cache-persistence

Cache Persistence Example

This example demonstrates how to use ItemsWithExpiration() and LoadItemsWithExpiration() to persist cache data to JSON files and restore it later.

Features Demonstrated

1. Export Cache to JSON: Use ItemsWithExpiration() to get all cache items with their expiration times and serialize to JSON
2. Import from JSON: Load JSON data back into cache using LoadItemsWithExpiration()
3. Flexible Loading: Show different strategies for loading cached data:
   • Load with original expiration times
   • Load with default expiration for all items
   • Load with custom/extended expiration times

What This Example Shows

• Populating cache with various expiration settings
• Exporting cache contents to a JSON file preserving expiration information
• Clearing cache (simulating application restart)
• Restoring cache from JSON with different expiration strategies
• Handling expired items during restoration

Key Methods Used

• cache.ItemsWithExpiration() - Get all items with expiration info
• cache.LoadItemsWithExpiration(items) - Load items with specific expiration times
• cache.LoadItems(items, expiration) - Load items with uniform expiration
• JSON serialization/deserialization for persistence

Usage

cd examples/cache-persistence
go run main.go

The example will create a temporary cache_backup.json file during execution and clean it up automatically.