CODEWITHSUNDEEP
asp.netmultithreadinglockingblocking
sh1ng
sh1ng

Reputation: 2973

How to organize ASP.NET request locking or row locking in DB

I've asp.net page/handler to access images. When performed fist request to the image I resize image to standard size(save on disk) and return it. So I need lock all request to the image except one. This one will resize image. Image identified by ID in URL, so I guess one lock object required per one image(ID in URL). My question is How can I organize this lock model?

My idea add lock object in Application (Application is synchronized) like this Application.Add(Request[Id], new object()); and use it to locking competitive threads.

This task like row locking of DB or locking element in collection.

Thanks for your replay.

Upvotes: 2

Views: 308

Answers (1)

sh1ng
sh1ng

Reputation: 2973

The easiest way is locking image file with.


using (FileStream fs = new FileStream("image.file", FileMode.Create, FileAccess.Write, FileShare.None))
{

resize image here 

}

When second(third etc) thread try to create file the Exception "The process cannot access the file ..." will throw. And I process this exception in code.

Upvotes: 1

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