zoukankan      html  css  js  c++  java
  • [VueJS + Typescript] Decouple Dependencies Using IoC Containers in Vue with TypeScript and InversifyJS

    Using Object Oriented Programming, OOP, style allows us to apply Inversion of Control, IoC, and more patterns. An IoC container helps decoupling dependencies by using a class constructor or properties to identify and inject its dependencies. This lesson will show you how can you create and use an IoC container to decouple an http client and users service dependencies in a Vue component with TypeScript and InversifyJS.

    When you are using Class, you also need to mantain the singleton of Class. Use can use similiar approach as Angular in VueJS as well.

    Install:

    npm i --save inversify reflect-metadata inversify-inject-decorators

    Modify tsconfig.json:

    {
      "compilerOptions": {
        "lib": [
          "dom",
          "es5",
          "es2015"
        ],
        "module": "es2015",
        "moduleResolution": "node",
        "target": "es5",
        "sourceMap": true,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "allowSyntheticDefaultImports": true
      }
    }

    main.ts:

    import "reflect-metadata"
    import "core-js/es6/map"
    import "core-js/es6/symbol"
    
    import Vue from 'vue'
    import App from './App.vue'
    
    Vue.config.productionTip = false
    
    /* eslint-disable no-new */
    new Vue({
      el: '#app',
      template: '<App/>',
      components: { App }
    })

    Tip: If you want to create unqiue String, you can use Symbol('UserService'), it is useful tool.

    Create a container.ts, which contains all the singleton services:

    import {Container} from 'inversify';
    import {UsersService} from './user-service';
    import {HttpClient} from './http-client';
    import {TYPES} from './types';
    import getDecorators from 'inversify-inject-decorators';
    
    const container = new Container();
    
    container.bind<UserService>(TYPES.UsersService).to(UsersService);
    container.bind<HttpClient>(TYPES.HttpClient).to(HttpClient);
    
    // Lazy inject is good for props
    const {lazyInject} = getDecorators(container);
    
    export {container, lazyInject}

    Create types.ts:

    export const TYPES = {
        UsersService: Symbol('UsersService'),
        HttpClient: Symbol('HttpClient')
    }

    http-client.ts:

    From:

    export class HttpClient {
        get(url: string): Promise<any> {
            return fetch(url).then(data => data.json())
        }
    }

    To:

    import {injectable} from 'inversify';
    
    @injectable()
    export class HttpClient {
        get(url: string): Promise<any> {
            return fetch(url).then(data => data.json())
        }
    }

    user-service.ts:

    From:

    export class UsersService {
        private http: HttpClient;
    
        constructor() {
            this.http = new HttpClient()
        }
    
        getUsers(): Promise<any> {
            return this.http.get('https://jsonplaceholder.type');
        }
    }

    To:

    import {inject, injectable} from 'inversify';
    import {TYPES} from './types';
    
    @injectable()
    export class UsersService {
    
        constructor(@inject(TYPES.HttpClient) private http) {
        }
    
        getUsers(): Promise<any> {
            return this.http.get('https://jsonplaceholder.type');
        }
    }

    Then we can use UsersService in App.vue:

    <script lang="ts">
    import Vue from 'vue'
    import Component from 'vue-class-component'
    import { lazyInject } from './container'
    import { TYPES } from './types'
    @Component
    export default class App extends Vue {
      users = []
      @lazyInject(TYPES.UsersService)
      usersService
      created() {
        this.usersService.getUsers()
          .then(data => {
            this.users = data
          })
      }
    }
    </script>
  • 相关阅读:
    MyBatis常见面试题以及解读
    如何防止sql注入攻击
    宝塔Linux面板基础命令
    Centos7配置静态ip
    宝塔Linux面板安装
    idea中安装阿里巴巴的代码规范插件
    idea中快速将类中的属性转为Json字符串的插件
    创建线程的四种方式
    sleep()方法与wait()方法的区别
    解决线程安全的几种方式
  • 原文地址:https://www.cnblogs.com/Answer1215/p/9545719.html
Copyright © 2011-2022 走看看