Java 类org.apache.logging.log4j.core.config.LoggerConfig 实例源码

@PUT
@Path("/log/change-level/{loggerName}/{newLevel}")
public Response changeLogLevel(@PathParam("loggerName") String loggerName,
                               @PathParam("newLevel") String newLevel) {

    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    Configuration config = ctx.getConfiguration();
    LoggerConfig loggerConfig = config.getLoggerConfig(loggerName);

    if (loggerConfig.getName().equals(LogManager.ROOT_LOGGER_NAME)) {
        return Response.ok("Not found", MediaType.TEXT_PLAIN).build();
    }

    loggerConfig.setLevel(Level.valueOf(newLevel));
    ctx.updateLoggers();  // This causes all Loggers to refetch information from their LoggerConfig.

    return Response.ok("Done", MediaType.TEXT_PLAIN).build();
}

/**
 * Looks up the logger in the logger factory,
 * and attempts to find the real logger instance
 * based on the underlying logging framework
 * and retrieve the logger object. Then, updates the level.
 * This functionality at this point is heavily dependant
 * on the log4j API.
 *
 * @param loggerName  the logger name
 * @param loggerLevel the logger level
 * @param additive    the additive nature of the logger
 * @param request     the request
 * @param response    the response
 * @throws Exception the exception
 */
@PostMapping(value = "/updateLoggerLevel")
@ResponseBody
public void updateLoggerLevel(@RequestParam final String loggerName,
                              @RequestParam final String loggerLevel,
                              @RequestParam(defaultValue = "false") final boolean additive,
                              final HttpServletRequest request,
                              final HttpServletResponse response) throws Exception {
    ensureEndpointAccessIsAuthorized(request, response);

    Assert.notNull(this.loggerContext);

    final Collection<LoggerConfig> loggerConfigs = getLoggerConfigurations();
    loggerConfigs.stream().
            filter(cfg -> cfg.getName().equals(loggerName))
            .forEachOrdered(cfg -> {
                cfg.setLevel(Level.getLevel(loggerLevel));
                cfg.setAdditive(additive);
            });
    this.loggerContext.updateLoggers();
}

protected final void registerParent(Class<? extends BaseLog4j2Configuration> clazz){
    BaseLog4j2Configuration configuration;
    try{
        configuration = clazz.newInstance();
    }catch(InstantiationException | IllegalAccessException e){
        throw new RuntimeException(e);
    }
    for(Appender appender : configuration.getAppenders()){
        addAppender(appender);
    }
    for(LoggerConfig loggerConfig : configuration.getLoggerConfigs()){
        addLoggerConfig(loggerConfig.getName(), loggerConfig.getLevel(), loggerConfig.isAdditive(), loggerConfig
                .getAppenders().values());
    }
    for(Filter filter : configuration.getFilters()){
        addFilter(filter);
    }
}

public void watch(Class<?> loggerClass, Level level) {
    this.loggerClass = loggerClass;
    Appender appender = new AbstractAppender(APPENDER_NAME, null, PatternLayout.createDefaultLayout()) {
        @Override
        public void append(LogEvent event) {
            logEvents.add(event);
        }
    };
    appender.start();
    final LoggerContext ctx = getLoggerContext();
    LoggerConfig loggerConfig = ctx.getConfiguration().getLoggerConfig(loggerClass.getName());
    oldLevel = loggerConfig.getLevel();
    loggerConfig.setLevel(level);
    loggerConfig.addAppender(appender, level, null);
    ctx.updateLoggers();
}

public synchronized boolean removeAlertListener(final DistributedMember member) {
  final boolean memberWasFound = this.listeners.remove(new Listener(null, member));

  if (memberWasFound) {
    if (this.listeners.size() == 0) {
      this.appenderContext.getLoggerContext().removePropertyChangeListener(this);
      this.appenderContext.getLoggerConfig().removeAppender(APPENDER_NAME);

    } else {
      LoggerConfig loggerConfig = this.appenderContext.getLoggerConfig();
      loggerConfig.addAppender(this, this.listeners.get(0).getLevel(), null);
    }
    if (logger.isDebugEnabled()) {
      logger.debug("Removed alert listener for member {}", member);
    }
  }

