This is a part of an online Codename One course published around 2017 see it all for free at https://debugagent.com/series/cn1

1. Creating an Uber Clone - Part XV

2. public class LocationService {
private static final short MESSAGE_TYPE_LOCATION_UPDATE = 1;
private static final short MESSAGE_TYPE_DRIVER_POSITIONS = 2;
private static final short MESSAGE_TYPE_AVAILBLE_DRIVER_POSITIONS = 3;
private static final long MAX_UPDATE_FREQUENCY = 3000;
private Location lastKnownLocation;
private SocketConnection server;
private CarAdded carCallback;
private SuccessCallback<Location> locationCallback;
private Map<Long, User> cars = new HashMap<>();
private LocationService() {}
public static void bind(CarAdded carCallback,
SuccessCallback<Location> locationUpdate) {
new LocationService().bindImpl(carCallback, locationUpdate);
}
private void bindImpl(CarAdded carCallback,
SuccessCallback<Location> locationUpdate) {
this.carCallback = carCallback;
locationCallback = locationUpdate;
LocationManager.getLocationManager().
setLocationListener(new LocationListener() {
@Override
LocationService (Client)

3. public class LocationService {
private static final short MESSAGE_TYPE_LOCATION_UPDATE = 1;
private static final short MESSAGE_TYPE_DRIVER_POSITIONS = 2;
private static final short MESSAGE_TYPE_AVAILBLE_DRIVER_POSITIONS = 3;
private static final long MAX_UPDATE_FREQUENCY = 3000;
private Location lastKnownLocation;
private SocketConnection server;
private CarAdded carCallback;
private SuccessCallback<Location> locationCallback;
private Map<Long, User> cars = new HashMap<>();
private LocationService() {}
public static void bind(CarAdded carCallback,
SuccessCallback<Location> locationUpdate) {
new LocationService().bindImpl(carCallback, locationUpdate);
}
private void bindImpl(CarAdded carCallback,
SuccessCallback<Location> locationUpdate) {
this.carCallback = carCallback;
locationCallback = locationUpdate;
LocationManager.getLocationManager().
setLocationListener(new LocationListener() {
@Override
LocationService (Client)

4. public class LocationService {
private static final short MESSAGE_TYPE_LOCATION_UPDATE = 1;
private static final short MESSAGE_TYPE_DRIVER_POSITIONS = 2;
private static final short MESSAGE_TYPE_AVAILBLE_DRIVER_POSITIONS = 3;
private static final long MAX_UPDATE_FREQUENCY = 3000;
private Location lastKnownLocation;
private SocketConnection server;
private CarAdded carCallback;
private SuccessCallback<Location> locationCallback;
private Map<Long, User> cars = new HashMap<>();
private LocationService() {}
public static void bind(CarAdded carCallback,
SuccessCallback<Location> locationUpdate) {
new LocationService().bindImpl(carCallback, locationUpdate);
}
private void bindImpl(CarAdded carCallback,
SuccessCallback<Location> locationUpdate) {
this.carCallback = carCallback;
locationCallback = locationUpdate;
LocationManager.getLocationManager().
setLocationListener(new LocationListener() {
@Override
LocationService (Client)

5. private void bindImpl(CarAdded carCallback,
SuccessCallback<Location> locationUpdate) {
this.carCallback = carCallback;
locationCallback = locationUpdate;
LocationManager.getLocationManager().
setLocationListener(new LocationListener() {
@Override
public void locationUpdated(Location location) {
lastKnownLocation = location;
if(location.getStatus() == LocationManager.AVAILABLE &&
locationCallback != null) {
SuccessCallback<Location> c = locationCallback;
locationCallback = null;
c.onSucess(location);
}
if(server != null) {
server.sendLocationUpdate();
}
}
@Override
public void providerStateChanged(int newState) {
}
});
new SocketConnection().connect();
LocationService (Client)

6. private void bindImpl(CarAdded carCallback,
SuccessCallback<Location> locationUpdate) {
this.carCallback = carCallback;
locationCallback = locationUpdate;
LocationManager.getLocationManager().
setLocationListener(new LocationListener() {
@Override
public void locationUpdated(Location location) {
lastKnownLocation = location;
if(location.getStatus() == LocationManager.AVAILABLE &&
locationCallback != null) {
SuccessCallback<Location> c = locationCallback;
locationCallback = null;
c.onSucess(location);
}
if(server != null) {
server.sendLocationUpdate();
}
}
@Override
public void providerStateChanged(int newState) {
}
});
new SocketConnection().connect();
LocationService (Client)

