> import org.apache.tools.log4j.Category;
>
> public class LoggerFactory {
>
> private static boolean configured = false;
>
> private static void configure() {
> if (!configured) {
> /*** Place all your configuration stuff here. ***/
> configured = true;
> }
> }
>
> public static Category getInstance(Class c) {
> configure();
> return Category.getInstance(c);
> }
>
> public static Category getInstance(String s) {
> configure();
> return Category.getInstance(s);
> }
>
> }
This isn't thread-safe, because if two threads call getInstance()
at the same time, your configure code could run twice. A slightly
better solution would be to use synchronized to make sure it's
thread safe. This is technically against the J2EE spec. Here it
is anyway:
private static void configure() {
if(!configured) {
synchronized(LoggerFactory.class) {
if(!configured) {
/** Do config */
configured = true;
}
}
}
}
Note the double-check of the configured boolean.
Having said all that, running config code twice probably isn't the
end of the world, and might not happen very often.
Regards,
Mike.
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