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  • About
  • Installation
  • How to use
    • CQRS PHP
    • Event Handling PHP
    • Aggregates & Sagas
    • Scheduling in PHP
    • Asynchronous PHP
    • Event Sourcing PHP
    • Microservices PHP
    • Resiliency and Error Handling
    • Laravel Demos
    • Symfony Demos
      • Doctrine ORM
  • Tutorial
    • Before we start tutorial
    • Lesson 1: Messaging Concepts
    • Lesson 2: Tactical DDD
    • Lesson 3: Converters
    • Lesson 4: Metadata and Method Invocation
    • Lesson 5: Interceptors
    • Lesson 6: Asynchronous Handling
  • Enterprise
  • Modelling
    • Introduction
    • Message Bus and CQRS
      • CQRS Introduction - Commands
        • Query Handling
        • Event Handling
      • Aggregate Introduction
        • Aggregate Command Handlers
        • Aggregate Query Handlers
        • Aggregate Event Handlers
        • Advanced Aggregate creation
      • Repositories Introduction
      • Business Interface
        • Introduction
        • Business Repository
        • Database Business Interface
          • Converting Parameters
          • Converting Results
      • Saga Introduction
      • Identifier Mapping
    • Extending Messaging (Middlewares)
      • Message Headers
      • Interceptors (Middlewares)
        • Additional Scenarios
      • Intercepting Asynchronous Endpoints
      • Extending Message Buses (Gateways)
    • Event Sourcing
      • Installation
      • Event Sourcing Introduction
        • Working with Event Streams
        • Event Sourcing Aggregates
          • Working with Aggregates
          • Applying Events
          • Different ways to Record Events
        • Working with Metadata
        • Event versioning
        • Event Stream Persistence
          • Event Sourcing Repository
          • Making Stream immune to changes
          • Snapshoting
          • Persistence Strategies
          • Event Serialization and PII Data (GDPR)
      • Projection Introduction
        • Configuration
        • Choosing Event Streams for Projection
        • Executing and Managing
          • Running Projections
          • Projection CLI Actions
          • Access Event Store
        • Projections with State
        • Emitting events
    • Recovering, Tracing and Monitoring
      • Resiliency
        • Retries
        • Error Channel and Dead Letter
          • Dbal Dead Letter
        • Idempotent Consumer (Deduplication)
        • Resilient Sending
        • Outbox Pattern
        • Concurrency Handling
      • Message Handling Isolation
      • Ecotone Pulse (Service Dashboard)
    • Asynchronous Handling and Scheduling
      • Asynchronous Message Handlers
      • Asynchronous Message Bus (Gateways)
      • Delaying Messages
      • Time to Live
      • Message Priority
      • Scheduling
      • Dynamic Message Channels
    • Distributed Bus and Microservices
      • Distributed Bus
        • Distributed Bus with Service Map
          • Configuration
          • Custom Features
          • Non-Ecotone Application integration
          • Testing
        • AMQP Distributed Bus (RabbitMQ)
          • Configuration
        • Distributed Bus Interface
      • Message Consumer
      • Message Publisher
    • Business Workflows
      • The Basics - Stateless Workflows
      • Stateful Workflows - Saga
      • Handling Failures
    • Testing Support
      • Testing Messaging
      • Testing Aggregates and Sagas with Message Flows
      • Testing Event Sourcing Applications
      • Testing Asynchronous Messaging
  • Messaging and Ecotone In Depth
    • Overview
    • Multi-Tenancy Support
      • Getting Started
        • Any Framework Configuration
        • Symfony and Doctrine ORM
        • Laravel
      • Different Scenarios
        • Hooking into Tenant Switch
        • Shared and Multi Database Tenants
        • Accessing Current Tenant in Message Handler
        • Events and Tenant Propagation
        • Multi-Tenant aware Dead Letter
      • Advanced Queuing Strategies
    • Document Store
    • Console Commands
    • Messaging concepts
      • Message
      • Message Channel
      • Message Endpoints/Handlers
        • Internal Message Handler
        • Message Router
        • Splitter
      • Consumer
      • Messaging Gateway
      • Inbound/Outbound Channel Adapter
    • Method Invocation And Conversion
      • Method Invocation
      • Conversion
        • Payload Conversion
        • Headers Conversion
    • Service (Application) Configuration
    • Contributing to Ecotone
      • How Ecotone works under the hood
      • Ecotone Phases
      • Registering new Module Package
      • Demo Integration with SQS
        • Preparation
        • Inbound and Outbound Adapters and Message Channel
        • Message Consumer and Publisher
  • Modules
    • Overview
    • Symfony
      • Symfony Configuration
      • Symfony Database Connection (DBAL Module)
      • Doctrine ORM
      • Symfony Messenger Transport
    • Laravel
      • Laravel Configuration
      • Database Connection (DBAL Module)
      • Eloquent
      • Laravel Queues
      • Laravel Octane
    • Ecotone Lite
      • Logging
      • Database Connection (DBAL Module)
    • JMS Converter
    • OpenTelemetry (Tracing and Metrics)
      • Configuration
    • RabbitMQ Support
    • Kafka Support
      • Configuration
      • Message partitioning
      • Usage
    • DBAL Support
    • Amazon SQS Support
    • Redis Support
  • Other
    • Contact, Workshops and Support
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  1. Modelling
  2. Event Sourcing
  3. Event Sourcing Introduction

Event versioning

In its lifetime events may change. In order to track those changes Ecotone provides possibility of versioning events.

use Ecotone\Modelling\Attribute\Revision;

#[Revision(2)]
class MyEvent
{
    public string $id;
}

Value given with Revision attribute will be stored by Ecotone in events metadata. Attribute is used only when event is saved in event store. In order to read it, you can access events metadata, e.g. in event handler.

use Ecotone\Messaging\MessageHeaders;

class MyEventHandler
{
    #[EventHandler]
    public function handle(MyEvent $event, array $metadata) : void
    {
        if ($metadata[MessageHeaders::REVISION] !== 2) {
            return; // this is not the revision I'm looking for
        }
        
        // the force is strong with this one
    }
}

Revision applies to messages in general (also commands and queries). However, for now it is used only when events gets saved.

You don't have to define Revision for your current events. Ecotone will set it's value to 1 by default. Also, if not defined in the class, already saved events will be read with Revision 1.

[Enterprise] Accessing Metadata in Event Sourcing Handler

This feature is available as part of Ecotone Enterprise.

Depending on the version we may actually want to restore our Aggregate a bit differently. This is especially useful when we've changed the way Events are structured and introduced new version of the Event. For this we can use revision header to access the version on which given Event was stored.

#[EventSourcingAggregate]
class Product
{
    #[Identifier]
    private string $id;
    private string $type;

    (...)

        
    #[EventSourcingHandler]
    public function applyProductWasCreated(
        ProductWasCreated $event,
        // Accessing Metadata
        #[Header("revision")] int $revision,
    ) : void
    {
        $this->id = $event->id;
        if ($revision < 4) {
            $this->type = 'standard';
        }

        $this->type = $event->type;
    }
}

We may inject any type of Header that was stored together with the Event. This means inbuilt not only headers like timestamp, id, correlationId are avaiable out of the box, but also custom headers provided by the application (e.g. userId).

PreviousWorking with MetadataNextEvent Stream Persistence

Last updated 3 months ago

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