Introducing Wire: Dependency Injection by Code Generator

Transcript

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6. package json func NewDecoder(r io.Reader) *Decoder { return &Decoder{r: r}

   }

7. io.Reader json.Decoder

8. Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository

   API Server Job A Job B Datastore Client

9. func main() { ctx := context.Background() client, err := datastore.NewClient(ctx,

   "my-project") if err != nil { log.Fatal(err) } defer client.Close() bookRepository := NewBookRepository(client) bookOwnershipRepository := NewBookOwnershipRepository(client) userRepository := NewUserRepository(client) notificationRepository := NewNotificationRepository(client) bookshelfService := NewBookshelfService(bookRepository, bookOwnershipRepository, inboxService := NewInboxService(userRepository, notificationRepository) server := NewAPIServer(bookshelfService, inboxService) server.Listen() }

10. Shopping Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository

    Admin Server Job A Job B PubSub Client Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository API Server Job A Job B Datastore Client Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository API Server Job A Job B Datastore Client Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository API Server Job A Job B Datastore Client Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository API Server Job A Job B Datastore Client Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository API Server Job A Job B Datastore Client Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository API Server Job A Job B Datastore Client Recommend Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository Job C Job D Functions Client Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository API Server Job A Job B Datastore Client Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository API Server Job A Job B Datastore Client Bookshelf Service BookRepository BookOwnership Repository ReadHistory Repository History Service UserRepository API Server Job A Job B Datastore Client

11. notificationRepository := NewNotificationRepository() bookshelfService := NewBookshelfService( bookRepository, bookOwnershipRepository, userRepository) inboxService

    := NewInboxService( userRepository, notificationRepository) bookRepository := NewBookRepository() bookOwnershipRepository := NewBookOwnershipRepository() userRepository := NewUserRepository() notificationRepository := NewNotificationRepository() bookshelfService := NewBookshelfService( bookRepository, bookOwnershipRepository, userRepository) inboxService := NewInboxService( userRepository, notificationRepository) bookRepository := NewBookRepository() bookOwnershipRepository := NewBookOwnershipRepository() userRepository := NewUserRepository() notificationRepository := NewNotificationRepository() bookshelfService := NewBookshelfService( bookRepository, bookOwnershipRepository, userRepository) inboxService := NewInboxService( userRepository, notificationRepository) bookRepository := NewBookRepository() bookOwnershipRepository := NewBookOwnershipRepository() userRepository := NewUserRepository() notificationRepository := NewNotificationRepository() bookshelfService := NewBookshelfService( bookRepository, bookOwnershipRepository, userRepository) inboxService := NewInboxService( userRepository, notificationRepository) bookRepository := NewBookRepository() bookOwnershipRepository := NewBookOwnershipRepository() userRepository := NewUserRepository() notificationRepository := NewNotificationRepository() bookshelfService := NewBookshelfService( bookRepository, bookOwnershipRepository, userRepository) inboxService := NewInboxService( userRepository, notificationRepository) bookRepository := NewBookRepository() bookOwnershipRepository := NewBookOwnershipRepository() userRepository := NewUserRepository() notificationRepository := NewNotificationRepository() bookshelfService := NewBookshelfService( bookRepository, bookOwnershipRepository, userRepository) inboxService := NewInboxService( userRepository, notificationRepository) bookRepository := NewBookRepository() bookOwnershipRepository := NewBookOwnershipRepository() userRepository := NewUserRepository() notificationRepository := NewNotificationRepository() bookshelfService := NewBookshelfService( bookRepository, bookOwnershipRepository, userRepository) inboxService := NewInboxService(
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13. 8JSF

14. None

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16. %*ʹඞཁͳίʔυ ຊ࣭ ࣗ໌

17. %*ʹඞཁͳίʔυ ͜͜Λࣗಈੜ੒ ຊ࣭ ࣗ໌

18. ຊ࣭ͱ͸

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20. w 1SPWJEFS
    w *OKFDUPS

21. 1SPWJEFS

22. func NewBookRepository(client *datastore.Client) BookRepository { ... }

23. Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository

    API Server Job A Job B Datastore Client 1SPWJEFS

24. Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository

    API Server Job A Job B Datastore Client 1SPWJEFS

25. Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository

    API Server Job A Job B Datastore Client 1SPWJEFS

26. Bookshelf Service BookRepository BookOwnership Repository Notification Repository Inbox Service UserRepository

    API Server Job A Job B Datastore Client 1SPWJEFS

27. *OKFDUPS

28. // +build wireinject ... func InitializeServer( ctx context.Context, projectID ProjectID)

    (server *Server, cleanup func(), err error) { wire.Build( ProvideDatastoreClient, NewBookRepository, NewBookOwnershipRepository, NewUserRepository, NewNotificationRepository, NewBookshelfService, NewInboxService, NewAPIServer) return }

29. $ wire ./...

30. //+build !wireinject ... func InitializeServer( ctx context.Context, projectID ProjectID) (*Server,

    func(), error) { client, cleanup, err := ProvideDatastoreClient(ctx, projectID) if err != nil { return nil, nil, err } bookRepository := NewBookRepository(client) bookOwnershipRepository := NewBookOwnershipRepository(client) userRepository := NewUserRepository(client) notificationRepository := NewNotificationRepository(client) bookshelfService := NewBookshelfService(bookRepository, bookOwnershipRepository, inboxService := NewInboxService(userRepository, notificationRepository) server := NewAPIServer(bookshelfService, inboxService) return server, func() { cleanup() }, nil }

31. //+build !wireinject ... func InitializeServer( ctx context.Context, projectID ProjectID) (*Server,

    func(), error) { client, cleanup, err := ProvideDatastoreClient(ctx, projectID) if err != nil { return nil, nil, err } bookRepository := NewBookRepository(client) bookOwnershipRepository := NewBookOwnershipRepository(client) userRepository := NewUserRepository(client) notificationRepository := NewNotificationRepository(client) bookshelfService := NewBookshelfService(bookRepository, bookOwnershipRepository, inboxService := NewInboxService(userRepository, notificationRepository) server := NewAPIServer(bookshelfService, inboxService) return server, func() { cleanup() }, nil } ैདྷखॻ͖͍ͯͨ͠
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