package com.ajjpj.asysmon.measure.scalar;
import com.ajjpj.abase.io.AFile;
import com.ajjpj.asysmon.data.AScalarDataPoint;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Map;
/**
* @author arno
*/
public class AProcSelfStatMeasurer implements AScalarMeasurer {
public static final AFile PROC_SELF_STAT_FILE = new AFile("/proc/self/stat", Charset.defaultCharset());
public static final String KEY_MEMENTO = "proc:self:stat";
public static final String KEY_SELF_USER = ACpuUtilizationMeasurer.KEY_PREFIX + "self-user";
public static final String KEY_SELF_KERNEL = ACpuUtilizationMeasurer.KEY_PREFIX + "self-kernel";
@Override public void prepareMeasurements(Map<String, Object> mementos) throws Exception {
mementos.put(KEY_MEMENTO, createSnapshot());
}
@Override public void contributeMeasurements(Map<String, AScalarDataPoint> data, long timestamp, Map<String, Object> mementos) throws Exception {
final Snapshot prev = (Snapshot) mementos.get(KEY_MEMENTO);
final Snapshot current = createSnapshot();
final long diffTime = current.timestamp - prev.timestamp;
final long userJiffies = current.userJiffies - prev.userJiffies;
final long kernelJiffies = current.kernelJiffies - prev.kernelJiffies;
final long userPerMill = userJiffies * 10*1000 / diffTime;
final long kernelPerMill = kernelJiffies * 10*1000 / diffTime;
data.put(KEY_SELF_USER, new AScalarDataPoint(timestamp, KEY_SELF_USER, userPerMill, 1));
data.put(KEY_SELF_KERNEL, new AScalarDataPoint(timestamp, KEY_SELF_KERNEL, kernelPerMill, 1));
}
@Override public void shutdown() throws Exception {
}
private Snapshot createSnapshot() throws IOException {
final String raw = PROC_SELF_STAT_FILE.lines().get(0);
final String[] split = raw.split("\\s+");
final long userJiffies = Long.valueOf(split[13]);
final long kernelJiffies = Long.valueOf(split[14]);
return new Snapshot(userJiffies, kernelJiffies);
}
private static class Snapshot {
final long timestamp = System.currentTimeMillis();
final long userJiffies;
final long kernelJiffies;
Snapshot(long userJiffies, long kernelJiffies) {
this.userJiffies = userJiffies;
this.kernelJiffies = kernelJiffies;
}
}
}