Re: Idiom for forcing class loading?
Tom Anderson wrote:
We have a class which does some setup in a static block that needs to
happen early in the lifecycle of the app (this is a dubious design, but
there you go - it's largely forced on us from without). Thus, it needs
to get loaded early. We have an initialiser class which runs at a
suitable time, so that's where we'll load the class. What's the best way
to do this?
Before i came to it, the code looked like:
void initialise() {
Class.forName("com.example.Foo");
}
I didn't like that, because it's using a string constant where it could
be using something strongly typed, and so not getting enabling
refactoring and inspection in the IDE. I had a bit of a debate with my
pair, and we changed it to:
void initialise() {
Class.forName(Foo.class.getName());
}
Which works, solves the problem, and is clearly bonkers.
What's a good idiom? One option would be to call a no-op method on the
class literal:
void initialise() {
Foo.class.getName();
}
But that's a bit hackish too. I could just store it in a local:
void initialise() {
Class foo = Foo.class;
}
Since i actually have several classes, i could put them in an array:
void initialise() {
Class[] loadedClasses = new Class[] {Foo.class, Bar.class, Baz.class};
}
Am i right in thinking that all of these will force loading of Foo? Does
anyone have any other idioms? How about any opinions on which idiom is
best, or at least most idiomatic?
I don't think the problem is common enough to make a solution idiomatic.
I would without thinking twice:
- read class names from config file
- use Class.forName to initialize them
Arne
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