uml diagram

class_diagram_custom.plantuml

@@ -1,22 +1,30 @@
 @startuml
 
 class "car" {
+  carModel : carTemplate
   battery : int
-  fullBattery : int
   chargeLock : int
-  chargeSpeed : int
+  drivesToWorkHour : int
-  model : String
+  drivesFromWorkHour : int
-  id : int
+  homeCarGrid : carGrid
-  charge()
+  workCarGrid : carGrid
-  setChargeLock(double chargeLock)
+  driveToWorkPower : int
-  double getBatteryRelativ()
+  hoursToWork : int
+  stuck : boolean
+  carName : String
+  speed : int
+  workDistance : int
+  charge(int) : int
+  tickDrive(int)
 }
 
 class "carGrid" {
+  id : int
   dockedCars : ArrayList<car>
   models : carTemplate[]
-  chargeCars()
+  capacityDockedCars() : int
-  fillWithCars()
+  chargeCars(int) : int
+  relativeChargeState() : double
 }
 
 class "carTemplate" {
@@ -27,12 +35,11 @@ class "carTemplate" {
 }
 
 class "powerGrid" {
-  energieAvailable : int
+  {static} logLevel : int
-  savedEnergie : int
+  {static} main(String[])
 }
 
-"carGrid" --> "*" "car" : dockedCars
+"car" "*" <-> "carGrid" : homeCarGrid/workCarGrid/dockedCars
-"powerGrid" --> "carGrid"
+"car" --> "carTemplate" : carModel
-"carGrid" --> "carTemplate"
 
 @enduml

src/main/java/de/mrgeorgen/v2g/car.java

@@ -1,35 +1,87 @@
 package de.mrgeorgen.v2g;
+import java.util.Random;
 
 public class car {
-	private int battery;
+	private static int idCounter;
-    	private final int fullBattery;
+	public final carTemplate carModel;
+	public int battery;
 	private int chargeLock;
-	private final int chargeSpeed;
+	private final int drivesToWorkHour;
-	private final String model;
+	private final int drivesFromWorkHour;
-	private final int id;
+	private final carGrid homeCarGrid;
+	public carGrid workCarGrid;
+	private final int driveToWorkPower;
+	private final int hoursToWork;
+	private boolean stuck;
+	private final String carName;
+	private final int speed;
+	private final int workDistance;
 
