Network.java

package system;

import application.Application;
import device.Device;
import device.EnergyModel;
import device.PiecewiseLinear;
import org.apache.commons.math3.util.Pair;
import placement.RequestPlacementOutput;
import utils.Config;
import utils.Distribution;
import utils.NormalDistribution;
import utils.Utils;
import org.jgrapht.Graph;
import org.jgrapht.GraphPath;
import org.jgrapht.alg.interfaces.ShortestPathAlgorithm;
import org.jgrapht.alg.shortestpath.DijkstraShortestPath;
import org.jgrapht.graph.DefaultUndirectedWeightedGraph;
import org.jgrapht.graph.DefaultWeightedEdge;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Network {

    List<Device> edgeDevices = new ArrayList<Device>();
    Map<String, Device> nameToDevice;

    Application application;

    Graph<Device, DefaultWeightedEdge> graph;
    DijkstraShortestPath<Device, DefaultWeightedEdge> dijkstraAlg;

    Map<String,Double> utilization;
    Map<String,Double> time_links = new HashMap<>();//Create container
    Map<String,Double> energy_links = new HashMap<>();//Create container
    Map<String,Double> energy_residual_links = new HashMap<>();//Create container
    Map<String,Double> time_devices = new HashMap<>();//Create container
    Map<String,Double> energy_devices = new HashMap<>();//Create container
    Map<String,Double> energy_residual_devices = new HashMap<>();//Create container

    String placingDevice;

    EnergyModel energyModel;

    Boolean oneCoreAllocation;

    public Network(Application applicationConsidered, String placingDevice, boolean oneCoreAllocation_){

        application= applicationConsidered;
        this.placingDevice=placingDevice;

        //Locations according to Abilene
        Map<Integer,Location> locationInfo = new HashMap<Integer,Location>();

        Location location0= new Location(40.71427,-74.00597);
        locationInfo.put(0,location0);
        Location location1= new Location(41.85003,-87.65005);
        locationInfo.put(1,location1);
        Location location2= new Location(38.89511,-77.03637);
        locationInfo.put(2,location2);
        Location location3= new Location(47.60621,-122.33207);
        locationInfo.put(3,location3);
        Location location4= new Location(37.36883,-122.03635);
        locationInfo.put(4,location4);
        Location location5= new Location(34.05223,-118.24368);
        locationInfo.put(5,location5);
        Location location6= new Location(39.73915,-104.9847);
        locationInfo.put(6,location6);
        Location location7= new Location(39.11417,-94.62746);
        locationInfo.put(7,location7);
        Location location8= new Location(29.76328,-95.36327);
        locationInfo.put(8,location8);
        Location location9= new Location(33.749,-84.38798);
        locationInfo.put(9,location9);
        Location location10= new Location(39.76838,-86.15804);
        locationInfo.put(10,location10);

        for (int i = 0; i < 11; i++) {

            Device gateway = createEdgeDevice("gateway_" + i, 300 , Device.EDGE);
            gateway.setLocationInformation(locationInfo.get(i));
            edgeDevices.add(gateway);
        }

        createNetworkGraph();
        dijkstraAlg = new DijkstraShortestPath<>(graph);

        energyModel = new PiecewiseLinear();
        oneCoreAllocation=oneCoreAllocation_;
    }

    private void createNetworkGraph(){
        graph = new DefaultUndirectedWeightedGraph<>(DefaultWeightedEdge.class);

        //Utility map returning Device based on name - used for creating the links easier
        nameToDevice= new HashMap<String, Device>();

        // Add vertices
        for (Device edgeDevice: edgeDevices) {
            if(edgeDevice.getName().contains("gateway")){ //All of them should
                graph.addVertex(edgeDevice);
                //Adding the node to the map
                nameToDevice.put(edgeDevice.getName(), edgeDevice);
            }
        }

