Event Sourcing Laravel Package

Product Decisions This Supports

• Event-Driven Architecture (EDA) Adoption: Enables teams to transition from CRUD-based systems to event-sourced models, improving auditability, scalability, and real-time capabilities.
• Domain-Driven Design (DDD) Alignment: Supports rich domain modeling by encapsulating business logic within aggregates and events, reducing anemic domain models.
• Auditability & Compliance: Facilitates immutable event logs for regulatory requirements (e.g., finance, healthcare) without retrofitting.
• Microservices Roadmap: Provides a foundation for decomposing monoliths into event-driven microservices with bounded contexts.
• Build vs. Buy: Avoids reinventing event-sourcing infrastructure (e.g., custom event stores, snapshot management) while maintaining flexibility.
• Use Cases:
  • Financial transaction systems (e.g., ledgers, order processing).
  • Supply chain tracking (e.g., inventory, logistics).
  • User activity streams (e.g., SaaS feature adoption, personalization).

When to Consider This Package

• Adopt if:

  • Your system requires temporal queries (e.g., "Show me all state changes for this entity over time").
  • You need high consistency with eventual consistency trade-offs (e.g., financial systems).
  • Your team is already familiar with DDD or CQRS patterns.
  • You’re building a greenfield project or refactoring a monolith with clear bounded contexts.
  • You prioritize developer productivity over minimal dependencies (PHP ecosystem support).

• Look elsewhere if:

  • You need real-time event processing (consider Kafka, Pulsar, or native PHP event libraries like ReactPHP).
  • Your use case is simple CRUD (overkill for basic persistence).
  • You require scalable event streaming (e.g., 100K+ events/sec; consider specialized databases like EventStoreDB).
  • Your team lacks PHP event-sourcing expertise (steep learning curve for aggregates, projections, and snapshotting).
  • You’re constrained by license compatibility (BSD-3 is permissive but verify downstream dependencies).

How to Pitch It (Stakeholders)

For Executives: "This package lets us build systems where every change is recorded as an immutable event—like a blockchain for our business logic. It’s a game-changer for audit trails, real-time updates, and scaling microservices. For example, in [Industry X], companies using event sourcing reduced compliance costs by 40% and enabled features like ‘undo’ transactions in seconds. We’d own the core tech (no vendor lock-in) while focusing on business value."

For Engineering: *"prooph/event-sourcing gives us a battle-tested PHP implementation of event-sourced aggregates with:

• No boilerplate: Handles versioning, snapshots, and event replay out of the box.
• PHP-native: Integrates seamlessly with Laravel (via repositories) and other PHP frameworks.
• Extensible: Plug into any event store (doctrine DBAL, Elasticsearch, etc.) or add custom middleware.
• Dev-friendly: Clear separation of concerns (aggregates, events, commands) aligns with DDD. Trade-off: We’ll need to upskill on CQRS and projection management, but the long-term flexibility pays off for complex domains like [Specific Feature]."*

For Architects: *"This fills a gap in the PHP ecosystem by providing a mature, dependency-injection-friendly event-sourcing layer. Key advantages:

• Decoupling: Aggregates emit events decoupled from infrastructure (easy to swap stores later).
• Resilience: Built-in event replay and snapshot restoration handle failures gracefully.
• Laravel-ready: Works with Eloquent or custom repositories; minimal setup for existing apps. Recommendation: Pilot with a non-critical module (e.g., user profiles) to validate the pattern before full adoption."*