source: DCWoRMS/trunk/src/example/localplugin/FCFSRandomClusterLocalPlugin.java @ 497

package example.localplugin;

import gridsim.dcworms.DCWormsTags;

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

import schedframe.events.scheduling.SchedulingEvent;
import schedframe.resources.computing.ComputingNode;
import schedframe.scheduling.manager.resources.ClusterResourceManager;
import schedframe.scheduling.manager.resources.ResourceManager;
import schedframe.scheduling.manager.tasks.JobRegistry;
import schedframe.scheduling.plan.SchedulingPlanInterface;
import schedframe.scheduling.plan.impl.SchedulingPlan;
import schedframe.scheduling.plugin.grid.ModuleList;
import schedframe.scheduling.queue.TaskQueue;
import schedframe.scheduling.queue.TaskQueueList;
import schedframe.scheduling.tasks.TaskInterface;
import schedframe.scheduling.tasks.WorkloadUnit;

public class FCFSRandomClusterLocalPlugin extends BaseLocalSchedulingPlugin {

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

        public SchedulingPlanInterface<?> schedule(SchedulingEvent event, TaskQueueList queues, JobRegistry jobRegistry,
                         ResourceManager resManager, ModuleList modules) {

                ClusterResourceManager resourceManager = (ClusterResourceManager) resManager;
                SchedulingPlan plan = new SchedulingPlan();
                // chose the events types to serve.
                // Different actions for different events are possible.
                switch (event.getType()) {
                case START_TASK_EXECUTION:
                case TASK_FINISHED:
                //case TIMER:
                        // our tasks are placed only in first queue (see
                        // BaseLocalPlugin.placeJobsInQueues() method)
                        TaskQueue q = queues.get(0);
                        
                        // check all tasks in queue
                        for (int i = 0; i < q.size(); i++) {
                                WorkloadUnit job = q.get(i);
                                TaskInterface<?> task = (TaskInterface<?>) job;
                                // if status of the tasks in READY
                                if (task.getStatus() == DCWormsTags.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();
        }

}