code refactoring and improvements

* saving log for each app type support
* colt library is used for poisson distribution
* Setting file structure is updated
* some bug fixes are applied
* new abstract functions are added to network manager for another
experimental study

src/edu/boun/edgecloudsim/core/SimSettings.java

@@ -37,7 +37,7 @@ public class SimSettings {
 	//if you want to add different types on your config file,
 	//you may modify current types or add new types here. 
 	public static enum VM_TYPES { EDGE_VM, CLOUD_VM }
-	public static enum APP_TYPES { FACE_REC_APP, HEALTH_APP, HEAVY_COMP_APP, VIDEO_GAME_APP, SIMPLE_SERVICE_APP }
+	public static enum APP_TYPES { AUGMENTED_REALITY, HEALTH_APP, HEAVY_COMP_APP, INFOTAINMENT_APP }
 	public static enum PLACE_TYPES { ATTRACTIVENESS_L1, ATTRACTIVENESS_L2, ATTRACTIVENESS_L3 }
 	
 	//predifined IDs for cloud components.
@@ -52,10 +52,10 @@ public class SimSettings {
 	//delimiter for output file.
 	public static String DELIMITER = ";";
 	
-    private double SIMULATION_TIME; //hours unit in properties file
+    private double SIMULATION_TIME; //minutes unit in properties file
-    private double WARM_UP_PERIOD; //seconds unit in properties file
+    private double WARM_UP_PERIOD; //minutes unit in properties file
-    private double INTERVAL_TO_GET_VM_LOAD_LOG; //seconds unit in properties file
+    private double INTERVAL_TO_GET_VM_LOAD_LOG; //minutes unit in properties file
-    private double INTERVAL_TO_GET_VM_LOCATION_LOG; //seconds unit in properties file
+    private double INTERVAL_TO_GET_VM_LOCATION_LOG; //minutes unit in properties file
     private boolean FILE_LOG_ENABLED; //boolean to check file logging option
     private boolean DEEP_FILE_LOG_ENABLED; //boolean to check deep file logging option
 
@@ -92,7 +92,7 @@ public class SimSettings {
     // [7] avg task length (MI)
     // [8] required # of cores
     // [9] vm utilization (%)
-    private double[][] taskLookUpTable = new double[APP_TYPES.values().length][10];
+    private double[][] taskLookUpTable = new double[APP_TYPES.values().length][11];
 
 	private SimSettings() {
 	}
@@ -119,10 +119,10 @@ public class SimSettings {
 			Properties prop = new Properties();
 			prop.load(input);
 
-			SIMULATION_TIME = 3600 * Double.parseDouble(prop.getProperty("simulation_time")); //hours
+			SIMULATION_TIME = (double)60 * Double.parseDouble(prop.getProperty("simulation_time")); //seconds
-			WARM_UP_PERIOD = Double.parseDouble(prop.getProperty("warm_up_period")); //seconds
+			WARM_UP_PERIOD = (double)60 * Double.parseDouble(prop.getProperty("warm_up_period")); //seconds
-			INTERVAL_TO_GET_VM_LOAD_LOG = Double.parseDouble(prop.getProperty("vm_load_check_interval")); //seconds
+			INTERVAL_TO_GET_VM_LOAD_LOG = (double)60 * Double.parseDouble(prop.getProperty("vm_load_check_interval")); //seconds
-			INTERVAL_TO_GET_VM_LOCATION_LOG = Double.parseDouble(prop.getProperty("vm_location_check_interval")); //seconds
+			INTERVAL_TO_GET_VM_LOCATION_LOG = (double)60 * Double.parseDouble(prop.getProperty("vm_location_check_interval")); //seconds
 			FILE_LOG_ENABLED = Boolean.parseBoolean(prop.getProperty("file_log_enabled"));
 			DEEP_FILE_LOG_ENABLED = Boolean.parseBoolean(prop.getProperty("deep_file_log_enabled"));
 			
@@ -185,7 +185,7 @@ public class SimSettings {
 
 
 	/**
-	 * returns simulation time (in hours unit) from properties file
+	 * returns simulation time (in seconds unit) from properties file
 	 */
 	public double getSimulationTime()
 	{
@@ -430,9 +430,10 @@ public class SimSettings {
 				double task_length = Double.parseDouble(appElement.getElementsByTagName("task_length").item(0).getTextContent());
 				double required_core = Double.parseDouble(appElement.getElementsByTagName("required_core").item(0).getTextContent());
 				double vm_utilization = Double.parseDouble(appElement.getElementsByTagName("vm_utilization").item(0).getTextContent());
+				double delay_sensitivity = Double.parseDouble(appElement.getElementsByTagName("delay_sensitivity").item(0).getTextContent());
 				
-			    taskLookUpTable[appType.ordinal()][0] = usage_percentage; //usage percentage (%)
+			    taskLookUpTable[appType.ordinal()][0] = usage_percentage; //usage percentage [0-100]
-			    taskLookUpTable[appType.ordinal()][1] = prob_cloud_selection; //prob. of selecting cloud (%)
+			    taskLookUpTable[appType.ordinal()][1] = prob_cloud_selection; //prob. of selecting cloud [0-100]
 			    taskLookUpTable[appType.ordinal()][2] = poisson_interarrival; //poisson mean (sec)
 			    taskLookUpTable[appType.ordinal()][3] = active_period; //active period (sec)
 			    taskLookUpTable[appType.ordinal()][4] = idle_period; //idle period (sec)
@@ -440,7 +441,8 @@ public class SimSettings {
 			    taskLookUpTable[appType.ordinal()][6] = data_download; //avg data download (KB)
 			    taskLookUpTable[appType.ordinal()][7] = task_length; //avg task length (MI)
 			    taskLookUpTable[appType.ordinal()][8] = required_core; //required # of core
-			    taskLookUpTable[appType.ordinal()][9] = vm_utilization; //vm utilization (%)
+			    taskLookUpTable[appType.ordinal()][9] = vm_utilization; //vm utilization [0-100]
+			    taskLookUpTable[appType.ordinal()][10] = delay_sensitivity; //delay_sensitivity [0-1]
 			}
 	
 		} catch (Exception e) {

src/edu/boun/edgecloudsim/edge_client/MobileDeviceManager.java

@@ -38,7 +38,7 @@ public class MobileDeviceManager extends DatacenterBroker {
 	private static final int REQUEST_PROCESSED_BY_CLOUD = BASE + 2;
 	private static final int REQUEST_RECIVED_BY_EDGE_DEVICE = BASE + 3;
 	private static final int RESPONSE_RECEIVED_BY_MOBILE_DEVICE = BASE + 4;
-	private static final int REQUEST_RECIVED_BY_EDGE_ORCHESTRATOR = BASE + 5;
+//	private static final int REQUEST_RECIVED_BY_EDGE_ORCHESTRATOR = BASE + 5;
 	private int taskIdCounter=0;
 	
 	public MobileDeviceManager() throws Exception {
@@ -70,9 +70,10 @@ public class MobileDeviceManager extends DatacenterBroker {
 		if(task.getSubmittedLocation().equals(currentLocation))
 		{
 			//SimLogger.printLine(CloudSim.clock() + ": " + getName() + ": Cloudlet " + task.getCloudletId() + " received");
-			double WlanDelay = networkModel.getDownloadDelay(task.getAssociatedHostId(), task.getMobileDeviceId());
+			double WlanDelay = networkModel.getDownloadDelay(task.getAssociatedHostId(), task.getMobileDeviceId(), task.getCloudletOutputSize());
 			if(WlanDelay > 0)
 			{
+				networkModel.downloadStarted(currentLocation, SimSettings.GENERIC_EDGE_DEVICE_ID);
 				schedule(getId(), WlanDelay, RESPONSE_RECEIVED_BY_MOBILE_DEVICE, task);
 				SimLogger.getInstance().downloadStarted(task.getCloudletId(), WlanDelay);
 			}
@@ -103,9 +104,9 @@ public class MobileDeviceManager extends DatacenterBroker {
 			{
 				Task task = (Task) ev.getData();
 				
-				Location currentLocation = SimManager.getInstance().getMobilityModel().getLocation(task.getMobileDeviceId(),CloudSim.clock());
+				networkModel.uploadFinished(task.getSubmittedLocation(), SimSettings.CLOUD_DATACENTER_ID);
 				
-				task.setSubmittedLocation(currentLocation);
+				//save related host id
 				task.setAssociatedHostId(SimSettings.CLOUD_HOST_ID);
 				
 				SimLogger.getInstance().uploaded(task.getCloudletId(),
@@ -125,54 +126,70 @@ public class MobileDeviceManager extends DatacenterBroker {
 			{
 				Task task = (Task) ev.getData();
 
