Get the CPU-usage of the process calling the method #java #Mbeans #cpu #utiilities

getProcessCpuLoad.java

/* This program is free software. It comes without any warranty, to
* the extent permitted by applicable law. You can redistribute it
* and/or modify it under the terms of the Do What The Fuck You Want
* To Public License, Version 2, as published by Sam Hocevar. See
* http://www.wtfpl.net/ for more details. 
*/

public static double getProcessCpuLoad() throws MalformedObjectNameException, ReflectionException, InstanceNotFoundException {

        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
        ObjectName name = ObjectName.getInstance("java.lang:type=OperatingSystem");
        AttributeList list = mbs.getAttributes(name, new String[]{"ProcessCpuLoad"});

        if (list.isEmpty()) {
            return 0.0;
        }
        Attribute att = (Attribute) list.get(0);
        Double value = (Double) att.getValue();

        if (value < 0.0) {
            return 0.0;  // usually takes a couple of seconds before we get real values
        }
        return ((int) (value * 1000) / 10.0);        // returns a percentage value with 1 decimal point precision
    }