        //Add edges - hardcoded to Abilene
        graph.addEdge(nameToDevice.get("gateway_0"),nameToDevice.get("gateway_1"));
        graph.addEdge(nameToDevice.get("gateway_0"),nameToDevice.get("gateway_2"));
        graph.addEdge(nameToDevice.get("gateway_1"),nameToDevice.get("gateway_10"));
        graph.addEdge(nameToDevice.get("gateway_2"),nameToDevice.get("gateway_9"));
        graph.addEdge(nameToDevice.get("gateway_3"),nameToDevice.get("gateway_6"));
        graph.addEdge(nameToDevice.get("gateway_3"),nameToDevice.get("gateway_4"));
        graph.addEdge(nameToDevice.get("gateway_4"),nameToDevice.get("gateway_5"));
        graph.addEdge(nameToDevice.get("gateway_4"),nameToDevice.get("gateway_6"));
        graph.addEdge(nameToDevice.get("gateway_6"),nameToDevice.get("gateway_7"));
        graph.addEdge(nameToDevice.get("gateway_7"),nameToDevice.get("gateway_8"));
        graph.addEdge(nameToDevice.get("gateway_7"),nameToDevice.get("gateway_10"));
        graph.addEdge(nameToDevice.get("gateway_5"),nameToDevice.get("gateway_8"));
        graph.addEdge(nameToDevice.get("gateway_8"),nameToDevice.get("gateway_9"));
        graph.addEdge(nameToDevice.get("gateway_9"),nameToDevice.get("gateway_10"));

        //Set the edge weights
        for (DefaultWeightedEdge edge: graph.edgeSet()){
            double calculatedWeight = calculateWeight(graph.getEdgeSource(edge), graph.getEdgeTarget(edge));
            graph.setEdgeWeight(edge,calculatedWeight);
        }
    }

    public double getLinkTransmissionTime(String startFunctionInstance, String destinationFunctionInstance){
            //Check if we already have it
            Double linkTiming = time_links.get(startFunctionInstance+"=>"+destinationFunctionInstance);
            if(linkTiming==null){
                //We need to calculate it
                //Get size to be transmitted
                Double size = application.getTargetFunctionNwSize(Utils.getTargetFunction(startFunctionInstance+"=>"+destinationFunctionInstance));
                //Get current utilization
                Pair<String, String> nameSplitStart= Utils.splitLongFunctionInstanceName(startFunctionInstance);
                Pair<String, String> nameSplitDestination= Utils.splitLongFunctionInstanceName(destinationFunctionInstance);
                //Check for start/end nodes
                if(nameSplitStart.getKey().equals(Utils.START)||nameSplitStart.getKey().equals(Utils.END)){
                    //OBS for now start and end are the same
                    String value= nameSplitStart.getValue();//Should be empty string
                    nameSplitStart=new Pair<>(placingDevice,value);
                }
                if(nameSplitDestination.getKey().equals(Utils.START)||nameSplitDestination.getKey().equals(Utils.END)){
                    //OBS for now start and end are the same
                    String value= nameSplitDestination.getValue();//Should be empty string
                    nameSplitDestination=new Pair<>(placingDevice,value);
                }

                //Special case where end and start are the same - then transmission time is 0
                if(nameSplitStart.getKey().equals(nameSplitDestination.getKey())){
                    linkTiming=0.0;
                }else {
                    Double currentUtilization = utilization.get(nameSplitStart.getKey() + "=>" + nameSplitDestination.getKey());
                    //Get available capacity
                    Double availableCapacity = Config.DEFAULT_LINK_CAPACITY * (1-(currentUtilization / 100));
                    //Get link latency
                    Double linkLatency = getLinkLatency(nameSplitStart.getKey(), nameSplitDestination.getKey());
                    //Calculate according to formula
                    if (availableCapacity==0){
                        linkTiming = Double.valueOf(Config.INFINITE);
                    }else {
                        linkTiming = (size / availableCapacity) + linkLatency;
                    }
                }
                //Add to the Map variable
                time_links.put(startFunctionInstance+"=>"+destinationFunctionInstance, linkTiming);
            }
            return linkTiming;
    }

    public double getExecutionTime(String device, String functionInstance){
            //Check if we already have it
            Double deviceTiming = time_devices.get(device+"-"+functionInstance);
            if(deviceTiming==null){
                //We need to calculate it
                //Get utilization value for this device
                Double currentUtilization = utilization.get(device);
                //Get size to be calculated
                Double size = application.getTargetFunctionCPUSize(functionInstance);
                //Get capacity allocated to the function instance
                Double allocatedCapacity=getAllocatedCapacity(currentUtilization);

