javascript - Aurelia辅助注入(inject)？

Question

我有一个类，它的构造函数有两个参数；一个是依赖项，另一个是配置属性:

@inject(Dependency)
class MyClass{
  constructor(dependency, config){
  }
}

我如何利用 Aurelia 的依赖注入(inject)来自动注入(inject)依赖，但允许类的使用者指定配置值？

Answer 1

这里有一些选项:

---

选项 0:工厂解析器

foo.js

import {inject} from 'aurelia-framework';
import {FooDependency} from './foo-dependency';

@inject(FooDependency)
export class Foo {
  constructor(dep, config) {
  }
}

需要-foo.js

import {inject, Factory} from 'aurelia-framework';
import {Foo} from './foo';

@inject(Factory.of(Foo))
export class NeedsFoo {
  constructor(fooFactory) {
    let config = {};
    this.foo = fooFactory(config);
  }
}

---

选项 1:工厂

foo.js

import {inject} from 'aurelia-framework';
import {FooDependency} from './foo-dependency';

class Foo {
  constructor(dep, config) {
  }
}

@inject(FooDependency)
export class FooFactory {
  constructor(dep) {
    this.dep = dep;
  }

  makeFoo(config) {
    return new Foo(this.dep, config);
  }
}

需要-foo.js

import {inject} from 'aurelia-framework';
import {FooFactory} from './foo';

@inject(FooFactory)
export class NeedsFoo {
  constructor(fooFactory) {
    let config = {};
    this.foo = fooFactory.makeFoo(config);
  }
}

---

选项 2:子容器

foo.js

import {inject} from 'aurelia-framework';
import {FooDependency} from './foo-dependency';

export const configKey = 'config';

@inject(FooDependency, configKey)
export class Foo {
  constructor(dep, config) {
  }
}

需要-foo.js

import {inject, Container} from 'aurelia-framework';
import {Foo, configKey} from './foo';

@inject(Container)
export class NeedsFoo {
  constructor(container) {
    let config = {};
    let childContainer = container.createChild();
    childContainer.registerInstance(configKey, config);
    this.foo = childContainer.get(Foo);
  }
}

---

选项 3:蛮力

foo.js

export class Foo {
  constructor(dep, config) {
  }
}

需要-foo.js

import {inject, Container} from 'aurelia-framework';
import {FooDependency} from './foo-dependency';
import {Foo} from './foo';

@inject(Container)
export class NeedsFoo {
  constructor(container) {
    let config = {};
    let dep = container.get(FooDependency);
    this.foo = new Foo(dep, config);
  }
}