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依存関係のコントロール / Dependency Control

nrs
September 24, 2022

依存関係のコントロール / Dependency Control

PHP Conference 2022 でソフトウェア開発における依存をどのように制御するかについてお話ししました。

この資料を使ったトークが YouTube にアップロードされています。
トークURL: https://youtu.be/0Y7ew4FHdO4

セッションの概要など詳しくはコチラ→https://fortee.jp/phpcon-2022/proposal/2a07ae7f-0b02-42d5-a5f3-53d397a7dcfc

◆ URL
トークURL: https://youtu.be/0Y7ew4FHdO4
チャンネル登録: https://www.youtube.com/c/narusemi?sub_confirmation=1
Twitter: https://twitter.com/nrslib

nrs

September 24, 2022
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Transcript

  1. View Slide

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  4. 他に頼って存在、または生活すること。
    デジタル大辞泉

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  14. View Slide

  15. $msg = "hello";
    var_dump($msg);

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  16. class Foo {
    public function greet() {
    echo "hello";
    }
    }
    $foo = new Foo();
    $foo->greet();

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  17. class Foo {
    private readonly Bar $bar;
    public function __construct(Bar $bar) {
    $this->bar = $bar;
    }
    public function greet() {
    echo "hello " . $this->bar->getName();
    }
    }
    class Bar {
    private readonly string $name;
    public function __construct(string $name) {
    $this->name = $name;
    }
    public function getName(): string
    {
    return $this->name;
    }
    }
    $bar = new Bar("nrs");
    $foo = new Foo($bar);
    $foo->greet();

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  18. class Foo {
    private readonly Bar $bar;
    public function __construct(Bar $bar) {
    $this->bar = $bar;
    }
    public function greet() {
    echo "hello " . $this->bar->getName();
    }
    }
    class Bar {
    private readonly string $name;
    public function __construct(string $name) {
    $this->name = $name;
    }
    public function getName(): string
    {
    return $this->name;
    }
    }
    $bar = new Bar("nrs");
    $foo = new Foo($bar);
    $foo->greet();

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  19. class Foo {
    private readonly Bar $bar;
    public function __construct(Bar $bar) {
    $this->bar = $bar;
    }
    public function greet() {
    echo "hello " . $this->bar->getName();
    }
    }
    class Bar {
    private readonly string $name;
    public function __construct(string $name) {
    $this->name = $name;
    }
    public function getName(): string
    {
    return $this->name;
    }
    }
    $bar = new Bar("nrs");
    $foo = new Foo($bar);
    $foo->greet();

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  20. class Foo {
    private readonly Bar $bar;
    public function __construct(Bar $bar) {
    $this->bar = $bar;
    }
    public function greet() {
    echo "hello " . $this->bar->getName();
    }
    }
    class Bar {
    private readonly string $name;
    public function __construct(string $name) {
    $this->name = $name;
    }
    public function getName(): string
    {
    return $this->name;
    }
    }
    $bar = new Bar("nrs");
    $foo = new Foo($bar);
    $foo->greet();

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  21. class Foo {
    private readonly Bar $bar;
    public function __construct(Bar $bar) {
    $this->bar = $bar;
    }
    public function greet() {
    echo "hello " . $this->bar->getName();
    }
    }
    class Bar {
    private readonly string $name;
    public function __construct(string $name) {
    $this->name = $name;
    }
    public function getName(): string
    {
    return $this->name;
    }
    }
    $bar = new Bar("nrs");
    $foo = new Foo($bar);
    $foo->greet();

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  22. class Foo {
    private readonly Bar $bar;
    public function __construct(Bar $bar) {
    $this->bar = $bar;
    }
    public function greet() {
    echo "hello " . $this->bar->getName();
    }
    }
    class Bar {
    private readonly string $name;
    public function __construct(string $name) {
    $this->name = $name;
    }
    public function getName(): string
    {
    return $this->name;
    }
    }
    $bar = new Bar("nrs");
    $foo = new Foo($bar);
    $foo->greet();

