Low Level Design (LLD): Ride Sharing Application | Swiggy / MMT

Problem Statement

The application allows users to share rides on a route.

• Users can either offer a shared ride (Driver) or consume a shared ride (Passenger).
• Users can search and select one from multiple available rides on a route with the same source and destination.

Usecases:

• Application should allow to register users:
  create_user(name:"John",gender:M,age:26)
• Users should be able to add vehicle (a user can have multiple vehicles):
  create_vehicle(name:"John", vehicle:"swift", regNo:"KA-09-32321")
• Users should be able offer rides:
  offer_ride(name: "John", vehicle: "swift", seats_available: 3, origin: Bangalore, destination: Mysore, start: 'March 21, 2024, 10 AM', duration: 3h)
• Users should be able to select rides based on origin, destination, and selection preference:
  select_ride(name:"smith",origin:bangalore,destination:mysore,seats_requierd:2,earliest_ending_ride)

Users can have preferences like:

• Earliest ending ride or lowest duration ride
• Preferred Vehicle (Activa/Polo/XUV)
• Most Vacant.

Users should be able to get all the rides offered and taken by the user.

Solution ->

Video link - https://youtu.be/SOZ69p16pmw?si=yvb2Jn3V_FkI4lvo

Entities Involved

• User
• Vehicle
• Ride
• RideStatus
• VehicleType

Service

• UserService
• VehicleService
• RideService

Repository

• UserRepository
• VehicleRepository
• RideRepository

Ride Strategies

• RideStrategy -> selectRide(List<Ride> rides)
• EarliestEndingRideStrategy
• LowestDurationRideStrategy
• MostVacantRideStrategy
• PreferredVehicleRideStrategy

RideSharingFacade

RideSharingDemo

Entitiy Fields

1. User Entity

• name (String)
• gender (String)
• age (int)

Vehicle Entity

• vehicleOwnerName (String)
• vehicleName (String)
• vehicleType (VehicleType - optional)
• regNo (String)

Ride Entity

• ride_id (String)
• origin (String)
• destination (String)
• vehicleForRide (Vehicle)
• totalSeatsForRide (Integer)
• rideStatus (RideStatus)
• rideUser (User)
• rideFare (Integer - optional)
• startTime (LocalDateTime)
• durationHours (Integer)
• Plus computed field: endTime (via getEndTime() method)

RideStatus Enum

• START, IN_PROGRESS, COMPLETE

VehicleType Enum

• CAR, BIKE