| 1 | package de.uka.ipd.sdq.simucomframework.fork; |
| 2 | |
| 3 | import org.apache.log4j.Logger; |
| 4 | |
| 5 | import de.uka.ipd.sdq.simucomframework.SimuComSimProcess; |
| 6 | |
| 7 | /** |
| 8 | * Helper to execute a fork action in the PCM. Implements the |
| 9 | * barrier design pattern. |
| 10 | * @author Steffen Becker |
| 11 | * |
| 12 | */ |
| 13 | public class ForkExecutor { |
| 14 | private ForkedBehaviourProcess[] forks; |
| 15 | private SimuComSimProcess parent; |
| 16 | private static Logger logger = |
| 17 | Logger.getLogger(ForkExecutor.class.getName()); |
| 18 | |
| 19 | /** |
| 20 | * Initialise the barrier with the forks to spawn and the parent process |
| 21 | * which is continoued when all forks are done |
| 22 | * @param parent The parent simulation thread |
| 23 | * @param forks The threads to run in parallel |
| 24 | */ |
| 25 | public ForkExecutor(SimuComSimProcess parent, ForkedBehaviourProcess[] forks) { |
| 26 | this.forks = forks; |
| 27 | this.parent = parent; |
| 28 | } |
| 29 | |
| 30 | /** |
| 31 | * Execute the child threads in parallel waiting for them to finish |
| 32 | */ |
| 33 | public void run() { |
| 34 | logger.debug("Running parallel operations"); |
| 35 | double start = parent.getModel().getSimulationControl().getCurrentSimulationTime(); |
| 36 | for(ForkedBehaviourProcess p : forks) |
| 37 | p.scheduleAt(0); |
| 38 | while(checkIfRemainingChildrenRun()) |
| 39 | parent.passivate(); |
| 40 | logger.debug("Forks took: "+(parent.getModel().getSimulationControl().getCurrentSimulationTime()-start)); |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * @return True if there are child forks still running. This needs not be |
| 45 | * threadsafe as desmoj always exeutes only a single thread |
| 46 | */ |
| 47 | private boolean checkIfRemainingChildrenRun() { |
| 48 | for(ForkedBehaviourProcess p : forks) |
| 49 | if (!p.isAsync() && !p.isTerminated()) |
| 50 | return true; |
| 51 | return false; |
| 52 | } |
| 53 | } |