7. private void bindImpl(CarAdded carCallback,
SuccessCallback<Location> locationUpdate) {
this.carCallback = carCallback;
locationCallback = locationUpdate;
LocationManager.getLocationManager().
setLocationListener(new LocationListener() {
@Override
public void locationUpdated(Location location) {
lastKnownLocation = location;
if(location.getStatus() == LocationManager.AVAILABLE &&
locationCallback != null) {
SuccessCallback<Location> c = locationCallback;
locationCallback = null;
c.onSucess(location);
}
if(server != null) {
server.sendLocationUpdate();
}
}
@Override
public void providerStateChanged(int newState) {
}
});
new SocketConnection().connect();
LocationService (Client)

8. private void bindImpl(CarAdded carCallback,
SuccessCallback<Location> locationUpdate) {
this.carCallback = carCallback;
locationCallback = locationUpdate;
LocationManager.getLocationManager().
setLocationListener(new LocationListener() {
@Override
public void locationUpdated(Location location) {
lastKnownLocation = location;
if(location.getStatus() == LocationManager.AVAILABLE &&
locationCallback != null) {
SuccessCallback<Location> c = locationCallback;
locationCallback = null;
c.onSucess(location);
}
if(server != null) {
server.sendLocationUpdate();
}
}
@Override
public void providerStateChanged(int newState) {
}
});
new SocketConnection().connect();
LocationService (Client)

9. new SocketConnection().connect();
}
class SocketConnection extends WebSocket {
private double lat, lon;
private float direction;
private long lastUpdateTime;
private EasyThread et;
public SocketConnection() {
super(Globals.SERVER_SOCKET_URL);
et = EasyThread.start("Websocket");
}
@Override
protected void onOpen() {
server = this;
sendLocationUpdate();
}
public void sendLocationUpdate() {
if(!et.isThisIt()) {
et.run(() -> sendLocationUpdate());
return;
}
if(lastKnownLocation != null) {
double lt = lastKnownLocation.getLatitude();
double ll = lastKnownLocation.getLongitude();
LocationService (Client)

10. new SocketConnection().connect();
}
class SocketConnection extends WebSocket {
private double lat, lon;
private float direction;
private long lastUpdateTime;
private EasyThread et;
public SocketConnection() {
super(Globals.SERVER_SOCKET_URL);
et = EasyThread.start("Websocket");
}
@Override
protected void onOpen() {
server = this;
sendLocationUpdate();
}
public void sendLocationUpdate() {
if(!et.isThisIt()) {
et.run(() -> sendLocationUpdate());
return;
}
if(lastKnownLocation != null) {
double lt = lastKnownLocation.getLatitude();
double ll = lastKnownLocation.getLongitude();
LocationService (Client)

11. new SocketConnection().connect();
}
class SocketConnection extends WebSocket {
private double lat, lon;
private float direction;
private long lastUpdateTime;
private EasyThread et;
public SocketConnection() {
super(Globals.SERVER_SOCKET_URL);
et = EasyThread.start("Websocket");
}
@Override
protected void onOpen() {
server = this;
sendLocationUpdate();
}
public void sendLocationUpdate() {
if(!et.isThisIt()) {
et.run(() -> sendLocationUpdate());
return;
}
if(lastKnownLocation != null) {
double lt = lastKnownLocation.getLatitude();
double ll = lastKnownLocation.getLongitude();
LocationService (Client)

12. new SocketConnection().connect();
}
class SocketConnection extends WebSocket {
private double lat, lon;
private float direction;
private long lastUpdateTime;
private EasyThread et;
public SocketConnection() {
super(Globals.SERVER_SOCKET_URL);
et = EasyThread.start("Websocket");
}
@Override
protected void onOpen() {
server = this;
sendLocationUpdate();
}
public void sendLocationUpdate() {
if(!et.isThisIt()) {
et.run(() -> sendLocationUpdate());
return;
}
if(lastKnownLocation != null) {
double lt = lastKnownLocation.getLatitude();
double ll = lastKnownLocation.getLongitude();
LocationService (Client)

