103 lines
2.5 KiB
Markdown
103 lines
2.5 KiB
Markdown
# Refactoring History—MediaManager Core
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This document records the refactorings applied during development.
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## Refactoring #1: Connection Pool Implementation
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**Date**: 2025-11-13
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**Commits**: ```22476abb27d95e88ae0439d97ef97467b6a4f985```
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### Problem Identified
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- Database connections were created multiple times
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- No centralized control
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- Possible resource leaks
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### Technique Applied
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- **Pattern**: Singleton Pattern
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- **Refactoring**: Extract Class + Introduce Singleton
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### Solution
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Created `DatabaseManager` class that:
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- Maintains single instance (Singleton)
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- Manages connection pool
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- Provides centralized `getConnection()` method
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### Result
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- ✅ Single reusable connection
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- ✅ Code centralized in one class
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- ✅ Thread-safe
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- ✅ Easier to test
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### Extracted Component
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`DatabaseManager` - available in `mediamanager-components`
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---
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## Refactoring #2: Thread Pool for IPC
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**Date**: 2025-11-14
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**Commits**: ```f1071dca03da33f7355a6927497509b5aedaa4a2```
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### Problem Identified
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- New thread created for each IPC client
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- Doesn't scale well
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- Thread creation overhead
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### Technique Applied
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- **Pattern**: Thread Pool Pattern
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- **Refactoring**: Replace Thread Creation with Thread Pool
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### Solution
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Implemented `ExecutorService` with:
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- Fixed thread pool
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- Thread reuse
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- Ordered shutdown
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### Result
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- ✅ Better performance
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- ✅ Controlled resource usage
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- ✅ Scalability
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### Extracted Component
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`IPCServer` - available in `mediamanager-components`
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---
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## Refactoring #3: Graceful Shutdown
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**Date**: 2025-11-13
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**Commits**: ```65e14930076db71a312feae373d6c5daee3c4d29```,```b7ff9d1e16c85bf986a770676827bee390f0d53c```
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### Problem Identified
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- Resources weren't released on exit
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- Database connections remained open
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- Thread pool didn't terminate correctly
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### Technique Applied
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- **Pattern**: Shutdown Hook Pattern
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- **Refactoring**: Introduce Shutdown Protocol
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### Solution
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Implemented shutdown hooks that:
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- Close database connections
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- Terminate thread pools
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- Release sockets
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- In specific order with timeouts
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### Result
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- ✅ Ordered cleanup
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- ✅ No resource leaks
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- ✅ Shutdown logging
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- ✅ Timeout to prevent hanging
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### Extracted Component
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Logic incorporated in `DatabaseManager` and `IPCServer`
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---
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## Applied Principles
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- **DRY** (Don't Repeat Yourself): Elimination of duplicated code
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- **SOLID**: Especially Single Responsibility Principle
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- **Design Patterns**: Singleton, Thread Pool, Shutdown Hook
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- **Clean Code**: Clear names, small methods, well-defined responsibilities |