ChamberOrchestra Metadata Bundle

A Symfony bundle for extending Doctrine ORM entities with custom attribute-driven metadata. Define PHP attributes on your entities and let autoconfigured mapping drivers turn them into cacheable, serializable metadata — with full support for embedded classes and multiple entity managers.

Features

• PHP attribute-based mapping — define custom metadata using native PHP 8 attributes on entity classes and properties
• Cacheable metadata — multi-level cache (PSR-6 + in-memory) with serialization support for production performance
• Embedded entity support — automatic recursive metadata resolution for Doctrine embeddables with lazy field initialization
• Autoconfigured mapping drivers — implement MappingDriverInterface and drivers are auto-tagged via Symfony DI
• Doctrine event integration — hooks into loadClassMetadata to load extension metadata alongside Doctrine's own metadata
• Multiple EntityManager support — cache isolation per EntityManager via spl_object_id scoping
• Zero configuration — install the bundle and start writing drivers; no YAML/XML configuration required

Installation

composer require chamber-orchestra/metadata-bundle

Quick Start

1. Define a Mapping Driver

Create a mapping driver by extending AbstractMappingDriver. Override getClassAttribute() or getPropertyAttribute() to declare which PHP attributes your extension requires:

use ChamberOrchestra\MetadataBundle\Mapping\Driver\AbstractMappingDriver;
use ChamberOrchestra\MetadataBundle\Mapping\ExtensionMetadataInterface;

class TimestampableDriver extends AbstractMappingDriver
{
    protected function getClassAttribute(): string|null
    {
        return Timestampable::class;
    }

    public function loadMetadataForClass(ExtensionMetadataInterface $extensionMetadata): void
    {
        // Read attributes and populate your metadata configuration
    }
}

Drivers implementing MappingDriverInterface are automatically tagged and registered by the bundle.

2. Create a Metadata Factory

Extend AbstractExtensionMetadataFactory to define how your extension metadata is created and loaded:

use ChamberOrchestra\MetadataBundle\Mapping\AbstractExtensionMetadataFactory;
use ChamberOrchestra\MetadataBundle\Mapping\ExtensionMetadataInterface;
use Doctrine\Persistence\Mapping\ClassMetadata;

class TimestampableMetadataFactory extends AbstractExtensionMetadataFactory
{
    protected function newClassMetadataInstance(ClassMetadata $metadata): ExtensionMetadataInterface
    {
        return new ExtensionMetadata($metadata);
    }

    protected function doLoadMetadata(ExtensionMetadataInterface $class): void
    {
        // Delegate to your mapping drivers
    }
}

3. React to Doctrine Events

Use AbstractDoctrineListener to access extension metadata during Doctrine lifecycle events:

use ChamberOrchestra\MetadataBundle\EventSubscriber\AbstractDoctrineListener;
use Doctrine\Bundle\DoctrineBundle\Attribute\AsDoctrineListener;
use Doctrine\ORM\Event\PrePersistEventArgs;
use Doctrine\ORM\Events;

#[AsDoctrineListener(event: Events::prePersist)]
class TimestampableListener extends AbstractDoctrineListener
{
    public function prePersist(PrePersistEventArgs $args): void
    {
        foreach ($this->getScheduledEntityInsertions($args->getEntityManager(), TimestampableConfiguration::class) as $metadataArgs) {
            $metadataArgs->extensionMetadata->setFieldValue(
                $metadataArgs->entity,
                'createdAt',
                new \DateTimeImmutable()
            );
        }
    }
}

Architecture

MetadataSubscriber (Doctrine loadClassMetadata event)
  └── MetadataReader
        └── AbstractExtensionMetadataFactory
              ├── MappingDriverInterface[] (attribute-based mapping drivers)
              ├── ExtensionMetadataInterface (per-entity extension metadata)
              │     ├── MetadataConfigurationInterface[] (per-driver configurations)
              │     └── Embedded metadata (recursive for embeddables)
              └── PSR-6 Cache (serialized metadata storage)

Key Abstractions

Class / Interface	Role
MappingDriverInterface	Extension point — implement to define attribute-driven metadata
AbstractMappingDriver	Base driver with AttributeReader and supports() logic
MetadataConfigurationInterface	Stores field mappings; serializable for Doctrine cache
AbstractDoctrineListener	Base for Doctrine listeners that need extension metadata
MetadataArgs	DTO bundling EntityManager, metadata, configuration, and entity

Requirements

• PHP 8.5+
• Symfony 8.0
• Doctrine ORM 3.6+
• Doctrine Bundle 3.2+

Development

composer install   # Install dependencies
composer test      # Run the test suite

License

MIT