-				Location currentLocation = SimManager.getInstance().getMobilityModel().getLocation(task.getMobileDeviceId(),CloudSim.clock());
+				//SimLogger.printLine(CloudSim.clock() + ": " + getName() + ": Cloudlet " + task.getCloudletId() + " received");
-				
+				double WanDelay = networkModel.getDownloadDelay(SimSettings.CLOUD_DATACENTER_ID, task.getMobileDeviceId(), task.getCloudletOutputSize());
-				if(task.getSubmittedLocation().equals(currentLocation))
+				if(WanDelay > 0)
 				{
-					//SimLogger.printLine(CloudSim.clock() + ": " + getName() + ": Cloudlet " + task.getCloudletId() + " received");
+					Location currentLocation = SimManager.getInstance().getMobilityModel().getLocation(task.getMobileDeviceId(),CloudSim.clock()+WanDelay);
-					double WanDelay = networkModel.getDownloadDelay(SimSettings.CLOUD_DATACENTER_ID, task.getMobileDeviceId());
+					if(task.getSubmittedLocation().equals(currentLocation))
-					if(WanDelay > 0)
 					{
+						networkModel.downloadStarted(task.getSubmittedLocation(), SimSettings.CLOUD_DATACENTER_ID);
 						schedule(getId(), WanDelay, RESPONSE_RECEIVED_BY_MOBILE_DEVICE, task);
 						SimLogger.getInstance().downloadStarted(task.getCloudletId(), WanDelay);
 					}
 					else
 					{
-						SimLogger.getInstance().failedDueToBandwidth(task.getCloudletId(), CloudSim.clock());
+						//SimLogger.printLine("task cannot be finished due to mobility of user!");
+						//SimLogger.printLine("device: " +task.getMobileDeviceId()+" - submitted " + task.getSubmissionTime() + " @ " + task.getSubmittedLocation().getXPos() + " handled " + CloudSim.clock() + " @ " + currentLocation.getXPos());
+						SimLogger.getInstance().failedDueToMobility(task.getCloudletId(), CloudSim.clock());
 					}
 				}
 				else
 				{
-					//SimLogger.printLine("task cannot be finished due to mobility of user!");
+					SimLogger.getInstance().failedDueToBandwidth(task.getCloudletId(), CloudSim.clock());
-					//SimLogger.printLine("device: " +task.getMobileDeviceId()+" - submitted " + task.getSubmissionTime() + " @ " + task.getSubmittedLocation().getXPos() + " handled " + CloudSim.clock() + " @ " + currentLocation.getXPos());
-					SimLogger.getInstance().failedDueToMobility(task.getCloudletId(), CloudSim.clock());
 				}
-				
 				break;
 			}
+			/*
 			case REQUEST_RECIVED_BY_EDGE_ORCHESTRATOR:
 			{
 				Task task = (Task) ev.getData();
 				double internalDelay = networkModel.getDownloadDelay(
 						SimSettings.EDGE_ORCHESTRATOR_ID,
-						SimSettings.GENERIC_EDGE_DEVICE_ID);
+						SimSettings.GENERIC_EDGE_DEVICE_ID,
+						task.getCloudletOutputSize());
+						
+				networkModel.downloadStarted(
+						SimSettings.EDGE_ORCHESTRATOR_ID,
+						SimSettings.GENERIC_EDGE_DEVICE_ID,
+						task.getCloudletOutputSize());
 
 				submitTaskToEdgeDevice(task,internalDelay);
 
 				break;
 			}
+			*/
 			case REQUEST_RECIVED_BY_EDGE_DEVICE:
 			{
 				Task task = (Task) ev.getData();
+				
+				networkModel.uploadFinished(task.getSubmittedLocation(), SimSettings.GENERIC_EDGE_DEVICE_ID);
+				
 				submitTaskToEdgeDevice(task,0);
 				
 				break;
 			}
 			case RESPONSE_RECEIVED_BY_MOBILE_DEVICE:
 			{
-				Cloudlet cloudlet = (Cloudlet) ev.getData();
+				Task task = (Task) ev.getData();
+				
+				if(task.getAssociatedHostId() == SimSettings.CLOUD_HOST_ID)
+					networkModel.downloadFinished(task.getSubmittedLocation(), SimSettings.CLOUD_DATACENTER_ID);
+				else
+					networkModel.downloadFinished(task.getSubmittedLocation(), SimSettings.GENERIC_EDGE_DEVICE_ID);
+				
 				//SimLogger.printLine(CloudSim.clock() + ": " + getName() + ": Cloudlet " + cloudlet.getCloudletId() + " is received");
-				SimLogger.getInstance().downloaded(cloudlet.getCloudletId(), CloudSim.clock());
+				SimLogger.getInstance().downloaded(task.getCloudletId(), CloudSim.clock());
 				break;
 			}
 			default:
@@ -187,11 +204,7 @@ public class MobileDeviceManager extends DatacenterBroker {
 		EdgeVM selectedVM = SimManager.getInstance().getEdgeOrchestrator().getVmToOffload(task);
 		
 		if(selectedVM != null){
-			Location currentLocation = SimManager.getInstance().getMobilityModel().
+			//save related host id
-					getLocation(task.getMobileDeviceId(),CloudSim.clock());
-			
-			//save task info
-			task.setSubmittedLocation(currentLocation);
 			task.setAssociatedHostId(selectedVM.getHost().getId());
 			
 			//bind task to related VM
@@ -219,6 +232,12 @@ public class MobileDeviceManager extends DatacenterBroker {
 		//create a task
 		Task task = createTask(edgeTask);
 		
+		Location currentLocation = SimManager.getInstance().getMobilityModel().
+				getLocation(task.getMobileDeviceId(),CloudSim.clock());
+		
+		//set location of the mobile device which generates this task
+		task.setSubmittedLocation(currentLocation);
+
 		//add related task to log list
 		SimLogger.getInstance().addLog(CloudSim.clock(),
 				task.getCloudletId(),
@@ -230,38 +249,50 @@ public class MobileDeviceManager extends DatacenterBroker {
 		int nextHopId = SimManager.getInstance().getEdgeOrchestrator().getDeviceToOffload(task);
 		
 		if(nextHopId == SimSettings.CLOUD_DATACENTER_ID){
-			double WanDelay = networkModel.getUploadDelay(task.getMobileDeviceId(), nextHopId);
+			double WanDelay = networkModel.getUploadDelay(task.getMobileDeviceId(), nextHopId, task.getCloudletFileSize());
 			
 			if(WanDelay>0){
+				networkModel.uploadStarted(currentLocation, nextHopId);
 				schedule(getId(), WanDelay, REQUEST_RECEIVED_BY_CLOUD, task);
 				SimLogger.getInstance().uploadStarted(task.getCloudletId(),WanDelay);
 			}
 			else
 			{
 				//SimLogger.printLine("Task #" + task.getCloudletId() + " cannot assign to any VM");
-				SimLogger.getInstance().rejectedDueToBandwidth(task.getCloudletId(), CloudSim.clock());
+				SimLogger.getInstance().rejectedDueToBandwidth(
-			}
+						task.getCloudletId(),
-		}
+						CloudSim.clock(),
-		else if(nextHopId == SimSettings.EDGE_ORCHESTRATOR_ID){
+						SimSettings.VM_TYPES.CLOUD_VM.ordinal());
-			double WlanDelay = networkModel.getUploadDelay(task.getMobileDeviceId(), nextHopId);
-			
-			if(WlanDelay > 0){
-				schedule(getId(), WlanDelay, REQUEST_RECIVED_BY_EDGE_ORCHESTRATOR, task);
-				SimLogger.getInstance().uploadStarted(task.getCloudletId(),WlanDelay);
-			}
-			else {
-				SimLogger.getInstance().rejectedDueToBandwidth(task.getCloudletId(), CloudSim.clock());
 			}
 		}
+//		else if(nextHopId == SimSettings.EDGE_ORCHESTRATOR_ID){
+//			double WlanDelay = networkModel.getUploadDelay(task.getMobileDeviceId(), nextHopId, task.getCloudletFileSize());
+//			
+//			if(WlanDelay > 0){
+//				networkModel.uploadStarted(task.getMobileDeviceId(), nextHopId, task.getCloudletFileSize());
+//				schedule(getId(), WlanDelay, REQUEST_RECIVED_BY_EDGE_ORCHESTRATOR, task);
+//				SimLogger.getInstance().uploadStarted(task.getCloudletId(),WlanDelay);
+//			}
+//			else {
+//				SimLogger.getInstance().rejectedDueToBandwidth(
+//						task.getCloudletId(),
+//						CloudSim.clock(),
+//						SimSettings.VM_TYPES.EDGE_VM.ordinal());
+//			}
+//		}
 		else if(nextHopId == SimSettings.GENERIC_EDGE_DEVICE_ID) {
-			double WlanDelay = networkModel.getUploadDelay(task.getMobileDeviceId(), nextHopId);
+			double WlanDelay = networkModel.getUploadDelay(task.getMobileDeviceId(), nextHopId, task.getCloudletFileSize());
 			
 			if(WlanDelay > 0){
+				networkModel.uploadStarted(currentLocation, nextHopId);
 				schedule(getId(), WlanDelay, REQUEST_RECIVED_BY_EDGE_DEVICE, task);
 				SimLogger.getInstance().uploadStarted(task.getCloudletId(),WlanDelay);
 			}
 			else {
-				SimLogger.getInstance().rejectedDueToBandwidth(task.getCloudletId(), CloudSim.clock());
+				SimLogger.getInstance().rejectedDueToBandwidth(
+						task.getCloudletId(),
+						CloudSim.clock(),
+						SimSettings.VM_TYPES.EDGE_VM.ordinal());
 			}
 		}
 		else {

src/edu/boun/edgecloudsim/edge_orchestrator/BasicEdgeOrchestrator.java

@@ -53,7 +53,7 @@ public class BasicEdgeOrchestrator extends EdgeOrchestrator {
 			if(CloudVmPicker <= SimSettings.getInstance().getTaskLookUpTable()[task.getTaskType().ordinal()][1])
 				result = SimSettings.CLOUD_DATACENTER_ID;
 			else
-				result = SimSettings.EDGE_ORCHESTRATOR_ID;
+				result = SimSettings.GENERIC_EDGE_DEVICE_ID;
 		}
 		
 		return result;

src/edu/boun/edgecloudsim/mobility/NomadicMobility.java

@@ -17,6 +17,7 @@ import java.util.List;
 import java.util.TreeMap;
 import java.util.Map.Entry;
 
+import org.apache.commons.math3.distribution.ExponentialDistribution;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
@@ -24,7 +25,6 @@ import org.w3c.dom.NodeList;
 
 import edu.boun.edgecloudsim.core.SimSettings;
 import edu.boun.edgecloudsim.utils.Location;
-import edu.boun.edgecloudsim.utils.PoissonDistr;
 import edu.boun.edgecloudsim.utils.SimLogger;
 import edu.boun.edgecloudsim.utils.SimUtils;
 
