Description of problem:
I need the ability to format our file naming structure specific to our enterprise rules.

For example, our template specifies
the following:

<appender name="mylog" class="org.apache.log4j.rolling.RollingFileAppender">
   <rollingPolicy class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
     <param name="FileNamePattern" value="/myapp/app_%d{yyyyMMddHHmm}_mylog.log" />
   </rollingPolicy>
</appender>


I know that I can use a periodic-rotating-file-handler to format the file names, but it is restrictive and cannot match our requirements:

<periodic-rotating-file-handler name="FILE" autoflush="true">
     <formatter>
          <pattern-formatter pattern="%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"/>
     </formatter>
     <file relative-to="jboss.server.log.dir" path="server.log"/>
     <suffix value=".yyyyMMddHHmm"/>
     <append value="true"/>
</periodic-rotating-file-handler>