> From: Christopher Schultz [mailto:[email protected]]
> Subject: Re: using static helper classes within servlets
>
> You can get a significant performance improvement by doing this
> instead:
>
> private static final SomeBean someBean = new SomeBean();
>
> public static getSomeBean() {
> return someBean;
> }
>
> Of course, if you're going for delayed/lazy instantiation, you're not
> going to get it, but you at least drop the penalty for synchronization.
Using an initialize-on-demand holder class permits lazy instantiation:
class MyClass {
...
private static class LazySomethingHolder {
public static final Something something = new Something();
}
...
public static Something getInstance() {
return LazySomethingHolder.something;
}
...
}
The LazySomethingHolder will be loaded - but not initialized - when MyClass is
loaded. Initialization will occur only when MyClass.getInstance() is invoked.
The necessary synchronization during initialization is all handled internally
by the JVM.
- Chuck
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