                //Calculate according to formula
                if (allocatedCapacity==0){
                    deviceTiming=Double.valueOf(Config.INFINITE);
                }else {
                    deviceTiming = (size / allocatedCapacity);
                }
                //Add to the Map variable
                time_devices.put(device+"-"+functionInstance, deviceTiming);
            }
            return deviceTiming;
    }

    private Double getAllocatedCapacity(Double currentUtilization){
        //Get available capacity
        Double availableCapacity = Config.DEFAULT_DEVICE_CAPACITY_PER_CORE*Config.DEFAULT_DEVICE_NB_CORES * (1-(currentUtilization / 100));

        //A function instance gets up to one core of capacity or the full remaining capacity
        Double allocatedCapacity=0.0;
        if(availableCapacity-Config.DEFAULT_DEVICE_CAPACITY_PER_CORE >=0 && oneCoreAllocation){
            //At least one core is available, we allocate one core
            allocatedCapacity= (double) Config.DEFAULT_DEVICE_CAPACITY_PER_CORE;
        }
        else{
            //We allocate what is available
            allocatedCapacity=availableCapacity;
        }
        return allocatedCapacity;
    }

    private double calculateWeight(Device source, Device destination){
        //For this scenario the weight is the latency calculated as the distance between the nodes divided by 100
        double distance = calculateDistance(source.getLocationInformation(),destination.getLocationInformation())/100;
        return distance;
    }

    public double calculateDistance(Location loc1, Location loc2) {

        final int R = 6371; // Radius of the earth in Kilometers

        double latDistance = Math.toRadians(loc1.latitude - loc2.latitude);
        double lonDistance = Math.toRadians(loc1.longitude - loc2.longitude);
        double a = Math.sin(latDistance / 2) * Math.sin(latDistance / 2)
                + Math.cos(Math.toRadians(loc1.latitude)) * Math.cos(Math.toRadians(loc2.latitude))
                * Math.sin(lonDistance / 2) * Math.sin(lonDistance / 2);
        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
        double distance = R * c; // kms


        distance = Math.pow(distance, 2);

        return Math.sqrt(distance);
    }

    private double getLinkLatency(String startDeviceName, String endDeviceName){
        Device startDevice=nameToDevice.get(startDeviceName);
        Device endDevice=nameToDevice.get(endDeviceName);
        ShortestPathAlgorithm.SingleSourcePaths<Device, DefaultWeightedEdge> iPaths = dijkstraAlg.getPaths(startDevice);
        GraphPath<Device, DefaultWeightedEdge> pathToDestination = iPaths.getPath(endDevice);

        //Calculate the latency of the path by summing the edge latency of its edges
        double totalLatency = 0;
        for (DefaultWeightedEdge link : pathToDestination.getEdgeList()){
            totalLatency+=graph.getEdgeWeight(link);
        }
        //Calculate latency
        return totalLatency;
    }

    /*private double getDynamicPowerForUtilization(double utilizationWithServicePlaced, double dynPower){
        //We consider a linear model were the dynamic power part is 0 at 0% utilization (OBS it still has idle power but this is another constant)
        // and Dyn power att 100% utilization
        //utilization in percentage
        return dynPower*(utilizationWithServicePlaced/100);
    }*/ //TODO Move to a new Linear energy model class

    public double getLinkEnergyConsumption(String startFunctionInstanceName, String destinationFunctionInstanceName,
                                           String startLocation, String destinationLocation){
        // 0 - Get names
        String startDeviceName;
        if (startFunctionInstanceName==Utils.START){
            startDeviceName=startLocation;
        }
        else if (startFunctionInstanceName==Utils.END){
            startDeviceName=destinationLocation;
        }
        else{
            Pair<String,String> startSplit = Utils.splitLongFunctionInstanceName(startFunctionInstanceName);
            startDeviceName= startSplit.getKey();
        }
        String destinationDeviceName;
        if (destinationFunctionInstanceName==Utils.END){
            destinationDeviceName = destinationLocation;
        }
        else if (destinationFunctionInstanceName==Utils.START){
            destinationDeviceName = startLocation;
        }
        else{
            Pair<String,String> destinationSplit = Utils.splitLongFunctionInstanceName(destinationFunctionInstanceName);
            destinationDeviceName= destinationSplit.getKey();
        }

        Double currentUtilization = utilization.get(startDeviceName + "=>" + destinationDeviceName);

        // 1- get the linkTiming
        double linkTiming=getLinkTransmissionTime(startFunctionInstanceName,destinationFunctionInstanceName);

