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OOD - Elevator System

Last edited: January 1, 2026

1. Problem Statement
2. System Requirements
3. Use Case Diagram
4. Class Diagram
5. Activity Diagrams
Hall Call Processing
Elevator Movement Cycle
Emergency Stop Handling
6. Java Implementation
7. Design Patterns Applied
1. State Pattern (Elevator State Machine)
2. Strategy Pattern (Scheduler)
3. Command Pattern (Request Abstraction)
4. Observer Pattern (Request Processing - Implicit)
5. Factory Pattern (Elevator Creation)
6. Singleton Pattern (ElevatorController - Optional)
8. Key Design Decisions
Decision 1: State Machine with Explicit States
Decision 2: Separate Hall and Car Requests
Decision 3: Queue-Based Destination Management
Decision 4: Scheduler Strategy Pattern
Decision 5: Periodic Movement Updates
Decision 6: Door Obstruction Handling
Decision 7: Cost-Based Elevator Selection
Decision 8: Pending Request Queue
Decision 9: Emergency and Maintenance States
Decision 10: Concurrent Execution Model
9. Additional Considerations
2. Use Case Diagram
3. Class Diagram
4. Activity Diagrams
5. High-Level Code Implementation
Java (skeleton)
Python (skeleton, type-hinted)

Related Tags

ood-object-oriented-design elevator scheduling state-machine

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