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CloudSim Plus: A modern, highly extensible and easier-to-use Java 8 Framework for Modeling and Simulation of Cloud Computing Infrastructures and Services

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/*
 * Title:        CloudSim Toolkit
 * Description:  CloudSim (Cloud Simulation) Toolkit for Modeling and Simulation of Clouds
 * Licence:      GPL - http://www.gnu.org/copyleft/gpl.html
 *
 * Copyright (c) 2009-2012, The University of Melbourne, Australia
 */

package org.cloudbus.cloudsim.selectionpolicies.power;

import org.cloudbus.cloudsim.hosts.Host;
import org.cloudbus.cloudsim.vms.Vm;

import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import java.util.function.Predicate;

/**
 * A VM selection policy that selects for migration the VM with Minimum Utilization (MU)
 * of CPU.
 * 
 * 
If you are using any algorithms, policies or workload included in the power package please cite
 * the following paper:

 * 

 * 

 * Anton Beloglazov, and Rajkumar Buyya, "Optimal Online Deterministic Algorithms and Adaptive
 * Heuristics for Energy and Performance Efficient Dynamic Consolidation of Virtual Machines in
 * Cloud Data Centers", Concurrency and Computation: Practice and Experience (CCPE), Volume 24,
 * Issue 13, Pages: 1397-1420, John Wiley & Sons, Ltd, New York, USA, 2012
 * 
 *
 * @author Anton Beloglazov
 * @since CloudSim Toolkit 3.0
 */
public class PowerVmSelectionPolicyMinimumUtilization extends PowerVmSelectionPolicy {
    @Override
    public Vm getVmToMigrate(Host host) {
        final List migratableVms = getMigratableVms(host);
        if (migratableVms.isEmpty()) {
            return Vm.NULL;
        }

        final Predicate inMigration = Vm::isInMigration;
        final Comparator cpuUsageComparator =
            Comparator.comparingDouble(vm -> vm.getCpuPercentUsage(vm.getSimulation().clock()));
        final Optional optional = migratableVms.stream()
            .filter(inMigration.negate())
            .min(cpuUsageComparator);
        return (optional.isPresent() ? optional.get() : Vm.NULL);
    }

}