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https://issues.apache.org/jira/browse/LOG4J2-671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14962551#comment-14962551
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Gary Gregory commented on LOG4J2-671:
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I think I would call the plugin "now" or "timestamp", and including it Log4j.
> Property using ${date:} is evaluated multiple times across appenders
> --------------------------------------------------------------------
>
> Key: LOG4J2-671
> URL: https://issues.apache.org/jira/browse/LOG4J2-671
> Project: Log4j 2
> Issue Type: Bug
> Components: Configurators
> Affects Versions: 2.0-rc1
> Environment: OS: Ubuntu 12.04
> Reporter: Robert Veitch
>
> At the top of my log4j2.xml config I have the following properties:
> {code}
> <Properties>
> <Property name="log_date">${date:yyyy-MM-dd'T'HHmmssSSS></Property>
> <Property name="log_path">log/${log_date}</Property>
> </Properties>
> {code}
> I would like to use the "log_path" property as the root log directory for all
> my appenders. By including a timestamp in "log_path" I can distinguish
> between multiple runs of my application. My appenders refer to "log_path" in
> the following way:
> {code}
> <RollingRandomAccessFile name="ApplicationLog" append="true"
> fileName="${log_path}/application.log"
>
> filePattern="${log_path}/application.log-$${date:yyyy-MM-dd'T'HHmmssSSS}.gz">
> ..snip..
> </RollingRandomAccessFile>
> {code}
> I have several such appenders, and I'd like them to all refer to the same
> "log_path" value. Unfortunately, it seems that the property gets re-evaluated
> for each appender, so I end up with multiple log directories on a given run
> of my application. Below is an example:
> ls -al log/
> total 20
> drwxr-xr-x 5 rveitch rveitch 4096 Jun 16 14:12 .
> drwxrwxr-x 6 rveitch rveitch 4096 Jun 16 13:18 ..
> drwxrwxr-x 2 rveitch rveitch 4096 Jun 16 14:12 2014-06-16T141225420
> drwxrwxr-x 2 rveitch rveitch 4096 Jun 16 14:12 2014-06-16T141225462
> drwxrwxr-x 2 rveitch rveitch 4096 Jun 16 14:12 2014-06-16T141225501
> Is there anyway to evaluate a property once, such that the value is frozen
> for re-use across appenders? Is there an alternative approach to generate a
> timestamp which I can use as a part of a common log directory path?
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