log4perl-devel — Ongoing log4perl development

[log4perl-devel] Rate throttling mechanism

[<Jam...@ub...>]

Hi Mike,

I was wondering if it would be possible to throttle messages based on =
the rate (number) of messages. This feature would be useful if you would =
like to control the number of messages being sent over a period of time. =


Kind Regards

James Wells

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[log4perl-devel] Log::Log4perl 0.51 released

[Mike S. <msc...@ya...>]

Hi all,

just released Log::Log4perl 0.51 to the log4perl.sourceforge.net, here's what's new:

0.51 (01/08/2005)
    * (ms) Jon Bjornstad noticed that the file appender wasn't including
           $! in the die() exception thrown if open_file() fails. Added it.
    * (ms) Added umask option to file appender
    * (ms) Fix to L4p::Util::module::available() for Win32
           compliance by Roger Yager <rog...@ey...>
    * (ms) Added check to L4p::Util::module_available() returning true
           if the pm file is available in %INC, indicating that it has
           already been loaded. This fixes a problem when running L4p
           in a PAR binary.
    * (ms) Added remove_appender() and eradicate_appender() method to
           Logger.pm, test cases and documentation on the main Log4perl
           page.
    * (ms) Added a generic buffered composite appender, L4p::Appender::Buffer,
           buffering messages until a trigger condition is met.
    * (ms) Added umask FAQ

If all goes well, it'll hit CPAN in a couple of days. Pound on it and let me know
if there's anything unusal except great new features :).

-- Mike

Mike Schilli
msc...@ya...

Re: [log4perl-devel] Log::Log4perl error

[Mike S. <m...@pe...>]

On Tue, 4 Jan 2005, Wrigley, Ave wrote:

> I am getting the following error occasionally on exit:
>
> Use of uninitialized value in subroutine entry at
> /usr/local/lib/perl5/site_perl/5.8.5/Log/Log4perl/Logger.pm line 684
> during global destruction.
> 	(in cleanup) Undefined subroutine &main:: called at
> /usr/local/lib/perl5/site_perl/5.8.5/Log/Log4perl/Logger.pm line 684
> during global destruction.

Are you using the latest Log4perl? The problem you're seeing looks like
it got fixed in 0.49. If not, please provide a code snippet and I'll
investigate.

-- Mike

Mike Schilli
m...@pe...

[log4perl-devel] Log::Log4perl error

[Wrigley, A. <Ave...@it...>]

Hi,

I am getting the following error occasionally on exit:

Use of uninitialized value in subroutine entry at
/usr/local/lib/perl5/site_perl/5.8.5/Log/Log4perl/Logger.pm line 684
during global destruction.
	(in cleanup) Undefined subroutine &main:: called at
/usr/local/lib/perl5/site_perl/5.8.5/Log/Log4perl/Logger.pm line 684
during global destruction.

Any ideas what might be causing this? I can send relevant code if it
helps!

Ave.

Ave Wrigley
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[log4perl-devel] Message Blocked Due to File Restriction

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RE: [log4perl-devel] File compression and compiling (fwd)

[Mike S. <m...@pe...>]

On Thu, 16 Dec 2004, Roger Yager wrote:

Hi Roger, please see my comments below ...

> 	I've tried the latest version of log4perl but still run
> into issues compiling with perlapp.  I was originally
> using the --add option to include the additional modules,
> however, perlapp doesn't bother to update %INC/@INC so the
> module_available() function is unable to find the modules
> even though they have been included in executable.
>  Therefore, I've gone ahead and included them directly
> into the main package.  However, perlapp never bothered to
> ensure the path delimiter was correct for the platform
> that it compiled on (it is using / as the delimiter).  As
> a result your search of the %INC doesn't find the module.
> :-(
>
> 	I know the right thing to do is to get ActiveState to fix
> perlapp but that is probably not going to happen anytime
> soon.  Thus, it was necessary to modify the
> module_available() function to check for entries with '/'
> as a delimiter in addition to the checks it is already
> doing.
>
>      my $relpath = File::Spec->catfile(split /::/,
> $full_name) . '.pm';
>      $full_name = join('/', split(/::/, $full_name)) .
> '.pm';
>
>      return 1 if exists $INC{$relpath} || exists
> $INC{$full_name};
>

I've shuffled the code around a bit, but your added logic is in
place now, please double check:

    http://perlmeister.com/tmp/Log-Log4perl-0.51.tar.gz

-- Mike

Mike Schilli
m...@pe...