  return memberWasFound;
}

public static LoggerConfig getOrCreateLoggerConfig(String name) {
  LoggerContext context = (LoggerContext) LogManager.getContext(false);
  Configuration config = context.getConfiguration();
  LoggerConfig logConfig = config.getLoggerConfig(name);
  boolean update = false;
  if (!logConfig.getName().equals(name)) {
    List<AppenderRef> appenderRefs = logConfig.getAppenderRefs();
    Map<Property, Boolean> properties = logConfig.getProperties();
    Set<Property> props = properties == null ? null : properties.keySet();
    logConfig = LoggerConfig.createLogger(String.valueOf(logConfig.isAdditive()),
        logConfig.getLevel(), name, String.valueOf(logConfig.isIncludeLocation()),
        appenderRefs == null ? null : appenderRefs.toArray(new AppenderRef[appenderRefs.size()]),
        props == null ? null : props.toArray(new Property[props.size()]), config, null);
    config.addLogger(name, logConfig);
    update = true;
  }
  if (update) {
    context.updateLoggers();
  }
  return logConfig;
}

public static LoggerConfig getOrCreateLoggerConfig(String name, boolean additive,
    boolean forceAdditivity) {
  LoggerContext context = (LoggerContext) LogManager.getContext(false);
  Configuration config = context.getConfiguration();
  LoggerConfig logConfig = config.getLoggerConfig(name);
  boolean update = false;
  if (!logConfig.getName().equals(name)) {
    List<AppenderRef> appenderRefs = logConfig.getAppenderRefs();
    Map<Property, Boolean> properties = logConfig.getProperties();
    Set<Property> props = properties == null ? null : properties.keySet();
    logConfig = LoggerConfig.createLogger(String.valueOf(additive), logConfig.getLevel(), name,
        String.valueOf(logConfig.isIncludeLocation()),
        appenderRefs == null ? null : appenderRefs.toArray(new AppenderRef[appenderRefs.size()]),
        props == null ? null : props.toArray(new Property[props.size()]), config, null);
    config.addLogger(name, logConfig);
    update = true;
  }
  if (forceAdditivity && logConfig.isAdditive() != additive) {
    logConfig.setAdditive(additive);
    update = true;
  }
  if (update) {
    context.updateLoggers();
  }
  return logConfig;
}

public static boolean hasLoggerFilter(final Configuration config) {
  for (LoggerConfig loggerConfig : config.getLoggers().values()) {
    boolean isRoot = loggerConfig.getName().equals("");
    boolean isGemFire = loggerConfig.getName().startsWith(LogService.BASE_LOGGER_NAME);
    boolean hasFilter = loggerConfig.hasFilter();
    boolean isGemFireVerboseFilter =
        hasFilter && (LogService.GEODE_VERBOSE_FILTER.equals(loggerConfig.getFilter().toString())
            || LogService.GEMFIRE_VERBOSE_FILTER.equals(loggerConfig.getFilter().toString()));

    if (isRoot || isGemFire) {
      // check for Logger Filter
      if (hasFilter && !isGemFireVerboseFilter) {
        return true;
      }
    }
  }
  return false;
}

public static boolean hasAppenderRefFilter(final Configuration config) {
  for (LoggerConfig loggerConfig : config.getLoggers().values()) {
    boolean isRoot = loggerConfig.getName().equals("");
    boolean isGemFire = loggerConfig.getName().startsWith(LogService.BASE_LOGGER_NAME);

    if (isRoot || isGemFire) {
      // check for AppenderRef Filter
      for (AppenderRef appenderRef : loggerConfig.getAppenderRefs()) {
        if (appenderRef.getFilter() != null) {
          return true;
        }
      }
    }
  }
  return false;
}

/**
 * Add an appender to Log4j which sends all INFO+ messages to a separate file which will be used
 * later to scan for suspect strings. The pattern of the messages conforms to the original log
 * format so that hydra will be able to parse them.
 */
private static void addSuspectFileAppender(final String workspaceDir) {
  final String suspectFilename = new File(workspaceDir, SUSPECT_FILENAME).getAbsolutePath();

  final LoggerContext appenderContext =
      ((org.apache.logging.log4j.core.Logger) LogManager.getLogger(LogService.BASE_LOGGER_NAME))
          .getContext();

  final PatternLayout layout = PatternLayout.createLayout(
      "[%level{lowerCase=true} %date{yyyy/MM/dd HH:mm:ss.SSS z} <%thread> tid=%tid] %message%n%throwable%n",
      null, null, null, Charset.defaultCharset(), true, false, "", "");

  final FileAppender fileAppender = FileAppender.createAppender(suspectFilename, "true", "false",
      DUnitLauncher.class.getName(), "true", "false", "false", "0", layout, null, null, null,
      appenderContext.getConfiguration());
  fileAppender.start();

  LoggerConfig loggerConfig =
      appenderContext.getConfiguration().getLoggerConfig(LogService.BASE_LOGGER_NAME);
  loggerConfig.addAppender(fileAppender, Level.INFO, null);
}