@@ -40,7 +40,7 @@ public class NomadicMobility extends MobilityModel {
 	public void initialize() {
 		treeMapArray = new ArrayList<TreeMap<Double, Location>>();
 		
-		PoissonDistr[] poissonRngList = new PoissonDistr[SimSettings.getInstance().getNumOfEdgeDatacenters()];
+		ExponentialDistribution[] expRngList = new ExponentialDistribution[SimSettings.getInstance().getNumOfEdgeDatacenters()];
 
 		//create random number generator for each place
 		Document doc = SimSettings.getInstance().getEdgeDevicesDocument();
@@ -52,7 +52,7 @@ public class NomadicMobility extends MobilityModel {
 			String attractiveness = location.getElementsByTagName("attractiveness").item(0).getTextContent();
 			SimSettings.PLACE_TYPES placeType = SimUtils.stringToPlace(attractiveness);
 			
-			poissonRngList[i] = new PoissonDistr(SimSettings.getInstance().getMobilityLookUpTable()[placeType.ordinal()]);
+			expRngList[i] = new ExponentialDistribution(SimSettings.getInstance().getMobilityLookUpTable()[placeType.ordinal()]);
 		}
 		
 		//initialize tree maps and position of mobile devices
@@ -79,7 +79,7 @@ public class NomadicMobility extends MobilityModel {
 			while(treeMap.lastKey() < SimSettings.getInstance().getSimulationTime()) {				
 				boolean placeFound = false;
 				int currentLocationId = treeMap.lastEntry().getValue().getServingWlanId();
-				double waitingTime = poissonRngList[currentLocationId].sample() * 60;
+				double waitingTime = expRngList[currentLocationId].sample();
 				
 				while(placeFound == false){
 					int newDatacenterId = SimUtils.getRandomNumber(0,SimSettings.getInstance().getNumOfEdgeDatacenters()-1);

src/edu/boun/edgecloudsim/network/MM1Queue.java

@@ -65,7 +65,7 @@ public class MM1Queue extends NetworkModel {
     * source device is always mobile device in our simulation scenarios!
     */
 	@Override
-	public double getUploadDelay(int sourceDeviceId, int destDeviceId) {
+	public double getUploadDelay(int sourceDeviceId, int destDeviceId, double dataSize) {
 		double delay = 0;
 		Location accessPointLocation = SimManager.getInstance().getMobilityModel().getLocation(sourceDeviceId,CloudSim.clock());
 
@@ -93,7 +93,7 @@ public class MM1Queue extends NetworkModel {
     * destination device is always mobile device in our simulation scenarios!
     */
 	@Override
-	public double getDownloadDelay(int sourceDeviceId, int destDeviceId) {
+	public double getDownloadDelay(int sourceDeviceId, int destDeviceId, double dataSize) {
 		//Special Case -> edge orchestrator to edge device
 		if(sourceDeviceId == SimSettings.EDGE_ORCHESTRATOR_ID &&
 				destDeviceId == SimSettings.GENERIC_EDGE_DEVICE_ID){
@@ -155,11 +155,13 @@ public class MM1Queue extends NetworkModel {
 		avgTaskSize = avgTaskSize * (double)1000; //convert from KB to Byte
 		
 		Bps = bandwidth * (double)1000 / (double)8; //convert from Kbps to Byte per seconds
-	    lamda = ((double)1/(double)PoissonMean); //task per seconds
+                lamda = ((double)1/(double)PoissonMean); //task per seconds
 		mu = Bps / avgTaskSize ; //task per seconds
 		double result = (double)1 / (mu-lamda*(double)deviceCount);
 		
-		return result + propogationDelay;
+		result += propogationDelay;
+		
+		return (result > 5) ? -1 : result;
 	}
 	
 	private double getWlanDownloadDelay(Location accessPointLocation, double time) {
@@ -193,4 +195,28 @@ public class MM1Queue extends NetworkModel {
 				avgTaskInputSize,
 				getDeviceCount(accessPointLocation, time));
 	}
+
+	@Override
+	public void uploadStarted(Location accessPointLocation, int destDeviceId) {
+		// TODO Auto-generated method stub
+		
+	}
+
+	@Override
+	public void uploadFinished(Location accessPointLocation, int destDeviceId) {
+		// TODO Auto-generated method stub
+		
+	}
+
+	@Override
+	public void downloadStarted(Location accessPointLocation, int sourceDeviceId) {
+		// TODO Auto-generated method stub
+		
+	}
+
+	@Override
+	public void downloadFinished(Location accessPointLocation, int sourceDeviceId) {
+		// TODO Auto-generated method stub
+		
+	}
 }

src/edu/boun/edgecloudsim/network/NetworkModel.java

@@ -13,6 +13,8 @@
 
 package edu.boun.edgecloudsim.network;
 
+import edu.boun.edgecloudsim.utils.Location;
+
 public abstract class NetworkModel {
 	protected int numberOfMobileDevices;
 
@@ -28,10 +30,19 @@ public abstract class NetworkModel {
     /**
     * calculates the upload delay from source to destination device
     */
-	public abstract double getUploadDelay(int sourceDeviceId, int destDeviceId);
+	public abstract double getUploadDelay(int sourceDeviceId, int destDeviceId, double dataSize);
 	
     /**
     * calculates the download delay from source to destination device
     */
-	public abstract double getDownloadDelay(int sourceDeviceId, int destDeviceId);
+	public abstract double getDownloadDelay(int sourceDeviceId, int destDeviceId, double dataSize);
+	
+    /**
+    * Mobile device manager should inform network manager about the network operation
+    * This information may be important for some network delay models
+    */
+	public abstract void uploadStarted(Location accessPointLocation, int destDeviceId);
+	public abstract void uploadFinished(Location accessPointLocation, int destDeviceId);
+	public abstract void downloadStarted(Location accessPointLocation, int sourceDeviceId);
+	public abstract void downloadFinished(Location accessPointLocation, int sourceDeviceId);
 }

src/edu/boun/edgecloudsim/sample_application/mainApp.java

@@ -50,9 +50,9 @@ public class mainApp {
 		else{
 			SimLogger.printLine("Simulation setting file, output folder and iteration number are not provided! Using default ones...");
 			String configName = "default_config";
-			configFile = "config/" + configName + ".properties";
+			configFile = "config/sample_application/" + configName + ".properties";
-			applicationsFile = "config/applications.xml";
+			applicationsFile = "config/sample_application/applications.xml";
-			edgeDevicesFile = "config/edge_devices.xml";
+			edgeDevicesFile = "config/sample_application/edge_devices.xml";
 			outputFolder = "D:/" + configName + "/ite" + iterationNumber;
 		}
 
@@ -101,9 +101,13 @@ public class mainApp {
 						// Initialize the CloudSim library
 						CloudSim.init(num_user, calendar, trace_flag, 0.01);
 						
+						// Generate EdgeCloudsim Scenario Factory
 						ScenarioFactory sampleFactory = new SampleScenarioFactory(j,SS.getSimulationTime(), orchestratorPolicy, simScenario);
 						
+						// Generate EdgeCloudSim Simulation Manager
 						SimManager manager = new SimManager(sampleFactory, j, simScenario);
+						
+						// Start simulation
 						manager.startSimulation();
 					}
 					catch (Exception e)

src/edu/boun/edgecloudsim/task_generator/IdleActiveLoadGenerator.java

@@ -20,7 +20,6 @@ import org.apache.commons.math3.distribution.ExponentialDistribution;
 import edu.boun.edgecloudsim.core.SimSettings;
 import edu.boun.edgecloudsim.core.SimSettings.APP_TYPES;
 import edu.boun.edgecloudsim.utils.EdgeTask;
-import edu.boun.edgecloudsim.utils.PoissonDistr;
 import edu.boun.edgecloudsim.utils.SimLogger;
 import edu.boun.edgecloudsim.utils.SimUtils;
 
@@ -35,16 +34,16 @@ public class IdleActiveLoadGenerator extends LoadGeneratorModel{
 		taskList = new ArrayList<EdgeTask>();
 		
 		//exponential number generator for file input size, file output size and task length
-		PoissonDistr[][] poissonRngList = new PoissonDistr[SimSettings.APP_TYPES.values().length][3];
+		ExponentialDistribution[][] expRngList = new ExponentialDistribution[SimSettings.APP_TYPES.values().length][3];
 		
 		//create random number generator for each place
 		for(int i=0; i<SimSettings.APP_TYPES.values().length; i++) {
 			if(SimSettings.getInstance().getTaskLookUpTable()[i][0] ==0)
-				break;
+				continue;
 			
-			poissonRngList[i][0] = new PoissonDistr(SimSettings.getInstance().getTaskLookUpTable()[i][5]);
+			expRngList[i][0] = new ExponentialDistribution(SimSettings.getInstance().getTaskLookUpTable()[i][5]);
-			poissonRngList[i][1] = new PoissonDistr(SimSettings.getInstance().getTaskLookUpTable()[i][6]);
+			expRngList[i][1] = new ExponentialDistribution(SimSettings.getInstance().getTaskLookUpTable()[i][6]);
-			poissonRngList[i][2] = new PoissonDistr(SimSettings.getInstance().getTaskLookUpTable()[i][7]);
+			expRngList[i][2] = new ExponentialDistribution(SimSettings.getInstance().getTaskLookUpTable()[i][7]);
 		}
 		
 		//Each mobile device utilizes an app type (task type)
@@ -87,7 +86,7 @@ public class IdleActiveLoadGenerator extends LoadGeneratorModel{
 					continue;
 				}
 				
-				taskList.add(new EdgeTask(i,randomTaskType, virtualTime, poissonRngList));
+				taskList.add(new EdgeTask(i,randomTaskType, virtualTime, expRngList));
 			}
 		}
 	}

src/edu/boun/edgecloudsim/utils/EdgeTask.java

@@ -10,6 +10,8 @@
 
 package edu.boun.edgecloudsim.utils;
 
