iface

package

v0.3.2 Latest Latest Go to latest Published: Oct 12, 2026 License: MIT Imports: 3 Imported by: 0

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var AppGraph = loom.Graph[*App](
	loom.Provide(NewDB),
	loom.As[UserStore](NewUserStore),
	loom.Provide(NewUserService),
	loom.Provide(NewApp),
)

AppGraph wires *userStore into UserStore via loom.As.

func NewUserStore(db *DB) *userStore

NewUserStore returns the concrete store; note it is unexported, so only the interface escapes the package.

type App struct {
	Service *UserService
}

App is the assembled application.

func InitApp() (*App, *loom.Lifecycle, error)

InitApp builds *App from the graph declared by AppGraph.

func NewApp(svc *UserService) *App

NewApp builds the application.

type DB struct {
	Users map[int64]*User
}

DB is a placeholder database handle.

func NewDB() *DB

NewDB opens the database and seeds one user.

type User struct {
	ID   int64
	Name string
}

User is a domain entity.

type UserService struct {
	Store UserStore
}

UserService depends on the interface, not the implementation.

func NewUserService(store UserStore) *UserService

NewUserService builds the service.

type UserStore interface {
	Find(ctx context.Context, id int64) (*User, error)
}

UserStore is the persistence boundary the service depends on.