| 1 | package de.uka.ipd.sdq.simulation.abstractsimengine.processes; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.List; |
| 5 | |
| 6 | import org.apache.log4j.Logger; |
| 7 | |
| 8 | import de.uka.ipd.sdq.simulation.abstractsimengine.AbstractSimProcessDelegator; |
| 9 | import de.uka.ipd.sdq.simulation.abstractsimengine.ISimProcess; |
| 10 | import de.uka.ipd.sdq.simulation.abstractsimengine.ISimProcessListener; |
| 11 | |
| 12 | public abstract class SimulatedProcess implements ISimProcess { |
| 13 | |
| 14 | public static final Logger logger = Logger.getLogger(SimulatedProcess.class); |
| 15 | |
| 16 | /** |
| 17 | * Current state of this process |
| 18 | */ |
| 19 | public ProcessState myProcessState = ProcessState.READY; |
| 20 | |
| 21 | /** |
| 22 | * A list of process listeners getting notifications on resume and suspend |
| 23 | */ |
| 24 | protected final List<ISimProcessListener> listeners; |
| 25 | |
| 26 | /** |
| 27 | * Strategy used to suspend threads if requested |
| 28 | */ |
| 29 | public final ISimProcessStrategy processStrategy; |
| 30 | |
| 31 | /** |
| 32 | * Default constructor. |
| 33 | * @param processStrategy |
| 34 | */ |
| 35 | public SimulatedProcess(ISimProcessStrategy processStrategy) { |
| 36 | this.processStrategy = processStrategy; |
| 37 | this.listeners = new ArrayList<ISimProcessListener>(); |
| 38 | } |
| 39 | |
| 40 | public void startProcess(ISimProcessStrategy processStrategy) { |
| 41 | Runnable myRunnable = new Runnable() { |
| 42 | public void run() { |
| 43 | if (logger.isDebugEnabled()) { |
| 44 | logger.debug("Starting sim process [ID: " + getAbstractProcess().getId() + "]"); |
| 45 | } |
| 46 | actions(); |
| 47 | // SSJSimProcess.this.processStrategy = null; |
| 48 | if (logger.isDebugEnabled()) { |
| 49 | logger.debug("Sim process ended [ID: " + getAbstractProcess().getId() + "]"); |
| 50 | } |
| 51 | } |
| 52 | }; |
| 53 | |
| 54 | processStrategy.startProcess(myRunnable); |
| 55 | } |
| 56 | |
| 57 | public void actions() { |
| 58 | // set state to running and suspended, i.e., return to constructor |
| 59 | this.myProcessState = ProcessState.RUNNING; |
| 60 | suspend(); |
| 61 | |
| 62 | // execute process's behavior |
| 63 | getAbstractProcess().lifeCycle(); |
| 64 | |
| 65 | // terminate process |
| 66 | this.myProcessState = ProcessState.TERMINATED; |
| 67 | processStrategy.finishProcess(); |
| 68 | } |
| 69 | |
| 70 | public boolean isTerminated() { |
| 71 | return this.myProcessState == ProcessState.TERMINATED; |
| 72 | } |
| 73 | |
| 74 | public void passivate() { |
| 75 | suspend(); |
| 76 | } |
| 77 | |
| 78 | abstract protected AbstractSimProcessDelegator getAbstractProcess(); |
| 79 | |
| 80 | public void suspend() { |
| 81 | if (this.myProcessState != ProcessState.RUNNING) |
| 82 | throw new IllegalStateException("Tried to suspend non-running process [" + this.getAbstractProcess().getId() |
| 83 | + "]"); |
| 84 | if (logger.isDebugEnabled()) { |
| 85 | logger.debug("Suspending thread [" + this.getAbstractProcess().getId() + "]"); |
| 86 | } |
| 87 | |
| 88 | // notify listeners of the imminent suspend |
| 89 | notifyListeners(this, true); |
| 90 | |
| 91 | // suspend this process |
| 92 | this.myProcessState = ProcessState.SUSPENDED; |
| 93 | processStrategy.suspendProcess(); |
| 94 | |
| 95 | // notify listeners of the imminent resume |
| 96 | notifyListeners(this, false); |
| 97 | } |
| 98 | |
| 99 | protected void resume() { |
| 100 | if (this.myProcessState != ProcessState.SUSPENDED) |
| 101 | throw new IllegalStateException("Tried to resume thread which was not suspended [" |
| 102 | + this.getAbstractProcess().getId() + "]"); |
| 103 | if (logger.isDebugEnabled()) { |
| 104 | logger.debug("Resuming thread [" + this.getAbstractProcess().getId() + "]"); |
| 105 | } |
| 106 | |
| 107 | // resume this process |
| 108 | this.myProcessState = ProcessState.RUNNING; |
| 109 | processStrategy.resumeProcess(); |
| 110 | } |
| 111 | |
| 112 | public void addProcessListener(ISimProcessListener l) { |
| 113 | this.listeners.add(l); |
| 114 | } |
| 115 | |
| 116 | public void removeProcessListener(ISimProcessListener l) { |
| 117 | this.listeners.remove(l); |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Notifies registered listeners that the given process is about to be suspended or resumed |
| 122 | * again. |
| 123 | * |
| 124 | * @param process |
| 125 | * the process which is being resumed or suspended |
| 126 | * @param isSuspending |
| 127 | * true, if the process is about to be suspended; false, if the process is about to |
| 128 | * be resumed |
| 129 | */ |
| 130 | protected void notifyListeners(ISimProcess process, boolean isSuspending) { |
| 131 | for (ISimProcessListener l : listeners) { |
| 132 | if (isSuspending) { |
| 133 | l.notifySuspending(process); |
| 134 | } else { |
| 135 | l.notifyResuming(process); |
| 136 | } |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | } |