ride-sharing-service.md

Designing a Ride-Sharing Service Like Uber

This article explores the object-oriented design and implementation of a Ride-Sharing Service similar to Uber using Java.

We focus on the various aspects of ride-sharing, including user and driver management, ride booking, and fare calculation.

System Requirements

The Ride-Sharing Service should:

1. User and Driver Account Management: Handle the registration and profiles of users and drivers.
2. Ride Booking: Enable users to book rides and drivers to accept them.
3. Fare Calculation: Compute fares based on distance and other factors.
4. Ride History Management: Keep a record of past rides for users and drivers.

Core Use Cases

1. Registering and Managing User and Driver Accounts
2. Booking and Managing Rides
3. Calculating and Processing Fares
4. Maintaining Ride History

Key Classes:

• RideSharingService: Manages the overall system.
• User: Represents a service user.
• Driver: Represents a driver.
• Ride: Manages ride details.
• FareCalculator: Calculates ride fares.

Java Implementation

User Class

Manages user account information.

public class User {
    private String userId;
    private String name;
    private String phone;

    public User(String userId, String name, String phone) {
        this.userId = userId;
        this.name = name;
        this.phone = phone;
    }

    // Getters and setters...
}

Driver Class

Represents a driver in the system.

public class Driver {
    private String driverId;
    private String name;
    private String vehicleDetails;

    public Driver(String driverId, String name, String vehicleDetails) {
        this.driverId = driverId;
        this.name = name;
        this.vehicleDetails = vehicleDetails;
    }

    // Getters and setters...
}

Ride Class

Manages ride details.

import java.util.Date;

public class Ride {
    private String rideId;
    private User user;
    private Driver driver;
    private Date rideDate;
    private double fare;

    public Ride(String rideId, User user, Driver driver, Date rideDate) {
        this.rideId = rideId;
        this.user = user;
        this.driver = driver;
        this.rideDate = rideDate;
    }

    public void setFare(double fare) {
        FareCalculator fareCalculator = new FareCalculator();
        this.fare = fareCalculator.calculateFare(distance, duration);
    }

    // Getters and setters...
}

FareCalculator Class

Calculates the fare of a ride.

public class FareCalculator {
    private static final double BASE_FARE = 2.50; // Base fare for a ride
    private static final double COST_PER_MILE = 1.50; // Cost per mile
    private static final double COST_PER_MINUTE = 0.25; // Cost per minute

    public double calculateFare(double distanceInMiles, double durationInMinutes) {
        double distanceCharge = distanceInMiles * COST_PER_MILE;
        double timeCharge = durationInMinutes * COST_PER_MINUTE;
        return BASE_FARE + distanceCharge + timeCharge;
    }
}

RideSharingService Class

Manages the ride-sharing service operations.

import java.util.ArrayList;
import java.util.List;
import java.util.Date;

public class RideSharingService {
    private List<User> users;
    private List<Driver> drivers;
    private List<Ride> rides;

    public RideSharingService() {
        this.users = new ArrayList<>();
        this.drivers = new ArrayList<>();
        this.rides = new ArrayList<>();
    }

    public Ride bookRide(User user, Driver driver, Date rideDate) {
        Ride newRide = new Ride(generateRideId(), user, driver, rideDate);
        FareCalculator fareCalculator = new FareCalculator();
        double fare = fareCalculator.calculateFare(newRide);
        newRide.setFare(fare);
        rides.add(newRide);
        return newRide;
    }

    private String generateRideId() {
        return "RIDE_" + System.currentTimeMillis();
    }