logback configuration with programmatically

logback-conf-snip

        LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
        StatusManager statusManager = lc.getStatusManager();

        if (statusManager != null) {
            statusManager.add(new InfoStatus("Configuring logger", lc));
        }

        SiftingAppender sa = new SiftingAppender();
        sa.setName("SIFT");
        sa.setContext(lc);

        MDCBasedDiscriminator discriminator = new MDCBasedDiscriminator();
        discriminator.setKey("vhost");
        discriminator.setDefaultValue("administration");
        discriminator.start();

        sa.setDiscriminator(discriminator);

        sa.setAppenderFactory(new AppenderFactory<ILoggingEvent>() {

            @Override
            public Appender<ILoggingEvent> buildAppender(Context context, String discriminatingValue) throws JoranException {
                RollingFileAppender<ILoggingEvent> appender = new RollingFileAppender<>();
                appender.setName("ROLLINGFILE-" + discriminatingValue);
                appender.setContext(context);
                appender.setFile(discriminatingValue + ".log");

                TimeBasedRollingPolicy<ILoggingEvent> policy = new TimeBasedRollingPolicy<>();
                policy.setContext(context);
                policy.setMaxHistory(5);
                policy.setFileNamePattern(discriminatingValue + "-%d{yyyy-MM-dd-HH-mm}-%i.log.gz");
                policy.setParent(appender);
                policy.start();

                SizeAndTimeBasedFNATP<ILoggingEvent> innerpolicy = new SizeAndTimeBasedFNATP<>();
                innerpolicy.setContext(context);
                innerpolicy.setMaxFileSize("512KB");
                innerpolicy.setTimeBasedRollingPolicy(policy);
                innerpolicy.start();

                policy.setTimeBasedFileNamingAndTriggeringPolicy(innerpolicy);
                policy.start();

                appender.setRollingPolicy(policy);

                PatternLayoutEncoder pl = new PatternLayoutEncoder();
                pl.setContext(context);
                pl.setPattern("%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n");
                pl.start();
                appender.setEncoder(pl);

                appender.start();
                return appender;
            }
        });

        sa.start();
        ch.qos.logback.classic.Logger rootLogger = lc.getLogger(ch.qos.logback.classic.Logger.ROOT_LOGGER_NAME);
        rootLogger.detachAppender("console");
        rootLogger.addAppender(sa);

        String vhosts[] = {"test.com", "test2.com", "abc.test.com"};
        Logger logger = LoggerFactory.getLogger(App.class);
        for (long i = 0; i < 10000000; i++) {
            try {
                Thread.sleep(1);
            } catch (InterruptedException ex) {
                logger.error("interrupt error", ex);
            }
            MDC.put("vhost", vhosts[(int)i%3]);
            logger.info("hello my dear " + i);
        }

        System.out.println("Hello World!");
    }