From ORM to ODM & viceversa

Transcript

1. Ettore Delprino (@edelprino)
   From ORM to ODM
   & viceversa
   

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2. Ettore Delprino (@edelprino)
   Ettore Delprino
   @edelprino
   http://edelprino.com
   

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3. Ettore Delprino (@edelprino)
   

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4. Ettore Delprino (@edelprino)
   

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5. Ettore Delprino (@edelprino)
   “In theory, theory and
   practice are the same. In
   practice, they are not!!!”
   Albert Einstein
   

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6. Ettore Delprino (@edelprino)
   Active Record
   An object that wraps a row in a database
   table or view, encapsulates the database
   access, and adds domain logic on that data.
   

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7. Ettore Delprino (@edelprino)
   Entity & Document
   Entities (Documents) are objects with
   identity. Their identity has a conceptual
   meaning inside your domain.
   

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8. Ettore Delprino (@edelprino)
   Data Mapper
   The Data Mapper is a layer of software
   that separates the in-memory objects from
   the database. Its responsibility is to transfer
   data between the two and also to isolate
   them from each other
   

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9. Ettore Delprino (@edelprino)
   Repository Pattern
   A Repository mediates between the
   domain and data mapping layers, acting like
   an in-memory domain object collection.
   Objects can be added to and removed
   from the Repository.
   

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10. Ettore Delprino (@edelprino)
    

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11. Ettore Delprino (@edelprino)
    “è un mappazzone!!!”
    Bruno Barbieri
    

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12. Ettore Delprino (@edelprino)
    Solutions?
    Repository Pattern, Service Container &
    Mapping File
    

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13. Ettore Delprino (@edelprino)
    Product Class
    class Product
    {
    protected $id;
    protected $name;
    protected $price;
    protected $description
    public function getId()
    {
    return $this->id;
    }
    ...
    

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14. Ettore Delprino (@edelprino)
    Product Mapping File
    ...Bundle\Model\Product\Product:
    type: entity
    table: products
    id:
    id:
    type: integer
    generator:
    strategy: AUTO
    fields:
    name:
    type: string
    price:
    type: float
    description:
    type: string
    

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15. Ettore Delprino (@edelprino)
    Repository Interface
    interface ProductRepositoryInterface
    {
    public function create();
    public function save(Product $product);
    public function update(Product $product);
    public function delete(Product $product);
    public function find($id);
    }
    

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16. Ettore Delprino (@edelprino)
    ORM Repository
    class ORMProductRepository implements ProductRepositoryInterface
    {
    protected $doctrineORMRepository;
    protected $entityManager;
    public function __construct($doctrineORMRepository, $entityManager)
    {
    $this->doctrineORMRepository = $doctrineORMRepository;
    $this->entityManager = $entityManager;
    }
    public function save(Product $product)
    {
    $this->entityManager->persist($product);
    $this->entityManager->flush($product);
    return $this;
    }
    ...
    

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17. Ettore Delprino (@edelprino)
    Service Container
    product.doctrine_orm_repository:
    ...
    product.repository.orm:
    class: ...Bundle\Model\Product\ORMProductRepository
    arguments: [@product.doctrine_orm_repository, @entity_manager]
    product.repository:
    alias: product.repository.orm
    

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18. Ettore Delprino (@edelprino)
    

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19. Ettore Delprino (@edelprino)
    Before:
    After:
    

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20. Ettore Delprino (@edelprino)
    What If I want to change?
    Repository Pattern, Service Container &
    Mapping File
    

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21. Ettore Delprino (@edelprino)
    Product Mapping File
    ...Bundle\Model\Product\Product:
    type: document
    collection: products
    fields:
    id:
    unique: true
    id: true
    strategy: increment
    name:
    type: string
    price:
    type: float
    description:
    type: string
    

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22. Ettore Delprino (@edelprino)
    ODM Repository
    class ODMProductRepository implements ProductRepositoryInterface
    {
    protected $doctrineODMRepository;
    protected $documentManager;
    public function __construct($doctrineODMRepository, $documentManager)
    {
    $this->doctrineODMRepository = $doctrineODMRepository;
    $this->documentManager = $documentManager;
    }
    public function save(Product $product)
    {
    $this->documentManager->persist($product);
    $this->documentManager->flush($product);
    return $this;
    }
    ...
    

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23. Ettore Delprino (@edelprino)
    Service Container
    product.doctrine_odm_repository:
    ...
    product.repository.orm:
    class: ...Bundle\Model\Product\ORMProductRepository
    arguments: [@product.doctrine_orm_repository, @entity_manager]
    product.repository.odm:
    class: ...Bundle\Model\Product\ODMProductRepository
    arguments: [@product.doctrine_odm_repository, @document_manager]
    product.repository:
    alias: product.repository.odm
    

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24. Ettore Delprino (@edelprino)
    

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25. Ettore Delprino (@edelprino)
    “Database is a plugin!!!”
    Robert C. Martin
    

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26. Ettore Delprino (@edelprino)
    Is it essential?
    InMemoryProductRepository
    

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27. Ettore Delprino (@edelprino)
    InMemory Repository
    class InMemoryProductRepository implements ProductRepositoryInterface
    {
    protected $products;
    public function __construct()
    {
    $this->products = [
    $this->getNewProduct(‘Prodotto0’, 10),
    $this->getNewProduct(‘Prodotto1’, 20)
    ];
    }
    public function save(Product $product)
    {
    $this->setId($product);
    $this->products[] = $product;
    }
    ...
    

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28. Ettore Delprino (@edelprino)
    Service Container
    ...
    product.repository.orm:
    class: ...Bundle\Model\Product\ORMProductRepository
    arguments: [@product.doctrine_orm_repository, @entity_manager]
    product.repository.odm:
    class: ...Bundle\Model\Product\ODMProductRepository
    arguments: [@product.doctrine_odm_repository, @document_manager]
    product.repository.in_memory:
    class: ...Bundle\Model\Product\InMemoryProductRepository
    product.repository:
    alias: product.repository.in_memory
    

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29. Ettore Delprino (@edelprino)
    

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30. Ettore Delprino (@edelprino)
    Other ideas...
    APIProductRepository
    RedisProductRepository
    KeyValueProductRepository
    

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31. Ettore Delprino (@edelprino)
    That’s all
    Questions?
    

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32. Ettore Delprino (@edelprino)
    Interesting readings:
    http://williamdurand.fr/2013/08/07/ddd-with-symfony2-folder-structure-and-code-first
    http://blog.8thlight.com/uncle-bob/2012/08/13/the-clean-architecture.html
    http://martinfowler.com/eaaCatalog/repository.html
    http://stackoverflow.com/questions/17228417/symfony-2-creating-a-service-from-a-repository
    

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