13. new SocketConnection().connect();
}
class SocketConnection extends WebSocket {
private double lat, lon;
private float direction;
private long lastUpdateTime;
private EasyThread et;
public SocketConnection() {
super(Globals.SERVER_SOCKET_URL);
et = EasyThread.start("Websocket");
}
@Override
protected void onOpen() {
server = this;
sendLocationUpdate();
}
public void sendLocationUpdate() {
if(!et.isThisIt()) {
et.run(() -> sendLocationUpdate());
return;
}
if(lastKnownLocation != null) {
double lt = lastKnownLocation.getLatitude();
double ll = lastKnownLocation.getLongitude();
LocationService (Client)

14. public void sendLocationUpdate() {
if(!et.isThisIt()) {
et.run(() -> sendLocationUpdate());
return;
}
if(lastKnownLocation != null) {
double lt = lastKnownLocation.getLatitude();
double ll = lastKnownLocation.getLongitude();
float dir = lastKnownLocation.getDirection();
if(ll == lon && lt == lat && dir == direction) {
return;
}
long time = System.currentTimeMillis();
if(time - lastUpdateTime < MAX_UPDATE_FREQUENCY) {
return;
}
lastUpdateTime = time;
lon = ll;
lat = lt;
direction = dir;
try(ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bos);) {
dos.writeShort(MESSAGE_TYPE_LOCATION_UPDATE);
String token = Preferences.get("token", null);
LocationService (Client)

15. public void sendLocationUpdate() {
if(!et.isThisIt()) {
et.run(() -> sendLocationUpdate());
return;
}
if(lastKnownLocation != null) {
double lt = lastKnownLocation.getLatitude();
double ll = lastKnownLocation.getLongitude();
float dir = lastKnownLocation.getDirection();
if(ll == lon && lt == lat && dir == direction) {
return;
}
long time = System.currentTimeMillis();
if(time - lastUpdateTime < MAX_UPDATE_FREQUENCY) {
return;
}
lastUpdateTime = time;
lon = ll;
lat = lt;
direction = dir;
try(ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bos);) {
dos.writeShort(MESSAGE_TYPE_LOCATION_UPDATE);
String token = Preferences.get("token", null);
LocationService (Client)

16. public void sendLocationUpdate() {
if(!et.isThisIt()) {
et.run(() -> sendLocationUpdate());
return;
}
if(lastKnownLocation != null) {
double lt = lastKnownLocation.getLatitude();
double ll = lastKnownLocation.getLongitude();
float dir = lastKnownLocation.getDirection();
if(ll == lon && lt == lat && dir == direction) {
return;
}
long time = System.currentTimeMillis();
if(time - lastUpdateTime < MAX_UPDATE_FREQUENCY) {
return;
}
lastUpdateTime = time;
lon = ll;
lat = lt;
direction = dir;
try(ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bos);) {
dos.writeShort(MESSAGE_TYPE_LOCATION_UPDATE);
String token = Preferences.get("token", null);
LocationService (Client)

17. try(ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bos);) {
dos.writeShort(MESSAGE_TYPE_LOCATION_UPDATE);
String token = Preferences.get("token", null);
dos.writeShort(token.length());
for(int iter = 0 ; iter < token.length() ; iter++) {
dos.writeByte((byte)token.charAt(iter));
}
dos.writeDouble(lat);
dos.writeDouble(lon);
dos.writeFloat(dir);
dos.writeDouble(1);
dos.writeByte(0);
dos.flush();
send(bos.toByteArray());
} catch(IOException err) {
Log.e(err);
}
}
}
@Override
protected void onClose(int i, String string) {
Log.p("Connection closed! Error... "
LocationService (Client)

18. try(ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bos);) {
dos.writeShort(MESSAGE_TYPE_LOCATION_UPDATE);
String token = Preferences.get("token", null);
dos.writeShort(token.length());
for(int iter = 0 ; iter < token.length() ; iter++) {
dos.writeByte((byte)token.charAt(iter));
}
dos.writeDouble(lat);
dos.writeDouble(lon);
dos.writeFloat(dir);
dos.writeDouble(1);
dos.writeByte(0);
dos.flush();
send(bos.toByteArray());
} catch(IOException err) {
Log.e(err);
}
}
}
@Override
protected void onClose(int i, String string) {
Log.p("Connection closed! Error... "
LocationService (Client)