+import org.apache.commons.math3.distribution.ExponentialDistribution;
+
 import edu.boun.edgecloudsim.core.SimSettings;
 import edu.boun.edgecloudsim.core.SimSettings.APP_TYPES;
 
@@ -20,14 +22,14 @@ public class EdgeTask {
     public int pesNumber;
     public int mobileDeviceId;
     
-    public EdgeTask(int _mobileDeviceId, APP_TYPES _taskType, double _startTime, PoissonDistr[][] poissonRngList) {
+    public EdgeTask(int _mobileDeviceId, APP_TYPES _taskType, double _startTime, ExponentialDistribution[][] expRngList) {
     	mobileDeviceId=_mobileDeviceId;
     	startTime=_startTime;
     	taskType=_taskType;
     	
-    	inputFileSize = (long)poissonRngList[_taskType.ordinal()][0].sample();
+    	inputFileSize = (long)expRngList[_taskType.ordinal()][0].sample();
-    	outputFileSize =(long)poissonRngList[_taskType.ordinal()][1].sample();
+    	outputFileSize =(long)expRngList[_taskType.ordinal()][1].sample();
-    	length = (long)poissonRngList[_taskType.ordinal()][2].sample();
+    	length = (long)expRngList[_taskType.ordinal()][2].sample();
     	
     	pesNumber = (int)SimSettings.getInstance().getTaskLookUpTable()[_taskType.ordinal()][8];
 	}

src/edu/boun/edgecloudsim/utils/PoissonDistr.java

@@ -1,7 +1,7 @@
 /*
  * Title:        EdgeCloudSim - Poisson Distribution
  * 
- * Description:  Poisson Distribution implementation
+ * Description:  Wrapper class for colt Poisson Distribution
  * 
  * Licence:      GPL - http://www.gnu.org/copyleft/gpl.html
  * Copyright (c) 2017, Bogazici University, Istanbul, Turkey
@@ -9,28 +9,16 @@
 
 package edu.boun.edgecloudsim.utils;
 
-import java.util.Random;
+import java.util.Date;
+import java.util.concurrent.TimeUnit;
+
+import cern.jet.random.Poisson;
+import cern.jet.random.engine.MersenneTwister;
+import cern.jet.random.engine.RandomEngine;
 
 public class PoissonDistr {
-    /** The num gen. */
+	Poisson poisson;
-    private final Random numGen;
+	RandomEngine engine;
-
-    /** The mean. */
-    private final double mean;
-
-    /**
-     * Creates a new exponential number generator.
-     * 
-     * @param seed the seed to be used.
-     * @param mean the mean for the distribution.
-     */
-    public PoissonDistr(long seed, double mean) {
-        if (mean <= 0.0) {
-            throw new IllegalArgumentException("Mean must be greater than 0.0");
-        }
-        numGen = new Random(seed);
-        this.mean = mean;
-    }
 
     /**
      * Creates a new exponential number generator.
@@ -38,11 +26,17 @@ public class PoissonDistr {
      * @param mean the mean for the distribution.
      */
     public PoissonDistr(double mean) {
-        if (mean <= 0.0) {
+		engine = new MersenneTwister(new Date());
-            throw new IllegalArgumentException("Mean must be greated than 0.0");
+		poisson = new Poisson(mean, engine);
-        }
+		
-        numGen = new Random(System.currentTimeMillis());
+		//always sleep for some milliseconds in order not to have same seed for iterative PoissonDistr contruction
-        this.mean = mean;
+		try {
+			TimeUnit.MILLISECONDS.sleep(10);
+		} catch (InterruptedException e) {
+	    	SimLogger.printLine("impossible is occured! Poisson random number cannot be created!");
+			e.printStackTrace();
+	    	System.exit(0);
+		}
     }
 
     /**
@@ -51,13 +45,6 @@ public class PoissonDistr {
      * @return the next random number in the sequence
      */
         public double sample() {
-            double L = Math.exp(-mean);
+        	return poisson.nextDouble();
-            int k = 0;
-            double p = 1.0;
-            do {
-                p = p * numGen.nextDouble();
-                k++;
-            } while (p > L);
-            return k - 1;
     }
 }

src/edu/boun/edgecloudsim/utils/SimLogger.java

@@ -21,20 +21,15 @@ import java.io.IOException;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.Map;
+import java.util.stream.DoubleStream;
+import java.util.stream.IntStream;
 
 import edu.boun.edgecloudsim.core.SimManager;
 import edu.boun.edgecloudsim.core.SimSettings;
 
 public class SimLogger {
-	public static enum TASK_STATUS {CREATED,
+	public static enum TASK_STATUS {
-									UPLOADING,
+		CREATED, UPLOADING, PROCESSING, DOWNLOADING, COMLETED, REJECTED_DUE_TO_VM_CAPACITY, REJECTED_DUE_TO_BANDWIDTH, UNFINISHED_DUE_TO_BANDWIDTH, UNFINISHED_DUE_TO_MOBILITY
-									PROCESSING,
-									DOWNLOADING,
-									COMLETED,
-									REJECTED_DUE_TO_VM_CAPACITY,
-									REJECTED_DUE_TO_BANDWIDTH,
-									UNFINISHED_DUE_TO_BANDWIDTH,
-									UNFINISHED_DUE_TO_MOBILITY
 	}
 
 	private static boolean fileLogEnabled;
@@ -44,18 +39,18 @@ public class SimLogger {
 	private Map<Integer, LogItem> taskMap;
 	private LinkedList<VmLoadLogItem> vmLoadList;
 
-	private static SimLogger singleton = new SimLogger( );
+	private static SimLogger singleton = new SimLogger();
 
-	/* A private Constructor prevents any other 
+	/*
-	 * class from instantiating.
+	 * A private Constructor prevents any other class from instantiating.
 	 */
-	private SimLogger(){
+	private SimLogger() {
 		fileLogEnabled = false;
 		printLogEnabled = false;
 	}
 
 	/* Static 'instance' method */
-	public static SimLogger getInstance( ) {
+	public static SimLogger getInstance() {
 		return singleton;
 	}
 
@@ -75,30 +70,31 @@ public class SimLogger {
 		printLogEnabled = false;
 	}
 
-	private void appendToFile(BufferedWriter bw, String line) throws IOException{
+	private void appendToFile(BufferedWriter bw, String line) throws IOException {
 		bw.write(line);
 		bw.newLine();
 	}
 
-	public static void printLine(String msg){
+	public static void printLine(String msg) {
-		if(printLogEnabled)
+		if (printLogEnabled)
 			System.out.println(msg);
 	}
 
-	public static void print(String msg){
+	public static void print(String msg) {
-		if(printLogEnabled)
+		if (printLogEnabled)
 			System.out.print(msg);
 	}
 
-	public void simStarted(String outFolder,String fileName) {
+	public void simStarted(String outFolder, String fileName) {
 		filePrefix = fileName;
 		outputFolder = outFolder;
 		taskMap = new HashMap<Integer, LogItem>();
 		vmLoadList = new LinkedList<VmLoadLogItem>();
 	}
 
-	public void addLog(double taskStartTime, int taskId, int taskType, int taskLenght, int taskInputType, int taskOutputSize) {
+	public void addLog(double taskStartTime, int taskId, int taskType, int taskLenght, int taskInputType,
-		//printLine(taskId+"->"+taskStartTime);
+			int taskOutputSize) {
+		// printLine(taskId+"->"+taskStartTime);
 		taskMap.put(taskId, new LogItem(taskStartTime, taskType, taskLenght, taskInputType, taskOutputSize));
 	}
 
@@ -107,7 +103,7 @@ public class SimLogger {
 	}
 
 	public void uploaded(int taskId, int datacenterId, int hostId, int vmId, int vmType) {
-		taskMap.get(taskId).taskUploaded(datacenterId, hostId, vmId,vmType);
+		taskMap.get(taskId).taskUploaded(datacenterId, hostId, vmId, vmType);
 	}
 
 	public void downloadStarted(int taskId, double taskDownloadTime) {
@@ -122,8 +118,8 @@ public class SimLogger {
 		taskMap.get(taskId).taskRejectedDueToVMCapacity(taskRejectTime);
 	}
 
-	public void rejectedDueToBandwidth(int taskId, double taskRejectTime) {
+	public void rejectedDueToBandwidth(int taskId, double taskRejectTime, int vmType) {
-		taskMap.get(taskId).taskRejectedDueToBandwidth(taskRejectTime);
+		taskMap.get(taskId).taskRejectedDueToBandwidth(taskRejectTime, vmType);
 	}
 
 	public void failedDueToBandwidth(int taskId, double taskRejectTime) {
@@ -139,216 +135,402 @@ public class SimLogger {
 	}
 
 	public void simStopped() throws IOException {
-		File file1=null,file2=null,file3=null,file4=null,file5=null;
+		int numOfAppTypes = SimSettings.getInstance().getTaskLookUpTable().length;
-		FileWriter fileWriter1=null,fileWriter2=null,fileWriter3=null,fileWriter4=null,fileWriter5=null;
-		BufferedWriter bufferedWriter1=null,bufferedWriter2=null,bufferedWriter3=null,bufferedWriter4=null,bufferedWriter5=null;
 
