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From "Gary Gregory (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (LOG4J2-649) Close a dynamically created appender
Date Tue, 28 Apr 2015 04:54:07 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14516360#comment-14516360
] 

Gary Gregory edited comment on LOG4J2-649 at 4/28/15 4:53 AM:
--------------------------------------------------------------

Wild idea/possible brain fart: Why not register a special JMX MBean that you can then call
to reconfigure Log4j at will. This would have the same effect as Log4j noticing that its configuration
file has changed, which then causes it to reconfigure itself (assuming you have {{monitorInterval}}
declared in the root XML element of your config file. This would have the advantage of not
requiring additional internal APIs, just registering the right kind of MBean (or MXBean).
The calling of the MBean can be done through {{jconsole}} or programatically. This would also
mean that the appender does not disapear from under you if that is a concern.


was (Author: garydgregory):
Wild idea/possible brain fart: Why not register a special JMX MBean that you can then call
to reconfigure Log4j at will. This would have the same effect asLog4j noticing that its configuration
file has changed, which then causes it to reconfigure itself (assuming you have {{monitorInterval}}
declared in the root XML element of your config file. This would have the advantage of not
requiring additional internal APIs, just registering the right kind of MBean (or MXBean).
The calling of the MBean can be done through {{jconsole}} or programatically. This would also
mean that the appender does not disapear from under you if that is a concern.

> Close a dynamically created appender
> ------------------------------------
>
>                 Key: LOG4J2-649
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-649
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: API, Appenders
>    Affects Versions: 2.0-rc1
>         Environment: Windows 7 (64-bit)
>            Reporter: Andrew Rose
>            Assignee: Ralph Goers
>
> I'm using the Routing functionality in Log4j 2 to dynamically create appenders at runtime.
When I know that those appenders are finished with, I'd like to tell Log4j so that it can
tidy up the related resources (flush & close files, free its internal objects related
to those appenders, etc.). Without doing this, Log4j still has open file handles and I'm unable
to manipulate the files that it has written (from an external process which post-processes
and archives the logs).
> Remko Popma tells me (via the stackoverflow answer at http://stackoverflow.com/a/23827382/799399)
that there is no way of doing this at the moment.  I'd like to request that you consider enhancing
Log4j 2 in this way.
> I enclose my configuration below, in case it's relevant (but I think all the details
you need are included in the above description).
> {code}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="WARN">
>   <Appenders>
>     <Console name="Console" target="SYSTEM_OUT">
>       <PatternLayout pattern="%d{HH:mm:ss.SSS} %level{ERROR=!, WARN=?, INFO=-, DEBUG=.,
TRACE=.} %msg%n"/>
>     </Console>
>     <Routing name="MatchLogs">
>       <Routes pattern="$${ctx:matchID}">
>         <Route>
>           <RandomAccessFile name="MatchLog-${ctx:matchID}" fileName="logs/${ctx:matchID}.log">
>             <PatternLayout pattern="%d{ISO8601} %-5level %-30.30logger{1} %msg%n"/>
>           </RandomAccessFile>
>         </Route>
>       </Routes>
>     </Routing>
>     <Async name="AsyncWrapper">
>       <AppenderRef ref="MatchLogs" level="debug"/>
>       <AppenderRef ref="Console" level = "info"/>
>     </Async>
>     <Routing name="MatchStatsLogs">
>       <Routes pattern="$${ctx:matchID}">
>         <Route>
>           <RandomAccessFile name="MatchStatsLog-${ctx:matchID}" fileName="logs/${ctx:matchID}_stats.log">
>             <PatternLayout pattern="%msg"/>
>           </RandomAccessFile>
>         </Route>
>       </Routes>
>     </Routing>
>     <Async name="AsyncStatsWrapper">
>       <AppenderRef ref="MatchStatsLogs" level="debug"/>
>     </Async>
>   </Appenders>
>   <Loggers>
>     <Logger name="stats" level="trace" additivity="false">
>       <AppenderRef ref="AsyncStatsWrapper"/>
>     </Logger>
>     <Root level="debug">
>       <AppenderRef ref="AsyncWrapper"/>
>     </Root>
>   </Loggers>
> </Configuration>
> {code}



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