public static void write(Class clazz, LogLevel logLevel, String message)
{
    switch (logLevel)
    {
        case TRACE:
            logger.trace(message);
            break;
        case DEBUG:
            logger.debug(message);
            break;
        case INFO:
            logger.info(message);
            break;
        case WARN:
            logger.warn(message);
            break;
        case ERROR:
            logger.error(message);
            break;
        default:
            logger.warn("No suitable log level found");
            break;
    }
}
 

private boolean isEnabled(org.slf4j.Logger logger, LogLevel level) {
    Objects.requireNonNull(level, "LogLevel must not be null.");
    switch (level) {
        case TRACE:
            return logger.isTraceEnabled();
        case DEBUG:
            return logger.isDebugEnabled();
        case INFO:
            return logger.isInfoEnabled();
        case WARN:
            return logger.isWarnEnabled();
        case ERROR:
        case FATAL:
            return logger.isErrorEnabled();
        default:
            throw new IllegalArgumentException("LogLevel must be one of the enabled levels.");
    }
}
 

@Override
public void validate(Method method, T target) throws AnnotationUsageException {
    LogLevel expectedLevel = AnnotationAttribute.LEVEL.extract(target);
    LogLevel ifEnabledLevel = AnnotationAttribute.IF_ENABLED.extract(target);
    if (ifEnabledLevel.ordinal() >= expectedLevel.ordinal() && ifEnabledLevel != OFF) {
        throw new AnnotationUsageException(method,
                format("'ifEnabled = %s' should be more strict than 'level = %s'", ifEnabledLevel, expectedLevel),
                "Correct specified levels relation or replace 'ifEnabled' by default value 'OFF'",
                target);
    }

    String printerName = AnnotationAttribute.PRINTER.extract(target);
    if (StringUtils.hasText(printerName)) {
        Printer printer = printerResolver.resolve(printerName);
        if (isNull(printer)) {
            throw new AnnotationUsageException(method,
                    format("Unknown printer '%s'", printerName),
                    "Use correct bean name or alias to specify 'printer'",
                    target);
        }
    }
}
 

private void log(org.slf4j.Logger logger, LogLevel level, String message, Object... args) {
    Objects.requireNonNull(level, "LogLevel must not be null.");
    switch (level) {
        case TRACE:
            logger.trace(message, args);
            break;
        case DEBUG:
            logger.debug(message, args);
            break;
        case INFO:
            logger.info(message, args);
            break;
        case WARN:
            logger.warn(message, args);
            break;
        case ERROR:
        case FATAL:
            logger.error(message, args);
            break;
        default:
            break;
    }
}
 

public void changeLogLevel(String loggerName, LogLevel level) {
	try {
		loggingSystem.setLogLevel(loggerName, level);
	} catch (Exception e) {
		// TODO: handle exception
	}
}
 

/**
 * 发布自定义日志事件
 *
 * @param level       日志级别
 * @param prefix      日志前缀
 * @param description 日志描述
 */
public static void publishCustomLogEvent(LogLevel level, String prefix, String description) {
	HttpServletRequest request = WebUtil.getRequest();
	CustomLogModel model = new CustomLogModel(level);
	model.setPrefix(prefix);
	model.setDescription(description);
	Map<String, Object> event = new HashMap<>(16);
	event.put(LogConstants.EVENT_LOG_KEY, model);
	event.put(LogConstants.EVENT_REQUEST_KEY, request);
	SpringUtil.publishEvent(new CustomLogEvent(event));
}
 

@Test
void changeDefaultROOTLogLevel() {
	var app = application(it -> it.logging(log -> log.level(LogLevel.DEBUG)));
	app.run();
	var loggingSystem = LoggingSystem.get(LoggingDslTests.class.getClassLoader());
	assertEquals(LogLevel.DEBUG, loggingSystem.getLoggerConfiguration("ROOT").getEffectiveLevel());
}
 

@Test
public void logFatalError() {
    LoggingSystem.get(ClassLoader.getSystemClassLoader())
            .setLogLevel(org.slf4j.Logger.ROOT_LOGGER_NAME, LogLevel.FATAL);
    logger.log(LogLevel.FATAL, "logger name", "fatal message", new Exception("error message"));
    Pattern pattern = Pattern.compile("ERROR logger name - fatal message.*java.lang.Exception: error message",
            Pattern.DOTALL | Pattern.MULTILINE);
    assertTrue(pattern.matcher(capture.toString()).find());
}
 

private LogLevel resolveLogLevel(String level) {
	String trimmedLevel = level.trim();
	if ("false".equalsIgnoreCase(trimmedLevel)) {
		return LogLevel.OFF;
	}
	return LogLevel.valueOf(trimmedLevel.toUpperCase(Locale.ENGLISH));
}
 

