Angular2“服务”如何@将一个服务注入另一个(单身人士)

我有一个问题,我不知道在哪里可以问这个问题,但是在这里。

我将如何注入一个服务到另一个?例如说我有一个需要另一个集合(TeamCollection => PlayerCollection)的集合。目前我只创建两个单独的集合,并使用如下所示:

import {PlayerCollection} from "<<folder>>/player";

但是这需要我在Typescript中为每个想要作为单例实例的每个服务编写自己的单例getInstance代码。

现在我想知道做什么是正确的方法?在我的组件中有两个单例,并且可以使用构造函数语法将一个服务注入另一个。没有创建它们的新实例。

class TeamCollection {    
    constructor(@Inject(PlayerCollection): PlayerCollection) {}
}
所以在重新阅读Pascal Precht:http://blog.thoughtram.io/angular/2015/05/18/dependency-injection-in-angular-2.html这个优秀的帖子后

看到他评论:http://twofuckingdevelopers.com/2015/04/angular-2-singleton-service/

“使用角度2的DI注入的所有内容已经是单身人士,不需要这样的服务”

我去测试,我现在发现的两个都回答了我的问题,使我更加困惑于DI在角色2的话题。

请参阅以下代码:

team.ts

import {BaseCollection, BaseModel} from "./base";
import {PlayerCollection} from './player';
import {Injectable, Inject} from "angular2/angular2";

@Injectable()
export class TeamCollection extends BaseCollection {
    playerCollection: PlayerCollection;
    constructor(@Inject(PlayerCollection) playerCollection: PlayerCollection) {
        super();
        this.playerCollection = playerCollection;
    }

    create(data: Object): TeamModel {
        return new TeamModel(data);
    }
}

player.ts

import {BaseCollection, BaseModel} from "./base";
import {Injectable} from "angular2/angular2";

@Injectable()
export class PlayerCollection extends BaseCollection {
    create(data: Object): PlayerModel {
        return new PlayerModel(data);
    }
}

team.spec.ts

/// <reference path="../../typings.d.ts" />

//VERY IMPORTANT TO ALWAYS LOAD THESE
import 'zone.js';
import 'reflect-metadata';
import 'es6-shim';

import {TeamModel, TeamCollection} from "../../app/model/team";
import {PlayerCollection} from "../../app/model/player";
import {Inject, Injector} from "angular2/angular2";

describe('TeamCollection', () => {
  var teamCollection: TeamCollection;
  var playerCollection: PlayerCollection; 
  beforeEach(() => {
      var injector = Injector.resolveAndCreate([
        TeamCollection,
        PlayerCollection
      ]);
      teamCollection = injector.get(TeamCollection);  

      var injectorT = Injector.resolveAndCreate([
        PlayerCollection
      ]);
      playerCollection = injector.get(PlayerCollection);
  });

  it('should have a singleton PlayerCollection shared between all classes within the application', () => {
    console.log(teamCollection.playerCollection.uuId);
    console.log(playerCollection.uuId);
  });  
});

只要它们是相同的注射器(var injection),它们都共享相同的uuID虽然当我使用第二个注射器(var injectorT)时,UUID是不同的,意味着创建一个新的实例来播放PlayerCollection。

现在我的问题是如果我使用组件提供者语法:

@Component({
  selector: 'app',
  providers: [TeamCollection]
}) 

@Component({
  selector: 'player-list',
  providers: [PlayerCollection]
})

两者都会共享同一个玩家集合,还是会创建一个新的实例?

编辑:
只要通过引导(..,[ServiceA,ServiceB])方法创建它们即可。

感谢pascal precht http://blog.thoughtram.io/angular/2015/09/17/resolve-service-dependencies-in-angular-2.html

翻译自:https://stackoverflow.com/questions/33575456/angular2-services-how-to-inject-one-service-into-another-singletons

转载注明原文:Angular2“服务”如何@将一个服务注入另一个(单身人士)