[jira] [Created] (LOG4J2-2003) Hierarchical component properties

[Paul Burrowes (JIRA)]

Paul Burrowes created LOG4J2-2003:
-------------------------------------

             Summary: Hierarchical component properties
                 Key: LOG4J2-2003
                 URL: https://issues.apache.org/jira/browse/LOG4J2-2003
             Project: Log4j 2
          Issue Type: Wish
          Components: Configurators
    Affects Versions: 2.8.2
            Reporter: Paul Burrowes
            Priority: Minor


It would be very nice when configuring multiple appenders with complex 
configuration to be able to substitute properties defined in the appender 
section. Being able to create local properties within an appender config would 
remove the need to have the log filename repeated in each attribute that uses a 
variant on it.

The current config only allows properties at the global level thus requires the 
log filename to be repeated multiple times e.g. in this configuration the 
string "MyApp.log" must be repeated three times to construct a 
RollingFileAppender with a delete action.
{noformat}
<Configuration name="MyApp Configuration" status="ERROR">
  <Properties>
    <Property name="MyAppVersionHeader">%d{yyyy-MM-dd HH:mm:ss.SSS} ${VERSION} 
log file started\n</Property>
    <Property name="logDir">${sys:MyApp.dir.work}/log</Property>
    <Property name="VERSION">1c91bff2e</Property>
    <Property name="maxArchivedFiles">4</Property>
  </Properties>
    <RollingFile name="MyAppLog" filePattern="${logDir}/MyApp.log.%i" 
fileName="${logDir}/MyApp.log">
      <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSSZ} %-7level [%logger] 
&lt;%threadName&gt; %mdc %msg%n%throwable" header="${MyAppVersionHeader}"/>
      <SizeBasedTriggeringPolicy size="100MB"/>
      <DefaultRolloverStrategy min="1" max="2147483647">
        <Delete maxDepth="1" basePath="${logDir}">
          <IfAccumulatedFileCount exceeds="${maxArchivedFiles}"/>
          <IfFileName glob="MyApp.log.*"/>
        </Delete>
      </DefaultRolloverStrategy>
    </RollingFile>
...
</{noformat}



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