@Override
public void applyDelegate(Config config) {
    Security.addProvider(new BouncyCastleProvider());
    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    Configuration ctxConfig = ctx.getConfiguration();
    LoggerConfig loggerConfig = ctxConfig.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
    if (isDebug()) {
        loggerConfig.setLevel(Level.DEBUG);
    } else if (isQuiet()) {
        loggerConfig.setLevel(Level.OFF);
    } else if (getLogLevel() != null) {
        loggerConfig.setLevel(getLogLevel());
    }
    ctx.updateLoggers();
    LOGGER.debug("Using the following security providers");
    for (Provider p : Security.getProviders()) {
        LOGGER.debug("Provider {}, version, {}", p.getName(), p.getVersion());
    }

    // remove stupid Oracle JDK security restriction (otherwise, it is not
    // possible to use strong crypto with Oracle JDK)
    UnlimitedStrengthEnabler.enable();
}

private static void addFileAppender() throws IOException {
  final String tempDir = System.getProperty("java.io.tmpdir");
  final File logFile = new File(tempDir, "meghanada_server.log");
  final LoggerContext context = (LoggerContext) LogManager.getContext(false);
  final Configuration configuration = context.getConfiguration();
  final LoggerConfig loggerConfig = configuration.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
  final FileAppender fileAppender =
      FileAppender.newBuilder()
          .withName("file")
          .withLayout(
              PatternLayout.newBuilder()
                  .withPattern("[%d][%-5.-5p][%-14.-14c{1}:%4L] %-22.-22M - %m%n")
                  .build())
          .withFileName(logFile.getCanonicalPath())
          .build();
  configuration.addAppender(fileAppender);
  loggerConfig.addAppender(fileAppender, Level.ERROR, null);
  context.updateLoggers();
}

/**
 * Constructor to create the default configuration.
 */
public StandaloneLoggerConfiguration(ConfigurationSource source) {
    super(source);

    setName(CONFIG_NAME);
    final Appender appender = StandaloneLogEventAppender.createAppender("StandaloneLogAppender", 1000);
    appender.start();
    addAppender(appender);
    final LoggerConfig root = getRootLogger();
    root.addAppender(appender, null, null);

    final String levelName = PropertiesUtil.getProperties().getStringProperty(DEFAULT_LEVEL);
    final Level level = levelName != null && Level.valueOf(levelName) != null ?
            Level.valueOf(levelName) : Level.ALL;
    root.setLevel(level);
}

protected void configureLogging() {
    final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    final Configuration config = ctx.getConfiguration();
    Layout layout = PatternLayout.createLayout(PatternLayout.SIMPLE_CONVERSION_PATTERN, null, config, null, null,
            true, false, null, null);
    Appender appender = FileAppender.createAppender(workDir + "/logs/camel-standalone.log", "false", "false", "File", "true",
            "false", "false", "4000", layout, null, "false", null, config);
    appender.start();
    config.addAppender(appender);
    AppenderRef ref = AppenderRef.createAppenderRef("File", null, null);
    AppenderRef[] refs = new AppenderRef[] {ref};
    LoggerConfig loggerConfig = LoggerConfig.createLogger("false", Level.INFO, "StandaloneFileLoggerConfig",
            "true", refs, null, config, null );
    loggerConfig.addAppender(appender, null, null);
    config.addLogger("StandaloneFileLoggerConfig", loggerConfig);
    ctx.updateLoggers();
}

private static Logger configureLog4j() {
    LoggerContext context = (LoggerContext) LogManager.getContext();
    Configuration config = context.getConfiguration();

    PatternLayout layout = PatternLayout.createLayout("%m%n", null, null, Charset.defaultCharset(), false, false, null, null);
    Appender appender = ConsoleAppender.createAppender(layout, null, null, "CONSOLE_APPENDER", null, null);
    appender.start();
    AppenderRef ref = AppenderRef.createAppenderRef("CONSOLE_APPENDER", null, null);
    AppenderRef[] refs = new AppenderRef[]{ref};
    LoggerConfig loggerConfig = LoggerConfig.createLogger("false", Level.INFO, "CONSOLE_LOGGER", "com", refs, null, null, null);
    loggerConfig.addAppender(appender, null, null);

    config.addAppender(appender);
    config.addLogger("Main.class", loggerConfig);
    context.updateLoggers(config);
    return LogManager.getContext().getLogger("Main.class");
}

private static Logger configureLog4j() {
    LoggerContext context = (LoggerContext) LogManager.getContext();
    Configuration config = context.getConfiguration();