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  23. class Foo {
    private readonly Bar $bar;
    public function __construct(Bar $bar) {
    $this->bar = $bar;
    }
    public function greet() {
    echo "hello " . $this->bar->getName();
    }
    }
    class Bar {
    private readonly string $name;
    public function __construct(string $name) {
    $this->name = $name;
    }
    public function getName(): string
    {
    return $this->name;
    }
    }

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  24. class Foo {
    private readonly Bar $bar;
    public function __construct(Bar $bar) {
    $this->bar = $bar;
    }
    public function greet() {
    echo "hello " . $this->bar->getName();
    }
    }
    class Bar {
    private readonly string $name;
    public function __construct(string $name) {
    $this->name = $name;
    }
    public function getName(): string
    {
    return $this->name;
    }
    }

    View Slide

  25. class Foo {
    private readonly Bar $bar;
    public function __construct(Bar $bar) {
    $this->bar = $bar;
    }
    public function greet() {
    echo "hello " . $this->bar->getName();
    }
    }
    class Bar {
    private readonly string $name;
    public function __construct(string $name) {
    $this->name = $name;
    }
    public function getName(): string
    {
    return $this->name;
    }
    }

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  26. class Foo {
    private readonly Bar $bar;
    public function __construct(Bar $bar) {
    $this->bar = $bar;
    }
    public function greet() {
    echo "hello " . $this->bar->getName();
    }
    }
    class Bar {
    private readonly string $name;
    public function __construct(string $name) {
    $this->name = $name;
    }
    public function getName(): string
    {
    return $this->name;
    }
    }

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  27. View Slide

  28. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

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  29. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

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  30. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

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  31. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

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  32. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

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  33. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

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  34. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

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  35. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

    View Slide

  36. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

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  37. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

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  38. View Slide

  39. View Slide

  40. View Slide

  41. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

    View Slide

  42. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

    View Slide

  43. View Slide

  44. View Slide

  45. View Slide

  46. View Slide

  47. View Slide

  48. View Slide

  49. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

    View Slide

  50. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

    View Slide

  51. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

    View Slide

  52. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    /**
    * @param UserCreateRequest $request
    * @return UserCreateResponse
    */
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    return new UserCreateResponse($userId->getValue());
    }
    }
    use Illuminate¥Support¥Facades¥DB;

    View Slide

  53. View Slide

  54. View Slide

  55. View Slide

  56. View Slide

  57. View Slide

  58. View Slide

  59. View Slide

  60. View Slide

  61. View Slide

  62. View Slide

  63. View Slide

  64. View Slide

  65. View Slide

  66. View Slide

  67. View Slide

  68. class QueryBuilderUserRepository
    {
    public function save(User $user)
    {
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    }
    }

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  69. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(QueryBuilderUserRepository $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    $this->userRepository->save($user);
    return new UserCreateResponse($userId->getValue());
    }
    }

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  70. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(QueryBuilderUserRepository $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    $this->userRepository->save($user);
    return new UserCreateResponse($userId->getValue());
    }
    }

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  71. View Slide

  72. View Slide

  73. interface UserRepositoryInterface
    {
    public function save(User $user);
    }

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  74. View Slide

  75. View Slide

  76. class QueryBuilderUserRepository
    {
    public function save(User $user)
    {
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    }
    }

    View Slide

  77. class QueryBuilderUserRepository implements UserRepositoryInterface
    {
    public function save(User $user)
    {
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    }
    }

    View Slide

  78. View Slide

  79. View Slide

  80. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(QueryBuilderUserRepository $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    $this->userRepository->save($user);
    return new UserCreateResponse($userId->getValue());
    }
    }

    View Slide

  81. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(QueryBuilderUserRepository $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    $this->userRepository->save($user);
    return new UserCreateResponse($userId->getValue());
    }
    }

    View Slide

  82. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(UserRepositoryInterface $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    $this->userRepository->save($user);
    return new UserCreateResponse($userId->getValue());
    }
    }

    View Slide

  83. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(UserRepositoryInterface $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    $this->userRepository->save($user);
    return new UserCreateResponse($userId->getValue());
    }
    }

