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From Karim Bourouba <kar...@hotmail.com>
Subject RE: Defer file creation
Date Tue, 04 Aug 2009 08:57:24 GMT

Hi Wolfgang,


have you considered look at the common logging infrastructure at all? It can work with Log4Net
and could be quite useful for you.






From: wolfgang@wollinet.com
To: log4net-user@logging.apache.org
Subject: RE: Defer file creation
Date: Tue, 4 Aug 2009 10:35:48 +0200

Hi Ross, all
some more details about my setup:
-          WinForm application
-          Use of Windows Workflow Foundation for customer specific jobs
We use log4net for “normal” application logging. Now I need a solution for generating
protocols for the jobs (workflows), meaning, which action were made, errors, and so on. These
jobs run maybe once a week, a month or so. Each job should get its own protocol file. My decision
for using log4net for that, too, was primarily based on the flexibility log4net offers for
defining what gets logged and where. I can activate tracing for these jobs on the fly and
I can switch to a different appender and write everything to the database. Currently there
is no real process in “analyzing” the protocols. The customers simply want them and sometimes
we need them for debugging.
I’m fine with using my “own” appender, I was just looking if I missed some small configuration
value or something like that.
Thx to all for the suggestions and quick responses,

From: Ross Hinkley [mailto:rosshinkley@gmail.com] 
Sent: Montag, 3. August 2009 14:19
To: Log4NET User
Subject: Re: Defer file creation

If you're separating trace information from activity information, then yes, my (somewhat trite)
solution is insufficient.  As noted, it is a bit of a hack.  The custom appender solution
is probably preferable.

Are you using the same logfile for every job?  That seems a touch awkward to me (more so than
one per job), but maybe for your implementation it fits.

After these jobs are run and the log files are written, what's your process after that?  Do
you go in and look to see if any files were made, or is there some automated notification
process?  If it's the latter, I really like Karim's idea - presumably, you'd have some job
set up to let you know there were log files; why not simply run a database report instead?


On Mon, Aug 3, 2009 at 2:19 AM, Wolfgang Trog <wolfgang@wollinet.com> wrote:

Karim, no worries. About the DB … in fact I want to use the flexibility of log4net, to decide
where the logs should go  (file and/or database), to change the log level on the fly and to
separate activities form trace information. So it’s much easier for me, to change the appender
(where I simply have to comment one line) than to write the code for writing it to the database
and then to a log file.






From: Karim Bourouba [mailto:karym6@hotmail.com] 
Sent: Montag, 3. August 2009 09:00

To: log4net-user@logging.apache.org
Subject: RE: Defer file creation


Hi Wolfgang, 


sorry, but I havent really been paying much attention to this thread I am afraid. Is it not
possible for you to write your log to a DB and then create logfiles from that? It seems a
bit long-winded, but could be a solution as opposed to creating your own appender.


From: wolfgang@wollinet.com
To: log4net-user@logging.apache.org
Subject: RE: Defer file creation
Date: Mon, 3 Aug 2009 08:43:56 +0200

Hi Ross,


thx for the suggestion. I can’t defer the logger configuration, because I need basic logging
from the beginning. I could probably use a separate log file for each job, but that seems
a bit awkward. I think I’ll stick to the “write my own appender” approach for the moment.






From: Ross Hinkley [mailto:rosshinkley@gmail.com] 
Sent: Freitag, 31. Juli 2009 18:02
To: Log4NET User
Subject: Re: Defer file creation


Off the top of my head: doesn't the logfile only get generated if the logger is configured?
 Rather than deferring the log file getting created, couldn't you defer execution of the configurator?

You could use a getter to run the configurator, like the following:

private static ILog _log = LogManager.GetLogger(typeof(Program));
public static ILog log
            log4net.Config.XmlConfigurator.Configure(new FileInfo(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile));
        return _log;

This way, your logger will only get configured (and the file subsequently made) if something
is logged.

Is it a hack?  Absolutely.  But it's the quickest way I could think of to answer your question.


On Fri, Jul 31, 2009 at 10:23 AM, Wolfgang Trog <wolfgang@wollinet.com> wrote:

For now, I  tried a quick hack and modified FileAppender and it’s now working like I want:
override public void ActivateOptions()
            if ( m_fileName != null )
                //SafeOpenFile( m_fileName, m_appendToFile );
                LogLog.Warn( "FileAppender: File option not set for appender [" + Name + "]."
                LogLog.Warn( "FileAppender: Are you using FileAppender instead of ConsoleAppender?"
I would prefer a solution, where I don’t have to use my own appender, but at least I have
a workaround.

From: Wolfgang Trog [mailto:wolfgang@wollinet.com] 
Sent: Freitag, 31. Juli 2009 17:15
To: 'Log4NET User'

Subject: RE: Defer file creation

I want to create protocols for jobs that can be executed in our application, preferably one
file per job and execution. But I don’t want a file, if the job is not executed. The jobs
are only executed once a month for example. 

Thx for the quick response !

From: Karim Bourouba [mailto:karym6@hotmail.com] 

Sent: Freitag, 31. Juli 2009 17:06

To: log4net-user@logging.apache.org

Subject: RE: Defer file creation


Hi There, 
I dont think I have an answer to your question just now - but can I ask why you would prefer
to defer creating the log file?


From: wolfgang@wollinet.com
To: log4net-user@logging.apache.org
Subject: Defer file creation
Date: Fri, 31 Jul 2009 16:15:28 +0200

Hi Everbody,
I’m looking for a way to defer the creation of the log file until the first entry is logged.
I want to use log4net for writing protocols for jobs that can be executed in my application.
With my current configuration the file is created during startup which makes no sense if the
job doesn’t run.  
My current configuration:
      <appender name="…" type="log4net.Appender.RollingFileAppender">
        <file value="....." />
        <appendToFile value="false" />
        <rollingStyle value="Date" />
        <datePattern value="yyyy_MM_dd.\tx\t" />
        <staticLogFileName value="false" />
        <threshold value="INFO" />
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%date;%level;%m%n" />
One possibility seems to be to generate the appender programmatically, but then I lose a lot
of flexibility. Another one is writing my own appender (or subclassing an existing one). Is
there another way ?
Any help is appreciated,


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