    PatternLayout layout = PatternLayout.createLayout("%m%n", null, null, Charset.defaultCharset(), false, false, null, null);
    Appender appender = ConsoleAppender.createAppender(layout, null, null, "CONSOLE_APPENDER", null, null);
    appender.start();
    AppenderRef ref = AppenderRef.createAppenderRef("CONSOLE_APPENDER", null, null);
    AppenderRef[] refs = new AppenderRef[]{ref};
    LoggerConfig loggerConfig = LoggerConfig.createLogger("false", Level.INFO, "CONSOLE_LOGGER", "com", refs, null, null, null);
    loggerConfig.addAppender(appender, null, null);

    config.addAppender(appender);
    config.addLogger("Main.class", loggerConfig);
    context.updateLoggers(config);
    return LogManager.getContext().getLogger("Main.class");
}

/**
 * Tests that {@link oc.io.base.DecoupledInputStream#read()} terminates
 * normally when IOException is thrown in wrapped InputStream
 * 
 * @throws IOException
 */
@Test
public void testReadException() throws IOException {
    final byte b[] = new byte[1];

    // Temporary disable logging for avoiding annoying Exception trace
    final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    final Configuration config = ctx.getConfiguration();
    final LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
    final Level currentLevel = loggerConfig.getLevel();
    loggerConfig.setLevel(Level.FATAL);
    ctx.updateLoggers();

    final TestInputStream testInputStream = new TestInputStream(new IOException(
            "This exception is thrown due to a test scenario. This is expected behaviour"));
    final DecoupledInputStream decInputStream = new DecoupledInputStream(testInputStream);
    assertEquals(-1, decInputStream.read(b));
    decInputStream.close();

    loggerConfig.setLevel(currentLevel);
    ctx.updateLoggers();
}

public static void bindLogger() {
    LoggerContext context = (LoggerContext) LogManager.getContext(false);
    Configuration config = context.getConfiguration();

    Map<String, ESLogger> loggers = Maps.newConcurrentHashMap();
    Appender appender = new AbstractAppender("", null, null) {
        @Override
        public void append(LogEvent event) {
            String name = event.getLoggerName();
            ESLogger logger = loggers.computeIfAbsent(name, key -> new ESLogger(key, null, (LoggerImpl) LoggerFactory.getLogger(key)));
            logger.log(event.getLevel(), event.getMarker(), event.getMessage(), event.getThrown());
        }
    };
    appender.start();
    config.addAppender(appender);

    LoggerConfig loggerConfig = new LoggerConfig("", Level.ALL, false);
    loggerConfig.addAppender(appender, null, null);
    config.addLogger("", loggerConfig);
    context.updateLoggers();
}

/**
 * Ctor. The configuration is built using instance of
 * {@link Spec}:
 * 
 * <ul>
 * <li>The name is set to {@link Spec#getName()}.
 * <li>Appenders from the parent object are cleared.
 * <li>{@link Appender}s are created
 * {@link #buildAppenders(Spec)}.
 * <li>{@link LoggerConfig}s are created using
 * {@link #buildLoggerConfigs(Spec)}.
 * <li>Every {@link LoggerConfig} is configured with its
 * {@link Appender} using
 * {@link #configureLoggerAppenders(Spec, Map, Map)}.
 * <li>Root loggers are configured.
 * </ul>
 * 
 * @param spec
 */
EmbeddedConfiguration(Spec spec) {
  super(ConfigurationSource.NULL_SOURCE);
  setName(spec.getName());

  // Clean up first
  getAppenders().clear();
  getRootLogger().getAppenders().clear();

  // Build Appenders
  final Map<String, Appender> appenders = buildAppenders(spec);
  final Map<String, SyslogAppender> syslogAppenders = buildSyslogAppenders(spec);

  // Build Logger Configs
  final Map<String, LoggerConfig> loggers = buildLoggerConfigs(spec);

  // Configure loggers with appenders
  configureLoggerAppenders(spec, appenders, loggers);

  // Configure root logger appenders
  configureRootLogger(spec, appenders, syslogAppenders);
}

public static void main(String[] args) throws UnRetriableException{

        LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
        AbstractConfiguration config = (AbstractConfiguration) ctx.getConfiguration();
        ConsoleAppender appender = ConsoleAppender.createDefaultAppenderForLayout(PatternLayout.createDefaultLayout());
        appender.start();
        config.addAppender(appender);
        AppenderRef[] refs = new AppenderRef[] { AppenderRef.createAppenderRef(appender.getName(), null, null) };
        LoggerConfig loggerConfig = LoggerConfig.createLogger("false", Level.INFO, LogManager.ROOT_LOGGER_NAME, "true", refs, null, config, null);
        loggerConfig.addAppender(appender, null, null);
        config.addLogger(LogManager.ROOT_LOGGER_NAME, loggerConfig);
        ctx.updateLoggers();


