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DomainFlow EventSourcing Core

A persistence-agnostic PHP event sourcing library: aggregates, events, snapshots, optimistic concurrency, event upcasting, projections, and process managers. It defines the storage seams a concrete database technology implements — it never depends on a concrete database or framework itself.

Requirements

• PHP 8.4+
• Sodium PHP extension ext-sodium
• DomainFlow Uuid Package domainflow/uuid

Installation

Core concepts

• Aggregate root — AggregateRoot, a domain object whose state is derived by replaying its own event history. Extend it, implement apply<EventShortName>() handler methods and the newInstance(): static factory method.
• Domain event — DomainEventInterface, or extend the SourceEvent base class for the common boilerplate (aggregate ID, event ID, version, occurred-on timestamp).
• Aggregate repository / facade — AggregateRepository is the load/save orchestrator; EventSourcingFacade is the intended single public entry point most consumers use, wrapping the repository plus optional concurrency checking, snapshotting, and event dispatch.
• Crypto-shredding — #[PersonalData] on a field, #[DataSubjectId] on the one that says whose it is, and erasure is destroying that subject's key: the event stays exactly as written and stops being readable. It is a decorator around the entry factory, so no storage adapter is involved. After erasure the field reads RedactedValue::MARKER rather than null, so a projector can tell "erased" from "never set".
• Operational commands — Operation\DrainOutbox, Operation\RebuildProjection and Operation\EnsureSchema: the three things that have to be run in production, as plain invokables that return a result and log nothing. No console dependency here, so bind them to whatever CLI you have. DrainOutbox is the relay loop with the parts that are easy to get wrong — back-off on an idle pass and none on a busy one, maxPasses/maxSeconds so the same object serves cron and a daemon, and a stop() flag read between passes so a SIGTERM never drops the entries the current pass claimed.
• Storage interfaces — EventStorageInterface, SnapshotStorageInterface, SnapshotHistoryStorageInterface, ProcessManagerStorageInterface. Implement these against a concrete database to build a new storage adapter.
• Process manager — AbstractProcessManager for event-driven sagas: implements ProcessManagerInterface and EventSubscriberInterface, so a single instance can register directly with EventDispatcher. Saga timeouts fire from ProcessManagerTimeoutRunner, which you schedule the same way you schedule OutboxRelay — a timeout exists for the case where no event is arriving, so nothing else is going to look at the process again.

Usage

Building your own storage adapter

provider/Unit/ and provider/Integration/ ship as production code (not dev-only) specifically so an adapter package can composer require this package and reuse these abstract PHPUnit test cases to prove its concrete storage classes satisfy the same contract this library's own InMemory* reference adapters do.

Development

License

MIT — see LICENSE.