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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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/*
 * CloudSim Plus: A modern, highly-extensible and easier-to-use Framework for
 * Modeling and Simulation of Cloud Computing Infrastructures and Services.
 * http://cloudsimplus.org
 *
 *     Copyright (C) 2015-2021 Universidade da Beira Interior (UBI, Portugal) and
 *     the Instituto Federal de Educação Ciência e Tecnologia do Tocantins (IFTO, Brazil).
 *
 *     This file is part of CloudSim Plus.
 *
 *     CloudSim Plus is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     CloudSim Plus is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with CloudSim Plus. If not, see .
 */
package org.cloudbus.cloudsim.allocationpolicies;

import org.cloudbus.cloudsim.datacenters.Datacenter;
import org.cloudbus.cloudsim.hosts.Host;
import org.cloudbus.cloudsim.hosts.HostSuitability;
import org.cloudbus.cloudsim.vms.Vm;
import org.cloudsimplus.autoscaling.VerticalVmScaling;

import java.util.*;
import java.util.function.BiFunction;

/**
 * A class that implements the Null Object Design Pattern for the {@link VmAllocationPolicy}
 * class.
 *
 * @author Manoel Campos da Silva Filho
 * @see VmAllocationPolicy#NULL
 */
final class VmAllocationPolicyNull implements VmAllocationPolicy {
    @Override public Datacenter getDatacenter() {
        return Datacenter.NULL;
    }
    @Override public void setDatacenter(Datacenter datacenter) {/**/}
    @Override public boolean scaleVmVertically(VerticalVmScaling scaling) {
        return false;
    }
    @Override public HostSuitability allocateHostForVm(Vm vm) {
        return HostSuitability.NULL;
    }
    @Override public HostSuitability allocateHostForVm(Vm vm, Host host) {
        return HostSuitability.NULL;
    }
    @Override public  List allocateHostForVm(Collection vmCollection) { return Collections.emptyList(); }
    @Override public void deallocateHostForVm(Vm vm) {/**/}
    @Override public List getHostList() { return Collections.emptyList(); }
    @Override public Map getOptimizedAllocationMap(List vmList) { return Collections.emptyMap(); }
    @Override public Optional findHostForVm(Vm vm) { return Optional.empty(); }
    @Override public boolean isVmMigrationSupported() { return false; }
    @Override public int getHostCountForParallelSearch() { return 0; }
    @Override public void setHostCountForParallelSearch(int hostCountForParallelSearch) {/**/}
    @Override public void setFindHostForVmFunction(BiFunction> findHostForVmFunction) {/**/}
}