| 1 | package de.uka.ipd.sdq.scheduler.resources.passive; |
| 2 | |
| 3 | import de.uka.ipd.sdq.scheduler.ISchedulableProcess; |
| 4 | import de.uka.ipd.sdq.scheduler.LoggingWrapper; |
| 5 | import de.uka.ipd.sdq.scheduler.SchedulerModel; |
| 6 | import de.uka.ipd.sdq.scheduler.events.IDelayedAction; |
| 7 | import de.uka.ipd.sdq.scheduler.priority.IPriorityBoost; |
| 8 | import de.uka.ipd.sdq.scheduler.processes.IActiveProcess; |
| 9 | import de.uka.ipd.sdq.scheduler.processes.impl.ProcessWithPriority; |
| 10 | import de.uka.ipd.sdq.scheduler.resources.active.SimActiveResource; |
| 11 | import de.uka.ipd.sdq.scheduler.sensors.IPassiveResourceSensor; |
| 12 | |
| 13 | public class SimUnfairPassiveResource extends SimAbstractPassiveResource { |
| 14 | |
| 15 | private double acquisition_demand; |
| 16 | private boolean isFifo; |
| 17 | private int available; |
| 18 | private PassiveResourceObservee observee; |
| 19 | |
| 20 | public SimUnfairPassiveResource(SchedulerModel model, int capacity, String name, String id, |
| 21 | IPriorityBoost priority_boost, SimActiveResource managing_resource, |
| 22 | double acquisition_demand, boolean isFifo) { |
| 23 | super(model, capacity, name, id, priority_boost, managing_resource); |
| 24 | this.acquisition_demand = acquisition_demand; |
| 25 | this.isFifo = isFifo; |
| 26 | available = capacity; |
| 27 | observee = new PassiveResourceObservee(); |
| 28 | } |
| 29 | |
| 30 | public boolean acquire(ISchedulableProcess sched_process, int num, |
| 31 | boolean timeout, double timeoutValue) { |
| 32 | |
| 33 | // AM: Copied from AbstractActiveResource: If simulation is stopped, |
| 34 | // allow all processes to finish |
| 35 | if (!getModel().getSimulationControl().isRunning()) { |
| 36 | // Do nothing, but allows calling process to complete |
| 37 | return true; |
| 38 | } |
| 39 | |
| 40 | observee.fireRequest(sched_process, num); |
| 41 | ProcessWithPriority process = (ProcessWithPriority) main_resource |
| 42 | .lookUp(sched_process); |
| 43 | if (num <= available) { |
| 44 | grantAccess(num, process); |
| 45 | return true; |
| 46 | } else { |
| 47 | LoggingWrapper.log("Process " + process + " is waiting for " + num |
| 48 | + " of " + this); |
| 49 | WaitingProcess waiting_process = new WaitingProcess(process, num); |
| 50 | fromRunningToWaiting(waiting_process, !isFifo); |
| 51 | process.getSchedulableProcess().passivate(); |
| 52 | return false; |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | private void grantAccess(int num, ProcessWithPriority process) { |
| 57 | LoggingWrapper.log("Process " + process + " acquires " + num + " of " |
| 58 | + this); |
| 59 | punish(process); |
| 60 | boostPriority(process); |
| 61 | available -= num; |
| 62 | observee.fireAquire(process.getSchedulableProcess(), num); |
| 63 | assert available >= 0 : "More resource than available have been acquired!"; |
| 64 | } |
| 65 | |
| 66 | public void release(ISchedulableProcess sched_process, int num) { |
| 67 | |
| 68 | // AM: Copied from AbstractActiveResource: If simulation is stopped, |
| 69 | // allow all processes to finish |
| 70 | if (!getModel().getSimulationControl().isRunning()) { |
| 71 | // Do nothing, but allows calling process to complete |
| 72 | return; |
| 73 | } |
| 74 | |
| 75 | LoggingWrapper.log("Process " + sched_process + " releases " + num |
| 76 | + " of " + this); |
| 77 | available += num; |
| 78 | observee.fireRelease(sched_process, num); |
| 79 | notifyNextWaitingProcess(); |
| 80 | } |
| 81 | |
| 82 | private void notifyNextWaitingProcess() { |
| 83 | WaitingProcess waiting_process = waiting_queue.peek(); |
| 84 | if (waiting_process != null) { |
| 85 | IActiveProcess process = waiting_process.getProcess(); |
| 86 | process.setCurrentDemand(acquisition_demand); |
| 87 | process.setDelayedAction(new UnfairAccessAction(waiting_process)); |
| 88 | fromWaitingToReady(waiting_process, process.getLastInstance()); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * Tries to remove the given process from the waiting queue and get access |
| 94 | * of the required number of passive resources. |
| 95 | * |
| 96 | * @param waitingProcess |
| 97 | * @return True if the process was successfully dequeued and activated, |
| 98 | * otherwise false. |
| 99 | */ |
| 100 | protected boolean tryToDequeueProcess(WaitingProcess waitingProcess) { |
| 101 | if (waitingProcess.getNumRequested() <= available) { |
| 102 | grantAccess(waitingProcess.getNumRequested(), |
| 103 | (ProcessWithPriority) waitingProcess.getProcess()); |
| 104 | if (available > 0) |
| 105 | notifyNextWaitingProcess(); |
| 106 | return true; |
| 107 | } else { |
| 108 | return false; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | private class UnfairAccessAction implements IDelayedAction { |
| 113 | private WaitingProcess waiting_process; |
| 114 | |
| 115 | public UnfairAccessAction(WaitingProcess waiting_process) { |
| 116 | super(); |
| 117 | this.waiting_process = waiting_process; |
| 118 | } |
| 119 | |
| 120 | public boolean perform() { |
| 121 | if (!tryToDequeueProcess(waiting_process)) { |
| 122 | fromRunningToWaiting(waiting_process, true); |
| 123 | return false; |
| 124 | } else { |
| 125 | waiting_process.getProcess().getSchedulableProcess().activate(); |
| 126 | return true; |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | public void addObserver(IPassiveResourceSensor observer) { |
| 132 | observee.addObserver(observer); |
| 133 | } |
| 134 | |
| 135 | public void removeObserver(IPassiveResourceSensor observer) { |
| 136 | observee.removeObserver(observer); |
| 137 | } |
| 138 | |
| 139 | public int getAvailable() { |
| 140 | return available; |
| 141 | } |
| 142 | |
| 143 | } |