124 lines
5.3 KiB
Java
124 lines
5.3 KiB
Java
/*
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* Title: EdgeCloudSim - Nomadic Mobility model implementation
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*
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* Description:
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* MobilityModel implements basic nomadic mobility model where the
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* place of the devices are changed from time to time instead of a
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* continuous location update.
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*
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* Licence: GPL - http://www.gnu.org/copyleft/gpl.html
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* Copyright (c) 2017, Bogazici University, Istanbul, Turkey
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*/
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package edu.boun.edgecloudsim.mobility;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.TreeMap;
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import java.util.Map.Entry;
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import org.apache.commons.math3.distribution.ExponentialDistribution;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import edu.boun.edgecloudsim.core.SimSettings;
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import edu.boun.edgecloudsim.utils.Location;
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import edu.boun.edgecloudsim.utils.SimLogger;
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import edu.boun.edgecloudsim.utils.SimUtils;
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public class NomadicMobility extends MobilityModel {
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private List<TreeMap<Double, Location>> treeMapArray;
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public NomadicMobility(int _numberOfMobileDevices, double _simulationTime) {
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super(_numberOfMobileDevices, _simulationTime);
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// TODO Auto-generated constructor stub
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}
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@Override
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public void initialize() {
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treeMapArray = new ArrayList<TreeMap<Double, Location>>();
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ExponentialDistribution[] expRngList = new ExponentialDistribution[SimSettings.getInstance().getNumOfEdgeDatacenters()];
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//create random number generator for each place
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Document doc = SimSettings.getInstance().getEdgeDevicesDocument();
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NodeList datacenterList = doc.getElementsByTagName("datacenter");
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for (int i = 0; i < datacenterList.getLength(); i++) {
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Node datacenterNode = datacenterList.item(i);
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Element datacenterElement = (Element) datacenterNode;
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Element location = (Element)datacenterElement.getElementsByTagName("location").item(0);
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String attractiveness = location.getElementsByTagName("attractiveness").item(0).getTextContent();
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int placeTypeIndex = Integer.parseInt(attractiveness);
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expRngList[i] = new ExponentialDistribution(SimSettings.getInstance().getMobilityLookUpTable()[placeTypeIndex]);
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}
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//initialize tree maps and position of mobile devices
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for(int i=0; i<numberOfMobileDevices; i++) {
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treeMapArray.add(i, new TreeMap<Double, Location>());
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int randDatacenterId = SimUtils.getRandomNumber(0, SimSettings.getInstance().getNumOfEdgeDatacenters()-1);
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Node datacenterNode = datacenterList.item(randDatacenterId);
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Element datacenterElement = (Element) datacenterNode;
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Element location = (Element)datacenterElement.getElementsByTagName("location").item(0);
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String attractiveness = location.getElementsByTagName("attractiveness").item(0).getTextContent();
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int placeTypeIndex = Integer.parseInt(attractiveness);
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int wlan_id = Integer.parseInt(location.getElementsByTagName("wlan_id").item(0).getTextContent());
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int x_pos = Integer.parseInt(location.getElementsByTagName("x_pos").item(0).getTextContent());
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int y_pos = Integer.parseInt(location.getElementsByTagName("y_pos").item(0).getTextContent());
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//start locating user shortly after the simulation started (e.g. 10 seconds)
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treeMapArray.get(i).put(SimSettings.CLIENT_ACTIVITY_START_TIME, new Location(placeTypeIndex, wlan_id, x_pos, y_pos));
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}
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for(int i=0; i<numberOfMobileDevices; i++) {
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TreeMap<Double, Location> treeMap = treeMapArray.get(i);
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while(treeMap.lastKey() < SimSettings.getInstance().getSimulationTime()) {
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boolean placeFound = false;
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int currentLocationId = treeMap.lastEntry().getValue().getServingWlanId();
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double waitingTime = expRngList[currentLocationId].sample();
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while(placeFound == false){
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int newDatacenterId = SimUtils.getRandomNumber(0,SimSettings.getInstance().getNumOfEdgeDatacenters()-1);
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if(newDatacenterId != currentLocationId){
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placeFound = true;
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Node datacenterNode = datacenterList.item(newDatacenterId);
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Element datacenterElement = (Element) datacenterNode;
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Element location = (Element)datacenterElement.getElementsByTagName("location").item(0);
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String attractiveness = location.getElementsByTagName("attractiveness").item(0).getTextContent();
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int placeTypeIndex = Integer.parseInt(attractiveness);
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int wlan_id = Integer.parseInt(location.getElementsByTagName("wlan_id").item(0).getTextContent());
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int x_pos = Integer.parseInt(location.getElementsByTagName("x_pos").item(0).getTextContent());
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int y_pos = Integer.parseInt(location.getElementsByTagName("y_pos").item(0).getTextContent());
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treeMap.put(treeMap.lastKey()+waitingTime, new Location(placeTypeIndex, wlan_id, x_pos, y_pos));
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}
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}
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if(!placeFound){
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SimLogger.printLine("impossible is occurred! location cannot be assigned to the device!");
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System.exit(0);
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}
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}
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}
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}
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@Override
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public Location getLocation(int deviceId, double time) {
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TreeMap<Double, Location> treeMap = treeMapArray.get(deviceId);
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Entry<Double, Location> e = treeMap.floorEntry(time);
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if(e == null){
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SimLogger.printLine("impossible is occurred! no location is found for the device '" + deviceId + "' at " + time);
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System.exit(0);
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}
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return e.getValue();
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}
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}
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