        Runner runner = defaultRunner();
        runner.init();
        runner.start();

    }

public static void main(String[] args) throws UnRetriableException {


        LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
        AbstractConfiguration config = (AbstractConfiguration) ctx.getConfiguration();
        ConsoleAppender appender = ConsoleAppender.createDefaultAppenderForLayout(PatternLayout.createDefaultLayout());
        appender.start();
        config.addAppender(appender);
        AppenderRef[] refs = new AppenderRef[] { AppenderRef.createAppenderRef(appender.getName(), null, null) };
        LoggerConfig loggerConfig = LoggerConfig.createLogger("false", Level.WARN, LogManager.ROOT_LOGGER_NAME, "true", refs, null, config, null);
        loggerConfig.addAppender(appender, null, null);
        config.addLogger(LogManager.ROOT_LOGGER_NAME, loggerConfig);
        ctx.updateLoggers();


        Runner runner = defaultRunner();
        runner.init();
        runner.start();

    }

@Override
public void setLogLevel(String category, String level) {
  LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
  LoggerConfig loggerConfig = getLoggerConfig(ctx, category);
  if (loggerConfig != null) {
    boolean madeChanges = false;
    if (level == null || "unset".equals(level) || "null".equals(level)) {
      level = Level.OFF.toString();
      loggerConfig.setLevel(Level.OFF);
      madeChanges = true;
    } else {
      try {
        loggerConfig.setLevel(Level.valueOf(level));
        madeChanges = true;
      } catch (IllegalArgumentException iae) {
        watcherLog.error(level+" is not a valid log level! Valid values are: "+getAllLevels());
      }
    }
    if (madeChanges) {
      ctx.updateLoggers();
      watcherLog.info("Set log level to '" + level + "' for category: " + category);
    }
  } else {
    watcherLog.warn("Cannot set level to '" + level + "' for category: " + category + "; no LoggerConfig found!");
  }
}

@Override
public void registerListener(ListenerConfig cfg) {
  if (history != null)
    throw new IllegalStateException("History already registered");

  history = new CircularList<LogEvent>(cfg.size);

  Level threshold = (cfg.threshold != null) ? Level.toLevel(cfg.threshold) : Level.WARN;
  ThresholdFilter filter = ThresholdFilter.createFilter(threshold, Filter.Result.ACCEPT, Filter.Result.DENY);
  appender = new Log4j2Appender(this, filter, threshold);
  if (!appender.isStarted())
    appender.start();

  LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
  LoggerConfig config = getLoggerConfig(ctx, LoggerInfo.ROOT_NAME);
  config.addAppender(appender, threshold, filter);
  ctx.updateLoggers();
}

@Before
public void setUpAppender() throws IOException {
    file = folder.newFile();

    final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    final Configuration config = ctx.getConfiguration();
    final LoggerConfig root = ((AbstractConfiguration) config).getRootLogger();

    PatternLayout layout = PatternLayout.createLayout("[%p] %m%n", config, null, null, true, false, null, null);
    FileAppender appender = FileAppender.createAppender(file.getAbsolutePath(), "true", "false", "TestLogFile", "true", "false", "false", "8192", layout, null, "false", null, config);

    appender.start();
    config.addAppender(appender);

    root.addAppender(appender, null, null);
    ctx.updateLoggers();
}

private void setupLogging() {
    Level level = Level.getLevel(logLevel.name());
    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    Configuration config = ctx.getConfiguration();
    // Setup the root logger to the requested log level
    LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
    loggerConfig.setLevel(level);
    // Dump the requests/responses when requested
    if (logRequests) {
        loggerConfig = config.getLoggerConfig("org.apache.cxf.services");
        if (level.isLessSpecificThan(Level.INFO)) {
            loggerConfig.setLevel(level);
        } else {
            loggerConfig.setLevel(Level.INFO);
        }
    }
    ctx.updateLoggers();
}

