feat: record timestamp and duration on sensor measure

metadata/src/main/java/net/laprun/sustainability/power/SensorMeasure.java

@@ -8,9 +8,9 @@
  * @param components an array recording the power consumption reported by each component of this sensor
  * @param tick the ordinal tick associated with this measure
  */
-public record SensorMeasure(double[] components, long tick) {
+public record SensorMeasure(double[] components, long tick, long timestamp, long duration) {
     /**
      * Represents an invalid or somehow missed measure.
      */
-    public static final SensorMeasure missing = new SensorMeasure(new double[] { -1.0 }, -1);
+    public static final SensorMeasure missing = new SensorMeasure(new double[] { -1.0 }, -1, -1, -1);
 }

server/src/main/java/net/laprun/sustainability/power/sensors/linux/rapl/IntelRAPLSensor.java

@@ -133,14 +133,16 @@ public boolean isStarted() {
 
     @Override
     public Measures update(Long tick) {
+        final long start = System.currentTimeMillis();
         final var measure = new double[raplFiles.length];
         for (int i = 0; i < raplFiles.length; i++) {
             final var value = raplFiles[i].extractEnergyInMicroJoules();
             final var newComponentValue = computePowerInMilliWatt(i, value);
             measure[i] = newComponentValue;
             lastMeasuredSensorValues[i] = newComponentValue;
         }
-        measures.singleMeasure(new SensorMeasure(measure, tick));
+        final long timestamp = System.currentTimeMillis();
+        measures.singleMeasure(new SensorMeasure(measure, tick, timestamp, timestamp - start));
         return measures;
     }
 }

server/src/main/java/net/laprun/sustainability/power/sensors/macos/powermetrics/MacOSPowermetricsSensor.java

@@ -118,6 +118,7 @@ public ProcessRecord(String line) throws IllegalArgumentException {
     }
 
     Measures extractPowerMeasure(InputStream powerMeasureInput, Long tick) {
+        final long start = System.currentTimeMillis();
         try {
             // Should not be closed since it closes the process
             BufferedReader input = new BufferedReader(new InputStreamReader(powerMeasureInput));
@@ -196,7 +197,8 @@ Measures extractPowerMeasure(InputStream powerMeasureInput, Long tick) {
                     }
                 });
 
-                measures.record(pid, new SensorMeasure(measure, tick));
+                final long timestamp = System.currentTimeMillis();
+                measures.record(pid, new SensorMeasure(measure, tick, timestamp, timestamp - start));
             });
         } catch (Exception exception) {
             throw new RuntimeException(exception);

server/src/main/java/net/laprun/sustainability/power/sensors/test/TestPowerSensor.java

@@ -47,7 +47,8 @@ public void start(long samplingFrequencyInMillis) {
 
     @Override
     public Measures update(Long tick) {
-        measures.trackedPIDs().forEach(pid -> measures.record(pid, new SensorMeasure(new double[] { Math.random() }, tick)));
+        measures.trackedPIDs().forEach(pid -> measures.record(pid,
+                new SensorMeasure(new double[] { Math.random() }, tick, System.currentTimeMillis(), 0)));
         return measures;
     }
 }