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From "Doug Bateman (JIRA)" <>
Subject [jira] Commented: (LOGGING-137) LogFactory.getLog()
Date Wed, 11 Aug 2010 03:03:16 GMT


Doug Bateman commented on LOGGING-137:

P.S. I'm not certain how much performance when scanning is really an issue when it comes to
getting the logger.  After all, reflection is still used to invoke StackTraceElement.getClassName()
for Java 1.4+.  Simplicity should probably count for a little here too.  (Although I'm not
convinced any of the implementations are truly simpler than the others.)

> LogFactory.getLog()
> -------------------
>                 Key: LOGGING-137
>                 URL:
>             Project: Commons Logging
>          Issue Type: New Feature
>    Affects Versions: 1.1.2
>            Reporter: Doug Bateman
>         Attachments:,,,,
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
> Presently, in Apache Commons, the most common way to get a logger is to do something
> public class MyClass {
>     private static Log log = LogFactory.getLog(MyClass.class);
> }
> Notice how MyClass.class (or alternatively a string name) is passed as a parameter. 
The annoying aspect of this is that sometimes the class name doesn't get updated when doing
copy/paste operations.  A desirable alternative might be:
> public class MyClass {
>     private static Log log = LogFactory.getLog(); //class name inferred from call stack
> }
> With such an approach there are two possible concerns I can foresee:
>     * Call stack inspection isn't terribly fast.  However since Loggers are generally
initialized only once, when the class is first loaded, performance isn't likely to be a major
>     * Commons-logging is Java 1.1 compatible.  Thus care must be taken to ensure compatibility
isn't broken.
>     * Commons-logging doesn't depend on commons-lang, and thus the utilities in commons-lang
cannot be used.
> In Java 1.4, the call stack is easily obtained using Thread.getCallStack().  Prior to
Java 1.4, the only way to obtain the call stack is to inspect the stack trace of an exception.

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