| 1 | package de.uka.ipd.sdq.probespec.framework.calculator; |
| 2 | |
| 3 | import java.util.Vector; |
| 4 | |
| 5 | import javax.measure.Measure; |
| 6 | import javax.measure.quantity.Duration; |
| 7 | import javax.measure.quantity.Quantity; |
| 8 | import javax.measure.unit.Unit; |
| 9 | |
| 10 | import de.uka.ipd.sdq.probespec.framework.ProbeSample; |
| 11 | import de.uka.ipd.sdq.probespec.framework.ProbeSetSample; |
| 12 | import de.uka.ipd.sdq.probespec.framework.ProbeSpecContext; |
| 13 | import de.uka.ipd.sdq.probespec.framework.ProbeType; |
| 14 | import de.uka.ipd.sdq.probespec.framework.exceptions.CalculatorException; |
| 15 | import de.uka.ipd.sdq.probespec.framework.matching.IMatchRule; |
| 16 | import de.uka.ipd.sdq.probespec.framework.matching.ProbeTypeMatchRule; |
| 17 | |
| 18 | /** |
| 19 | * Calculates the waiting time for resources in environments where the stop of |
| 20 | * the waiting period cannot be observed directly. Rather the following values |
| 21 | * (respectively events) should be observable. |
| 22 | * <ul> |
| 23 | * <li><code>start</code> - "request for processing"-event</li> |
| 24 | * <li><code>stop</code> - "end of processing"-event (Notice: This is different |
| 25 | * from the waiting period stop)</li> |
| 26 | * <li><code>demand</code> - the demanded time</li> |
| 27 | * </ul> |
| 28 | * The waiting time results from calculating |
| 29 | * <code>(stop - start) - demand </code>. |
| 30 | * |
| 31 | * @author pmerkle |
| 32 | * |
| 33 | */ |
| 34 | public class DemandBasedWaitingTimeCalculator extends WaitingTimeCalculator { |
| 35 | |
| 36 | public DemandBasedWaitingTimeCalculator(ProbeSpecContext ctx, Integer startWaitingProbeSetID, |
| 37 | Integer stopProcessingProbeSetID) { |
| 38 | super(ctx, startWaitingProbeSetID, stopProcessingProbeSetID); |
| 39 | } |
| 40 | |
| 41 | @SuppressWarnings("unchecked") |
| 42 | @Override |
| 43 | protected Vector<Measure<?, ? extends Quantity>> calculate( |
| 44 | ProbeSetSample start, ProbeSetSample end) |
| 45 | throws CalculatorException { |
| 46 | // Obtain demand. The demand of start and end should be equal! |
| 47 | ProbeSample<Double, Duration> demandSample = obtainDemandProbeSample(start); |
| 48 | if (demandSample == null) { |
| 49 | throw new CalculatorException( |
| 50 | "Could not access demand probe sample."); |
| 51 | } |
| 52 | |
| 53 | // Obtain processing time |
| 54 | Vector<Measure<?, ? extends Quantity>> timeSpanResultTuple = super |
| 55 | .calculate(start, end); |
| 56 | Measure<Double, Duration> processingTimeSpanMeasure = (Measure<Double, Duration>) timeSpanResultTuple |
| 57 | .get(0); |
| 58 | Measure<Double, Duration> endTimeMeasure = (Measure<Double, Duration>) timeSpanResultTuple |
| 59 | .get(1); |
| 60 | |
| 61 | // Calculate waiting time |
| 62 | Unit<Duration> unit = processingTimeSpanMeasure.getUnit(); |
| 63 | double demand = demandSample.getMeasure().doubleValue(unit); |
| 64 | double processingTime = processingTimeSpanMeasure.doubleValue(unit); |
| 65 | double waitingTime = processingTime - demand; |
| 66 | if (waitingTime < 0) { |
| 67 | // final double threshold = -0.000001; |
| 68 | // if (waitingTime < threshold) { |
| 69 | // throw new RuntimeException( |
| 70 | // "Calculated negative waiting time. This should not happen!"); |
| 71 | // } else { |
| 72 | waitingTime = 0; |
| 73 | // } |
| 74 | } |
| 75 | |
| 76 | // Create result tuple |
| 77 | Measure<Double, Duration> waitingTimeMeasure = Measure.valueOf( |
| 78 | waitingTime, unit); |
| 79 | Vector<Measure<?, ? extends Quantity>> resultTuple = new Vector<Measure<?, ? extends Quantity>>(); |
| 80 | resultTuple.add(waitingTimeMeasure); |
| 81 | resultTuple.add(endTimeMeasure); |
| 82 | |
| 83 | return resultTuple; |
| 84 | } |
| 85 | |
| 86 | @SuppressWarnings("unchecked") |
| 87 | private ProbeSample<Double, Duration> obtainDemandProbeSample( |
| 88 | ProbeSetSample probeSetSample) { |
| 89 | IMatchRule[] rules = new IMatchRule[1]; |
| 90 | rules[0] = new ProbeTypeMatchRule(ProbeType.RESOURCE_DEMAND); |
| 91 | Vector<ProbeSample<?, ? extends Quantity>> result = probeSetSample |
| 92 | .getProbeSamples(rules); |
| 93 | |
| 94 | if (result != null && result.size() > 0) |
| 95 | return (ProbeSample<Double, Duration>) result.get(0); |
| 96 | |
| 97 | return null; |
| 98 | } |
| 99 | |
| 100 | } |