/**
 * <p>
 * This method loads the required properties into log4j for the logger
 * </p>
 * 
 * @param logFileDir
 *            Log file directory
 * @param taskAttemptID
 *            The task attempt id
 * 
 * @throws IOException
 *             If any error occurs
 * @throws URISyntaxException
 * @throws SAXException
 * @throws ParserConfigurationException
 * @throws TransformerException
 */
public static void loadLogger(String logFileDir, String taskAttemptID) throws IOException, URISyntaxException, ParserConfigurationException,
        SAXException, TransformerException {
    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    ctx.reconfigure();
       Configuration config = ctx.getConfiguration();
       MemoryMappedFileAppender memoryMappedfileAppender = createMemoryMappedFileAppender(config, LOG_APPENDER_NAME + taskAttemptID, logFileDir, taskAttemptID, 0);
       memoryMappedfileAppender.start();
    AppenderRef[] ar = new AppenderRef [1];
       ar[0] = AppenderRef.createAppenderRef(LOG_APPENDER_NAME + taskAttemptID , Level.INFO, null);
       LoggerConfig lgf = LoggerConfig.createLogger("false",Level.INFO , LOG_CATEGORY + taskAttemptID , null, ar, null, config, null);
       config.addLogger(LOG_CATEGORY + taskAttemptID, lgf);
       ctx.getLogger(LOG_CATEGORY + taskAttemptID).addAppender(memoryMappedfileAppender);
       ctx.updateLoggers();
       ctx.start();
    mapReduceLoggers = new ArrayList<Logger>(1);
    mapReduceLoggers.add(LogManager.getLogger(LOG_CATEGORY + taskAttemptID));
    LOG.debug("Finished loading logger");

}

public void addAppenderToContext(
        final LoggerContext ctx,
        final AuditAppender auditAppender,
        final LoggerConfig eventLogConf) {

    Appender targetAppender = ctx.getConfiguration().getAppender(auditAppender.getTargetAppenderName());
    if (targetAppender == null) {
        targetAppender = auditAppender.getTargetAppender();
    }
    targetAppender.start();
    ctx.getConfiguration().addAppender(targetAppender);
    if (auditAppender.isRewriteEnabled()) {
        RewriteAppender rewriteAppender = ctx.getConfiguration().getAppender(auditAppender.
                getTargetAppenderName() + "_rewrite");
        if (rewriteAppender == null) {
            rewriteAppender = auditAppender.getRewriteAppender();
        }
        rewriteAppender.start();
        ctx.getConfiguration().addAppender(rewriteAppender);
        eventLogConf.addAppender(rewriteAppender, Level.DEBUG, null);
    } else {
        eventLogConf.addAppender(targetAppender, Level.DEBUG, null);
    }
}

public static void setLevel(Level level) {
    LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    Configuration config = ctx.getConfiguration();
    LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME); 
    loggerConfig.setLevel(level);
    ctx.updateLoggers();
        if (level == Level.ERROR) {
            logger.error("<- This level is successfully initialized");
        }
        if (level == Level.WARN) {
            logger.warn("<- This level is successfully initialized");
        }
        if (level == Level.DEBUG) {
            logger.debug("<- This level is successfully initialized");
        }
        if (level == Level.INFO) {
            logger.info("<- This level is successfully initialized");
        }
}

public static void addFileAppender(final String loggerPath, final File logFile, final AppConfig appConfig)
    throws IOException
{
    // retrieve the logger context
    LoggerContext loggerContext = (LoggerContext) LogManager.getContext(false);
    Configuration configuration = loggerContext.getConfiguration();

    // retrieve the root logger config
    LoggerConfig loggerConfig = configuration.getLoggerConfig(loggerPath);
    loggerConfig.setLevel(Level.toLevel(appConfig.getTcLogLevel()));

    // Define log pattern layout
    PatternLayout layout = PatternLayout.createLayout(DEFAULT_LOGGER_PATTERN, null, null, null,
        Charset.defaultCharset(), false, false, null, null);

    // create the appenders
    FileAppender fileAppender =
        FileAppender.createAppender(logFile.getAbsolutePath(), "true", "false", "fileAppender",
            "true", "true", "true", "8192", layout, null, "false", null, null);
    fileAppender.start();

    // add the appenders
    loggerConfig.addAppender(fileAppender, Level.toLevel(appConfig.getTcLogLevel()), null);
    loggerContext.updateLoggers();
}

public static void addServerAppender(final String loggerPath, final AppConfig appConfig)
    throws IOException
{
    // retrieve the logger context
    LoggerContext loggerContext = (LoggerContext) LogManager.getContext(false);
    Configuration configuration = loggerContext.getConfiguration();

    // retrieve the root logger config
    LoggerConfig loggerConfig = configuration.getLoggerConfig(loggerPath);
    loggerConfig.setLevel(Level.toLevel(appConfig.getTcLogLevel()));

    // create the appenders
    ServerLoggerAppender serverLoggerAppender = ServerLoggerAppender.createAppender("serverLoggerAppender");
    serverLoggerAppender.start();

    // add the appenders
    loggerConfig.addAppender(serverLoggerAppender, Level.toLevel(appConfig.getTcLogLevel()), null);
    loggerContext.updateLoggers();
}

public static void main(String[] args) throws Exception{

        LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
        Configuration config = ctx.getConfiguration();
        LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
        loggerConfig.setLevel(Level.DEBUG);
        ctx.updateLoggers();

