TestUnifiedLoggingSwitchStress.java 文件源码

@Override
public void run() {

    while (!shouldStop) {
        int fileNum = RND.nextInt(logCount);
        int logLevel = RND.nextInt(LOG_LEVELS.length);

        String outputCommand = String.format("output=%s_%d.log", logFilePrefix, fileNum);
        String logLevelCommand = "what='gc*=" + LOG_LEVELS[logLevel] + "'";

        try {
            Object out = MBS.invoke(new ObjectName("com.sun.management:type=DiagnosticCommand"),
                                    "vmLog",
                                    new Object[]{new String[]{outputCommand, logLevelCommand}},
                                    new String[]{String[].class.getName()});

            if (!out.toString().isEmpty()) {
                System.out.format("WARNING: Diagnostic command vmLog with arguments %s,%s returned not empty"
                                + " output %s\n",
                        outputCommand, logLevelCommand, out);
            }
        } catch (InstanceNotFoundException | MBeanException | ReflectionException | MalformedObjectNameException e) {
            System.out.println("Got exception trying to change log level:" + e);
            e.printStackTrace();
            throw new Error(e);
        }
        Thread.yield();
    }
    System.out.println("Log Switcher finished");
}