Deiphobus, first level caching
This post has been imported from my previous blog. I did my best to parse XML properly, but it might have some errors.
If you find one, send a Pull Request.
Another feature of my mapper for Cassandra database, is the first level cache, commonly known as the identity map. Consider loading an entity of a user type only for displaying its login in the page header. Next, you’d like to get the same property to display it in several places across the page (for instance an author of a posts). I assume, that you use DI and your app creates only one session object per web req uest, injecting it in all the needed places. Consider the following code:
[sourcecode language=”csharp” light=”true”]
var user1 = session.Load
Now try to ReferenceEquals all the returned instances. Yes, that’s the same object! It means that there will be no problems with dirty tracking (what instance should I persist?). Also once an user is loaded with a session object, it can be re-retrieved without db hits. Isn’t it nice?
