| 1 | package de.uka.ipd.sdq.scheduler.loaddistribution.selectors.instance; |
| 2 | |
| 3 | import java.util.Iterator; |
| 4 | |
| 5 | import de.uka.ipd.sdq.scheduler.processes.IActiveProcess; |
| 6 | import de.uka.ipd.sdq.scheduler.resources.IResourceInstance; |
| 7 | import de.uka.ipd.sdq.scheduler.resources.active.SimActiveResource; |
| 8 | |
| 9 | |
| 10 | public class RoundRobinSelector extends AbstractInstanceSelector { |
| 11 | |
| 12 | Iterator<IResourceInstance> instance_iterator; |
| 13 | |
| 14 | public RoundRobinSelector(SimActiveResource resource) { |
| 15 | super(resource); |
| 16 | reset(); |
| 17 | } |
| 18 | |
| 19 | public IResourceInstance selectInstanceFor(IActiveProcess process, IResourceInstance running_on) { |
| 20 | IResourceInstance result = null; |
| 21 | while(result == null){ |
| 22 | IResourceInstance current = getNext(); |
| 23 | if (process.checkAffinity(current)){ |
| 24 | result = current; |
| 25 | if (!process.hasIdealInstance()){ |
| 26 | process.setIdealInstance(current); |
| 27 | } |
| 28 | } |
| 29 | } |
| 30 | return result; |
| 31 | } |
| 32 | |
| 33 | private IResourceInstance getNext() { |
| 34 | if (!instance_iterator.hasNext()) |
| 35 | reset(); |
| 36 | return instance_iterator.next(); |
| 37 | } |
| 38 | |
| 39 | private void reset() { |
| 40 | instance_iterator = resource.getInstanceList().iterator(); |
| 41 | } |
| 42 | } |