Question

I have various function classes that preform long calculation. Currently every access to the result of the functions means recalculating the functions. That’s why I want to incorporate MemoryCache in my solution. But the problem is that I need a ChangeMonitor Class that monitors the function class for changes. I have seen examples that monitor a file. My question is: do I need to write a custom ChangeMonitor or am I missing a simple solution?

An example just to be clear:

class MyFunction
{
    //I want to monitor changes to these parameters
    private int param1;
    private int param2;

    //This result should be cached
    public int GetResult()
    {
        return param1 * param2;
    }
};

Answer 1

Thanks for all the answers.

I realized that if I want to use the ChangeMonitor class I would have to extend it to monitor memory segments. The better solution in my case would be to alert the cache that a function result has changed. I have done this by adding a method ‘Reset’ to MyFunction class. Every time a parameter changes I just call the Reset function which will invalidate the cache.