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OOD - Online Stock Brokerage System

hardLast edited: January 1, 2026

Problem
Solution
1. Requirements Analysis
2. Use Case Diagram
3. Class Diagram
4. Activity Diagrams
Activity: Place Limit Order
Activity: Cancel Order
5. High-Level Code Implementation
Java
Python
1. Problem Statement
2. System Requirements
3. Use Case Diagram
4. Class Diagram
5. Activity Diagrams
Activity Diagram 1: Place Limit Order
Activity Diagram 2: Cancel Order
Activity Diagram 3: Deposit Funds via ACH
6. Java Implementation
7. Python Implementation
8. Key Design Decisions
1. State Pattern for Order Lifecycle Management
2. Strategy Pattern for Cost Basis Calculation Methods
3. Observer Pattern for Real-Time Market Data Distribution
4. Factory Pattern for Order Creation
5. Repository Pattern for Data Access Layer
6. Append-Only Order Log for Regulatory Compliance
7. Optimistic Locking for Concurrent Order Handling
8. Circuit Breaker for Exchange Connectivity
9. Event Sourcing for Account Transactions
10. CQRS for Portfolio Queries vs Commands

Related Tags

stock-brokerage design

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