Doctrine Cache Extension Laravel Package

Getting Started

• Install with composer require openclassrooms/doctrine-cache-extension. Check the composer.json in the repo for the supported PHP and doctrine/cache version ranges before committing — this is a small package, so version alignment matters more than with a widely-used one.
• Look at the tests first, not just the README. For a low-star extension like this, tests/ is usually the most accurate spec of intended behavior (constructor signatures, method contracts, edge cases). Skim the source tree to see what is actually added on top of Doctrine\Common\Cache.
• Confirm what "extending capabilities" means for your version: typically it is a decorator/provider layer over a standard Doctrine CacheProvider (prefixing/namespacing, collection-style caching, or a wrapper around existing providers). Identify the concrete class you will interact with and whether it implements Doctrine\Common\Cache\Cache / CacheProvider.
• First use case: wrap an existing provider you already use (ArrayCache in dev, RedisCache/ApcuCache/FilesystemCache in prod) with the extension, then run one real read-through: save a key, fetch it, delete it, and confirm the wrapper preserves fetch/save/delete/contains semantics.
• Verify autoloading and that your DI container or bootstrap can inject the wrapped provider without type errors against your doctrine/cache version.

Implementation Patterns

• Decorator around a provider. The canonical usage is composition, not inheritance: instantiate the extension with your real backend provider as a dependency, then register the extension as the Doctrine\Common\Cache\Cache service in your container. This keeps the extension swappable and lets you keep using the underlying provider directly for debugging.
• Service wiring (Symfony/Laravel): define the backend provider as a separate service, then define the extension service taking that provider as an argument, and alias the cache interface to the extension. Never hard-code the provider inside business code.
• Namespacing / key-prefixing workflows. If the package adds prefixing, use it to isolate logical domains (e.g. user:, catalog:) so a single backend can serve multiple features and deleteAll/flush stays scoped. Keep a single helper that builds keys ("{$domain}:{$id}") rather than string-concatenating at call sites.
• Collection lifecycle caching. For list/detail patterns, cache the collection under one key and individual items under another, and invalidate the affected keys together on write. Centralize invalidation in the repository/service layer — never scatter delete() calls through controllers.
• TTL discipline. Pass TTLs explicitly at save sites even if the backend defaults exist; it makes expiry intent auditable and survives provider swaps.
• Testing pattern. Swap in ArrayCache (or the extension wrapping ArrayCache) in tests so suites stay hermetic; assert both the cached and invalidated paths.
• Integration tip: keep a thin repository/service wrapper exposing domain methods (getUser, rememberUser) that delegate to the extension, so the rest of the app never touches cache keys directly.

Gotchas and Tips

• Doctrine Cache itself is legacy/deprecated in favor of PSR-6/PSR-16 (Symfony Cache contracts). Treat this package as a bridge for existing Doctrine-cache code, and isolate it behind a wrapper so a later migration to symfony/cache is a one-file change.
• Small, low-dependent package (0 dependents): expect sparse docs and no active maintenance. Pin the version in composer.json, and vendor/fork if you rely on it long-term.
• API drift between versions: the extension's added methods may not exist on the base interface. Type-hint against your app's own wrapper interface, not the concrete extension class, to avoid coupling.
• Serialization pitfalls: if the extension serializes values, closures/resources/entities with lazy proxies will break. Cache scalars, arrays, or DTOs — not Doctrine entities with associations.
• Key collisions: prefixing is not a substitute for deliberate key design; two features sharing a backend can still clash. Log or debug-inspect actual keys during development.
• Debugging: wrap with a no-op or ArrayCache to rule out cache logic before blaming the backend; check provider-level errors (Redis timeouts, APCu disabled in CLI) which surface as silent cache misses rather than exceptions.
• Extension points: prefer implementing your own CacheProvider decorator or extending the extension's wrapper class if you need custom behavior — the decorator boundary is the clean seam for adding logging, metrics, or key transforms.
• CLI vs FPM: APCu and opcache behave differently in CLI; tests passing locally can still miss in production. Verify against your real backend in staging.