org.webswing.toolkit.util.CpuMonitor Maven / Gradle / Ivy
package org.webswing.toolkit.util;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.reflect.Method;
import java.util.concurrent.TimeUnit;
public class CpuMonitor {
static long previousCPUTime = 0;
static long previousTime = 0;
static Method getProcessCpuTimeMethod;
static {
try {
Class osMXBeanClass = Class.forName("com.sun.management.OperatingSystemMXBean");
getProcessCpuTimeMethod = osMXBeanClass.getMethod("getProcessCpuTime");
}
catch(ReflectiveOperationException sun) {
try {
Class osMXBeanClass = Class.forName("com.ibm.lang.management.OperatingSystemMXBean");
getProcessCpuTimeMethod = osMXBeanClass.getMethod("getProcessCpuTime");
}
catch(ReflectiveOperationException ibm) {
getProcessCpuTimeMethod = null;
Logger.warn("Class not found to monitor CPU utilization. Monitoring CPU disabled.", sun);
}
}
}
public static double getCpuUtilization() {
if(getProcessCpuTimeMethod == null) {
return -1;
}
try {
OperatingSystemMXBean osMXBean = ManagementFactory.getOperatingSystemMXBean();
long currentCpuTime = (Long) getProcessCpuTimeMethod.invoke(osMXBean);
long now = ManagementFactory.getRuntimeMXBean().getUptime();
long cpuTimeDelta = currentCpuTime - previousCPUTime;
previousCPUTime = currentCpuTime;
long timeDelta = now - previousTime;
previousTime = now;
int processors = Runtime.getRuntime().availableProcessors();
if (timeDelta == 0 || processors == 0) {
return 0;
}
double cpuUsage = (double) TimeUnit.NANOSECONDS.toMillis(cpuTimeDelta) / (double) timeDelta;
cpuUsage = cpuUsage / processors;
return Math.max(0, cpuUsage) * 100;
} catch (ReflectiveOperationException e) {
getProcessCpuTimeMethod = null;
Logger.warn("Failed to load CPU utilization. Monitoring CPU disabled.", e);
return -1;
}
}
}