ury ury - 25 days ago 16
C# Question

ASP.NET MVC shared counter best practices

My ASP.NET MVC 4 project is using EF5 code-first, and some of the domain objects contain non- persisted counter properties which are updated according to incoming requests. These requests come very frequently and s scenario in which multiple request sessions are modifying these counters is quite probable.

My question is, is there a best practice, not necessarily related to ASP.NET or to EF, to handle this scenario? I think (but I'm not sure) that for the sake of this discussion, we can treat the domain objects as simple POCOs (which they are).

EDIT: As requested, following is the actual scenario:

The system is a subscriber and content management system. Peer servers are issuing requests which my system either authorizes or denies. Authorized requests result in opening sessions in peer servers. When a session is closed in the peer server, it issues a request notifying that the session has been closed.

My system needs to provide statistics - for example, the number of currently open sessions for each content item (one of the domain entities) - and provide real-time figures as well as per-minute, hourly, daily, weekly etc. figures.

These figures can't be extracted by means of querying the database due to performance issues, so I've decided to implement the basic counters in-memory, persist them every minute to the database and take the hourly, daily etc. figures from there.

The issue above results from the fact that each peer server request updates these "counters".

I hope it's clearer now.

Answer

Sounds like your scenario still requires a solid persistence strategy.

Your counter objects can be persisted to the HttpRuntime.Cache. Dan Watson has an exceptional writeup here: http://www.dotnetguy.co.uk/post/2010/03/29/c-httpruntime-simple-cache/

Be sure to use CacheItemPriority.NotRemovable to ensure that it maintains state during memory reclamation. The cache would be maintained within the scope of the app domain. You could retrieve and update counters (its thread safe!) in the cache and query its status from presumably a stats page or some other option. However if the data needs to be persisted beyond the scope of runtime then the strategy you're already using is sufficient.

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