scope oshi_calcProcessCPUUsage_v2.

sclass #Data {
  long cpuTime, timestamp;
  OSProcess process;
}

// key: pid
static Map<Int, Data> #map = synchroMap();

svoid _onLoad_oshi_calcProcessCPUUsage_v2 {
  ownResource(vmBus_onMessage('osProcesses, voidfunc(L processes) {
    Set<Int> keep = asHashSet(collectMethod(processes, 'getProcessID));
    for (Iterator<Int> it = map.keySet().iterator(); it.hasNext(); ) {
      Int pid = it.next();
      if (!keep.contains(pid)) {
        Data data = map.get(pid);
        print("Lost process: [" + pid + "] " + data.process.getName());
        it.remove();
      }
    }
  }));
}

// call this in proper interval (1 to 3 seconds) to work properly
static double oshi_calcProcessCPUUsage_v2(OSProcess p) {
  if (p == null) ret 0;
  int pid = p.getProcessID();
  Data data = map.get(pid);
  if (data == null)
    map.put(pid, data = nu(Data, process := p));

  long cpuTime = p.getKernelTime() + p.getUserTime();

  double result = 0;
  long now = sysNow();
  if (data.timestamp != 0)
		result = percentRatio(cpuTime-data.cpuTime, now-data.timestamp);
  data.timestamp = now;
	data.cpuTime = cpuTime;
	ret result;
}

end scope