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RE: [log4perl-devel] File compression and compiling

[Roger Y. <rog...@ey...>]

Mike,

	I understood the problem with the eval statement, however, the way
perlapp was including the modules didn't match were the eval/require was
looking for them.  Now that you are looking in the %INC first it shouldn't
be a problem.

Thanks,
Roger Yager

-----Original Message-----
From: Mike Schilli [mailto:m...@pe...] 
Sent: Tuesday, December 14, 2004 11:01 PM
To: Roger Yager
Cc: log...@li...
Subject: Re: [log4perl-devel] File compression and compiling

Hi Roger,

just had another look at L4p and realized that List::Util::module_available
wasn't doing the right thing. I've applied a fix to 0.51 (not yet released,
but available for preview at http://perlmeister.com/tmp) to check %INC first
and verify that the module has already been loaded, just as Kevin suggested.
This seems to fix the problem with PAR. Give it a whirl!

-- Mike

Mike Schilli
m...@pe...

RE: [log4perl-devel] File compression and compiling

[Roger Y. <rog...@ey...>]

Kevin,

	I've attached a copy of the CompressedFile appender module that I've
written based on your recommendation below.  Please let me know if I've
missed anything.

	As for the change to the Log::Log4perl::Config module, here is the
diff -u:
$ diff -u Log-Log4perl-Conf*
--- Log-Log4perl-Config-ry.pm   2004-12-03 11:35:27.258550400 -0500
+++ Log-Log4perl-Config.pm      2004-12-03 11:28:14.626456000 -0500
@@ -461,8 +461,6 @@
         }
     }

-    $layout_class = ($layout_class !~ /::/) ?
"Log::Log4perl::Layout::$layout_class" : $layout_class;
-
     eval "require $layout_class" or
         die "Require to $layout_class failed ($!)";

	This ensures that regardless if the module is available or not, we
have the full package name for the layout.

	Yes, the change I made to the util module essentially disabled the
function.

Roger Yager


-----Original Message-----
From: Kevin M. Goess [mailto:ke...@go...] 
Sent: Monday, December 13, 2004 1:49 AM
To: rog...@ey...
Cc: log...@li...
Subject: Re: [log4perl-devel] File compression and compiling

Roger, thanks for your submission, sorry for the late response, it's 
been a busy week for me, and I suspect Mike Schilli is out of town.  A 
small point, diff -u is somewhat more traditional and easy to read than 
diff -c.

 >       Also, I have included file compression (using IO::Zlib) into the
 > Log::Log4perl::Appender::file (see diff below).

An interesting idea.  It looks to me like this changes the semantics of 
Appender::File to the point where it would be better off in its own 
appender class, like Appender::CompressedFile.  It clashes with "pipe", 
which you handle, as well as with "autoflush", which you don't.  And I 
wonder about the reliability/performance if the IO::Zlib uses the 
external gzip option.

> .         Modified Log::Log4perl::Config to handle abbreviated layout 
> names outside of the call to Log::Log4perl::Util::module_available (see 
> diff below).

I see from your diff where you took it out, but where did you put it 
back in?

> .         Modified Log::Log4perl::Util::module_available to always 
> return true  (see diff below).

Which disables the function, correct?

Mike, shouldn't the module_available check %INC first, in which case it 
doesn't have to try to load the module at all?


-- 
Happy Trails . . .

Kevin M. Goess
(and Anne and Frank)
904 Carmel Ave.
Albany, CA  94706
(510) 525-5217

Re: [log4perl-devel] Removing Log4perl appenders at runtime?

[Bart P. <ba...@la...>]

Mike

On Wed, 15 Dec 2004, Mike Schilli wrote:

> Docs and test cases have been updated.

Now that you've quickly completed all of this free work for me, I 
have a little project I'd like you to look at...  :-)

Thanks for all of your help,

Bart

[log4perl-devel] Re:

[<dr...@pa...>]

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----817695069159687870--

Re: [log4perl-devel] Removing Log4perl appenders at runtime?

