public void level()

in core/src/main/java/com/taobao/arthas/core/command/logger/LoggerCommand.java [148:202]
49 lines of code
13 McCabe index (conditional complexity)

    public void level(CommandProcess process) {
        Instrumentation inst = process.session().getInstrumentation();
        boolean result = false;

        // 如果不指定 classloader，则默认用 SystemClassLoader
        ClassLoader classLoader = ClassLoader.getSystemClassLoader();
        if (hashCode != null) {
            classLoader = ClassLoaderUtils.getClassLoader(inst, hashCode);
            if (classLoader == null) {
                process.end(-1, "Can not find classloader by hashCode: " + hashCode + ".");
                return;
            }
        }

        LoggerTypes loggerTypes = findLoggerTypes(process.session().getInstrumentation(), classLoader);
        if (loggerTypes.contains(LoggerType.LOG4J)) {
            try {
                Boolean updateResult = this.updateLevel(inst, classLoader, Log4jHelper.class);
                if (Boolean.TRUE.equals(updateResult)) {
                    result = true;
                }
            } catch (Throwable e) {
                logger.error("logger command update log4j level error", e);
            }
        }

        if (loggerTypes.contains(LoggerType.LOGBACK)) {
            try {
                Boolean updateResult = this.updateLevel(inst, classLoader, LogbackHelper.class);
                if (Boolean.TRUE.equals(updateResult)) {
                    result = true;
                }
            } catch (Throwable e) {
                logger.error("logger command update logback level error", e);
            }
        }

        if (loggerTypes.contains(LoggerType.LOG4J2)) {
            try {
                Boolean updateResult = this.updateLevel(inst, classLoader, Log4j2Helper.class);
                if (Boolean.TRUE.equals(updateResult)) {
                    result = true;
                }
            } catch (Throwable e) {
                logger.error("logger command update log4j2 level error", e);
            }
        }

        if (result) {
            process.end(0, "Update logger level success.");
        } else {
            process.end(-1,
                    "Update logger level fail. Try to specify the classloader with the -c option. Use `sc -d CLASSNAME` to find out the classloader hashcode.");
        }
    }