-	public car(String model, int fullBattery, int chargeSpeed, int id) { // id can be the same for different models
+	public car(carGrid homeCarGrid, carTemplate carModel) {
-		this.fullBattery = 1000 * fullBattery; // convert kWh to Wh
+		this.homeCarGrid = homeCarGrid;
-		this.chargeSpeed = chargeSpeed * 1000; // convert kW to W
+		this.carModel = carModel;
-		this.setChargeLock(0.6);
+		chargeLock = (int)(carModel.fullBattery * 0.6);
-		this.id = id;
+		carName = carModel.model + " id. " + idCounter++;
-		this.model = model;
+		battery = carModel.fullBattery / 2;
-		this.battery = this.fullBattery / 2;
+		Random random = new Random();
+		drivesToWorkHour = 5 + random.nextInt(4);
+		drivesFromWorkHour = 14 + random.nextInt(8);
+		speed = 30 + random.nextInt(100);
+		workDistance = random.nextInt(100);
+		hoursToWork = workDistance / speed;
+		driveToWorkPower = carModel.fullBattery * workDistance / carModel.range / (hoursToWork != 0 ? hoursToWork : 1);
 	}
-	public void charge() {
+	public int charge(int maxPower) {
-		int chargeAmmount = Math.abs(powerGrid.energieAvailable) < this.chargeSpeed ? powerGrid.energieAvailable : powerGrid.energieAvailable > 0 ? this.chargeSpeed : -1 * this.chargeSpeed;
+		int chargePower = Math.abs(maxPower) < carModel.chargeSpeed ? maxPower : carModel.chargeSpeed * Integer.signum(maxPower);
-		if(this.battery + chargeAmmount <= this.chargeLock && chargeAmmount < 0) chargeAmmount = (this.battery - this.chargeLock) * -1; // do not charge if the car gets under the charge lock
+		if(battery + chargePower < chargeLock && chargePower < 0) {
-		if(this.battery + chargeAmmount > this.fullBattery) chargeAmmount = this.fullBattery - this.battery; // prevent the battery from overcharging
+			// do not charge if the car gets under the charge lock
-		if(this.battery + chargeAmmount < 0) chargeAmmount = this.battery * -1; // prevent the battery from dischargingunder 0%
+			if(battery >= chargeLock) chargePower = -(battery - chargeLock);
-		if(chargeAmmount != 0) System.out.println(this.model + " nr. " + this.id + " is " + (chargeAmmount < 0 ? "dis" : "") + "charging with " + (double)Math.abs(chargeAmmount) / 1000 +  " kW. battery: " + (double)this.battery / 1000 + "/" + (double)this.fullBattery / 1000 + " kWh (" + Math.round(getBatteryRelativ() * 100) + "%)");
+			else chargePower = 0;
-		this.battery += chargeAmmount;
+		}
-		powerGrid.energieAvailable -= chargeAmmount;
+		if(battery + chargePower > carModel.fullBattery) chargePower = carModel.fullBattery - battery; // prevent the battery from overcharging
-		if(chargeAmmount < 0) powerGrid.savedEnergie += Math.abs(chargeAmmount);
+		if(battery + chargePower < 0) chargePower = -battery; // prevent the battery from discharging under 0%
+		if(powerGrid.logLevel >= 3 && chargePower != 0) System.out.println(carName + " is " + (chargePower < 0 ? "dis" : "") + "charging with " + (double)Math.abs(chargePower) / 1000 +  " kW. battery: " + (double)battery / 1000 + "/" + (double)carModel.fullBattery / 1000 + " kWh (" + Math.round(getBatteryRelativ() * 100) + "%)");
+		battery += chargePower;
+		return chargePower;
     	}
-	private void setChargeLock(double chargeLock) {
-		this.chargeLock = (int)(this.fullBattery * chargeLock);
-	}
 	public double getBatteryRelativ() {
-		return (double)this.battery / this.fullBattery;
+		return (double)battery / carModel.fullBattery;
+	}
+	public void tickDrive(int hourOfDay) {
+		if(stuck) return;
+		int driveStartHour;
+		carGrid carStartFrom;
+		carGrid carDrivesTo;
+		String destination;
+		if(duringDrive(hourOfDay, drivesToWorkHour)) {
+			driveStartHour = drivesToWorkHour;
+			carStartFrom = homeCarGrid;
+			carDrivesTo = workCarGrid;
+			destination = "work";
+		}
+		else if(duringDrive(hourOfDay, drivesFromWorkHour)) {
+			driveStartHour = drivesFromWorkHour;
+			carStartFrom = workCarGrid;
+			carDrivesTo = homeCarGrid;
+			destination = "home";
+		}
+		else return;
+		if(hourOfDay == driveStartHour) {
+			carStartFrom.dockedCars.remove(this);
+			if(hoursToWork != 0) return;
+		}
+		battery -= driveToWorkPower;
+		if(battery < 0) {
+			stuck = true;
+			if(powerGrid.logLevel >= 1) System.out.println(carName + " is stuck because of an empty battery during drive to " + destination);
+			return;
+		}
+		if(hourOfDay == driveStartHour + hoursToWork) {
+			carDrivesTo.dockedCars.add(this);
+			if(powerGrid.logLevel >= 3) System.out.println(carName + " drove " + workDistance + " km to " + destination + " with " + speed + " km/h");
+		}
+	}
+	private boolean duringDrive(int hourOfDay, int startHour) {
+		return hourOfDay >= startHour && hourOfDay <= startHour + hoursToWork;
 	}
 }

