| 1 | package de.uka.ipd.sdq.scheduler.timeslice.impl; |
| 2 | |
| 3 | import de.uka.ipd.sdq.probfunction.math.util.MathTools; |
| 4 | import de.uka.ipd.sdq.scheduler.timeslice.ITimeSlice; |
| 5 | |
| 6 | |
| 7 | public class QuantumTimeSlice implements ITimeSlice { |
| 8 | |
| 9 | protected double remaining_time; |
| 10 | protected double timeslice; |
| 11 | protected int remaining_quanta; |
| 12 | protected int quanta; // Windows default : 6 |
| 13 | protected int min_quanta; // Windows default : 2 |
| 14 | |
| 15 | public QuantumTimeSlice(double timeslice, int quanta, int min_quanta) { |
| 16 | super(); |
| 17 | |
| 18 | assert timeslice > 0 : "Timeslice must be larger than 0."; |
| 19 | assert quanta > 0 : "Quanta must be larger than 0."; |
| 20 | assert min_quanta > 0 : "Min Quanta must be larger than 0."; |
| 21 | |
| 22 | this.timeslice = timeslice; |
| 23 | this.quanta = quanta; |
| 24 | this.min_quanta = min_quanta; |
| 25 | this.remaining_time = 0; |
| 26 | this.remaining_quanta = 0; |
| 27 | } |
| 28 | |
| 29 | protected QuantumTimeSlice(){ |
| 30 | this.timeslice = 0; |
| 31 | this.remaining_time = 0; |
| 32 | this.remaining_quanta = 0; |
| 33 | } |
| 34 | |
| 35 | |
| 36 | public boolean isFinished() { |
| 37 | return MathTools.equalsDouble(remaining_time, 0.0); |
| 38 | } |
| 39 | |
| 40 | |
| 41 | public void substractTime(double time) { |
| 42 | remaining_time -= time; |
| 43 | |
| 44 | double half = timeslice / 2; |
| 45 | if (remaining_time <= half && (remaining_time + time) > half){ |
| 46 | remaining_quanta -= (quanta / 2); |
| 47 | if (MathTools.equalsDouble(remaining_time, 0)){ |
| 48 | remaining_quanta = 0; |
| 49 | } |
| 50 | } |
| 51 | assert MathTools.lessOrEqual(0.0, remaining_time) : "Timeslice exceeded: " + remaining_time; |
| 52 | } |
| 53 | |
| 54 | |
| 55 | public void reset() { |
| 56 | remaining_time = timeslice; |
| 57 | remaining_quanta = quanta; |
| 58 | } |
| 59 | |
| 60 | |
| 61 | public void fullReset() { |
| 62 | remaining_time = timeslice; |
| 63 | remaining_quanta = quanta; |
| 64 | } |
| 65 | |
| 66 | |
| 67 | public double getRemainingTime() { |
| 68 | return remaining_time; |
| 69 | } |
| 70 | |
| 71 | |
| 72 | public void punish(int penalty) { |
| 73 | remaining_quanta--; |
| 74 | } |
| 75 | |
| 76 | |
| 77 | public void setExpired() { |
| 78 | this.remaining_time = 0; |
| 79 | this.remaining_quanta = 0; |
| 80 | |
| 81 | } |
| 82 | |
| 83 | @Override |
| 84 | public ITimeSlice clone() { |
| 85 | QuantumTimeSlice cts = new QuantumTimeSlice(); |
| 86 | cts.timeslice = this.timeslice; |
| 87 | cts.quanta = this.quanta; |
| 88 | cts.remaining_time = this.remaining_time; |
| 89 | cts.remaining_quanta = this.remaining_quanta; |
| 90 | return cts; |
| 91 | } |
| 92 | |
| 93 | |
| 94 | public void halfReset() { |
| 95 | int factor = 0; |
| 96 | if (remaining_quanta > 4) |
| 97 | factor = 2; |
| 98 | else if (remaining_quanta > 1) |
| 99 | factor = 1; |
| 100 | remaining_time = timeslice/2 * factor; |
| 101 | } |
| 102 | |
| 103 | public void updateTimeForBoosting() { |
| 104 | if (remaining_quanta < min_quanta) { |
| 105 | remaining_time = 0; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | public void updateTimeForScheduling() { |
| 110 | } |
| 111 | } |