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From Ralph Goers <ralph.go...@dslextreme.com>
Subject Re: [jira] Commented: (LOG4J2-33) Support Annotations
Date Sat, 15 May 2010 07:25:47 GMT

On May 14, 2010, at 11:53 PM, Thorbjørn Ravn Andersen wrote:

> Den 15/05/10 08.29, Ralph Goers (JIRA) skrev:
>> My experimental branch uses annotations for Logj components, but still does not address
my desire to allow applications to inject logging.
>>   
> Annotations are just meta-information.  You will need the classloader to take special
action on them for anything to happen.

That depends if it is a compile time annotation or runtime annotation. With Java 6 compile
time annotations can leverage the annotation processor during compilation to do all sorts
of interesting things.
 
> 
> I am cracking the nut of how to get "@Inject Logger log" to work properly with slf4j
in a JEE 6 setting - I believe it is a case of a correctly placed @Producer.  Is this similar
to what you want to solve?


I haven't sat down and spec'd it out but something like:

@Logger Logger logger;

@LogFlow
public class MyClass {

	public void method1(String parm1) {
        ...
        }
}

which would inject the logger and the entry and exit tracing. It would be even better if you
could do


	public void method1(String parm1) {
        	...
       		@debug result = callService(parm1);
         }

and have the debug generate a message like "callService with parm1=value returned result n"
or "calling callService with parm 1" followed by "callService returned result n".

Unfortunately, I don't believe this is possible since annotations aren't allowed on a statement.

Ralph


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