        // 2 - Check whether we already have calculated the energy
        double energy_link;
        if(energy_links.get(startFunctionInstanceName + "=>" + destinationFunctionInstanceName)!= null) {
            energy_link=energy_links.get(startFunctionInstanceName + "=>" + destinationFunctionInstanceName);
        }
        else {
            //We need to calculate it

            //Get Pidle
            int p_link_idle = Config.DEFAULT_LINK_P_IDLE;
            //GetPdyn
            int p_link_dyn = Config.DEFAULT_LINK_P_DYN;
            //Calculate energy
            energy_link = p_link_idle * linkTiming + p_link_dyn * linkTiming;

            //Add to Map variables
            energy_links.put(startFunctionInstanceName + "=>" + destinationFunctionInstanceName, energy_link);
        }
        return energy_link;
    }

    public double getLinkMarginalEnergyConsumption(String startFunctionInstanceName, String destinationFunctionInstanceName,
                                                   String startLocation, String destinationLocation){
        // 0 - Get names
        String startDeviceName;
        if (startFunctionInstanceName==Utils.START){
            startDeviceName=startLocation;
        }
        else if (startFunctionInstanceName==Utils.END){
            startDeviceName=destinationLocation;
        }
        else{
            Pair<String,String> startSplit = Utils.splitLongFunctionInstanceName(startFunctionInstanceName);
            startDeviceName= startSplit.getKey();
        }
        String destinationDeviceName;
        if (destinationFunctionInstanceName==Utils.END){
            destinationDeviceName = destinationLocation;
        }
        else if (destinationFunctionInstanceName==Utils.START){
            destinationDeviceName = startLocation;
        }
        else{
            Pair<String,String> destinationSplit = Utils.splitLongFunctionInstanceName(destinationFunctionInstanceName);
            destinationDeviceName= destinationSplit.getKey();
        }

        double linkTiming=getLinkTransmissionTime(startFunctionInstanceName,destinationFunctionInstanceName);

        // 2 - Check whether we already have calculated the residual energy
        double energy_residual_link;
        if(energy_residual_links.get(startFunctionInstanceName + "=>" + destinationFunctionInstanceName)!= null) {
            energy_residual_link=energy_residual_links.get(startFunctionInstanceName + "=>" + destinationFunctionInstanceName);
        }
        else {
            //We need to calculate it
            //First check if the timing is 0 (self loop)
            if (linkTiming==0.0){
                energy_residual_link=0.0;
            }else {
                //Get Pidle
                int p_link_idle = Config.DEFAULT_LINK_P_IDLE;
                //GetPdyn
                int p_link_dyn = Config.DEFAULT_LINK_P_DYN;
                //Calculate residual energy
                energy_residual_link = p_link_idle * linkTiming + p_link_dyn * linkTiming;
            }
            //Add to Map variables
            energy_residual_links.put(startFunctionInstanceName + "=>" + destinationFunctionInstanceName, energy_residual_link);
        }
        return energy_residual_link;
    }

    public double getInstanceEnergyConsumption(String functionInstanceName){
        // 1- Getting the hardware name
        Pair<String, String> nameSplit = Utils.splitLongFunctionInstanceName(functionInstanceName);
        String deviceName = nameSplit.getKey();

        //Check whether we already have info about this
        double energy_consumption;
        if(energy_devices.get(functionInstanceName)!=null){
            energy_consumption=energy_devices.get(functionInstanceName);
        }else{
            //We need to calculate it

            //Get execution time
            double deviceTiming=getExecutionTime(deviceName,nameSplit.getValue());

            //Get Pidle
            int p_device_idle = Config.DEFAULT_DEVICE_P_IDLE;

            //Calculate utilization after allocation
            double utilizationAfterAllocation = calculateUtilizationAfterAllocation(deviceName);

            //Calculate energy
            energy_consumption = p_device_idle * deviceTiming + energyModel.getDynamicPowerForUtilization(utilizationAfterAllocation) * deviceTiming;

            if(energy_consumption <0){
                System.out.println("PRoblem");
            }

            //Add to Map variables
            energy_devices.put(functionInstanceName, energy_consumption);
        }
        return energy_consumption;
    }

    private double calculateUtilizationAfterAllocation(String device){
        Double currentUtilization = utilization.get(device);
        Double allocatedCapacity = getAllocatedCapacity(currentUtilization);

