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https://issues.apache.org/jira/browse/LOG4J2-1597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15501597#comment-15501597
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Gary Gregory commented on LOG4J2-1597:
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Oops, fixed from copy-paste-adapt of another config file. Good catch! Thank you.
> Add a ScriptSelector Appender to create an Appender specified by a Script
> -------------------------------------------------------------------------
>
> Key: LOG4J2-1597
> URL: https://issues.apache.org/jira/browse/LOG4J2-1597
> Project: Log4j 2
> Issue Type: New Feature
> Components: Appenders
> Reporter: Gary Gregory
> Assignee: Gary Gregory
>
> The use case is to create an OS-based dynamic configuration file.
> The script determines which appender to use (once), and instantiates that
> appender (once). There is no need for one appender to delegate to another
> appender.
> This feature helps you build your configuration dynamically, all from the
> configuration file, to determine which appenders to configure. This is
> different from using a RoutingAppender which creates a level of indirection
> and decides what to do for each log event _at runtime_.
> You can use multiple ScriptSelector Appenders if needed.
> For example:
> {code:xml}
> <Configuration status="WARN" name="RoutingTest">
> <Appenders>
> <ScriptSelector name="InitAppender">
> <Script language="JavaScript"><![CDATA[
> "OSNameFoo".search("Foo") > -1 ? "List2" : "List1";]]>
> </Script>
> <AppenderSet>
> <List name="List1" />
> <List name="List2" />
> </AppenderSet>
> </ScriptSelector>
> </Appenders>
> <Loggers>
> <Root level="error">
> <AppenderRef ref="InitAppender" />
> </Root>
> </Loggers>
> </Configuration>
> {code}
> The new plugins are ScriptSelector (an Appender that builds a different
> ScriptSelector) and AppenderSet, a plugin with deferChildren set to true.
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