Cache with TTL

Cache with TTL

Build a generic, thread-safe cache with time-to-live (TTL) expiration and automatic cleanup.

Background

TTL (Time-To-Live) Cache: Items expire after a set duration. Essential for:

• Temporary data storage
• Rate limiting implementations
• Session management
• API response caching

Key features:

• Generic Types: Works with any key/value types
• Automatic Expiration: Items expire after TTL
• Background Cleanup: Goroutine periodically removes expired items
• Thread Safety: RWMutex for concurrent access

Your Task

Implement a generic TTL cache with:

1. Set(key, value) - Store item with expiration time
2. Get(key) - Retrieve item (only if not expired)
3. Delete(key) - Manually remove item
4. Background cleanup goroutine
5. Thread-safe operations

Generic TTL Cache

~45 minhard

Build a cache with time-based expiration and automatic cleanup

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Key Concepts

• Generic Data Structures: Cache[K comparable, V any] works with any key/value types
• TTL Expiration: Items automatically expire after time-to-live duration
• Background Cleanup: Goroutine with ticker periodically removes expired items
• Thread Safety: RWMutex allows multiple readers or one writer
• Time Management: Use time.Now() and time.After() for expiration checks

Extensions

• Add per-item custom TTL (override default)
• Implement cache statistics (hits, misses, evictions)
• Add maximum cache size with LRU eviction
• Implement lazy deletion (only clean on access)
• Add persistence (save/load from disk)