Re: [log4perl-devel] Overwrite Properties in config files

[Kevin G. <ke...@go...>]

That looks like a good solution to me, anybody else have any thoughts?


Kai Poitschke wrote:
> Hi,
> how about a construct like this in the config file?
> 
> log4perl.appender.File.filename = sub { return GetLogflleName(); }
> 
> Kai
> 
> 
> On Thursday 05 December 2002 20:20, Duncan Cameron wrote:
> 
>>On 2002-12-03 Mike Schilli <msc...@ao...> wrote:
>>
>>>Hi there,
>>>
>>>Kai Poitschke has brought up an interestingfeature request: Suppose,
>>>your application had a configuration "-l logfilename" option to specify
>>>the name of the log file to be used. Now, if you have an external
>>>configuration file (as opposed to a string ref passed to init()), how
>>>would you be able to adapt the config file setting in the code?
>>>
>>>He suggests to have init() overwrite certain properties of the config
>>>file like in:
>>>
>>>Dump2OWH.conf:
>>>
>>>log4perl.category.Dump2OWH = INFO, File, Screen
>>>
>>>log4perl.appender.File           = Log::Dispatch::File
>>>log4perl.appender.File.filename  = Dump2OWH.log
>>>log4perl.appender.File.mode      = write
>>>log4perl.appender.File.layout    = Log::Log4perl::Layout::PatternLayout
>>>log4perl.appender.File.layout.ConversionPattern = %d: %m%n
>>>
>>>log4perl.appender.Screen         = Log::Dispatch::Screen
>>>log4perl.appender.Screen.stderr  = 0
>>>log4perl.appender.Screen.layout  = Log::Log4perl::Layout::PatternLayout
>>>log4perl.appender.Screen.layout.ConversionPattern = %-5p> %m%n
>>>
>>>
>>>test.pl:
>>># Einstellungen z.B. aus Programmflags bestimmt
>>>$more_conf = q(log4perl.appender.File.filename = test.log
>>>               log4perl.appender.File.mode = append);
>>>
>>>Log::Log4perl::init('Dump2OWH.conf', $more_conf);
>>>
>>>
>>>I can see at least one other way to implement it: a
>>>not-yet-implemented-in-Log4perl feature like variables in config files
>>>(log4j has something like that but I don't think they can specify the
>>>variable replacement values via code) and a mechanism to define the
>>>placeholders in init(conf_file, key => value, key => value);
>>>
>>>Any other ideas? Sounds like a pretty useful feature to me.
>>
>>Initially I wondered why I couldn't do something like this:
>>
>>Log::Log4perl::init('Dump2OWH.conf');
>>my $appender = get_appender('File');
>>$appender->filename('test.log');
>>
>>but after investigating found that get_appender is part of the log4j
>>API which hasn't been implemented, Log::Dispatch::File doesn't support
>>get and set methods on its instance variables, and, more importantly,
>>that the output file is opened as part of the creation of the
>>appender during the init(), so it's then too late to change the file
>>name.
>>
>>Regards,
>>Duncan Cameron
>>
>>
>>
>>
>>
>>
>>
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> 
> 


-- 
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