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KoPeMe performance testing core

There is a newer version: 1.4.1

package de.dagere.kopeme.datacollection;

import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * A collector for the CPU usage during a test.
 * 
 * @author reichelt
 *
 */
public final class CPUUsageCollector extends DataCollector {

   private static final int MULTIPLICATOR_FOR_READABILITY = 1000;

   private static final Logger LOG = LogManager.getLogger(CPUUsageCollector.class);

   private long startTimeCpu = 0, stopTimeCpu = 0;
   private long startTimeUser = 0, stopTimeUser = 0;
   private long startTime = 0, stopTime = 0;
   private ThreadMXBean mxb;

   @Override
   public int getPriority() {
      return LOW_DATACOLLECTOR_PRIORITY;
   }

   @Override
   public void startCollection() {
      mxb = ManagementFactory.getThreadMXBean();
      startTimeCpu = mxb.getCurrentThreadCpuTime();
      startTimeUser = mxb.getCurrentThreadUserTime();
      startTime = System.nanoTime();
   }

   @Override
   public void stopCollection() {
      stopTimeCpu = mxb.getCurrentThreadCpuTime();
      stopTimeUser = mxb.getCurrentThreadUserTime();
      stopTime = System.nanoTime();
   }

   @Override
   public long getValue() {
      long cpuTime = stopTimeCpu - startTimeCpu;
      long time = stopTime - startTime;
      LOG.trace("CPUTime: " + cpuTime + " Usertime: " + (stopTimeUser - startTimeUser));
      if (!mxb.isCurrentThreadCpuTimeSupported())
         return -1;
      return (MULTIPLICATOR_FOR_READABILITY * cpuTime) / time;

   }
}