Comments on: Some Notes on HttpContext.Cache http://www.dioramadesign.net/blog/some-notes-on-httpcontextcache/ Notes on web application design using .NET and XHTML Fri, 30 Jul 2010 07:03:52 +0000 http://wordpress.org/?v=2.3.2 By: optimizing XSL in .NET 2.0 at Dylan Marks on Web Application Development http://www.dioramadesign.net/blog/some-notes-on-httpcontextcache/#comment-1392 optimizing XSL in .NET 2.0 at Dylan Marks on Web Application Development Wed, 09 May 2007 19:08:30 +0000 http://www.dioramadesign.net/blog/some-notes-on-httpcontextcache/#comment-1392 [...] You may find my notes on httpcontext.cache helpful. Tags: .net, caching, optimization, profiling, tools. var blogTool = "WordPress"; var blogURL = "http://www.dioramadesign.net/blog"; var blogTitle = "Dylan Marks on Web Application Development"; var postURL = "http://www.dioramadesign.net/blog/optimizing-xsl-in-net-20/"; var postTitle = "optimizing XSL in .NET 2.0"; var commentAuthorFieldName = "author"; var commentAuthorLoggedIn = false; var commentFormID = "commentform"; var commentTextFieldName = "comment"; var commentButtonName = "submit"; [...] […] You may find my notes on httpcontext.cache helpful. Tags: .net, caching, optimization, profiling, tools. var blogTool = “WordPress”; var blogURL = “http://www.dioramadesign.net/blog”; var blogTitle = “Dylan Marks on Web Application Development”; var postURL = “http://www.dioramadesign.net/blog/optimizing-xsl-in-net-20/”; var postTitle = “optimizing XSL in .NET 2.0″; var commentAuthorFieldName = “author”; var commentAuthorLoggedIn = false; var commentFormID = “commentform”; var commentTextFieldName = “comment”; var commentButtonName = “submit”; […]

]]> By: dmarks http://www.dioramadesign.net/blog/some-notes-on-httpcontextcache/#comment-641 dmarks Wed, 18 Apr 2007 17:38:06 +0000 http://www.dioramadesign.net/blog/some-notes-on-httpcontextcache/#comment-641 Well, when you retrieve into an object, you aren't going back a second time to the cache to actually work with the cached item. This avoids a race condition in that rare time that the value of the cache changes in the microsecond between checking if it is null and actually using it. This pattern is also explained here: http://scottcate.mykb.com/Article_5CB26.aspx I actually second guessed myself about this after your comment, thinking that maybe retrieving into an object would be only a reference. But no, when you retrieve the cached item into an object, if the cache changes after that, it won't affect the value of the object. So you know for sure that if you check that the object is not null, then it isn't going to change on you a second later. Well, when you retrieve into an object, you aren’t going back a second time to the cache to actually work with the cached item. This avoids a race condition in that rare time that the value of the cache changes in the microsecond between checking if it is null and actually using it.

This pattern is also explained here:
http://scottcate.mykb.com/Article_5CB26.aspx

I actually second guessed myself about this after your comment, thinking that maybe retrieving into an object would be only a reference. But no, when you retrieve the cached item into an object, if the cache changes after that, it won’t affect the value of the object. So you know for sure that if you check that the object is not null, then it isn’t going to change on you a second later.

]]> By: Hrusikesh http://www.dioramadesign.net/blog/some-notes-on-httpcontextcache/#comment-640 Hrusikesh Wed, 18 Apr 2007 17:22:43 +0000 http://www.dioramadesign.net/blog/some-notes-on-httpcontextcache/#comment-640 How does retrieving into an object avoid the issue? How does retrieving into an object avoid the issue?

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