (http://msdn.microsoft.com/vbasic), and the author of the "Coding 4 Fun" column on MSDN (http://msdn.microsoft.com/vbasic/using/columns/code4fun/default.aspx). While typically Visual Basic focused, his blogs sometimes wanders off of the technical path and into various musing of his troubled mind.
I've been working on the business and data layers for a web system and, as you might expect, I've been making quite a bit of use of ASP.NET's caching system. Now, to test the business layer, I had gone ahead and set up a non-ASP.NET caching system as well using my standard method for caching in Windows applications, a static hashtable with strongly typed string keys (works well, fairly compatible with the ASP.NET cache so it is easy to move code between the two models) but then I realized that I could just use the ASP.NET cache even when my code was being used from a Windows Forms applications (for my class libraries, where I don't know what type of interface is being used) and it works just fine.
Shared Function GetValueFromCache( _ ByVal key As String) As Object Dim myContext As HttpContext myContext = HttpContext.Current
If myContext Is Nothing Then Return HttpRuntime.Cache.Get(key) Else Return myContext.Cache.Get(key) End If End Function
Shared Sub PlaceValueIntoCache( _ ByVal key As String, _ ByVal item As Object, _ ByVal cacheDuration As Integer) Dim myContext As HttpContext myContext = HttpContext.Current Dim myCache As Caching.Cache
If myContext Is Nothing Then myCache = HttpRuntime.Cache Else myCache = myContext.Cache End If
myCache.Insert(key, item, Nothing, _ Now.AddSeconds(cacheDuration), _ Caching.Cache.NoSlidingExpiration) End Sub
This might be common knowledge, but I have been handling my own non-ASP.NET caching all on my own, and this just makes it too easy. In fact, it makes it so easy that I started thinking of ways to perform even more caching in some of my Windows Forms applications... I can see many performance gains in my future!
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