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Low Level Design (LLD) Coding

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Design (LLD) Ride sharing service - Machine Coding

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techlinks.in
·Dec 30, 2022·

4 min read

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Low-level design (LLD) for a ride-sharing service:

  1. User accounts and authentication: The service will need to allow users to create accounts, log in, and log out. We will also need to implement measures to ensure the security of user accounts, such as password hashing and potentially two-factor authentication.

  2. Rider and driver profiles: The service will need to store information about the riders and drivers, including their contact information, preferred payment methods, and ratings. This will likely involve creating separate tables or data structures for riders and drivers, with fields to store the relevant information.

  3. Ride request and matching: The service will need to allow riders to request rides and drivers to accept or decline requests. This will involve creating forms and handling the associated server-side logic to match riders with nearby drivers.

  4. Payment processing: The service will need to handle payment from riders to drivers, including processing and validating payment methods such as credit cards or mobile payments.

  5. Rating and review system: The service will need to allow riders and drivers to rate and review each other after a ride is completed. This will involve creating forms and handling the associated server-side logic to store and display the ratings and reviews.

  6. User interface: Finally, we will need to design the user interface for the service, including the layout, navigation, and any necessary graphics or styling. This will involve creating wireframes and mockups, as well as implementing the front-end code to bring the design to life.

Here is a possible low-level design (LLD) for a ride-sharing service in Java:

public class RideSharingService {
    private UserDatabase userDatabase;
    private DriverDatabase driverDatabase;
    private RideDatabase rideDatabase;
    private PaymentProcessor paymentProcessor;
    private RatingService ratingService;
    private NotificationService notificationService;

    public RideSharingService() {
        userDatabase = new UserDatabase();
        driverDatabase = new DriverDatabase();
        rideDatabase = new RideDatabase();
        paymentProcessor = new PaymentProcessor();
        ratingService = new RatingService();
        notificationService = new NotificationService();
    }

    public void signUpUser(User user) {
        userDatabase.addUser(user);
    }

    public void signUpDriver(Driver driver) {
        driverDatabase.addDriver(driver);
    }

    public void requestRide(String userId, Location pickupLocation) {
        User user = userDatabase.getUser(userId);
        if (user == null) {
            throw new IllegalArgumentException("Invalid user id");
        }
        Ride ride = new Ride(user, pickupLocation);
        rideDatabase.addRide(ride);
        Driver driver = driverDatabase.getNearestDriver(pickupLocation);
        if (driver == null) {
            notificationService.notifyNoDriversAvailable(user);
            return;
        }
        driver.acceptRide(ride);
        notificationService.notifyRideAccepted(user, driver);
    }

    public void cancelRide(String rideId) {
        Ride ride = rideDatabase.getRide(rideId);
        if (ride == null) {
            throw new IllegalArgumentException("Invalid ride id");
        }
        User user = ride.getUser();
        Driver driver = ride.getDriver();
        if (driver != null) {
            driver.cancelRide(ride);
            notificationService.notifyRideCanceled(user, driver);
        }
        rideDatabase.removeRide(ride);
    }

    public void completeRide(String rideId, Location dropoffLocation, float distance) {
        Ride ride = rideDatabase.getRide(rideId);
        if (ride == null) {
            throw new IllegalArgumentException("Invalid ride id");
        }
        User user = ride.getUser();
        Driver driver = ride.getDriver();
        float price = calculatePrice(distance);
        paymentProcessor.processPayment(user, driver, price);
        ride.setDropoffLocation(dropoffLocation);
        ride.setDistance(distance);
        ride.setPrice(price);
        rideDatabase.updateRide(ride);
        ratingService.addRating(user, driver, ride);
        notificationService.notifyRideCompleted(user, driver);
    }

    private float calculatePrice(float distance) {
        // Calculate the price based on the distance and other factors
    }
}
public class UserDatabase {
    private Map<String, User> users;

    public UserDatabase() {
        users = new HashMap<>();
    }

    public void addUser(User user) {
        users.put(user.getId(), user);
    }

    public User getUser(String id) {
        return users.get(id);
    }
}
public class DriverDatabase {
    private Map<String, Driver> drivers;

    public DriverDatabase() {
        drivers = new HashMap<>();
    }

    public void addDriver(Driver driver) {
        drivers.put(driver.getId(), driver);
    }

    public Driver getDriver(String id) {
        return drivers.get(id);
    }

    public Driver getNearestDriver(Location location) {
        // Return the nearest available driver
    }
}
public class RideDatabase {
    private Map<String, Ride> rides;

    public RideDatabase() {
        rides = new HashMap<>();
    }

    public void addRide(Ride ride) {
        rides.put(ride.getId(), ride);
    }

    public Ride getRide(String id) {
        return rides.get(id);
    }

    public void updateRide(Ride ride) {
        rides.put(ride.getId(), ride);
    }

    public void removeRide(Ride ride) {
        rides.remove(ride.getId());
    }
}
public class PaymentProcessor {
    public void processPayment(User user, Driver driver, float amount) {
        // Process the payment from the user to the driver
    }
}
public class RatingService {
    public void addRating(User user, Driver driver, Ride ride) {
        // Add the rating from the user to the driver
    }
}
public class NotificationService {
    public void notifyNoDriversAvailable(User user) {
        // Send a notification to the user that no drivers are available
    }

    public void notifyRideAccepted(User user, Driver driver) {
        // Send a notification to the user that their ride has been accepted by the driver
    }

    public void notifyRideCanceled(User user, Driver driver) {
        // Send a notification to the user and the driver that the ride has been canceled
    }

    public void notifyRideCompleted(User user, Driver driver) {
        // Send a notification to the user and the driver that the ride has been completed
    }
}

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