Implement Room Database Singleton for Todo App

[Jesco39967]

Implement Room Database Singleton for Todo App

Description

Task

Create Room Database Instance: Implement the Room database instance as a singleton, providing a centralized access point for database operations. This ensures a single, consistent database connection throughout the app.

Acceptance Criteria

• Database can be instantiated only once
• Singleton pattern prevents multiple database connections
• Thread-safe database instance creation
• Consistent database access across the application
• Efficient and optimized database connection management

Summary of Work

This pull request implements a robust, thread-safe Room Database singleton for the Todo application, providing a centralized and efficient database access mechanism.

Key Implementation Details:

• Created singleton TodoDatabase using companion object
• Implemented thread-safe instance creation with synchronized block
• Used double-checked locking pattern for optimal performance
• Added fallback migration strategy for database version changes

Database Configuration:

• Database Name: "todo_database"
• Version: 1
• Entities: TodoItem
• Export Schema: Disabled

Singleton Creation Mechanism:

• @Volatile annotation ensures visibility across threads
• synchronized block prevents race conditions during instance creation
• Lazy initialization with double-checked locking

Thread Safety Considerations:

• Guarantees only one database instance is created
• Prevents potential memory leaks and resource contention
• Ensures consistent database state across application lifecycle

Performance Optimizations:

• Uses applicationContext to prevent memory leaks
• Efficient instance retrieval with minimal overhead
• Supports future migration strategies

Testing Approach:

• Verified singleton behavior
• Ensured thread-safe instance creation
• Confirmed database instance consistency

Changes Made

• Implemented TodoDatabase singleton in app/src/main/java/com/todoapp/data/database/TodoDatabase.kt
• Added thread-safe instance creation mechanism
• Configured Room database with fallback migration strategy
• Documented database creation and retrieval process

Tests

• Verify singleton instance is consistently returned
• Confirm thread-safe database instance creation
• Test database instance across multiple threads
• Validate database configuration and entity mapping

Signatures

Staking Key

J6tTgkf9kkp5Q3TW2YRSCN8hk8xgEDywW1vTY5pYvodM: DTbzPtVpBjX7CqTYYykvYtRYD6mAuoVuQj4SpQqRcw8WYMh2gEXZLvx6J3BpNfPY9yRcth6HpdGPr8JUVo6jKUu3sVEejDDqPGD263zxV9HdiJawAhUKtt3hcawCzb23P3vZ4fN5ebsAoXqgh3TMwgsbY7m7ceCbrQRqXHkSh5WK7dypo2ywJri4MHAeoVBQ38BRpfuaKQb3n5dPoicop1hiG7hg4HPXKyV5WnyrUhN8N4NtTDYHNjKmrjRnYxP4j36mzByR45GbRa3Dhe8yEEMs4kB3TNVp8NCfTJHNPoyStrckNiSBYBpHLEjnnyeH7QTDAKcNczVxEY229rM2jbW6ayx2teBuZys2ugRTbT2ExBJoNjKHacHYZJwvjXNbQtdSb4oPKDHhjJVKGoDxWR1jbybkTfmMg6MgY

Public Key

FW9rRVZ6RiCk64CB7tiCVXGd7i2DYEM3TZo9urWxChSb: BivKmSpFm76DtjnE9vbnEg5aRaSTBEZVP5akxk9pfSpYeWAeZsYvAfrw2MUEtiy9e32h3bcsEiqn2X2dRADTbb5gvM8rdxtgVNGrbEc91cmmYnZSr6K7jY9V8As8u516U4tLgjvAQ6zwW45Xr1CWKVV3L7xpcWAm14xmHPEtHSqXLCdxTjexXY2xCnw2sgxaJpg94X2a8yjoCsrZFpHuekef82ukBPLDkPygtLeZWHBosKUuyqLkt1LnfYQMrLjZm6X6HhMbJN3AdSBeTgVNuN5KAz5aucix7QSAqMXG3YrGjLg3SgpC44o971YH2dVVWcYoyZv17YNFpGJAiEHZyA7EY5zmHaTgQ5TPYYUzpSYC8cbJwKvKkxzCBDmUofkJmT6p8XvonVKeJovEZdfNsXhspYc8k1r3YGexC