        //Calculate share of utilization of this allocated capacity
        Double allocatedUtilization= allocatedCapacity/(Config.DEFAULT_DEVICE_CAPACITY_PER_CORE*Config.DEFAULT_DEVICE_NB_CORES)*100; //In percentage

        return currentUtilization+allocatedUtilization;
    }

    public double getInstanceMarginalEnergyConsumption(String functionInstanceName){
        // 1- Getting the hardware name
        Pair<String, String> nameSplit = Utils.splitLongFunctionInstanceName(functionInstanceName);
        String deviceName = nameSplit.getKey();

        //Check whether we already have info about this
        double energy_marginal_consumption;
        if(energy_residual_devices.get(functionInstanceName)!=null){
            energy_marginal_consumption =energy_residual_devices.get(functionInstanceName);
        }else{
            //We need to calculate it

            //Get execution time
            double deviceTiming=getExecutionTime(deviceName,nameSplit.getValue());

            //Get Pidle
            int p_device_idle = Config.DEFAULT_DEVICE_P_IDLE;

            //Calculate utilization after allocation
            double utilizationAfterAllocation = calculateUtilizationAfterAllocation(deviceName);

            //Get utilization value for this device
            Double beforeUtilization = utilization.get(deviceName);
            if (beforeUtilization == 0) {
                energy_marginal_consumption = p_device_idle * deviceTiming + energyModel.getDynamicPowerForUtilization(utilizationAfterAllocation) * deviceTiming;
            } else {
                //How much power does the utilization increase due to the placement requires?
                double powerIncrease = energyModel.getDynamicPowerForUtilization(utilizationAfterAllocation) - energyModel.getDynamicPowerForUtilization(beforeUtilization);

                energy_marginal_consumption = powerIncrease * deviceTiming; //Only the dynamic part
            }

            //Add to Map variables
            energy_residual_devices.put(functionInstanceName, energy_marginal_consumption);
        }
        return energy_marginal_consumption;
    }

        public void evaluatePlacementOutput(RequestPlacementOutput output, String startLocationMathematical, String endLocationMathematical){

        if(output==null){
            System.out.println("No evaluation of the placement, request was infeasible");
        }else {
            List<String> elementsToCalculateTime = output.getElementsForTiming();
            Map<String, String> placement = output.getAppFunctionToDevice();

            for (String element : elementsToCalculateTime) {
                if (Utils.isLink(element)) {
                    //It is a link

                    //Get start and end device
                    Pair<String, String> devices = Utils.getLinkStartAndEndDevices(element);
                    //Get utilization value for this link
                    if (devices.getKey().equals(Utils.START)) {
                        //In our setup the start device=end device=the current device
                        String endDevice = devices.getValue();
                        devices = new Pair<>(startLocationMathematical, endDevice);
                    }
                    if (devices.getValue().equals(Utils.END)) {
                        //In our setup the start device=end device=the current device
                        String startDevice = devices.getKey();
                        devices = new Pair<>(startDevice, endLocationMathematical);
                    }

                    //We should have already calculated the value when the optimizer picked it
                    Double linkTiming = time_links.get(element);
                    if (linkTiming == null) {
                        System.out.println("ERROR link timing value not available");
                    }

                    //We should have already calculated the value when the optimizer picked it
                    Double energy_link = energy_links.get(element);
                    if (energy_link == null) {
                        System.out.println("ERROR link energy value not available");
                    }

                    Double energy_residual_link = energy_residual_links.get(element);
                    if (energy_residual_link == null) {
                        //Calculate it
                        Pair<String, String> linkSplit = Utils.splitLinkName(element);
                        getLinkMarginalEnergyConsumption(linkSplit.getKey(), linkSplit.getValue(), startLocationMathematical, endLocationMathematical);
                    }

                } else {
                    //It is a node
                    //Get device name and function instance name
                    Pair<String, String> deviceAndFunction = Utils.splitLongFunctionInstanceName(element);

                    //We should have already calculated the value when the optimizer picked it
                    Double deviceTiming = time_devices.get(element);
                    if (deviceTiming == null) {
                        System.out.println("ERROR device timing value not available");
                    }

                    //We should have already calculated the value when the optimizer picked it
                    Double energy_device = energy_devices.get(element);
                    if (energy_device == null) {
                        System.out.println("ERROR device energy value not available");
                    }