src/main/java/de/mrgeorgen/v2g/carGrid.java

@@ -1,10 +1,12 @@
 package de.mrgeorgen.v2g;
+import java.lang.Double;
 import java.util.ArrayList;
-import java.util.Random;
 import java.util.Collections;
 import java.util.Comparator;
-import java.lang.Double;
+import java.util.Random;
+
 public class carGrid {
+	private final int id;
 	public ArrayList<car> dockedCars = new ArrayList<car>();
 	private final carTemplate[] models = {new carTemplate("Tesla Model 3", 50, 160, 335),
 	new carTemplate("Renault Zoe ZE50", 52, 46, 315),
@@ -14,16 +16,17 @@ public class carGrid {
 	new carTemplate("Tesla Model S Long Range", 90, 250, 555),
 	new carTemplate("Smart EQ forfour", 17, 5, 95),
 	new carTemplate("Honda e", 29, 56, 170)};
-	public void fillWithCars() {
+	public carGrid(int id) {
+		this.id = id;
 		Random random = new Random();
 		for(carTemplate carModel : models) {
 			final int numberOfCars = random.nextInt(10);
 			for(int i = 0; i < numberOfCars; ++i) {
-				dockedCars.add(new car(carModel.model, carModel.fullBattery, carModel.chargeSpeed, i));
+				dockedCars.add(new car(this, carModel));
 			}
 		}
 	}
-	public void chargeCars() {
+	public int chargeCars(int maxPower) {
 		Collections.sort(dockedCars, new Comparator<car>() {
 			public int compare(car car1, car car2) {
 				Double car1RelativBattery = car1.getBatteryRelativ();
@@ -31,11 +34,26 @@ public class carGrid {
 				return car1RelativBattery.compareTo(car2RelativBattery);
 			}
 		});
-		if(powerGrid.energieAvailable < 0) Collections.reverse(dockedCars);
+		if(maxPower < 0) Collections.reverse(dockedCars);
-		dockedCars.forEach((car car) -> {
+		int charged = 0;
-			car.charge();
+		for(car car : dockedCars) {
-		});
+			charged += car.charge(maxPower - charged);
-		if(powerGrid.energieAvailable > 0) System.out.println(powerGrid.energieAvailable + " W could not be used by the cars");
+		}
-		else if(powerGrid.energieAvailable < 0) System.out.println(Math.abs(powerGrid.energieAvailable) + " W could not be taken from the cars");
+		if(powerGrid.logLevel >= 2 && charged != 0) System.out.println("carGrid " + id + " " + (charged < 0 ? "dis" : "") + "charged " + dockedCars.size() + " cars with " + (double)Math.abs(charged) / 1000 + " kW");
+		return charged;
+	}
+	public int capacityDockedCars() {
+		int maxBattery = 0;
+		for(car car : dockedCars) {
+			maxBattery += car.carModel.fullBattery;
+		}
+		return maxBattery;
+	}
+	public double relativeChargeState() {
+		int battery = 0;
+		for(car car : dockedCars) {
+			battery += car.battery;
+		}
+		return (double)battery / capacityDockedCars();
 	}
 }

src/main/java/de/mrgeorgen/v2g/carTemplate.java

@@ -7,9 +7,9 @@ public class carTemplate {
 	public final int range;
 
 	public carTemplate(String model, int fullBattery, int chargeSpeed, int range) {
+		this.fullBattery = 1000 * fullBattery; // convert kWh to Wh
+		this.chargeSpeed = chargeSpeed * 1000; // convert kW to W
 		this.model = model;
-		this.chargeSpeed = chargeSpeed;
-		this.fullBattery = fullBattery;
 		this.range = range;
 	}
 }

