Programmatically configure LogBack appender

Question

I have a logback appender defined in the logback.xml, it\'s a DB appender, but I\'m curious if there is any way to configure the appender in java using my own connection poo

Answer 1

Not allowed to comment (yet?), I'd just like to add three tips;

• regarding the caveats above, if you have problems, just add a call to

  StatusPrinter.print(context);
  

  after everything has been configured, that is, after having added your appenders the root/"Main" appender: it will tell you what is wrong.

• I like very much to separate logging-levels in different files; when looking for errors I begin with looking in the error file and so on, having them set up like

tot_[app name].log   : Level.INFO
deb_[app name].log   : Level.DEBUG
err_[app name].log   : Level.ERROR

routing by means of a simple private filter class such as

    private static class ThresholdLoggerFilter extends Filter {

        private final Level level;

        private ThresholdLoggerFilter(Level level){
            this.level = level;
        }

        @Override
        public FilterReply decide(ILoggingEvent event) {
            if (event.getLevel().isGreaterOrEqual(level)) {
                return FilterReply.NEUTRAL;
            } else {
                return FilterReply.DENY;
            }
        }
    }

and then just call myFilter.start() and myAppender.addFilter(myFilter);.

• Lastly, putting it together, I usually want to be able to change log levels dynamically having the setup implement some simple interface like

  public interface LoggingService {
      void setRootLogLevel(Level level);
  }
  

keeping the root logging level in some property-file which is monitored so that whenever there is some valid input there, I just call this service implemented like

    @Override
    public void setRootLogLevel(Level level) {
        if (context != null && context.isStarted()) {
        ((Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME)).setLevel(level);
        }
    }

with my new root logger level.