/**
 * Loggers method
 *
 * @param action      action to make
 * @param loggerName  logger name for get or configure
 * @param loggerLevel logger level for configure
 * @return loggers
 */
@ShellMethod(key = "loggers", value = "Display or configure loggers.")
@ShellMethodAvailability("loggersAvailability")
public Object loggers(
        @ShellOption(value = {"-a", "--action"}, help = "Action to perform", defaultValue = "list") LoggerAction action,
        @ShellOption(value = {"-n", "--name"}, help = "Logger name for configuration or display", defaultValue =
                ShellOption.NULL) String loggerName,
        @ShellOption(value = {"-l", "--level"}, help = "Logger level for configuration", defaultValue =
                ShellOption.NULL) LogLevel loggerLevel) {
    if ((action == LoggerAction.get || action == LoggerAction.conf) && loggerName == null) {
        throw new IllegalArgumentException("Logger name is mandatory for '" + action + "' action");
    }
    switch (action) {
        case get:
            LoggersEndpoint.LoggerLevels levels = loggers.loggerLevels(loggerName);
            return "Logger named [" + loggerName + "] : [configured: " + levels.getConfiguredLevel() + "]";
        case conf:
            if (loggerLevel == null) {
                throw new IllegalArgumentException("Logger level is mandatory for '" + action + "' action");
            }
            loggers.configureLogLevel(loggerName, loggerLevel);
            return "Logger named [" + loggerName + "] now configured to level [" + loggerLevel + "]";
        default:
            // list
            return loggers.loggers();
    }
}
 

private LoggerConfiguration getLoggerConfiguration(ch.qos.logback.classic.Logger logger) {
	if (logger == null) {
		return null;
	}
	LogLevel level = LEVELS.convertNativeToSystem(logger.getLevel());
	LogLevel effectiveLevel = LEVELS.convertNativeToSystem(logger.getEffectiveLevel());
	String name = logger.getName();
	if (!StringUtils.hasLength(name) || Logger.ROOT_LOGGER_NAME.equals(name)) {
		name = ROOT_LOGGER_NAME;
	}
	return new LoggerConfiguration(name, level, effectiveLevel);
}
 

@Override
public void setLogLevel(String loggerName, LogLevel level) {
	ch.qos.logback.classic.Logger logger = getLogger(loggerName);
	if (logger != null) {
		logger.setLevel(LEVELS.convertSystemToNative(level));
	}
}
 

@PostConstruct
private void refreshLoggingLevels() {
  Set<String> keyNames = config.getPropertyNames();
  for (String key : keyNames) {
    if (containsIgnoreCase(key, LOGGER_TAG)) {
      String strLevel = config.getProperty(key, "info");
      LogLevel level = LogLevel.valueOf(strLevel.toUpperCase());
      loggingSystem.setLogLevel(key.replace(LOGGER_TAG, ""), level);
      logger.info("{}:{}", key, strLevel);
    }
  }
}
 

private Map<String, List<LogLevel>> groupLevels(String loggerName) {
    return exampleAppender.getLoggerEvents(loggerName).entrySet().stream()
            .collect(groupingBy(
                    o -> exampleTableBuilder.buildSampleCell(o.getValue()),
                    LinkedHashMap::new,
                    mapping(identity(), toList())
            )).entrySet().stream().collect(toMap(
                    Map.Entry::getKey,
                    o -> o.getValue().stream().map(Map.Entry::getKey).collect(toList()),
                    (logLevels, logLevels2) -> {
                        throw new RuntimeException();
                    },
                    LinkedHashMap::new
            ));
}
 

private void invoke(Runnable runnable, LogLevel level) {
    loggingSystem.setLogLevel(ROOT_LOGGER_NAME, level);
    exampleAppender.setLevel(level);
    try {
        runnable.run();
    } catch (Throwable e) {
        // do nothing
    }
}
 

private String buildLevelsCell(List<LogLevel> logLevels) {
    StringBuilder payload = new StringBuilder(" ");
    payload.append(logLevels.size() > 2 ? buildCroppedLevelsCell(logLevels) : buildFullLevelsCell(logLevels));
    while (payload.length() < LEVELS_CELL_WIDTH) {
        payload.append(" ");
    }
    return payload.toString();
}
 

public static void write(Class clazz, LogLevel logLevel, String message) {
    Logger logger = LoggerFactory.getLogger(clazz);

    switch (logLevel) {
    case TRACE:
        logger.trace(message);
        break;
    case DEBUG:
        logger.debug(message);
        break;
    case INFO:
        logger.info(message);
        break;
    case WARN:
        logger.warn(message);
        break;
    case ERROR:
        logger.error(message);
        break;
    case FATAL:
        Marker marker = MarkerFactory.getMarker("FATAL");
        logger.error(marker, message);
        break;
    default:
        logger.warn("No suitable log level found");
        break;
    }
}
 

private void log(LogLevel level, String message, ProceedingJoinPoint joinPoint, Loggable loggable, Object... args) {
    if (loggable.name().isEmpty()) {
        logger.log(level, ((MethodSignature) joinPoint.getSignature()).getMethod().getDeclaringClass(), message, args);
    } else {
        logger.log(level, loggable.name(), message, args);
    }
}
 