src/main/java/de/mrgeorgen/v2g/powerGrid.java

@@ -1,28 +1,62 @@
 package de.mrgeorgen.v2g;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
 import java.util.Random;
 public class powerGrid {
-	public static int energieAvailable;
+	public static int logLevel;
-	public static int savedEnergie;
 	public static void main(String args[]) {
-		if(args.length != 1) {
+		if(args.length != 2) {
-			System.out.println("Invalid Syntax. Use the number of days the simulation shell run as the first argument");
+			System.out.println("Invalid Syntax. Use the number of days the simulation shell run as the first argument and the logLevel as the second. level 1 for only errors. level 2 for information about the carGrid and level 3 for car informations");
 			return;
 		}
-		final carGrid carGrid = new carGrid();
+		logLevel = Integer.parseInt(args[1]);
-		carGrid.fillWithCars();
-		final int hourSimulationRuns = Integer.parseInt(args[0]) * 24;
 		Random random = new Random();
+		ArrayList<car> allCars = new ArrayList<car>();
+		ArrayList<carGrid> carGrids = new ArrayList<carGrid>();
+		final int numberOfCarGrids = 2 + random.nextInt(10);
+		for(int i = 0; i < numberOfCarGrids; ++i) {
+			final carGrid carGrid = new carGrid(i);
+			carGrids.add(carGrid);
+			allCars.addAll(carGrid.dockedCars);
+		}
+		// done after initlising the car because when the car constructor is called not all carGrids are created yet
+		for(car car : allCars) {
+			car.workCarGrid = carGrids.get(random.nextInt(carGrids.size()));
+		}
+		final int hourSimulationRuns = Integer.parseInt(args[0]) * 24;
+		int savedEnergie = 0;
 		for(int houresPassed = 0; houresPassed < hourSimulationRuns; ++houresPassed) {
 			final int hourOfDay = houresPassed % 24;
-			System.out.println("Day " + houresPassed / 24 + " Hour " + hourOfDay);
+			if(logLevel >= 2) System.out.println("Day " + houresPassed / 24 + " Hour " + hourOfDay);
-			int averageEnergie;
+			int averagePower;
-			if(hourOfDay < 6 || hourOfDay > 22) averageEnergie = carGrid.dockedCars.size() * 3000; // energie available at night
+			if(hourOfDay < 6 || hourOfDay > 22) averagePower = allCars.size() * 4000; // energie available at night
-			else if(hourOfDay < 7) averageEnergie = carGrid.dockedCars.size() * -1000; // energie for light in the morning
+			else if(hourOfDay < 7) averagePower = allCars.size() * -1000; // energie for light in the morning
-			else if(hourOfDay < 19) averageEnergie = carGrid.dockedCars.size() * -500; // at the day energie is still needed but not as much because the lights are not on
+			else if(hourOfDay < 19) averagePower = allCars.size() * -500; // at the day energie is still needed but not as much because the lights are not on
-			else /* hourOfDay > 19 && hourOfDay < 23 */ averageEnergie = carGrid.dockedCars.size() * -1000; // the lights are on again
+			else /* hourOfDay > 19 && hourOfDay < 23 */ averagePower = allCars.size() * -1000; // the lights are on again
-			energieAvailable = (int)(averageEnergie * (0.5 + 1.5 * random.nextDouble()));
+			int powerAvailable = (int)(averagePower * (0.5 + 1.5 * random.nextDouble()));
-			carGrid.chargeCars();
+			final int energieBeforeCharging = powerAvailable;
+			Collections.sort(carGrids, new Comparator<carGrid>() {
+				public int compare(carGrid carGrid1, carGrid carGrid2) {
+					Double carGrid1RelativChargeState = carGrid1.relativeChargeState();
+					Double carGrid2RelativBattery = carGrid2.relativeChargeState();
+					return carGrid1RelativChargeState.compareTo(carGrid2RelativBattery);
+				}
+			});
+			if(powerAvailable < 0) Collections.reverse(carGrids);
+			for(carGrid carGrid : carGrids) {
+				powerAvailable -= carGrid.chargeCars(powerAvailable);
+			}
+			final int chargePower = energieBeforeCharging - powerAvailable;
+			if(chargePower < 0) savedEnergie += Math.abs(chargePower);
+			if(logLevel >= 1) {
+				if(powerAvailable > 0) System.out.println(powerAvailable + " W could not be used by the cars");
+				else if(powerAvailable < 0) System.out.println(Math.abs(powerAvailable) + " W could not be taken from the cars");
+			}
+			for(car car : allCars) {
+				car.tickDrive(hourOfDay);
+			}
 		}
-		System.out.println("vehicle to grid saved " + (double)savedEnergie / 1000 + " kWh with " + carGrid.dockedCars.size() + " cars");
+		System.out.println("vehicle to grid saved " + (double)savedEnergie / 1000 + " kWh with " + allCars.size() + " cars and " + carGrids.size() + " carGrids");
 	}
 }