    View Slide

  84. View Slide

  85. View Slide

  86. View Slide

  87. View Slide

  88. View Slide

  89. View Slide

  90. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(QueryBuilderUserRepository $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    $this->userRepository->save($user);
    return new UserCreateResponse($userId->getValue());
    }
    }

    View Slide

  91. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(QueryBuilderUserRepository $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    $this->userRepository->save($user);
    return new UserCreateResponse($userId->getValue());
    }
    }

    View Slide

  92. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(QueryBuilderUserRepository $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request): UserCreateResponse
    {
    $userId = new UserId(uniqid());
    $user = new User($userId, $request->getName());
    $this->userRepository->save($user);
    return new UserCreateResponse($userId->getValue());
    }
    }

    View Slide

  93. View Slide

  94. View Slide

  95. View Slide

  96. View Slide

  97. View Slide

  98. class QueryBuilderUserRepository implements UserRepositoryInterface
    {
    public function save(User $user)
    {
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    }
    }

    View Slide

  99. class QueryBuilderUserRepository implements UserRepositoryInterface
    {
    public function save(User $user)
    {
    DB::table('users')
    ->updateOrInsert(
    ['id' => $user->getId()],
    ['name' => $user->getName()]
    );
    }
    }

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  100. View Slide

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  103. View Slide

  104. View Slide

  105. View Slide

  106. $repository = new QueryBuilderUserRepository();
    $interactor = new UserCreateInteractor($repository);
    $interactor->handle(new UserCreateRequest("nrs"));

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  107. $repository = new QueryBuilderUserRepository();
    $interactor = new UserCreateInteractor($repository);
    $interactor->handle(new UserCreateRequest("nrs"));

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  108. $repository = new AwesomeUserRepository();
    $interactor = new UserCreateInteractor($repository);
    $interactor->handle(new UserCreateRequest("nrs"));

    View Slide

  109. $repository = new AwesomeUserRepository();
    $interactor = new UserCreateInteractor($repository);
    $interactor->handle(new UserCreateRequest("nrs"));

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  110. $repository = new AwesomeUserRepository();
    $interactor = new UserCreateInteractor($repository);
    $interactor->handle(new UserCreateRequest("nrs"));

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  111. View Slide

  112. $this->app->bind(
    UserRepositoryInterface::class,
    QueryBuilderUserRepository::class
    );

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  113. View Slide

  114. View Slide

  115. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(UserRepositoryInterface $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request)
    {
    $userId = new UserId(uniqid());
    $createdUser = new User($userId, $request->getName());
    $this->userRepository->save($createdUser);
    return new UserCreateResponse($userId->getValue());
    }
    }

    View Slide

  116. class UserCreateInteractor implements UserCreateUseCaseInterface
    {
    private $userRepository;
    public function __construct(UserRepositoryInterface $userRepository)
    {
    $this->userRepository = $userRepository;
    }
    public function handle(UserCreateRequest $request)
    {
    $userId = new UserId(uniqid());
    $createdUser = new User($userId, $request->getName());
    $this->userRepository->save($createdUser);
    return new UserCreateResponse($userId->getValue());
    }
    }

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  118. class UserController extends BaseController
    {
    public function create(UserCreateUseCaseInterface $interactor, Request $request)
    {
    $name = $request->input('name');
    $request = new UserCreateRequest($name);
    $response = $interactor->handle($request);
    $viewModel = new UserCreateViewModel($response->getCreatedUserId(), $name);
    return view('user.create', compact('viewModel'));
    }
    }

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  119. class UserController extends BaseController
    {
    public function create(UserCreateUseCaseInterface $interactor, Request $request)
    {
    $name = $request->input('name');
    $request = new UserCreateRequest($name);
    $response = $interactor->handle($request);
    $viewModel = new UserCreateViewModel($response->getCreatedUserId(), $name);
    return view('user.create', compact('viewModel'));
    }
    }

