| 1 | package de.uka.ipd.sdq.scheduler.loaddistribution.selectors.process; |
| 2 | |
| 3 | import de.uka.ipd.sdq.scheduler.loaddistribution.IProcessSelector; |
| 4 | import de.uka.ipd.sdq.scheduler.processes.IActiveProcess; |
| 5 | import de.uka.ipd.sdq.scheduler.queueing.IProcessQueue; |
| 6 | import de.uka.ipd.sdq.scheduler.queueing.IRunQueue; |
| 7 | import de.uka.ipd.sdq.scheduler.resources.IResourceInstance; |
| 8 | |
| 9 | public class PreferIdealAndLastProcessSelector implements IProcessSelector { |
| 10 | |
| 11 | public IActiveProcess select(IRunQueue runQueue, IResourceInstance instance) { |
| 12 | IProcessQueue queue = runQueue.getBestRunnableQueue(instance); |
| 13 | IActiveProcess result = null; |
| 14 | if (queue != null) { |
| 15 | for (IActiveProcess process : queue.ascending()) { |
| 16 | if (process.checkAffinity(instance)) { |
| 17 | if (result == null) { |
| 18 | result = process; |
| 19 | } else if (isPreferred(process, instance) |
| 20 | && !isPreferred(result, instance)) { |
| 21 | return process; |
| 22 | } |
| 23 | } |
| 24 | } |
| 25 | } |
| 26 | return result; |
| 27 | } |
| 28 | |
| 29 | private boolean isPreferred(IActiveProcess process, |
| 30 | IResourceInstance instance) { |
| 31 | return process.isIdealInstance(instance) |
| 32 | || process.isLastInstance(instance); |
| 33 | } |
| 34 | } |