Stash Bundle Laravel Package

Technical Evaluation

Architecture Fit

• Symfony Integration: The TedivmStashBundle is a Symfony-specific wrapper for the Stash caching library, making it a natural fit for Symfony-based applications (v3.4+ and Symfony 5+).
• Multi-Driver Support: Supports composite caching (e.g., Apc + FileSystem fallback), enabling high availability and performance optimization by leveraging multiple backends (e.g., Redis, Memcached, APC, SQLite, or filesystem).
• Doctrine & Session Integration: Provides Doctrine Cache Adapter and Session Handler support, reducing dependency sprawl by consolidating caching needs.
• PSR-6 Compliance: Underlying Stash library is PSR-6 compliant, ensuring compatibility with modern PHP caching standards.

Integration Feasibility

• Low Friction: Requires minimal configuration (e.g., drivers: [Apc, FileSystem]), with sensible defaults.
• Symfony Flex Compatibility: While not explicitly Flex-optimized, it integrates seamlessly with Symfony’s dependency injection and configuration system.
• Backward Compatibility: Supports Symfony 3.4–5.x, with explicit PHP 7.0+ and HHVM support.
• Key Collision Avoidance: Supports multiple named cache services (e.g., first, second), preventing key conflicts in shared environments.

Technical Risk

Key Questions for TPM

1. Performance Requirements:

   • Are low-latency (e.g., Redis) or high-durability (e.g., SQLite) backends prioritized?
   • Will fallback chains (e.g., Redis → FileSystem) be needed for high availability?

2. Operational Constraints:

   • Are shared hosting environments (e.g., no APC/OPcache) expected? If so, FileSystem or Memcached may be mandatory.
   • Will multi-region deployments require distributed caching (e.g., Redis Cluster)?

3. Compatibility:

   • Does the app use Doctrine ORM? If yes, the DoctrineAdapter simplifies cache configuration.
   • Are legacy Symfony 3.4 components in use? Test thoroughly—some features (e.g., registerDoctrineAdapter) may need manual setup.

4. Maintenance:

   • Who will monitor cache hit/miss ratios (via tracking) and adjust TTLs/drivers?
   • Is there a rollout strategy for enabling caching incrementally (e.g., start with non-critical endpoints)?

5. Alternatives:

   • Why not Symfony Cache (e.g., symfony/cache) or Doctrine Cache?
     • Stash offers more driver options (e.g., Memcached, APC) and composite fallbacks out of the box.

Integration Approach

Stack Fit

Migration Path

1. Assessment Phase:

   • Audit current caching (e.g., Symfony Cache, Doctrine Cache, or custom solutions).
   • Identify critical cache dependencies (e.g., Doctrine, sessions).

2. Pilot Integration:

   • Start with non-critical endpoints (e.g., API responses, non-DB queries).
   • Configure a single driver (e.g., FileSystem) for validation.
   • Example config.yml:

     stash:
         drivers: [FileSystem]
         FileSystem:
             path: "%kernel.cache_dir%/stash"
     

3. Gradual Rollout:

   • Add composite drivers (e.g., Redis → FileSystem) for high availability.
   • Enable Doctrine Adapter for ORM caching:

     stash:
         drivers: [Redis]
         registerDoctrineAdapter: true
         Redis:
             servers:
                 - { server: "redis://localhost", port: 6379 }
     doctrine:
         orm:
             metadata_cache_driver: stash.adapter.doctrine.default_cache
     

   • Replace legacy caches (e.g., ApcUserCache) with Stash equivalents.

4. Optimization:

   • Use Web Profiler (stash.tracking: true) to analyze hit/miss ratios.
   • Adjust TTLs and driver order based on metrics.

Compatibility

Sequencing

1. Phase 1: Basic Caching

   • Replace simple caches (e.g., file_get_contents + manual serialization) with Stash.
   • Example:

     $pool = $this->get('stash');
     $item = $pool->getItem('user_123_data');
     if (!$item->isHit()) {
         $item->set($this->loadUserData(123), 3600); // 1-hour TTL
     }
     

2. Phase 2: Doctrine Integration

   • Migrate metadata_cache, query_cache, and result_cache to Stash.
   • Example:

     doctrine:
         orm:
             query_cache_driver: stash.adapter.doctrine.default_cache
     

3. Phase 3: Advanced Drivers

   • Add Redis/Memcached for distributed caching.
   • Configure fallback chains (e.g., Redis → FileSystem).

4. Phase 4: Monitoring & Tuning

   • Enable stash.tracking: true in dev env.
   • Adjust TTLs and drivers based on hit/miss data.

Operational Impact

Maintenance