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  121. @Saga
    class SecureStockIssueSaga {
    @Transient
    @Autowired
    private lateinit var commandGateway: CommandGateway
    private lateinit var sagaState: SecureStockIssuerSagaState
    @StartSaga
    @SagaEventHandler(associationProperty = "secureStockId")
    fun on(event: SecureStockEvents.SecureStockIssued, @MessageIdentifier messageIdentifier: String) {
    sagaState = SecureStockIssuerSagaState(event.secureStockId, secureItemIdToNr = event.itemIdToNr)
    log("[START SAGA] Handling the Secure Stock Issued Event within the Saga ($sagaState).")
    sagaState.secureItemIdToNr.keys.forEach {
    SagaLifecycle.associateWith("itemId", it.asString())
    }
    val commands = event.itemIdToNr.map { (itemId, nr) ->
    ItemAggregateProtocol.SecureItem(itemId, event.secureStockId, nr, messageIdentifier)
    }
    val replies = commands.map { commandGateway.sendAndWait(it) }
    if (replies.any { it is ItemAggregateProtocol.SecureItemFailed }) {
    val secureSucceededList = replies.filterIsInstance()
    compensateSecureStockIssued(secureSucceededList)
    }
    }
    }

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  122. @Saga
    class SecureStockIssueSaga {
    @Transient
    @Autowired
    private lateinit var commandGateway: CommandGateway
    private lateinit var sagaState: SecureStockIssuerSagaState
    @StartSaga
    @SagaEventHandler(associationProperty = "secureStockId")
    fun on(event: SecureStockEvents.SecureStockIssued, @MessageIdentifier messageIdentifier: String) {
    sagaState = SecureStockIssuerSagaState(event.secureStockId, secureItemIdToNr = event.itemIdToNr)
    log("[START SAGA] Handling the Secure Stock Issued Event within the Saga ($sagaState).")
    sagaState.secureItemIdToNr.keys.forEach {
    SagaLifecycle.associateWith("itemId", it.asString())
    }
    val commands = event.itemIdToNr.map { (itemId, nr) ->
    ItemAggregateProtocol.SecureItem(itemId, event.secureStockId, nr, messageIdentifier)
    }
    val replies = commands.map { commandGateway.sendAndWait(it) }
    if (replies.any { it is ItemAggregateProtocol.SecureItemFailed }) {
    val secureSucceededList = replies.filterIsInstance()
    compensateSecureStockIssued(secureSucceededList)
    }
    }
    }

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  130. 伝統的なソフトウェア開発手法では高レベルなモジュールが低レベルな
    モジュールに依存する形で作成される傾向がありました。言い換えるな
    ら抽象が詳細に依存するような形で構築されていました。
    抽象が詳細に依存するようになると、低レベルのモジュールにおける方
    針の変更が高レベルのモジュールに波及します。これはおかしな話です。
    重要なドメインのルールが含まれるのはいつだって高レベルなモジュー
    ルです。低レベルなモジュールの変更を理由にして、重要な高レベルの
    モジュールを変更する
    (たとえばデータストアの変更を理由にビジネスロジックを変更する)な
    どということは起きてほしくない事態です。
    主体となるべきは高レベルなモジュール、すなわち抽象です。低レベル
    なモジュールが主体となるべきではありません。
    高レベルなモジュールは低レベルのモジュールを利用するクライアント
    です。クライアントがすべきはどのような処理を呼び出すかの宣言です。
    先述したとおり、インターフェースはそれを利用するクライアントが宣言す
    るものであり、主導権はそのクライアントにあります。インターフェースを宣
    言し、低レベルのモジュールはそのインターフェースに合わせて実装を行
    うことで、より重要な高次元の概念に主導権を握らせることが可能にな
    るのです。
    『ドメイン駆動設計入門 ボトムアップでわかる!ドメイン駆動設計の基本(翔泳社)』 7.3.2

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  132. OO
    Robert C. Martin
    『CleanArchitecture ( )』

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  163. OO
    Robert C. Martin
    『CleanArchitecture ( )』

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  185. OO
    Robert C. Martin
    『CleanArchitecture ( )』

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