source: xssim/src/example/localplugin/FCFSRandomClusterLocalPlugin.java @ 104

package example.localplugin;

import gridsim.Gridlet;

import java.util.List;
import java.util.Properties;
import java.util.Random;

import schedframe.scheduling.TaskInterface;
import schedframe.scheduling.events.SchedulingEvent;
import schedframe.scheduling.plugin.grid.ModuleList;
import test.rewolucja.GSSIMJobInterface;
import test.rewolucja.resources.manager.implementation.ClusterResourceManager;
import test.rewolucja.resources.manager.interfaces.ResourceManagerInterface;
import test.rewolucja.resources.physical.implementation.ComputingNode;
import test.rewolucja.scheduling.JobRegistryInterface;
import test.rewolucja.scheduling.plan.SchedulingPlanInterfaceNew;
import test.rewolucja.scheduling.plan.SchedulingPlanNew;
import test.rewolucja.scheduling.queue.GSSIMQueue;
import test.rewolucja.scheduling.queue.QueueList;

public class FCFSRandomClusterLocalPlugin extends BaseLocalPlugin {

        private Random rand;
        
        public FCFSRandomClusterLocalPlugin() {
                rand = new Random(5);
        }

        public SchedulingPlanInterfaceNew schedule(SchedulingEvent event, QueueList queues, JobRegistryInterface jobRegistry,
                         ResourceManagerInterface resManager, ModuleList modules) {

                ClusterResourceManager resourceManager = (ClusterResourceManager) resManager;
                SchedulingPlanNew plan = new SchedulingPlanNew();
                // chose the events types to serve.
                // Different actions for different events are possible.
                switch (event.getType()) {
                case START_TASK_EXECUTION:
                case TASK_FINISHED:
                        // our tasks are placed only in first queue (see
                        // BaseLocalPlugin.placeTasksInQueues() method)
                        GSSIMQueue q = queues.get(0);
                        // check all tasks in queue

                        for (int i = 0; i < q.size(); i++) {
                                GSSIMJobInterface<?> job = q.get(i);
                                TaskInterface<?> task = (TaskInterface<?>) job;
                                // if status of the tasks in READY
                                if (task.getStatus() == Gridlet.READY) {
                                        String nodeName = chooseRandomProvider(resourceManager);
                                        if (nodeName != null) {
                                                addToSchedulingPlan(plan, task, nodeName);
                                        }
                                }
                        }
                        break;
                }
                return plan;
        }

        private String chooseRandomProvider(ClusterResourceManager resourceManager) {
                List<ComputingNode> nodes = resourceManager.getComputingNodes();
                int nodeIdx = rand.nextInt(nodes.size());
                return nodes.get(nodeIdx).getName();
        }
        
        public String getName() {
                return getClass().getName();
        }

        public void init(Properties properties) {
                // no extra initialization is expected.
        }

}