-		int uncompletedTaskOnCloudlet = 0;
+		File successFile = null, failFile = null, vmLoadFile = null, locationFile = null;
-		int completedTaskOnCloudlet = 0;
+		FileWriter successFW = null, failFW = null, vmLoadFW = null, locationFW = null;
-		int uncompletedTaskOnCloud = 0;
+		BufferedWriter successBW = null, failBW = null, vmLoadBW = null, locationBW = null;
-		int completedTaskOnCloud = 0;
-		int rejectedTaskDoToVmCapacity = 0;
-		int rejectedTaskDoToBandwidth = 0;
-		int failedTaskDuetoBandwidth = 0;
-		int failedTaskDuetoMobility = 0;
-		int totalCompletedTask = 0;
-		int totalFailedTask = 0;
-		double totalCost = 0;
-		double totalLanDelay = 0;
-		double totalWanDelay = 0;
-		double totalServiceTime = 0;
-		double totalNetworkDelay = 0;
-		double totalProcessingTime = 0;
-		double totalVmLoad = 0;
 
-		//open all files and prepare them for write
+		// Save generic results to file for each app type. last index is average
-		if(fileLogEnabled){
+		// of all app types
-			if(SimSettings.getInstance().getDeepFileLoggingEnabled()){
+		File[] genericFiles = new File[numOfAppTypes + 1];
-				file1 = new File(outputFolder, filePrefix+"_SUCCESS.log");
+		FileWriter[] genericFWs = new FileWriter[numOfAppTypes + 1];
-				fileWriter1 = new FileWriter(file1, true);
+		BufferedWriter[] genericBWs = new BufferedWriter[numOfAppTypes + 1];
-				bufferedWriter1 = new BufferedWriter(fileWriter1);
 
-				file2 = new File(outputFolder, filePrefix+"_FAIL.log");
+		// extract following values for each app type. last index is average of
-				fileWriter2 = new FileWriter(file2, true);
+		// all app types
-				bufferedWriter2 = new BufferedWriter(fileWriter2);
+		int[] uncompletedTask = new int[numOfAppTypes + 1];
+		int[] uncompletedTaskOnCloud = new int[numOfAppTypes + 1];
+		int[] uncompletedTaskOnCloudlet = new int[numOfAppTypes + 1];
+
+		int[] completedTask = new int[numOfAppTypes + 1];
+		int[] completedTaskOnCloud = new int[numOfAppTypes + 1];
+		int[] completedTaskOnCloudlet = new int[numOfAppTypes + 1];
+
+		int[] failedTask = new int[numOfAppTypes + 1];
+		int[] failedTaskOnCloud = new int[numOfAppTypes + 1];
+		int[] failedTaskOnCloudlet = new int[numOfAppTypes + 1];
+
+		double[] networkDelay = new double[numOfAppTypes + 1];
+		double[] wanDelay = new double[numOfAppTypes + 1];
+		double[] lanDelay = new double[numOfAppTypes + 1];
+
+		double[] serviceTime = new double[numOfAppTypes + 1];
+		double[] serviceTimeOnCloud = new double[numOfAppTypes + 1];
+		double[] serviceTimeOnCloudlet = new double[numOfAppTypes + 1];
+
+		double[] processingTime = new double[numOfAppTypes + 1];
+		double[] processingTimeOnCloud = new double[numOfAppTypes + 1];
+		double[] processingTimeOnCloudlet = new double[numOfAppTypes + 1];
+
+		double[] cost = new double[numOfAppTypes + 1];
+		int[] failedTaskDuetoBw = new int[numOfAppTypes + 1];
+		int[] failedTaskDuetoLanBw = new int[numOfAppTypes + 1];
+		int[] failedTaskDuetoWanBw = new int[numOfAppTypes + 1];
+		int[] failedTaskDuetoMobility = new int[numOfAppTypes + 1];
+		int[] rejectedTaskDoToVmCapacity = new int[numOfAppTypes + 1];
+
+		// open all files and prepare them for write
+		if (fileLogEnabled) {
+			if (SimSettings.getInstance().getDeepFileLoggingEnabled()) {
+				successFile = new File(outputFolder, filePrefix + "_SUCCESS.log");
+				successFW = new FileWriter(successFile, true);
+				successBW = new BufferedWriter(successFW);
+
+				failFile = new File(outputFolder, filePrefix + "_FAIL.log");
+				failFW = new FileWriter(failFile, true);
+				failBW = new BufferedWriter(failFW);
 			}
 
-			file3 = new File(outputFolder, filePrefix+"_VM_LOAD.log");
+			vmLoadFile = new File(outputFolder, filePrefix + "_VM_LOAD.log");
-			fileWriter3 = new FileWriter(file3, true);
+			vmLoadFW = new FileWriter(vmLoadFile, true);
-			bufferedWriter3 = new BufferedWriter(fileWriter3);
+			vmLoadBW = new BufferedWriter(vmLoadFW);
 
-			file4 = new File(outputFolder, filePrefix+"_GENERIC.log");
+			locationFile = new File(outputFolder, filePrefix + "_LOCATION.log");
-			fileWriter4 = new FileWriter(file4, true);
+			locationFW = new FileWriter(locationFile, true);
-			bufferedWriter4 = new BufferedWriter(fileWriter4);
+			locationBW = new BufferedWriter(locationFW);
 
-			file5 = new File(outputFolder, filePrefix+"_LOCATION.log");
+			for (int i = 0; i < numOfAppTypes + 1; i++) {
-			fileWriter5 = new FileWriter(file5, true);
+				String fileName = "ALL_APPS_GENERIC.log";
-			bufferedWriter5 = new BufferedWriter(fileWriter5);
 
-			if(SimSettings.getInstance().getDeepFileLoggingEnabled()){
+				if (i < numOfAppTypes) {
-				appendToFile(bufferedWriter1, "# taskId;dataCenterId;hostId;vmId;vmType;taskType;taskLenght;taskInputType;taskOutputSize;taskStartTime;taskEndTime;nwDelay");
+					// if related app is not used in this simulation, just
-				appendToFile(bufferedWriter2, "# taskId;dataCenterId;hostId;vmId;vmType;taskType;taskLenght;taskInputType;taskOutputSize;taskStartTime;taskEndTime;failReason");
+					// discard it
+					if (SimSettings.getInstance().getTaskLookUpTable()[i][0] == 0)
+						continue;
+
+					fileName = SimSettings.APP_TYPES.values()[i] + "_GENERIC.log";
+				}
+
+				genericFiles[i] = new File(outputFolder, filePrefix + "_" + fileName);
+				genericFWs[i] = new FileWriter(genericFiles[i], true);
+				genericBWs[i] = new BufferedWriter(genericFWs[i]);
+				appendToFile(genericBWs[i], "#auto generated file!");
 			}
 
-			appendToFile(bufferedWriter3, "# time;load");
+			if (SimSettings.getInstance().getDeepFileLoggingEnabled()) {
-			appendToFile(bufferedWriter4, "# completedTask;uncompletedTask;rejectedTask;failedDueToMobilityTask;avgFailure;avgServiceTime;avgNetworkDelay;avgServerLoad;avgCost");
+				appendToFile(successBW, "#auto generated file!");
-			appendToFile(bufferedWriter5, "# time;#ofClient@PlaceType1;#ofClient@PlaceTypen");
+				appendToFile(failBW, "#auto generated file!");
+			}
+
+			appendToFile(vmLoadBW, "#auto generated file!");
+			appendToFile(locationBW, "#auto generated file!");
 		}
 
-		//extract the result of each task and write it to the file if required
+		// extract the result of each task and write it to the file if required
 		for (Map.Entry<Integer, LogItem> entry : taskMap.entrySet()) {
 			Integer key = entry.getKey();
 			LogItem value = entry.getValue();
 
-			if(value.isInWarmUpPeriod())
+			if (value.isInWarmUpPeriod())
 				continue;
 
-			if(value.getStatus() == SimLogger.TASK_STATUS.COMLETED){
+			if (value.getStatus() == SimLogger.TASK_STATUS.COMLETED) {
-				if(value.getVmType() == SimSettings.VM_TYPES.CLOUD_VM.ordinal()){
+				completedTask[value.getTaskType()]++;
-					completedTaskOnCloud++;
-					totalWanDelay += value.getNetworkDelay();
-				}
-				else{
-					completedTaskOnCloudlet++;
-					totalLanDelay += value.getNetworkDelay();
-				}
-				totalCost += value.getCost();
-				totalServiceTime += value.getServiceTime();
-				totalNetworkDelay += value.getNetworkDelay();
-				totalProcessingTime += (value.getServiceTime() - value.getNetworkDelay());
 
