원본 :
https://www.softwareontheroad.com/ideal-nodejs-project-structure/
Controller <-> Service Layer <-> Data Access Layer
For SOLID Principle & Clean Code , Split Response Code and Background process
Not include Model Query ( Query include Data Access Layer )
1. split Code in express Router
2. Service Layer doesn't include Req , Res Object
3. Service Layer doesn't include Status Code and Http Header
Compatible Dependency , Flexible Code
Unit Test for Service , Another Context can use Code
import UserModel from '../models/user';
import CompanyModel from '../models/company';
import SalaryModel from '../models/salary';
class UserService {
constructor(){}
Sigup(){
// Caling UserMode, CompanyModel, etc
...
}
}
각 Method 마다 따로따로 사용
export default class UserService {
constructor(userModel, companyModel, salaryModel){
this.userModel = userModel;
this.companyModel = companyModel;
this.salaryModel = salaryModel;
}
getMyUser(userId){
// models available throug 'this'
const user = this.userModel.findById(userId);
return user;
}
}
import UserService from '../services/user';
import UserModel from '../models/user';
import CompanyModel from '../models/company';
const salaryModelMock = {
calculateNetSalary(){
return 42;
}
}
const userServiceInstance = new UserService(userModel, companyModel, salaryModelMock);
const user = await userServiceInstance.getMyUser('12346');
=> typedi Library 사용
import { Service } from 'typedi';
@Service()
export default class UserService {
constructor(
private userModel,
private companyModel,
private salaryModel
){}
getMyUser(userId){
const user = this.userModel.findById(userId);
return user;
}
}
route.post('/',
async (req, res, next) => {
const userDTO = req.body;
const userServiceInstance = Container.get(UserService) // Service locator
const { user, company } = userServiceInstance.Signup(userDTO);
return res.json({ user, company });
});
Spring의 D.I와 매우 유사 , Container가 담당