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https://issues.apache.org/jira/browse/LOG4J2-20?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867812#action_12867812
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Ralph Goers commented on LOG4J2-20:
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In my experimental branch the configuration is separate from the loggers 
returned via LogManager.getLogger(). Once the configuration is active new 
Loggers (actually LoggerConfig objects) cannot be added to the configuration. 
Creating a new configuration is done in such a way that Loggers are never in an 
unconfigured state.  However, adding a new Appender or Filter can be done as 
these operations can be performed safely.

> log4j 2 should have clean separation of configuration from function
> -------------------------------------------------------------------
>
>                 Key: LOG4J2-20
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-20
>             Project: Log4j 2
>          Issue Type: Test
>            Reporter: Curt Arnold
>
> log4j 1.2 does not enforce a clean separation between configuration and 
> service provision.  Some configuration changes take effect immediately, some 
> only on a call to activateOptions and rarely are they appropriately 
> synchronized with the service provision.  log4j 2.0 should have services 
> provided by immutable or at least not externally immutable objects and keep 
> configuration in distinct classes that construct the service providing 
> instance and then replace the existing service with proper synchronization.
> This is related to prefer immutable classes

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