add log4j config patch

• Key: DIRSERVER-473
• Type: Improvement
• Status: Closed
• Resolution: Fixed
• Priority: Trivial
• Assignee: Alex Karasulu
• Reporter: Nick Faiz

Description

Please find enclosed a patch (diff file) and a log4j.properties file.

You should create a src/etc directory for main and core and place the properties file there.

Cheers,
Nick

Comments

[Nick Faiz]

  Modifications include adding a preGoal for the 'jar:jar' goal to
the maven.xml of each project to ensure that the log4j.properties is
within the build jar. This preGoal assumes that the log4j.properties
file can be found in main/src/etc/ and core/src/etc/ .

[Emmanuel Lecharny]

Hi, Nick,

could you modify your patch a little bit? The Category class is deprecated (http://www.docjar.com/docs/api/org/apache/log4j/Category.html)
Logger is the class to use.

Is this also possible that you add a test before eacjh log.debug call ?

log.debug( "Search attempt using filter '" + filter + "' "
             + "with scope '" + scope + "' and a return limit of '" + limit
             + "'" );

is expensive as the string is built even if we are not in debug mode.

It's better to write :

if (log.isDebugEnabled())
{
    log.debug(...)
}

Even better, add a
private static final boolean DEBUG = log.isDebugEnabled();

and use it this way :

if (DEBUG)
{
   log.debug(...)
}

As DEBUG will be evaluated only once, the test is faster (no function called).

Thanks a lot !

[Nick Faiz]

Hi Emmanuel,
   Good idea! Thanks for making me not be lazy. :)

   There seems to be a logical inconsistency between the MainFrame class, which uses FilterDialog's own logging settings and the standard log4j logging levels.

    After applying the changes you recommended we run into a scenario where the MainFrame is dumping some of its own logging information, depending on how a setting in a GUI somewhere (I think).

    Anyway, see line 531 of MainFrame.class. This is what I ended up doing:

            else if ( mode == FilterDialog.DEBUG_MODE )
            {
                if (DEBUG)
                {
                    log.debug( "Search attempt using filter '" + dialog.getFilter() + "' "
                        + "with scope '" + dialog.getScope() + "' and a return limit of '"
                            + dialog.getLimit() + "'" );

                }
                else //it would seem we need to make a debug statement, based on a program instruction
                { //which differs to the log4j priority.
                     //in this circumstance we simply use the old System printwriter for stdout.
                    System.out.println( "Search attempt using filter '" + dialog.getFilter() + "' "
                        + "with scope '" + dialog.getScope() + "' and a return limit of '"
                            + dialog.getLimit() + "'" );
                }
            }


   I guess Id ask the question - should the FilterDialog decide anything about logging levels?

Cheers,
Nick

[Emmanuel Lecharny]

Hi Nick,

in MainFrame.class, I think that keeping the code this way should be enough :

 ... else if ( mode == FilterDialog.DEBUG_MODE )
            {
                    log.debug( "Search attempt using filter '" + dialog.getFilter() + "' "
                        + "with scope '" + dialog.getScope() + "' and a return limit of '"
                            + dialog.getLimit() + "'" );

            }

You already have a test on the level, so do not care about the string being built.

Anyway, yes, I think there is an inconstency about debug level used in log4j and FilterDialog.

Be aware that the little optimization I suggested is better suited for server side, not for GUI. So use it when you think it fits your need. Personnaly, I found it confortable to use it everywhere, because it don't arm (except when you want to switch to debug dynamically).

About your last question, I don't know. This is up to you to decide if it should !

Keep up the good job ! We need guys like you working on those pieces of code !

[Alex Karasulu]

Why use log4j 1.2.XXX rather than the 1.3? Just curious.

[Nick Faiz]

Hi Alex,
   Just for convenience. I know that it works. I only discovered just now that a 1.2.9 was available at ibiblio- http://www.ibiblio.org/maven/log4j/jars/ . If 1.3 is the latest it'd be the one to try.

   I'll read through http://www.qos.ch/logging/sc.jsp , r.e. Repository Selectors, on the weekend.

Cheers,
Nick

Hi guys,

The current version is 1.2.11. The next one will be 1.3, and is expected to be out on October.

[Nick Faiz]

Please find attached a configuration for nlog4j, relying on the org.slf4j.Logger interface.

The logging configuration relies upon a log4j.properties file being present in main/src/etc (a directory which should be created). The project.xml states that main/src/etc/log4j.properties is a resource for the source build (handy for including stuff on the classpath in IDEA, probably Eclipse too).

The apacheds project.xml now expresses this dependency - so main, shared, and core will pick it up too.

      <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>nlog4j</artifactId>
        <version>1.2.14</version>
        <url>http://slf4j.org/nlog4j&lt;/url>
      </dependency>

Cheers all,
Nick

[Ceki Gulcu]

Nick,

I appreciate your work on setting up nlog4j at ibiblio. Thank you.

You might want to consider using format patterns as described in [1, 2].
Just to let you know an alternative exists,

[1] http://www.slf4j.org/manual.html (see section "Typical usage pattern")
[2] http://www.slf4j.org/faq.html#2.3

Cheers,

[Alex Karasulu]

Committed revision 225440.

[Emmanuel Lecharny]

Closing all issues created in 2005 and before which are marked resolved