| 1 | package de.uka.ipd.sdq.scheduler.resources.active; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.List; |
| 5 | |
| 6 | import de.uka.ipd.sdq.scheduler.IActiveResource; |
| 7 | import de.uka.ipd.sdq.scheduler.IRunningProcess; |
| 8 | import de.uka.ipd.sdq.scheduler.SchedulerModel; |
| 9 | import de.uka.ipd.sdq.scheduler.entities.SchedulerEntity; |
| 10 | import de.uka.ipd.sdq.scheduler.events.SchedulingEvent; |
| 11 | import de.uka.ipd.sdq.scheduler.events.SchedulingInterruptEvent; |
| 12 | import de.uka.ipd.sdq.scheduler.resources.IResourceInstance; |
| 13 | import de.uka.ipd.sdq.scheduler.sensors.IActiveResourceStateSensor; |
| 14 | |
| 15 | public class SimResourceInstance extends SchedulerEntity implements IResourceInstance { |
| 16 | |
| 17 | private int number; |
| 18 | private IActiveResource containing_resource; |
| 19 | private IRunningProcess running_process; |
| 20 | |
| 21 | /** |
| 22 | * The variable last_running_process is necessary to fake (!!!) changes in |
| 23 | * the association of light weight processes (LWPs) and threads, since the |
| 24 | * current scheduler simulator does not reflect this association (it just |
| 25 | * models 'processes'). For a solid model, this distinction is mandatory. |
| 26 | * |
| 27 | * |
| 28 | * The last_running_process is used to fake the different treatment of |
| 29 | * threads in load balancing. |
| 30 | * |
| 31 | * So, what's the difficulty there? |
| 32 | * |
| 33 | * As soon as a thread is put to sleep, its LWP looks for a new thread (of |
| 34 | * the same heavyweight process) to execute for its remaining timeslice. It |
| 35 | * prefers the last thread in the busiest run queue. This leads to a new |
| 36 | * LWP-to-thread mapping. Basically, the LWPs of both threads are switched. |
| 37 | * |
| 38 | * This behavior differs significantly from process load balancing, where |
| 39 | * the LWP is moved to a new processor! |
| 40 | * |
| 41 | */ |
| 42 | private IRunningProcess last_running_process; |
| 43 | |
| 44 | private SchedulingEvent scheduling_event; |
| 45 | private boolean isScheduling; |
| 46 | private List<IActiveResourceStateSensor> resourceObserverList = new ArrayList<IActiveResourceStateSensor>(); |
| 47 | |
| 48 | public SimResourceInstance(SchedulerModel model, int number, IActiveResource containing_resource) { |
| 49 | super(model, SimResourceInstance.class.getName()); |
| 50 | this.number = number; |
| 51 | this.containing_resource = containing_resource; |
| 52 | // Initialise this at start instead of container for multiple Simulation |
| 53 | // runs with different simulator instances... |
| 54 | // this.scheduling_event = new |
| 55 | // SchedulingEvent((SimActiveResource)containing_resource,this); |
| 56 | this.running_process = null; |
| 57 | this.isScheduling = false; |
| 58 | } |
| 59 | |
| 60 | public IRunningProcess getRunningProcess() { |
| 61 | return running_process; |
| 62 | } |
| 63 | |
| 64 | public void release() { |
| 65 | this.last_running_process = running_process; |
| 66 | this.running_process = null; |
| 67 | updateObservers(); |
| 68 | } |
| 69 | |
| 70 | private void updateObservers() { |
| 71 | for (IActiveResourceStateSensor observer : resourceObserverList) { |
| 72 | observer.update(getQueueLength(), getId()); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | public void addObserver(IActiveResourceStateSensor observer) { |
| 77 | resourceObserverList.add(observer); |
| 78 | } |
| 79 | |
| 80 | public void removeObserver(IActiveResourceStateSensor observer) { |
| 81 | resourceObserverList.remove(observer); |
| 82 | } |
| 83 | |
| 84 | public boolean processAssigned() { |
| 85 | return running_process != null; |
| 86 | } |
| 87 | |
| 88 | public void assign(IRunningProcess process) { |
| 89 | assert !this.processAssigned() : "There is already a process executing on resource instance " |
| 90 | + this; |
| 91 | running_process = process; |
| 92 | updateObservers(); |
| 93 | } |
| 94 | |
| 95 | public String getName() { |
| 96 | return containing_resource.getName() + "_" + number; |
| 97 | } |
| 98 | |
| 99 | public void scheduleSchedulingEvent(double time) { |
| 100 | cancelSchedulingEvent(); |
| 101 | scheduling_event.schedule(this, time); |
| 102 | } |
| 103 | |
| 104 | public void schedulingInterrupt(double time) { |
| 105 | new SchedulingInterruptEvent(getModel(), (SimActiveResource) containing_resource).schedule(this, time); |
| 106 | } |
| 107 | |
| 108 | public void cancelSchedulingEvent() { |
| 109 | scheduling_event.removeEvent(); |
| 110 | } |
| 111 | |
| 112 | @Override |
| 113 | public String toString() { |
| 114 | return getName(); |
| 115 | } |
| 116 | |
| 117 | @Override |
| 118 | public boolean equals(Object obj) { |
| 119 | if (obj instanceof SimResourceInstance) { |
| 120 | SimResourceInstance instance = (SimResourceInstance) obj; |
| 121 | return this.getId() == instance.getId(); |
| 122 | } |
| 123 | return false; |
| 124 | } |
| 125 | |
| 126 | public int getId() { |
| 127 | return number; |
| 128 | } |
| 129 | |
| 130 | @Override |
| 131 | public int hashCode() { |
| 132 | return (getName() + getId()).hashCode(); |
| 133 | } |
| 134 | |
| 135 | public double getNextSchedEventTime() { |
| 136 | double simTime = getModel().getSimulationControl().getCurrentSimulationTime(); |
| 137 | double eventTime = scheduling_event.scheduledAtTime(); |
| 138 | return eventTime - simTime; |
| 139 | } |
| 140 | |
| 141 | public void start() { |
| 142 | this.scheduling_event = new SchedulingEvent(getModel(), |
| 143 | (SimActiveResource) containing_resource); |
| 144 | scheduling_event.schedule(this, 0); |
| 145 | } |
| 146 | |
| 147 | public void stop() { |
| 148 | scheduling_event.removeEvent(); |
| 149 | } |
| 150 | |
| 151 | public void setIsScheduling(boolean b) { |
| 152 | isScheduling = b; |
| 153 | } |
| 154 | |
| 155 | public boolean isScheduling() { |
| 156 | return isScheduling; |
| 157 | } |
| 158 | |
| 159 | public boolean isIdle() { |
| 160 | return running_process == null; |
| 161 | } |
| 162 | |
| 163 | public IRunningProcess getLastRunningProcess() { |
| 164 | return last_running_process; |
| 165 | } |
| 166 | |
| 167 | public int getQueueLength() { |
| 168 | return containing_resource.getQueueLengthFor(this); |
| 169 | } |
| 170 | |
| 171 | } |