Design A Hotel Booking System - System Design

My Solution for Design a Hotel Booking System with Score

by nectar4678

Requirements

The hotel booking system will serve as a platform for users to search for and book hotel rooms. Key features include:

Search and Availability Management: Users can search for hotels based on location, date range, room type, and price range. Availability checks will ensure accurate search results.
Conflict-Free Booking: Implement robust mechanisms to avoid double bookings and handle concurrent booking requests.
Cancellation Policies: Cancellations will include logic for policies (e.g., non-refundable, partially refundable) and fee calculations.
Payment Processing: Payments will include detailed statuses (Pending, Failed, Completed) and manage refunds for cancellations.
User Roles and Permissions: Differentiate access and actions for customers, admins, and hotel managers. Implement authentication and role-based authorization.
Dynamic Seasonal Pricing: Seasonal pricing updates will be triggered dynamically based on predefined rules or sudden demand changes.
User-Friendly Experience: Provide a dashboard for users to view booking history, current reservations, and cancellation options.
Scalability and Concurrency: Ensure the system supports high traffic and concurrent operations without degradation in performance.

Define Core Objects

The system's main objects include:

User: Represents the customer with booking and cancellation functionalities.
Admin: Manages hotels, rooms, bookings, and seasonal pricing.
HotelManager: Oversees room inventory and hotel-specific settings.
Room: Represents a room in a hotel with attributes like type, price, and availability schedule.
Booking: Represents a reservation, including booking status and associated policies.
Payment: Manages detailed payment statuses and refunds.
SeasonalPricing: Implements dynamic pricing based on triggers or events.

Analyze Relationships

A User makes multiple Bookings, and each Booking is associated with a single Room.
Admins can manage all objects in the system, while HotelManagers manage specific hotels and their rooms.
Payments are tied to Bookings, with updates based on booking or cancellation policies.
SeasonalPricing dynamically modifies the Room price based on triggers.

Establish Hierarchy

To promote code reuse and flexibility:

A User makes multiple Bookings, and each Booking is associated with a single Room.
Admins can manage all objects in the system, while HotelManagers manage specific hotels and their rooms.
Payments are tied to Bookings, with updates based on booking or cancellation policies.
SeasonalPricing dynamically modifies the Room price based on triggers.

Design Patterns

Singleton Pattern: Ensure a single instance of admin settings and configurations.
Factory Pattern: Create dynamic room instances based on user input.
Observer Pattern: Notify users about booking changes or price updates.
Strategy Pattern: Handle dynamic pricing and cancellation policy logic.

Define Class Members (write code)

class User:
    def __init__(self, user_id, name, email):
        self.user_id = user_id
        self.name = name
        self.email = email
        self.bookings = []

    def search_rooms(self, location, check_in, check_out, room_type):
        # Placeholder for searching logic
        available_rooms = RoomManager.get_available_rooms(location, check_in, check_out, room_type)
        return available_rooms

    def make_booking(self, room, check_in, check_out):
        if room.is_available(check_in, check_out):
            booking = Booking(self, room, check_in, check_out)
            self.bookings.append(booking)
            room.mark_unavailable(check_in, check_out)
            return booking
        else:
            raise Exception("Room is unavailable for the selected dates.")

    def cancel_booking(self, booking_id):
        booking = next((b for b in self.bookings if b.booking_id == booking_id), None)
        if booking:
            if booking.policy.allows_cancellation():
                booking.cancel()
                return f"Booking {booking_id} has been cancelled."
            else:
                raise Exception("Cancellation policy does not allow cancellation.")

class Room:
    def __init__(self, room_id, room_type, price, availability_calendar):
        self.room_id = room_id
        self.room_type = room_type
        self.price = price
        self.availability_calendar = availability_calendar  # Dictionary with dates and availability status

    def is_available(self, check_in, check_out):
        return all(self.availability_calendar.get(date, False) for date in range(check_in, check_out))

    def mark_unavailable(self, check_in, check_out):
        for date in range(check_in, check_out):
            self.availability_calendar[date] = False

class Booking:
    def __init__(self, user, room, check_in, check_out):
        self.booking_id = generate_unique_id()
        self.user = user
        self.room = room
        self.check_in = check_in
        self.check_out = check_out
        self.status = "Confirmed"
        self.policy = CancellationPolicy()
        self.payment = Payment(self)

    def cancel(self):
        self.status = "Cancelled"
        self.payment.process_refund()

class Payment:
    def __init__(self, booking):
        self.payment_id = generate_unique_id()
        self.amount = booking.room.price * (booking.check_out - booking.check_in)
        self.status = "Pending"

    def process_payment(self, method):
        # Payment logic goes here
        self.status = "Completed"

    def process_refund(self):
        # Refund logic
        self.status = "Refunded"

class SeasonalPricing:
    def __init__(self, season, multiplier):
        self.season = season
        self.multiplier = multiplier

    def calculate_price(self, base_price):
        return base_price * self.multiplier

class CancellationPolicy:
    def allows_cancellation(self):
        # Logic for checking refundability
        return True

Adhere to SOLID Guidelines

Conflict-Free Booking: The is_available and mark_unavailable methods prevent double booking.
Cancellations: The CancellationPolicy class handles refund and cancellation rules.
Payment Processing: Enhanced with detailed statuses and refund logic.
Extensibility: Additional user roles and dynamic room subclasses allow scaling.
Concurrency: A RoomManager can implement thread-safe operations to handle concurrent booking requests.

Consider Scalability and Flexibility

The design can handle growth by:

Introducing caching for search results to improve performance.
Implementing load balancing for high traffic.
Expanding payment gateways or adding loyalty programs.
Allowing hotels to manage their own room inventory and pricing.

Create/Explain your diagram(s)

Here’s a simple class diagram for the system:

Future improvements

AI-Based Personalization: Recommend hotels based on user preferences and past behavior.
Regional Pricing Rules: Adjust seasonal pricing dynamically based on geographic demand trends.
Integrated Customer Support: Add support chat for real-time issue resolution.
Concurrency Optimization: Use distributed systems for availability checks and booking operations.
Enhanced Admin Tools: Provide dashboards for analytics and system health monitoring.

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