Question

I have the following, very interesting class …

pubilc class Thing{

public Thing()
{
    DoSomethingThatTakesALongTime();
}

public boolean CheckSomething(string criteria)
{
    return  criteria == "something";
} }

In my ASP.Net MVC application, I need to make a call to CheckSomething very frequently.

As you can see, the constructor takes a long time to load.

What approaches can I use to cache the class? Keep in mind that I want to keep it testable … and I don’t know what that entails!!!!

Cheers,

ETFairfax

Answer 1

You could use the Factory Pattern to create it (Flyweight pattern to share memory)

Create a Factory that returns an instance of the class. The factory would look like this

if instance in cache

• return cached instance

if not

• create instance
• cache instance
• return instance

For cache you could use HttpContext Cache or Enterprise Library Cache.

EDIT

Interesting discussion below of which pattern this is.

My understanding is as follows:

• I ask something to create the object, that something is a factory, therefore factory pattern.
• I try to reuse an object in memory, flyweight pattern. The python code in this example looks very much like my answer: http://en.wikipedia.org/wiki/Flyweight_pattern
• But there is only a single instance of the object, therefore the singleton pattern
• The cache where the object is stored is also a singleton