Re: [logback-user] JMX on a WebSphere clustered environment

31 May 2012


      Roy's idea of using  LoggerContextListener in conjunction with 
websphere's DynamicCache makes sense as well.

On 31.05.2012 01:36, Roy Cronise wrote:
...
Chris, Since you are using websphere you could use the Dynamic cache
to push the logging levels around to all the servers in the cluster.
You would need to implement a LoggerContextListener to update the
Dynamic cache when a log level changes.  Something like this:
public class LogbackContextListener implements LoggerContextListener {
      private static final String LOG_ID = "LBLOG:";
      public void onLevelChange(Logger logger, Level level)  {
           if (DynamicCacheAccessor.isCachingEnabled()) {
                DistributedMap map = DynamicCacheAccessor.getDistributedMap();
                map.put(LOG_ID + logger.getName(),
level,1,60,60,EntryInfo.SHARED_PUSH, null);  //Update dynamic cache
and push to other servers
       }
}
and a Dynamic Cache ChangeListener, something like this:
public class LogbackCacheChangeListener implements ChangeListener {
    public void cacheEntryChanged(ChangeEvent changeEvent) {
         if (ChangeEvent.LOCAL != changeEvent.getSourceOfChance()) {
//Level not changed on this server then nothing to do
              if
(changeEvent.getId().toString().startswith(LogbackContextListener.LOG_ID))
{  //Log level changed in cache?
                  LoggerContext lc = (LoggerContext)
LoggerFactory.getILoggerFactory();
                  String loggerName =
changeEvent.getId().toString().substring(LogbackContextListener.LOG_ID.length());
                   Logger logger = lc.getLogger(loggerName);
                   logger.setLevel((Level)changeEvent.getValue());
//set logger level on server to what was pushed in cache.
              }
         }
     }
Sorry for any typos...
Roy
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Ceki
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