        MultiLabelClfDataSet dataSet = TRECFormat.loadMultiLabelClfDataSet(new File(DATASETS, "scene/train"),
                DataSetType.ML_CLF_DENSE, true);
        MultiLabelClfDataSet testSet = TRECFormat.loadMultiLabelClfDataSet(new File(DATASETS, "scene/test"),
                DataSetType.ML_CLF_DENSE, true);
        AugmentedLR augmentedLR = new AugmentedLR(dataSet.getNumFeatures(), 1);
        double[][] gammas = new double[dataSet.getNumDataPoints()][1];
        for (int i=0;i<dataSet.getNumDataPoints();i++){
            gammas[i][0]=1;
        }
        AugmentedLRLoss loss = new AugmentedLRLoss(dataSet, 0, gammas, augmentedLR, 1, 1);
        LBFGS lbfgs = new LBFGS(loss);

        for (int i=0;i<100;i++){
            lbfgs.iterate();
            System.out.println(loss.getValue());
        }

    }

/**
 * Create a Loggers object to contain all the Loggers.
 * @param loggers An array of Loggers.
 * @return A Loggers object.
 */
@PluginFactory
public static Loggers createLoggers(@PluginElement("Loggers") final LoggerConfig[] loggers) {
    final ConcurrentMap<String, LoggerConfig> loggerMap = new ConcurrentHashMap<String, LoggerConfig>();
    LoggerConfig root = null;

    for (final LoggerConfig logger : loggers) {
        if (logger != null) {
            if (logger.getName().isEmpty()) {
                root = logger;
            }
            loggerMap.put(logger.getName(), logger);
        }
    }

    return new Loggers(loggerMap, root);
}

@PluginFactory
public static LoggerConfig createLogger(
        @PluginAttribute("additivity") final String additivity,
        @PluginAttribute("level") final String levelName,
        @PluginAttribute("includeLocation") final String includeLocation,
        @PluginElement("AppenderRef") final AppenderRef[] refs,
        @PluginElement("Properties") final Property[] properties,
        @PluginConfiguration final Configuration config,
        @PluginElement("Filters") final Filter filter) {
    final List<AppenderRef> appenderRefs = Arrays.asList(refs);
    Level level;
    try {
        level = Level.toLevel(levelName, Level.ERROR);
    } catch (final Exception ex) {
        LOGGER.error(
                "Invalid Log level specified: {}. Defaulting to Error",
                levelName);
        level = Level.ERROR;
    }
    final boolean additive = Booleans.parseBoolean(additivity, true);

    return new AsyncLoggerConfig(LogManager.ROOT_LOGGER_NAME,
            appenderRefs, filter, level, additive, properties, config,
            includeLocation(includeLocation));
}

@Test
public void resetLevel() {
    logger.entry();
    List<LogEvent> events = app.getEvents();
    assertTrue("Incorrect number of events. Expected 1, actual " + events.size(), events.size() == 1);
    app.clear();
    final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
    final Configuration config = ctx.getConfiguration();
    final LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
    /* You could also specify the actual logger name as below and it will return the LoggerConfig used by the Logger.
       LoggerConfig loggerConfig = getLoggerConfig("com.apache.test");
    */
    loggerConfig.setLevel(Level.DEBUG);
    ctx.updateLoggers();  // This causes all Loggers to refetch information from their LoggerConfig.
    logger.entry();
    events = app.getEvents();
    assertTrue("Incorrect number of events. Expected 0, actual " + events.size(), events.size() == 0);
    app.clear();
}

/**
 * Constructor to create the default configuration.
 */
public CustomConfiguration(final LoggerContext loggerContext, final ConfigurationSource source) {
    super(loggerContext, source);

    setName(CONFIG_NAME);
    final Layout<? extends Serializable> layout = PatternLayout.newBuilder()
            .withPattern(DEFAULT_PATTERN)
            .withConfiguration(this)
            .build();
    final Appender appender = ConsoleAppender.createDefaultAppenderForLayout(layout);
    appender.start();
    addAppender(appender);
    final LoggerConfig root = getRootLogger();
    root.addAppender(appender, null, null);

    final String levelName = PropertiesUtil.getProperties().getStringProperty(DEFAULT_LEVEL);
    final Level level = levelName != null && Level.valueOf(levelName) != null ?
            Level.valueOf(levelName) : Level.ERROR;
    root.setLevel(level);
}

