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https://issues.apache.org/jira/browse/LOG4J2-628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13986881#comment-13986881
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Bryan Hsueh commented on LOG4J2-628:
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Correct, my use case is not performance related.  Instead, I implement Clock so 
that I can decide whether to use System time or my own artificial, simulated 
time.  

I am simulating a program against historical data.  So, when I run 
historically, I want to see my historical timestamp.  When I run live, I want 
to see the System timestamp.  My Clock:currentTimeMillis() decides this for me.

> Cannot set log4j.Clock with Async appender
> ------------------------------------------
>
>                 Key: LOG4J2-628
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-628
>             Project: Log4j 2
>          Issue Type: Question
>          Components: Appenders
>    Affects Versions: 2.0-rc1
>         Environment: Ubuntu 12.04 / Java 7
>            Reporter: Bryan Hsueh
>
> I override log4j.Clock to support a "live" time vs a "simulated" time.  
> System.setProperty("log4j.Clock", "teambh.trade.utils.MyClock");
> If I use asynchronous loggers, it works fine and calls my 
> Clock:currentTimeMillis().  
> If I switch to async appenders, currentTimeMillis() is not called.
> Is this expected behavior or a bug?  
> Thanks



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