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From "Carter Kozak" <cko...@ckozak.net>
Subject Re: Changing the Attributes on a RollingAppender
Date Thu, 22 Aug 2019 13:19:59 GMT
Have you considered using a routing appender[1]? It can write to a specific file based on jvm
system properties, thread context (MDC), or any other pattern parameter.

1. https://logging.apache.org/log4j/2.x/manual/appenders.html#RoutingAppender

On Thu, Aug 22, 2019, at 08:49, Fred Eisele wrote:
> I have an acceptable solution.
> I use the appender-manager and change the filePattern via
>  this.appendManager.setPatternProcessor( new PatternProcessor(
> filePattern, this.appendManager.getPatternProcessor() ) );
> Similarly (using a custom strategy) I change the base fileName.
> Of course the appender object does not reflect these changes but it suits
> my needs.
> 
> On Wed, Aug 21, 2019 at 1:27 PM Ralph Goers <ralph.goers@dslextreme.com>
> wrote:
> 
> > You can’t atomically swap an appender. If you remove it and then add a new
> > one with the same name you will lose log events targeted at the appender
> > while it is removed. You could add a new appender with a different name and
> > then modify all the loggers using the old one to use the new one, but Log4j
> > won’t do that for you.
> >
> > What problem are you trying to solve? Log4j might already have a
> > different way of supporting it.
> >
> 
> I need to be able to change the log fileName and filePattern associated
> with a specific RollingAppender from my running application plugin.
> Is there a way to get an appender directly by name?
> 
> 
> > Ralph
> >
> > > On Aug 21, 2019, at 10:44 AM, Fred Eisele <fredrick.eisele@gmail.com>
> > wrote:
> > >
> > > Could construct a new appender and swap it for the old one?
> > >
> > > On Wed, Aug 21, 2019 at 8:39 AM Ralph Goers <ralph.goers@dslextreme.com>
> > > wrote:
> > >
> > >> No. The file name is immutable.
> > >>
> > >> Ralph
> > >>
> > >>> On Aug 21, 2019, at 6:22 AM, Fred Eisele <fredrick.eisele@gmail.com>
> > >> wrote:
> > >>>
> > >>> Given a RollingFileAppender is it possible to
> > >> dyanamically/programmatically
> > >>> change its fileName?
> > >>>
> > >>> <RollingFile name="X_PLUGIN_FILE"
> > >>> fileName="x.log}"
> > >>> filePattern="x_%i.log}"
> > >>> ignoreExceptions="false">
> > >>> <PatternLayout pattern="#linux %file:%method:%line - %msg%n"
> > >> />
> > >>> <OnDemandTriggeringPolicy />
> > >>> </RollingFile>
> > >>>
> > >>> I need to be able to change the log file from my running application
> > >> plugin.
> > >>
> > >>
> > >>
> > >> ---------------------------------------------------------------------
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> > >> For additional commands, e-mail: log4j-user-help@logging.apache.org
> > >>
> > >>
> >
> >
> >
> > ---------------------------------------------------------------------
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> >
> >
> 

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