Introducing Wire: Dependency Injection by Code Generator

Transcript

1. JTILBXB
   8JSF
   ίʔυੜ੒ʹΑΔ%*
   

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4. %*
   

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5. %FQFOEFODZ*OKFDUJPO
   

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

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7. io.Reader
   json.Decoder
   

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8. Bookshelf
   Service
   BookRepository
   BookOwnership
   Repository
   Notification
   Repository
   Inbox
   Service
   UserRepository
   API
   Server
   Job A
   Job B
   Datastore
   Client
   

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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()
   }
   

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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
    

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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
    

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15. %*ʹඞཁͳίʔυ
    

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16. %*ʹඞཁͳίʔυ
    ຊ࣭ ࣗ໌
    

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17. %*ʹඞཁͳίʔυ
    ͜͜Λࣗಈੜ੒
    ຊ࣭ ࣗ໌
    

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18. ຊ࣭ͱ͸
    

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19. w ͲͷΑ͏ͳґଘ͕͋Δͷ͔
    w Ͳ͏΍ͬͯґଘΛऔಘ͢Δͷ͔
    

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20. w 1SPWJEFS
    w *OKFDUPS
    

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21. 1SPWJEFS
    

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

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23. Bookshelf
    Service
    BookRepository
    BookOwnership
    Repository
    Notification
    Repository
    Inbox
    Service
    UserRepository
    API
    Server
    Job A
    Job B
    Datastore
    Client
    1SPWJEFS
    

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24. Bookshelf
    Service
    BookRepository
    BookOwnership
    Repository
    Notification
    Repository
    Inbox
    Service
    UserRepository
    API
    Server
    Job A
    Job B
    Datastore
    Client
    1SPWJEFS
    

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25. Bookshelf
    Service
    BookRepository
    BookOwnership
    Repository
    Notification
    Repository
    Inbox
    Service
    UserRepository
    API
    Server
    Job A
    Job B
    Datastore
    Client
    1SPWJEFS
    

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26. Bookshelf
    Service
    BookRepository
    BookOwnership
    Repository
    Notification
    Repository
    Inbox
    Service
    UserRepository
    API
    Server
    Job A
    Job B
    Datastore
    Client
    1SPWJEFS
    

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27. *OKFDUPS
    

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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
    }
    

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29. $ wire ./...
    

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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
    }
    

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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
    ίʔυ͕ࣗಈੜ੒͞Εͨ
    

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33. ࣮͸͜ΕΒ΋ࣗಈੜ੒Ͱ͖Δ
    w ύϥϝʔλʔͷड͚౉͠
    w Τϥʔॲཧ
    w ΫϦʔϯΞοϓॲཧ
    

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34. ָͳ͚ͩͰ͸ͳ͍
    

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35. ίʔυੜ੒ʹΑΔґଘؔ܎ͷղܾͳͷͰ
    άϥϑͷܽଛΛίϯύΠϧ࣌ʹൃݟͰ͖Δ
    

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36. ·ͱΊ
    

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37. w 8JSF͸%*ͷࣗ໌ͳίʔυΛࣗಈੜ੒͢Δπʔϧ
    w ґଘؔ܎͸ίϯύΠϧ࣌ʹղܾ͞ΕΔͷͰ҆શ
    

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38. IUUQTHJUIVCDPNHPPHMFXJSF
    

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