Strategy Injector Laravel Package

Product Decisions This Supports

• Modular Architecture: Enables clean separation of concerns by allowing dynamic strategy injection, reducing tight coupling between components. Ideal for systems requiring extensibility (e.g., payment processors, validation rules, or report generators).
• Roadmap for Plugin/System Extensibility: Accelerates development of plugin architectures (e.g., e-commerce plugins, CRM integrations) by standardizing how strategies are composed and swapped at runtime.
• Build vs. Buy: Justifies building a custom strategy layer over buying monolithic solutions (e.g., custom workflow engines) when domain-specific strategies are needed.
• Use Cases:
  • Dynamic Business Logic: Swap algorithms (e.g., pricing, discount rules) without code changes.
  • A/B Testing: Route requests to different strategy implementations based on user segments.
  • Legacy System Integration: Wrap legacy code behind interfaces to enable gradual modernization.

When to Consider This Package

• Adopt if:

  • Your Symfony/PHP app requires runtime strategy composition (e.g., plugins, feature flags).
  • You’re building a composable architecture (e.g., microservices with interchangeable modules).
  • You need to avoid static dependencies between services (e.g., payment gateways, data processors).
  • Your team prioritizes YAML-driven configuration over runtime DI containers (e.g., Symfony’s autowiring).

• Look elsewhere if:

  • You’re using non-Symfony PHP (package is Symfony-specific).
  • Your strategies are static (no need for runtime injection).
  • You prefer code-based composition (e.g., manual service registration) over YAML.
  • The package’s archived status concerns you (evaluate maintenance risk).
  • You need advanced strategy validation (e.g., dependency checks, lifecycle hooks)—consider alternatives like PHP-DI or custom solutions.

How to Pitch It (Stakeholders)

For Executives: "This package lets us dynamically swap out business logic—like payment methods or validation rules—without redeploying code. Imagine A/B testing discount engines or adding third-party integrations as plugins. It’s like Lego blocks for our backend: we configure strategies in YAML, and the system assembles them at runtime. This cuts dev time for new features and makes our architecture more resilient to change."

For Engineering: *"StrategyInjectorBundle is a lightweight Symfony helper to automate the Strategy Pattern. Instead of manually wiring strategies into a composite class, we define mappings in strategy_injector.yaml (e.g., App\PaymentInterface: App\CompositePaymentHandler). It supports both constructor injection and method-based composition. Perfect for:

• Plugins: Dynamically load strategies for e-commerce, CRM, etc.
• Feature Flags: Route traffic to different implementations (e.g., V1 vs. V2 algorithms).
• Legacy Wrappers: Isolate old code behind interfaces.

Tradeoff: It’s archived, so we’d need to vet its long-term viability. But for Symfony apps needing composable logic, it’s a 10-minute setup with big payoffs."*

For Developers: *"This bundle lets you define strategy compositions in YAML instead of code. Example:

App\Strategy\DiscountInterface: App\CompositeDiscountStrategy  # Auto-injects all DiscountInterface impls

Or for method-based injection:

App\Strategy\DiscountInterface:
  method: 'addDiscount'
  class: App\CompositeDiscountStrategy

Pros:

• No manual DI container tweaks.
• Clean separation of concerns. Cons:
• Limited to Symfony.
• Archived (check for forks or maintenance). Best for apps where strategies are configured centrally, not hardcoded."*