@Test
public void logTrace() {
    LoggingSystem.get(ClassLoader.getSystemClassLoader())
            .setLogLevel(org.slf4j.Logger.ROOT_LOGGER_NAME, LogLevel.TRACE);
    logger.log(LogLevel.TRACE, "logger name", "trace message");
    assertThat(capture.toString(), containsString("TRACE logger name - trace message"));
}
 

@RequestMapping(
        value = "${edison.application.management.base-path:/internal}/loggers",
        consumes = APPLICATION_FORM_URLENCODED_VALUE,
        produces = TEXT_HTML_VALUE,
        method = POST)
public RedirectView post(@ModelAttribute("name") String name,
                         @ModelAttribute("level") String level,
                         HttpServletRequest httpServletRequest) {
    final LogLevel logLevel = level == null ? null : valueOf(level.toUpperCase());
    loggersEndpoint.configureLogLevel(name, logLevel);
    return new RedirectView(String.format("%s%s/loggers", baseUriOf(httpServletRequest), applicationProperties.getManagement().getBasePath()));
}
 

@Test
public void logTraceError() {
    LoggingSystem.get(ClassLoader.getSystemClassLoader())
            .setLogLevel(org.slf4j.Logger.ROOT_LOGGER_NAME, LogLevel.TRACE);
    logger.log(LogLevel.TRACE, "logger name", "trace message", new Exception("error message"));
    Pattern pattern = Pattern.compile("TRACE logger name - trace message.*java.lang.Exception: error message",
            Pattern.DOTALL | Pattern.MULTILINE);
    assertTrue(pattern.matcher(capture.toString()).find());
}
 

@Test
public void logErrorError() {
    LoggingSystem.get(ClassLoader.getSystemClassLoader())
            .setLogLevel(org.slf4j.Logger.ROOT_LOGGER_NAME, LogLevel.ERROR);
    logger.log(LogLevel.ERROR, "logger name", "error message", new Exception("error message"));
    Pattern pattern = Pattern.compile("ERROR logger name - error message.*java.lang.Exception: error message",
            Pattern.DOTALL | Pattern.MULTILINE);
    assertTrue(pattern.matcher(capture.toString()).find());
}
 

@Test
public void logDebug() {
    LoggingSystem.get(ClassLoader.getSystemClassLoader())
            .setLogLevel(org.slf4j.Logger.ROOT_LOGGER_NAME, LogLevel.DEBUG);
    logger.log(LogLevel.DEBUG, "logger name", "debug message");
    assertThat(capture.toString(), containsString("DEBUG logger name - debug message"));
}
 

@Test
public void logDebugError() {
    LoggingSystem.get(ClassLoader.getSystemClassLoader())
            .setLogLevel(org.slf4j.Logger.ROOT_LOGGER_NAME, LogLevel.DEBUG);
    logger.log(LogLevel.DEBUG, "logger name", "debug message", new Exception("error message"));
    Pattern pattern = Pattern.compile("DEBUG logger name - debug message.*java.lang.Exception: error message",
            Pattern.DOTALL | Pattern.MULTILINE);
    assertTrue(pattern.matcher(capture.toString()).find());
}
 

private void quiet() {
	try {
		LogbackLoggingSystem.get(ClassUtils.getDefaultClassLoader())
				.setLogLevel("ROOT", LogLevel.OFF);
	}
	catch (Exception e) {
		logger.error("Unable to turn of ROOT logger for quiet()", e);
	}
}
 

@NacosConfigListener(dataId = "${nacos.example.listener.data-id}", timeout = 5000)
public void onChange(String newLog) throws Exception {
	Properties properties = new DefaultPropertiesConfigParse().parse(newLog);
	for (Object t : properties.keySet()) {
		String key = String.valueOf(t);
		if (key.startsWith(LOGGER_TAG)) {
			String strLevel = properties.getProperty(key, "info");
			LogLevel level = LogLevel.valueOf(strLevel.toUpperCase());
			loggingSystem.setLogLevel(key.replace(LOGGER_TAG, ""), level);
			logger.info("{}:{}", key, strLevel);
		}
	}
}
 

private LogLevel coerceLogLevel(String level) {
	if ("false".equalsIgnoreCase(level)) {
		return LogLevel.OFF;
	}
	return LogLevel.valueOf(level.toUpperCase());
}
 

@Test
public void isLogFatalEnabled() {
    LoggingSystem.get(ClassLoader.getSystemClassLoader())
            .setLogLevel(org.slf4j.Logger.ROOT_LOGGER_NAME, LogLevel.FATAL);
    assertTrue(logger.isEnabled(LogLevel.FATAL, "logger name"));
}
 

public CustomLogModel(LogLevel level) {
	super(LogType.CUSTOM, level);
}
 

private boolean isLevelEnabled(ProceedingJoinPoint joinPoint, Loggable loggable) {
    return loggable.name().isEmpty()
            ? logger.isEnabled(LogLevel.WARN,
            ((MethodSignature) joinPoint.getSignature()).getMethod().getDeclaringClass())
            : logger.isEnabled(LogLevel.WARN, loggable.name());
}