[ 
https://issues.apache.org/jira/browse/LOG4J2-1597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Gary Gregory updated LOG4J2-1597:
---------------------------------
    Description: 
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>
    <ScriptAppenderSelector name="InitAppender">
      <Script language="JavaScript"><![CDATA[
         "OSNameFoo".search("Foo") > -1 ? "List2" : "List1";]]>
      </Script>
      <AppenderSet>
        <List name="List1" />
        <List name="List2" />
      </AppenderSet>
    </ScriptAppenderSelector>
  </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.

  was:
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.


> Add a ScriptAppenderSelector 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>
>     <ScriptAppenderSelector name="InitAppender">
>       <Script language="JavaScript"><![CDATA[
>          "OSNameFoo".search("Foo") > -1 ? "List2" : "List1";]]>
>       </Script>
>       <AppenderSet>
>         <List name="List1" />
>         <List name="List2" />
>       </AppenderSet>
>     </ScriptAppenderSelector>
>   </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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