                    Double energy_residual_device = energy_residual_devices.get(element);
                    if (energy_residual_device == null) {
                        //Calculate it
                        getInstanceMarginalEnergyConsumption(element);
                    }
                }
            }
            //Calculate the total - sum over the elements
            double timeLink = 0;
            double timeDevice = 0;
            double timeLinkDevice = 0;
            for (String element : elementsToCalculateTime) {
                if (Utils.isLink(element)) {
                    timeLink += time_links.get(element);
                } else {
                    timeDevice += time_devices.get(element);
                }
            }
            timeLinkDevice = timeLink + timeDevice;

            double energyLink = 0;
            double energyDevice = 0;
            double energyLinkDevice = 0;
            for (String element : elementsToCalculateTime) {
                if (Utils.isLink(element)) {
                    energyLink += energy_links.get(element);
                } else {
                    energyDevice += energy_devices.get(element);
                }
            }
            energyLinkDevice = energyLink + energyDevice;

            double energyResLink = 0;
            double energyResDevice = 0;
            double energyResLinkDevice = 0;
            for (String element : elementsToCalculateTime) {
                if (Utils.isLink(element)) {
                    energyResLink += energy_residual_links.get(element);
                } else {
                    energyResDevice += energy_residual_devices.get(element);
                }
            }
            energyResLinkDevice = energyResLink + energyResDevice;

            //Print the results in a usable way
            System.out.println("Evaluated placement: Completion time " + timeLinkDevice + " Overall energy " + energyLinkDevice + " Marginal energy " + energyResLinkDevice + " In details - completion time link "+ timeLink + " completion time device " + timeDevice + " overall energy link " + energyLink + " overall energy device " + energyDevice + " marginal energy link "+energyResLink + " marginal energy device "+energyResDevice);
        }
    }

    private static Device createEdgeDevice(String nodeName, long mips,
                                           String deviceType) {

         Device edgedevice = null;
        try {
            edgedevice = new Device(nodeName, deviceType,mips);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return edgedevice;
    }

    public void clear(){
        time_devices.clear();
        time_links.clear();
        energy_links.clear();
        energy_devices.clear();
        energy_residual_links.clear();
        energy_residual_devices.clear();
    }

    public void createUtilizationData(int scenarioIndex, int repetitionNumber, Boolean usingUniformLoadDistribution,int standardDeviation, Boolean linksAreLoaded){
        //First create a list of all element that need to have information
        //Devices
        List<String> deviceNames = new ArrayList<>();
        for (Device device : edgeDevices) {
            if (device.getName().contains("gateway")) {//Note: with current setup should be all of them so this is only to double check
                deviceNames.add(device.getName());
            }
        }
        //Links
        List<String> linkNames = new ArrayList<>();
        for (String device1 : deviceNames) {
            for (String device2 : deviceNames) {
                if (!device1.equals(device2)) {
                    //Self loops are not interesting
                    linkNames.add(device1 + "=>" + device2);
                }
            }
        }

        //Non-uniform
        Distribution utilizationDistribution = new NormalDistribution(scenarioIndex * 10, standardDeviation, Config.SEED +repetitionNumber+scenarioIndex);

        //Then create the information
        utilization = new HashMap<>();
        for (String element : deviceNames) {
            //Get a value from the chosen distribution
            //For this scenario - not random
            Double randomUtil = utilizationDistribution.getNextValue();
            if (randomUtil < 0) {
                randomUtil = 0.0;
            }
            if (randomUtil > 100) {
                randomUtil = 100.0;
            }
            if(usingUniformLoadDistribution){
                randomUtil= scenarioIndex*10.0;
            }
            utilization.put(element, randomUtil);
        }
        for (String element : linkNames) {
            //Get a value from the chosen distribution
            //For this scenario - not random
            Double randomUtil = utilizationDistribution.getNextValue();
            if (randomUtil <0){
                randomUtil=0.0;
            }
            if (randomUtil >100){
                randomUtil=100.0;
            }
            //Not random variant
            if(!linksAreLoaded){
                randomUtil = 0.0;
            }
            utilization.put(element, randomUtil);
        }
        System.out.println(utilization);
    }

    public List<Device> getEdgeDevices(){
        return edgeDevices;
    }

    // Used for the random beginning device case
    public void modifyPlacingDevice(String newPlacingDevice){
        this.placingDevice=newPlacingDevice;
    }
}