-				if(fileLogEnabled && SimSettings.getInstance().getDeepFileLoggingEnabled())
+				if (value.getVmType() == SimSettings.VM_TYPES.CLOUD_VM.ordinal())
-					appendToFile(bufferedWriter1, value.toString(key));
+					completedTaskOnCloud[value.getTaskType()]++;
-			}
-			else if(value.getStatus() == SimLogger.TASK_STATUS.REJECTED_DUE_TO_VM_CAPACITY){
-				rejectedTaskDoToVmCapacity++;
-				if(fileLogEnabled && SimSettings.getInstance().getDeepFileLoggingEnabled())
-					appendToFile(bufferedWriter2, value.toString(key));
-			}
-			else if(value.getStatus() == SimLogger.TASK_STATUS.REJECTED_DUE_TO_BANDWIDTH){
-				rejectedTaskDoToBandwidth++;
-				if(fileLogEnabled && SimSettings.getInstance().getDeepFileLoggingEnabled())
-					appendToFile(bufferedWriter2, value.toString(key));
-			}
-			else if(value.getStatus() == SimLogger.TASK_STATUS.UNFINISHED_DUE_TO_BANDWIDTH){
-				failedTaskDuetoBandwidth++;
-				if(fileLogEnabled && SimSettings.getInstance().getDeepFileLoggingEnabled())
-					appendToFile(bufferedWriter2, value.toString(key));
-			}
-			else if(value.getStatus() == SimLogger.TASK_STATUS.UNFINISHED_DUE_TO_MOBILITY){
-				failedTaskDuetoMobility++;
-				if(fileLogEnabled && SimSettings.getInstance().getDeepFileLoggingEnabled())
-					appendToFile(bufferedWriter2, value.toString(key));
-			}
-			else {
-				if(value.getVmType() == SimSettings.VM_TYPES.CLOUD_VM.ordinal())
-					uncompletedTaskOnCloud++;
 				else
-					uncompletedTaskOnCloudlet++;
+					completedTaskOnCloudlet[value.getTaskType()]++;
+			} else {
+				failedTask[value.getTaskType()]++;
+
+				if (value.getVmType() == SimSettings.VM_TYPES.CLOUD_VM.ordinal())
+					failedTaskOnCloud[value.getTaskType()]++;
+				else
+					failedTaskOnCloudlet[value.getTaskType()]++;
+			}
+
+			if (value.getStatus() == SimLogger.TASK_STATUS.COMLETED) {
+				cost[value.getTaskType()] += value.getCost();
+				serviceTime[value.getTaskType()] += value.getServiceTime();
+				networkDelay[value.getTaskType()] += value.getNetworkDelay();
+				processingTime[value.getTaskType()] += (value.getServiceTime() - value.getNetworkDelay());
+
+				if (value.getVmType() == SimSettings.VM_TYPES.CLOUD_VM.ordinal()) {
+					wanDelay[value.getTaskType()] += value.getNetworkDelay();
+					serviceTimeOnCloud[value.getTaskType()] += value.getServiceTime();
+					processingTimeOnCloud[value.getTaskType()] += (value.getServiceTime() - value.getNetworkDelay());
+				} else {
+					lanDelay[value.getTaskType()] += value.getNetworkDelay();
+					serviceTimeOnCloudlet[value.getTaskType()] += value.getServiceTime();
+					processingTimeOnCloudlet[value.getTaskType()] += (value.getServiceTime() - value.getNetworkDelay());
+				}
+
+				if (fileLogEnabled && SimSettings.getInstance().getDeepFileLoggingEnabled())
+					appendToFile(successBW, value.toString(key));
+			} else if (value.getStatus() == SimLogger.TASK_STATUS.REJECTED_DUE_TO_VM_CAPACITY) {
+				rejectedTaskDoToVmCapacity[value.getTaskType()]++;
+				if (value.getVmType() == SimSettings.VM_TYPES.CLOUD_VM.ordinal())
+					if (fileLogEnabled && SimSettings.getInstance().getDeepFileLoggingEnabled())
+						appendToFile(failBW, value.toString(key));
+			} else if (value.getStatus() == SimLogger.TASK_STATUS.REJECTED_DUE_TO_BANDWIDTH
+					|| value.getStatus() == SimLogger.TASK_STATUS.UNFINISHED_DUE_TO_BANDWIDTH) {
+				failedTaskDuetoBw[value.getTaskType()]++;
+				if (value.getVmType() == SimSettings.VM_TYPES.CLOUD_VM.ordinal())
+					failedTaskDuetoWanBw[value.getTaskType()]++;
+				else
+					failedTaskDuetoLanBw[value.getTaskType()]++;
+
+				if (fileLogEnabled && SimSettings.getInstance().getDeepFileLoggingEnabled())
+					appendToFile(failBW, value.toString(key));
+			} else if (value.getStatus() == SimLogger.TASK_STATUS.UNFINISHED_DUE_TO_MOBILITY) {
+				failedTaskDuetoMobility[value.getTaskType()]++;
+				if (fileLogEnabled && SimSettings.getInstance().getDeepFileLoggingEnabled())
+					appendToFile(failBW, value.toString(key));
+			} else {
+				uncompletedTask[value.getTaskType()]++;
+				if (value.getVmType() == SimSettings.VM_TYPES.CLOUD_VM.ordinal())
+					uncompletedTaskOnCloud[value.getTaskType()]++;
+				else
+					uncompletedTaskOnCloudlet[value.getTaskType()]++;
 			}
 		}
-		totalFailedTask = rejectedTaskDoToVmCapacity+rejectedTaskDoToBandwidth+failedTaskDuetoBandwidth;
-		totalCompletedTask = completedTaskOnCloudlet+completedTaskOnCloud;
 
-		//calculate server load
+		// calculate total values
-		for(VmLoadLogItem entry : vmLoadList){
+		uncompletedTask[numOfAppTypes] = IntStream.of(uncompletedTask).sum();
+		uncompletedTaskOnCloud[numOfAppTypes] = IntStream.of(uncompletedTaskOnCloud).sum();
+		uncompletedTaskOnCloudlet[numOfAppTypes] = IntStream.of(uncompletedTaskOnCloudlet).sum();
+
+		completedTask[numOfAppTypes] = IntStream.of(completedTask).sum();
+		completedTaskOnCloud[numOfAppTypes] = IntStream.of(completedTaskOnCloud).sum();
+		completedTaskOnCloudlet[numOfAppTypes] = IntStream.of(completedTaskOnCloudlet).sum();
+
+		failedTask[numOfAppTypes] = IntStream.of(failedTask).sum();
+		failedTaskOnCloud[numOfAppTypes] = IntStream.of(failedTaskOnCloud).sum();
+		failedTaskOnCloudlet[numOfAppTypes] = IntStream.of(failedTaskOnCloudlet).sum();
+
+		networkDelay[numOfAppTypes] = DoubleStream.of(networkDelay).sum();
+		lanDelay[numOfAppTypes] = DoubleStream.of(lanDelay).sum();
+		wanDelay[numOfAppTypes] = DoubleStream.of(wanDelay).sum();
+
+		serviceTime[numOfAppTypes] = DoubleStream.of(serviceTime).sum();
+		serviceTimeOnCloud[numOfAppTypes] = DoubleStream.of(serviceTimeOnCloud).sum();
+		serviceTimeOnCloudlet[numOfAppTypes] = DoubleStream.of(serviceTimeOnCloudlet).sum();
+
+		processingTime[numOfAppTypes] = DoubleStream.of(processingTime).sum();
+		processingTimeOnCloud[numOfAppTypes] = DoubleStream.of(processingTimeOnCloud).sum();
+		processingTimeOnCloudlet[numOfAppTypes] = DoubleStream.of(processingTimeOnCloudlet).sum();
+
+		cost[numOfAppTypes] = DoubleStream.of(cost).sum();
+		failedTaskDuetoBw[numOfAppTypes] = IntStream.of(failedTaskDuetoBw).sum();
+		failedTaskDuetoWanBw[numOfAppTypes] = IntStream.of(failedTaskDuetoWanBw).sum();
+		failedTaskDuetoLanBw[numOfAppTypes] = IntStream.of(failedTaskDuetoLanBw).sum();
+		failedTaskDuetoMobility[numOfAppTypes] = IntStream.of(failedTaskDuetoMobility).sum();
+		rejectedTaskDoToVmCapacity[numOfAppTypes] = IntStream.of(rejectedTaskDoToVmCapacity).sum();
+
+		// calculate server load
+		double totalVmLoad = 0;
+		for (VmLoadLogItem entry : vmLoadList) {
 			totalVmLoad += entry.getLoad();
-			if(fileLogEnabled)
+			if (fileLogEnabled)
-				appendToFile(bufferedWriter3, entry.toString());
+				appendToFile(vmLoadBW, entry.toString());
 		}
 
-		if(fileLogEnabled){
+		if (fileLogEnabled) {
-			//write location info to file
+			// write location info to file
-			for(int t=1; t<(SimSettings.getInstance().getSimulationTime()/SimSettings.getInstance().getVmLocationLogInterval()); t++){
+			for (int t = 1; t < (SimSettings.getInstance().getSimulationTime()
+					/ SimSettings.getInstance().getVmLocationLogInterval()); t++) {
 				int[] locationInfo = new int[SimSettings.PLACE_TYPES.values().length];
-				for(int i=0; i<SimManager.getInstance().getNumOfMobileDevice(); i++) {
+				Double time = t * SimSettings.getInstance().getVmLocationLogInterval();
 
-					Location loc = SimManager.getInstance().getMobilityModel().getLocation(i, t*SimSettings.getInstance().getVmLocationLogInterval());
+				if (time < SimSettings.getInstance().getWarmUpPeriod())
+					continue;
+
+				for (int i = 0; i < SimManager.getInstance().getNumOfMobileDevice(); i++) {
+
+					Location loc = SimManager.getInstance().getMobilityModel().getLocation(i, time);
 					SimSettings.PLACE_TYPES placeType = loc.getPlaceType();
 					locationInfo[placeType.ordinal()]++;
 				}
 
-				Double time=t*SimSettings.getInstance().getVmLocationLogInterval();
+				locationBW.write(time.toString());
-				bufferedWriter5.write(time.toString());
+				for (int i = 0; i < locationInfo.length; i++)
-				for(int i=0; i<locationInfo.length; i++)
+					locationBW.write(SimSettings.DELIMITER + locationInfo[i]);
-					bufferedWriter5.write(SimSettings.DELIMITER + locationInfo[i]);
 
-				bufferedWriter5.newLine();
+				locationBW.newLine();
 			}
 
-			//write generic results
+			for (int i = 0; i < numOfAppTypes + 1; i++) {
-			String genericResult = Integer.toString(completedTaskOnCloudlet) + SimSettings.DELIMITER + 
-					Integer.toString(uncompletedTaskOnCloudlet) + SimSettings.DELIMITER +
-					Integer.toString(completedTaskOnCloud) + SimSettings.DELIMITER + 
-					Integer.toString(uncompletedTaskOnCloud) + SimSettings.DELIMITER +
-					Integer.toString(rejectedTaskDoToVmCapacity) + SimSettings.DELIMITER +
-					Integer.toString(rejectedTaskDoToBandwidth) + SimSettings.DELIMITER +
-					Integer.toString(failedTaskDuetoBandwidth) + SimSettings.DELIMITER +
-					Integer.toString(failedTaskDuetoMobility) + SimSettings.DELIMITER +
-					Double.toString(((double)totalFailedTask*(double)100)/(double)(totalCompletedTask+totalFailedTask)) + SimSettings.DELIMITER +
-					Double.toString(totalServiceTime/(double)totalCompletedTask) + SimSettings.DELIMITER +
-					Double.toString(totalNetworkDelay/(double)totalCompletedTask) + SimSettings.DELIMITER +
-					Double.toString(totalLanDelay/(double)totalCompletedTask) + SimSettings.DELIMITER +
-					Double.toString(totalWanDelay/(double)totalCompletedTask) + SimSettings.DELIMITER +
-					Double.toString(totalProcessingTime/(double)totalCompletedTask) + SimSettings.DELIMITER +
-					Double.toString(totalVmLoad/(double)vmLoadList.size()) + SimSettings.DELIMITER +
-					Double.toString(totalCost/(double)totalCompletedTask);
 
