Initial

dependency_injection/main.go

@@ -0,0 +1,51 @@
+package main
+
+import "fmt"
+
+type Repository interface {
+	Save(user *User) error
+}
+
+type User struct {
+	firstName  string
+	lastName   string
+	repository Repository
+}
+
+func NewUser(firstName string, lastName string, repository Repository) *User {
+	return &User{
+		firstName:  firstName,
+		lastName:   lastName,
+		repository: repository,
+	}
+}
+
+func (u User) Save() {
+	u.repository.Save(&u)
+}
+
+type DbRepository struct {
+	DbName string
+}
+
+func (r DbRepository) Save(user *User) error {
+	fmt.Printf("Saving %s %s to DB name %s...\n", user.firstName, user.lastName, r.DbName)
+	return nil
+}
+
+type ApiRepository struct {
+	Url string
+}
+
+func (r ApiRepository) Save(user *User) error {
+	fmt.Printf("Saving %s %s to API url %s...\n", user.firstName, user.lastName, r.Url)
+	return nil
+}
+
+func main() {
+	pero := NewUser("Pero", "Perić", &DbRepository{DbName: "pero_db"})
+	pero.Save()
+
+	mirko := NewUser("Mirko", "Mirković", &ApiRepository{Url: "http://pero.com"})
+	mirko.Save()
+}