I'm building a website and I'm starting with the Domain/DAL/whatever-you-want to-call-it layer and have gone with a model/repository/service structure. I have created generic repository base class which takes care of all my CRUD functionality. I also have a generic service which for now is just a wrapper around the repository but also takes care of caching.
The problem I have is that my repository has a GetWhere method which takes a predicate that allows me to grab my entities based on certain criteria. This seemed like quite a common approach when I was doing my research. The service also takes this predicate and will then pass it through to the repository.
The problem I have is that inside the service method, I need to come up with a cache key that is based off what is being searched for in the predicate but I'm not sure how this is done or even if I can get this information at this stage.
Here is my code.
Repository method:
public IQueryable<T> GetWhere(Expression<Func<T, bool>> predicate)
{
return Context.Set<T>().Where(predicate);
}
Service method:
public IQueryable<T> GetWhere(Expression<Func<T, bool>> predicate)
{
var cacheKey = "Football." + predicate.Parameters[0].Type.Name + "." + ???;
var result = cache.Get(cacheKey, () =>
{
var dbResult = repository.GetWhere(predicate);
return dbResult;
});
return result;
}
So what I need is to know what to put in place of the "???" so that I can create a cache key that represents what I'm trying to retrieve so that if I call my service method something like this:
teamService.GetWhere(x => x.Name.Contains("Test"));
...I get a cache key something like "Football.Team.Name.Test" or something.
Please let me know if I am approaching this the wrong way, I feel like I might be.