-			appendToFile(bufferedWriter4,genericResult);
+				if (i < numOfAppTypes) {
+					// if related app is not used in this simulation, just
+					// discard it
+					if (SimSettings.getInstance().getTaskLookUpTable()[i][0] == 0)
+						continue;
+				}
 
-			//close open files
+				// check if the divisor is zero in order to avoid division by
-			if(SimSettings.getInstance().getDeepFileLoggingEnabled()){
+				// zero problem
-				bufferedWriter1.close();
+				double _serviceTime = (completedTask[i] == 0) ? 0.0 : (serviceTime[i] / (double) completedTask[i]);
-				bufferedWriter2.close();
+				double _networkDelay = (completedTask[i] == 0) ? 0.0 : (networkDelay[i] / (double) completedTask[i]);
+				double _processingTime = (completedTask[i] == 0) ? 0.0 : (processingTime[i] / (double) completedTask[i]);
+				double _vmLoad = (vmLoadList.size() == 0) ? 0.0 : (totalVmLoad / (double) vmLoadList.size());
+				double _cost = (completedTask[i] == 0) ? 0.0 : (cost[i] / (double) completedTask[i]);
+
+				// write generic results
+				String genericResult1 = Integer.toString(completedTask[i]) + SimSettings.DELIMITER
+						+ Integer.toString(failedTask[i]) + SimSettings.DELIMITER 
+						+ Integer.toString(uncompletedTask[i]) + SimSettings.DELIMITER 
+						+ Integer.toString(failedTaskDuetoBw[i]) + SimSettings.DELIMITER
+						+ Double.toString(_serviceTime) + SimSettings.DELIMITER 
+						+ Double.toString(_processingTime) + SimSettings.DELIMITER 
+						+ Double.toString(_networkDelay) + SimSettings.DELIMITER
+						+ Double.toString(_vmLoad) + SimSettings.DELIMITER 
+						+ Double.toString(_cost) + SimSettings.DELIMITER 
+						+ Integer.toString(rejectedTaskDoToVmCapacity[i]) + SimSettings.DELIMITER 
+						+ Integer.toString(failedTaskDuetoMobility[i]);
+
+				// check if the divisor is zero in order to avoid division by
+				// zero problem
+				double _lanDelay = (completedTaskOnCloudlet[i] == 0) ? 0.0
+						: (lanDelay[i] / (double) completedTaskOnCloudlet[i]);
+				double _serviceTimeOnCloudlet = (completedTaskOnCloudlet[i] == 0) ? 0.0
+						: (serviceTimeOnCloudlet[i] / (double) completedTaskOnCloudlet[i]);
+				double _processingTimeOnCloudlet = (completedTaskOnCloudlet[i] == 0) ? 0.0
+						: (processingTimeOnCloudlet[i] / (double) completedTaskOnCloudlet[i]);
+				String genericResult2 = Integer.toString(completedTaskOnCloudlet[i]) + SimSettings.DELIMITER
+						+ Integer.toString(failedTaskOnCloudlet[i]) + SimSettings.DELIMITER
+						+ Integer.toString(uncompletedTaskOnCloudlet[i]) + SimSettings.DELIMITER
+						+ Integer.toString(failedTaskDuetoLanBw[i]) + SimSettings.DELIMITER
+						+ Double.toString(_serviceTimeOnCloudlet) + SimSettings.DELIMITER
+						+ Double.toString(_processingTimeOnCloudlet) + SimSettings.DELIMITER
+						+ Double.toString(_lanDelay);
+
+				// check if the divisor is zero in order to avoid division by
+				// zero problem
+				double _wanDelay = (completedTaskOnCloud[i] == 0) ? 0.0
+						: (wanDelay[i] / (double) completedTaskOnCloud[i]);
+				double _serviceTimeOnCloud = (completedTaskOnCloud[i] == 0) ? 0.0
+						: (serviceTimeOnCloud[i] / (double) completedTaskOnCloud[i]);
+				double _processingTimeOnCloud = (completedTaskOnCloud[i] == 0) ? 0.0
+						: (processingTimeOnCloud[i] / (double) completedTaskOnCloud[i]);
+				String genericResult3 = Integer.toString(completedTaskOnCloud[i]) + SimSettings.DELIMITER
+						+ Integer.toString(failedTaskOnCloud[i]) + SimSettings.DELIMITER
+						+ Integer.toString(uncompletedTaskOnCloud[i]) + SimSettings.DELIMITER
+						+ Integer.toString(failedTaskDuetoWanBw[i]) + SimSettings.DELIMITER
+						+ Double.toString(_serviceTimeOnCloud) + SimSettings.DELIMITER
+						+ Double.toString(_processingTimeOnCloud) + SimSettings.DELIMITER 
+						+ Double.toString(_wanDelay);
+
+				appendToFile(genericBWs[i], genericResult1);
+				appendToFile(genericBWs[i], genericResult2);
+				appendToFile(genericBWs[i], genericResult3);
+			}
+
+			// close open files
+			if (SimSettings.getInstance().getDeepFileLoggingEnabled()) {
+				successBW.close();
+				failBW.close();
+			}
+			vmLoadBW.close();
+			locationBW.close();
+			for (int i = 0; i < numOfAppTypes + 1; i++) {
+				if (i < numOfAppTypes) {
+					// if related app is not used in this simulation, just
+					// discard it
+					if (SimSettings.getInstance().getTaskLookUpTable()[i][0] == 0)
+						continue;
+				}
+				genericBWs[i].close();
 			}
-			bufferedWriter3.close();
-			bufferedWriter4.close();
-			bufferedWriter5.close();
 		}
 
-		//printout important results
+		// printout important results
-		printLine("# of uncompleted tasks on Cloudlet/Cloud: " + uncompletedTaskOnCloudlet + "/" + uncompletedTaskOnCloud);
+		printLine("# of tasks (Cloudlet/Cloud): "
-		printLine("# of completed task on Cloudlet/Cloud: " + (completedTaskOnCloudlet+uncompletedTaskOnCloudlet) + "/" + (completedTaskOnCloud+uncompletedTaskOnCloud));
+				+ (failedTask[numOfAppTypes] + completedTask[numOfAppTypes]) + "("
-		printLine("# of rejected tasks (due to vm capacity): " + rejectedTaskDoToVmCapacity);
+				+ (failedTaskOnCloudlet[numOfAppTypes] + completedTaskOnCloudlet[numOfAppTypes]) + "/" 
-		printLine("# of rejected tasks (due to bandwidth): " + rejectedTaskDoToBandwidth);
+				+ (failedTaskOnCloud[numOfAppTypes]+ completedTaskOnCloud[numOfAppTypes]) + ")");
-		printLine("# of failed tasks (due to bandwidth): " + failedTaskDuetoBandwidth);
-		printLine("# of failed tasks (due to mobility): " + failedTaskDuetoMobility);
-		printLine("percentage of failed task: " + String.format("%.6f", ((double)totalFailedTask*(double)100)/(double)(totalCompletedTask+totalFailedTask)) + "%");
-		printLine("average service time: " + String.format("%.6f", totalServiceTime/(double)totalCompletedTask) + " seconds. ("
-				+ "processing time: " + String.format("%.6f", totalProcessingTime/(double)totalCompletedTask) + ")");
-		printLine("average netwrok delay: " + String.format("%.6f", totalNetworkDelay/(double)totalCompletedTask) + " seconds. ("
-				+ "LAN delay: " + String.format("%.6f", totalLanDelay/(double)totalCompletedTask) + ", "
-				+ "WAN delay: " + String.format("%.6f", totalWanDelay/(double)totalCompletedTask) + ")");
-		printLine("average server utilization: " + String.format("%.6f", totalVmLoad/(double)vmLoadList.size()) + "%");
-		printLine("average cost: " + totalCost/totalCompletedTask + "$");
 		