19. try(ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(bos);) {
dos.writeShort(MESSAGE_TYPE_LOCATION_UPDATE);
String token = Preferences.get("token", null);
dos.writeShort(token.length());
for(int iter = 0 ; iter < token.length() ; iter++) {
dos.writeByte((byte)token.charAt(iter));
}
dos.writeDouble(lat);
dos.writeDouble(lon);
dos.writeFloat(dir);
dos.writeDouble(1);
dos.writeByte(0);
dos.flush();
send(bos.toByteArray());
} catch(IOException err) {
Log.e(err);
}
}
}
@Override
protected void onClose(int i, String string) {
Log.p("Connection closed! Error... "
LocationService (Client)

20. @Override
protected void onClose(int i, String string) {
Log.p("Connection closed! Error... "
+ "trying to reconnect in 5 seconds");
UITimer.timer(5000, false, () -> connect());
}
@Override
protected void onMessage(String string) {
}
@Override
protected void onMessage(byte[] bytes) {
try {
DataInputStream dis = new DataInputStream(
new ByteArrayInputStream(bytes));
short response = dis.readShort();
int size = dis.readInt();
for(int iter = 0 ; iter < size ; iter++) {
long id = dis.readLong();
User car = cars.get(id);
if(car == null) {
car = new User().
id.set(id).
latitude.set(dis.readDouble()).
longitude.set(dis.readDouble()).
LocationService (Client)

21. @Override
protected void onClose(int i, String string) {
Log.p("Connection closed! Error... "
+ "trying to reconnect in 5 seconds");
UITimer.timer(5000, false, () -> connect());
}
@Override
protected void onMessage(String string) {
}
@Override
protected void onMessage(byte[] bytes) {
try {
DataInputStream dis = new DataInputStream(
new ByteArrayInputStream(bytes));
short response = dis.readShort();
int size = dis.readInt();
for(int iter = 0 ; iter < size ; iter++) {
long id = dis.readLong();
User car = cars.get(id);
if(car == null) {
car = new User().
id.set(id).
latitude.set(dis.readDouble()).
longitude.set(dis.readDouble()).
LocationService (Client)

22. long id = dis.readLong();
User car = cars.get(id);
if(car == null) {
car = new User().
id.set(id).
latitude.set(dis.readDouble()).
longitude.set(dis.readDouble()).
direction.set(dis.readFloat());
cars.put(id, car);
User finalCar = car;
callSerially(() -> carCallback.carAdded(finalCar));
} else {
car.latitude.set(dis.readDouble()).
longitude.set(dis.readDouble()).
direction.set(dis.readFloat());
}
}
} catch(IOException err) {
Log.e(err);
}
}
protected void onError(Exception e) {
Log.e(e);
}
LocationService (Client)

23. long id = dis.readLong();
User car = cars.get(id);
if(car == null) {
car = new User().
id.set(id).
latitude.set(dis.readDouble()).
longitude.set(dis.readDouble()).
direction.set(dis.readFloat());
cars.put(id, car);
User finalCar = car;
callSerially(() -> carCallback.carAdded(finalCar));
} else {
car.latitude.set(dis.readDouble()).
longitude.set(dis.readDouble()).
direction.set(dis.readFloat());
}
}
} catch(IOException err) {
Log.e(err);
}
}
protected void onError(Exception e) {
Log.e(e);
}
LocationService (Client)

24. latitude.set(dis.readDouble()).
longitude.set(dis.readDouble()).
direction.set(dis.readFloat());
cars.put(id, car);
User finalCar = car;
callSerially(() -> carCallback.carAdded(finalCar));
} else {
car.latitude.set(dis.readDouble()).
longitude.set(dis.readDouble()).
direction.set(dis.readFloat());
}
}
} catch(IOException err) {
Log.e(err);
}
}
protected void onError(Exception e) {
Log.e(e);
}
}
public static interface CarAdded {
void carAdded(User driver);
}
}
LocationService (Client)