Meeting Room Reservation Platform 

Design the low-level system for a Meeting Room Reservation Platform that allows employees in an organization to book rooms for meetings, check availability, and manage bookings.

The system should support the following core features:

Requirements:

Functional Requirements:

1. An employee can view all available meeting rooms for a given time interval.
2. An employee can book a meeting room if it is free during the requested time.
3. Ability to cancel an existing meeting.
4. Handle overlapping meeting requests gracefully.
5. Ability to list all meetings scheduled for a given room or employee.
6. Support recurring meetings (optional enhancement).

Entities Involved:

• Employee
• MeetingRoom
• Booking
• TimeSlot or Interval

  Operations:
• bookRoom(employeeId, roomId, startTime, endTime)
• getAvailableRooms(startTime, endTime)
• cancelBooking(bookingId)
• listBookingsForRoom(roomId)
• listBookingsForEmployee(employeeId)

Constraints to Consider:

• No double-booking of the same room at overlapping times.
• Extensibility for many rooms and bookings.
• Concurrency: Handle race conditions where two users try to book the same room at the same time.

Design Expectations:

• Define classes with proper responsibilities.
• Handle edge cases (invalid time range, no available rooms, overlapping bookings).

Example Scenario:

• Room A is booked from 10:00 AM to 11:00 AM.
• User X tries to book Room A from 10:30 AM to 11:30 AM → Booking should fail due to overlap.
• User Y books Room B from 10:30 AM to 11:30 AM → Booking successful.

Entities/Domain Objects

TimeSlot

• startTime: LocalDateTime — start time of the interval
• endTime: LocalDateTime — end time of the interval
  Key Methods:
• overlaps(other: TimeSlot): boolean — checks if this time slot overlaps with another

Employee

• employeeId: String — unique identifier for the employee
• name: String — employee's full name
• email: String — employee's email address

MeetingRoom

• roomId: String — unique identifier for the room
• name: String — name of the meeting room
• capacity: int — maximum number of people the room can accommodate
• location: String — physical location of the room (e.g., "Floor 1")

BookingStatus (Enum)

• ACTIVE — booking is active and confirmed
• CANCELLED — booking has been cancelled
• COMPLETED — booking time has passed

Booking

• bookingId: String — unique identifier for the booking (auto-generated)
• employeeId: String — ID of the employee who made the booking
• roomId: String — ID of the booked meeting room
• timeSlot: TimeSlot — time interval for the booking
• createdAt: LocalDateTime — timestamp when booking was created
• status: BookingStatus — current status of the booking (ACTIVE, CANCELLED, COMPLETED)
  Key Methods:
• overlaps(timeSlot: TimeSlot): boolean — checks if booking overlaps with given time slot (only for active bookings)
• isActive(): boolean — returns true if booking status is ACTIVE
• isCancelled(): boolean — returns true if booking status is CANCELLED

Service/ Repository layer

BookingService
EmployeeService
MeetingRoomService