-		//clear related collections (map list etc.)
+		printLine("# of failed tasks (Cloudlet/Cloud): "
+				+ failedTask[numOfAppTypes] + "("
+				+ failedTaskOnCloudlet[numOfAppTypes]
+				+ "/" + failedTaskOnCloud[numOfAppTypes] + ")");
+		
+		printLine("# of completed tasks (Cloudlet/Cloud): "
+				+ completedTask[numOfAppTypes] + "("
+				+ completedTaskOnCloudlet[numOfAppTypes]
+				+ "/" + completedTaskOnCloud[numOfAppTypes] + ")");
+		
+		printLine("# of uncompleted tasks (Cloudlet/Cloud): "
+				+ uncompletedTask[numOfAppTypes] + "("
+				+ uncompletedTaskOnCloudlet[numOfAppTypes]
+				+ "/" + uncompletedTaskOnCloud[numOfAppTypes] + ")");
+		
+		printLine("# of failed tasks due to vm capacity/LAN bw/WAN bw/mobility: "
+				+ rejectedTaskDoToVmCapacity[numOfAppTypes]
+				+ "/" + +failedTaskDuetoLanBw[numOfAppTypes] 
+				+ "/" + +failedTaskDuetoWanBw[numOfAppTypes] 
+				+ "/" + failedTaskDuetoMobility[numOfAppTypes]);
+		
+		printLine("percentage of failed tasks: "
+				+ String.format("%.6f", ((double) failedTask[numOfAppTypes] * (double) 100)
+						/ (double) (completedTask[numOfAppTypes] + failedTask[numOfAppTypes]))
+				+ "%");
+
+		printLine("average service time: "
+				+ String.format("%.6f", serviceTime[numOfAppTypes] / (double) completedTask[numOfAppTypes])
+				+ " seconds. (" + "on Cloudlet: "
+				+ String.format("%.6f", serviceTimeOnCloudlet[numOfAppTypes] / (double) completedTaskOnCloudlet[numOfAppTypes])
+				+ ", " + "on Cloud: "
+				+ String.format("%.6f", serviceTimeOnCloud[numOfAppTypes] / (double) completedTaskOnCloud[numOfAppTypes])
+				+ ")");
+
+		printLine("average processing time: "
+				+ String.format("%.6f", processingTime[numOfAppTypes] / (double) completedTask[numOfAppTypes])
+				+ " seconds. (" + "on Cloudlet: "
+				+ String.format("%.6f", processingTimeOnCloudlet[numOfAppTypes] / (double) completedTaskOnCloudlet[numOfAppTypes])
+				+ ", " + "on Cloud: " 
+				+ String.format("%.6f", processingTimeOnCloud[numOfAppTypes] / (double) completedTaskOnCloud[numOfAppTypes])
+				+ ")");
+
+		printLine("average netwrok delay: "
+				+ String.format("%.6f", networkDelay[numOfAppTypes] / (double) completedTask[numOfAppTypes])
+				+ " seconds. (" + "LAN delay: "
+				+ String.format("%.6f", lanDelay[numOfAppTypes] / (double) completedTaskOnCloudlet[numOfAppTypes])
+				+ ", " + "WAN delay: "
+				+ String.format("%.6f", wanDelay[numOfAppTypes] / (double) completedTaskOnCloud[numOfAppTypes]) + ")");
+
+		printLine("average server utilization: " 
+				+ String.format("%.6f", totalVmLoad / (double) vmLoadList.size()) + "%");
+		
+		printLine("average cost: " + cost[numOfAppTypes] / completedTask[numOfAppTypes] + "$");
+
+		// clear related collections (map list etc.)
 		taskMap.clear();
 		vmLoadList.clear();
 	}
 }
 
-class VmLoadLogItem
+class VmLoadLogItem {
-{
 	private double time;
 	private double vmLoad;
 
-	VmLoadLogItem(double _time, double _vmLoad)
+	VmLoadLogItem(double _time, double _vmLoad) {
-	{
 		time = _time;
 		vmLoad = _vmLoad;
 	}
-	public double getLoad()
+
-	{
+	public double getLoad() {
 		return vmLoad;
 	}
-	public String toString()
+
-	{
+	public String toString() {
 		return time + SimSettings.DELIMITER + vmLoad;
 	}
 }
-class LogItem
+
-{
+class LogItem {
 	private SimLogger.TASK_STATUS status;
 	private int datacenterId;
 	private int hostId;
@@ -364,104 +546,118 @@ class LogItem
 	private double bwCost;
 	private double cpuCost;
 	private boolean isInWarmUpPeriod;
-	LogItem (double _taskStartTime, int _taskType, int _taskLenght, int _taskInputType, int _taskOutputSize)
+
-	{
+	LogItem(double _taskStartTime, int _taskType, int _taskLenght, int _taskInputType, int _taskOutputSize) {
 		taskStartTime = _taskStartTime;
-		taskType=_taskType;
+		taskType = _taskType;
-		taskLenght=_taskLenght;
+		taskLenght = _taskLenght;
-		taskInputType=_taskInputType;
+		taskInputType = _taskInputType;
-		taskOutputSize=_taskOutputSize;
+		taskOutputSize = _taskOutputSize;
 		status = SimLogger.TASK_STATUS.CREATED;
 		taskEndTime = 0;
 
-		if(_taskStartTime < SimSettings.getInstance().getWarmUpPeriod())
+		if (_taskStartTime < SimSettings.getInstance().getWarmUpPeriod())
 			isInWarmUpPeriod = true;
 		else
 			isInWarmUpPeriod = false;
 	}
+	
 	public void taskUploadStarted(double taskUploadTime) {
 		networkDelay += taskUploadTime;
 		status = SimLogger.TASK_STATUS.UPLOADING;
 	}
+
 	public void taskUploaded(int _datacenterId, int _hostId, int _vmId, int _vmType) {
 		status = SimLogger.TASK_STATUS.PROCESSING;
 		datacenterId = _datacenterId;
 		hostId = _hostId;
 		vmId = _vmId;
-		vmType=_vmType;
+		vmType = _vmType;
 	}
+
 	public void taskDownloadStarted(double taskDownloadTime) {
 		networkDelay += taskDownloadTime;
 		status = SimLogger.TASK_STATUS.DOWNLOADING;
 	}
+
 	public void taskDownloaded(double _taskEndTime) {
 		taskEndTime = _taskEndTime;
 		status = SimLogger.TASK_STATUS.COMLETED;
 	}
+
 	public void taskRejectedDueToVMCapacity(double _taskRejectTime) {
 		taskEndTime = _taskRejectTime;
 		status = SimLogger.TASK_STATUS.REJECTED_DUE_TO_VM_CAPACITY;
 	}
-	public void taskRejectedDueToBandwidth(double _taskRejectTime) {
+
+	public void taskRejectedDueToBandwidth(double _taskRejectTime, int _vmType) {
+		vmType = _vmType;
 		taskEndTime = _taskRejectTime;
 		status = SimLogger.TASK_STATUS.REJECTED_DUE_TO_BANDWIDTH;
 	}
+
 	public void taskFailedDueToBandwidth(double _time) {
 		taskEndTime = _time;
 		status = SimLogger.TASK_STATUS.UNFINISHED_DUE_TO_BANDWIDTH;
 	}
+
 	public void taskFailedDueToMobility(double _time) {
 		taskEndTime = _time;
 		status = SimLogger.TASK_STATUS.UNFINISHED_DUE_TO_MOBILITY;
 	}
+
 	public void setCost(double _bwCost, double _cpuCos) {
 		bwCost = _bwCost;
 		cpuCost = _cpuCos;
 	}
-	public boolean isInWarmUpPeriod(){
+
+	public boolean isInWarmUpPeriod() {
 		return isInWarmUpPeriod;
 	}
+
 	public double getCost() {
 		return bwCost + cpuCost;
 	}
+
 	public double getNetworkDelay() {
 		return networkDelay;
 	}
+
 	public double getServiceTime() {
 		return taskEndTime - taskStartTime;
 	}
-	public SimLogger.TASK_STATUS getStatus(){
+
+	public SimLogger.TASK_STATUS getStatus() {
 		return status;
 	}
-	public int getVmType(){
+
+	public int getVmType() {
 		return vmType;
 	}
-	public String toString (int taskId)
-	{
-		String result = taskId + SimSettings.DELIMITER +
-				datacenterId + SimSettings.DELIMITER +
-				hostId + SimSettings.DELIMITER +
-				vmId + SimSettings.DELIMITER +
-				vmType + SimSettings.DELIMITER +
-				taskType + SimSettings.DELIMITER +
-				taskLenght + SimSettings.DELIMITER +
-				taskInputType + SimSettings.DELIMITER +
-				taskOutputSize + SimSettings.DELIMITER +
-				taskStartTime +  SimSettings.DELIMITER +
-				taskEndTime +  SimSettings.DELIMITER;
 
-		if(status == SimLogger.TASK_STATUS.COMLETED)
+	public int getTaskType() {
+		return taskType;
+	}
+
+	public String toString(int taskId) {
+		String result = taskId + SimSettings.DELIMITER + datacenterId + SimSettings.DELIMITER + hostId
+				+ SimSettings.DELIMITER + vmId + SimSettings.DELIMITER + vmType + SimSettings.DELIMITER + taskType
+				+ SimSettings.DELIMITER + taskLenght + SimSettings.DELIMITER + taskInputType + SimSettings.DELIMITER
+				+ taskOutputSize + SimSettings.DELIMITER + taskStartTime + SimSettings.DELIMITER + taskEndTime
+				+ SimSettings.DELIMITER;
+
+		if (status == SimLogger.TASK_STATUS.COMLETED)
 			result += networkDelay;
-		else if(status == SimLogger.TASK_STATUS.REJECTED_DUE_TO_VM_CAPACITY)
+		else if (status == SimLogger.TASK_STATUS.REJECTED_DUE_TO_VM_CAPACITY)
-			result +="1"; //failure reason 1
+			result += "1"; // failure reason 1
-		else if(status == SimLogger.TASK_STATUS.REJECTED_DUE_TO_BANDWIDTH)
+		else if (status == SimLogger.TASK_STATUS.REJECTED_DUE_TO_BANDWIDTH)
-			result +="2"; //failure reason 2
+			result += "2"; // failure reason 2
-		else if(status == SimLogger.TASK_STATUS.UNFINISHED_DUE_TO_BANDWIDTH)
+		else if (status == SimLogger.TASK_STATUS.UNFINISHED_DUE_TO_BANDWIDTH)
-			result +="3"; //failure reason 3
+			result += "3"; // failure reason 3
-		else if(status == SimLogger.TASK_STATUS.UNFINISHED_DUE_TO_MOBILITY)
+		else if (status == SimLogger.TASK_STATUS.UNFINISHED_DUE_TO_MOBILITY)
-			result +="4"; //failure reason 4
+			result += "4"; // failure reason 4
 		else
-			result +="0"; //default failure reason
+			result += "0"; // default failure reason
 		return result;
 	}
 }