[Mike S. <m...@pe...>]

On Wed, 15 Dec 2004, Bart Parliman wrote:

> The files are periodically opened throughout a long running
> process and it is not known ahead of time where they will be
> located or what they will be called.  Basically the process
> looks like this ...
>
> daemon starts
> init L4p (setup master logfile)
> ...
> work named "foo" comes in
> create a "foo" work directory
> open "foo" logfile in that directory
> do work in new directory (generate reports, etc.)
> close work event logfile
> tar up directory
> archive it off somewhere
> ...
> work named "bar" comes in
> create a "bar" work directory
> (repeat)
> ...

Ok, gotcha. Another way to accomplish this would have been
a custom appender that

a) creates new files on demand (i.e. upon log(), not new())
b) uses something like the MDC as described in
   http://log4perl.sourceforge.net/d/Log/Log4perl.html#4b5b3
   to determine the current file name

> In the future multiple work events may occur in parallel.

Dicey! Then you have to set the MDC with every logging call. How
do you solve that with dynamically created appenders?

> This logs properly, but the appender's DESTROY method is not
> called until the process terminates, even if I destroy the
> appender in my code (e.g. with undef, or it goes out of scope).
> Since the file is closed when the appender goes away, it will
> remain open.
>
> It looks like there is a reference to the appender in the
> Log::Log4perl::Logger::APPENDER_BY_NAME hash.  Just as a test, I
> noticed that if I delete that entry by hand after undef'ing the
> appender, the appender is destroyed as well.

Ah, good one. The problem is that remove_appender() removes an
appender from a logger, but it could still be used by other loggers.
And even if not, you could have an appender in your conf file which
no one uses, but it's still in the system, waiting for someone
to call add_appender(). So L4p can't forget about the appender
just because it gets removed from one logger or even all loggers.

So, I've added another call, eradicate_appender(), which can be
called either as L4p->eradicate_appender($name) or
$logger->eradicate_appender($name), which will do what you like:

To eradicate an appender from the system,
you need to call C<Log::Log4perl-E<gt>eradicate_appender($appender_name)>
which will first remove the appender from every logger in the system
and then will delete all references Log4perl holds to it.

Docs and test cases have been updated.

> Also a couple of minor issues with the new documentation...

Fixed, thanks!

> Besides a minor formatting issue, the user probably shouldn't
> call the appender's DESTROY method to get rid of it (since perl
> does that internally), but merely undef it instead.

By all means, what was I thinking :).

I've fixed it, thanks for pointing this out!

New tarball on

    http://www.perlmeister.com/tmp/Log-Log4perl-0.51.tar.gz

-- Mike

Mike Schilli
m...@pe...

Re: [log4perl-devel] Removing Log4perl appenders at runtime?

[Mike S. <m...@pe...>]

On Wed, 15 Dec 2004, Bart Parliman wrote:

> For the short term this is fine.  I'm actually reusing my own
> subclass under Log::Dispatch::Output(?) so I could add something
> similar there.  The main issue is that I may have multiple log
> files files that need to be opened at the same time (i.e. so it's
> not exactly like a log file that is periodically switched).

Not sure if I fully understand the requirements ... isn't it good
enough to open them all at startup (or L4p init time)?

In any case, I've added remove_appender() yesterday, see the latest tarball:

    http://www.perlmeister.com/tmp/Log-Log4perl-0.51.tar.gz

There's also a paragraph of documentation within the main Log4perl docs
on it, especially what to do for appender cleanup.

Let me know if it works for you ...

-- Mike

Mike Schilli
m...@pe...

Re: [log4perl-devel] Removing Log4perl appenders at runtime?

[Bart P. <ba...@la...>]

On Tue, 14 Dec 2004, Mike Schilli wrote:

> On Sun, 12 Dec 2004, Kevin M. Goess wrote:
>
>>> Is there a clean way to remove appenders at runtime?
>
>> Not currently, that I know of anyway.
>
> Nope, looks like we need to add one.

That would be great.

> For now, could you use Log::Log4perl::Appender::File's file_switch()
> method instead?

For the short term this is fine.  I'm actually reusing my own 
subclass under Log::Dispatch::Output(?) so I could add something 
similar there.  The main issue is that I may have multiple log 
files files that need to be opened at the same time (i.e. so it's 
not exactly like a log file that is periodically switched).

Thanks,
Bart

Re: [log4perl-devel] File compression and compiling

[Mike S. <m...@pe...>]

On Tue, 14 Dec 2004, Mike Schilli wrote:

> that List::Util::module_available wasn't doing the right thing

Ouch, I meant L4p::Util::module_available, of course :)

-- Mike

Mike Schilli
m...@pe...