private static void registerLoggerConfigs(final LoggerContext ctx, final MBeanServer mbs, final Executor executor)
        throws InstanceAlreadyExistsException, MBeanRegistrationException, NotCompliantMBeanException {

    final Map<String, LoggerConfig> map = ctx.getConfiguration().getLoggers();
    for (final String name : map.keySet()) {
        final LoggerConfig cfg = map.get(name);
        final LoggerConfigAdmin mbean = new LoggerConfigAdmin(ctx, cfg);
        register(mbs, mbean, mbean.getObjectName());

        if (cfg instanceof AsyncLoggerConfig) {
            final AsyncLoggerConfig async = (AsyncLoggerConfig) cfg;
            final RingBufferAdmin rbmbean = async.createRingBufferAdmin(ctx.getName());
            register(mbs, rbmbean, rbmbean.getObjectName());
        }
    }
}

@PluginFactory
public static LoggerConfig createLogger(
        @PluginAttribute("additivity") final String additivity,
        @PluginAttribute("level") final String levelName,
        @PluginAttribute("includeLocation") final String includeLocation,
        @PluginElement("AppenderRef") final AppenderRef[] refs,
        @PluginElement("Properties") final Property[] properties,
        @PluginConfiguration final Configuration config,
        @PluginElement("Filter") final Filter filter) {
    final List<AppenderRef> appenderRefs = Arrays.asList(refs);
    Level level;
    try {
        level = Level.toLevel(levelName, Level.ERROR);
    } catch (final Exception ex) {
        LOGGER.error(
                "Invalid Log level specified: {}. Defaulting to Error",
                levelName);
        level = Level.ERROR;
    }
    final boolean additive = Booleans.parseBoolean(additivity, true);

    return new AsyncLoggerConfig(LogManager.ROOT_LOGGER_NAME,
            appenderRefs, filter, level, additive, properties, config,
            AsyncLoggerConfig.includeLocation(includeLocation));
}

@Test
public void resetLevel() {
    final org.apache.logging.log4j.Logger logger = context.getLogger("com.apache.test");
    logger.traceEntry();
    List<LogEvent> events = app.getEvents();
    assertEquals("Incorrect number of events. Expected 1, actual " + events.size(), 1, events.size());
    app.clear();
    final LoggerContext ctx = LoggerContext.getContext(false);
    final Configuration config = ctx.getConfiguration();
    final LoggerConfig loggerConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME);
    /* You could also specify the actual logger name as below and it will return the LoggerConfig used by the Logger.
       LoggerConfig loggerConfig = getLoggerConfig("com.apache.test");
    */
    loggerConfig.setLevel(Level.DEBUG);
    ctx.updateLoggers();  // This causes all Loggers to refetch information from their LoggerConfig.
    logger.traceEntry();
    events = app.getEvents();
    assertEquals("Incorrect number of events. Expected 0, actual " + events.size(), 0, events.size());
}

@Override
public Statement apply(final Statement base, final Description description) {
    return new Statement() {
        @Override
        public void evaluate() throws Throwable {
            System.setProperty(Constants.LOG4J_LOG_EVENT_FACTORY, TestLogEventFactory.class.getName());
            resetLogEventFactory(new TestLogEventFactory());
            try {
                base.evaluate();
            } finally {
                System.clearProperty(Constants.LOG4J_LOG_EVENT_FACTORY);
                resetLogEventFactory(new DefaultLogEventFactory());
            }
        }

        private void resetLogEventFactory(final LogEventFactory logEventFactory) throws IllegalAccessException {
            final Field field = FieldUtils.getField(LoggerConfig.class, "LOG_EVENT_FACTORY", true);
            FieldUtils.removeFinalModifier(field, true);
            FieldUtils.writeStaticField(field, logEventFactory, false);
        }
    };
}

@Test
public void testPropertiesConfiguration() {
    final Configuration config = context.getConfiguration();
    assertNotNull("No configuration created", config);
    assertEquals("Incorrect State: " + config.getState(), config.getState(), LifeCycle.State.STARTED);
    final Map<String, Appender> appenders = config.getAppenders();
    assertNotNull(appenders);
    assertTrue("Incorrect number of Appenders: " + appenders.size(), appenders.size() == 1);
    final Map<String, LoggerConfig> loggers = config.getLoggers();
    assertNotNull(loggers);
    assertTrue("Incorrect number of LoggerConfigs: " + loggers.size(), loggers.size() == 2);
    final Filter filter = config.getFilter();
    assertNotNull("No Filter", filter);
    assertTrue("Not a Threshold Filter", filter instanceof ThresholdFilter);
    final Logger logger = LogManager.getLogger(getClass());
    logger.info("Welcome to Log4j!");
}