问题描述
简单情况:
我有多个实现通用接口的服务.所有这些服务都在bootstrap方法中注册.
I have multiple Services that implement a common Interface. All those Services are registered within the bootstrap method.
现在我想拥有另一个服务，该服务将注入所有注册的实现公共接口的服务.
Now I'd like to have another Service, which injects all registered Services that implement the common Interface.
即
export interface MyInterface {
foo(): void;
}
export class Service1 implements MyInterface {
foo() { console.out("bar"); }
}
export class Service2 implements MyInterface {
foo() { console.out("baz"); }
}
export class CollectorService {
constructor(services:MyInterface[]) {
services.forEach(s => s.foo());
}
}
有可能吗?
推荐答案
您需要这样注册您的服务提供商:
You need to register your service providers like this:
boostrap(AppComponent, [
provide(MyInterface, { useClass: Service1, multi:true });
provide(MyInterface, { useClass: Service2, multi:true });
]);
这仅适用于没有接口的类，因为接口在运行时不存在.
This will work only with classes not with interfaces since interfaces don't exist at runtime.
要使其与接口配合使用，您需要对其进行调整:
To make it work with interfaces, you need to adapt it:
bootstrap(AppComponent, [
provide('MyInterface', { useClass: Service1, multi:true }),
provide('MyInterface', { useClass: Service2, multi:true }),
CollectorService
]);
并以这种方式注入:
@Injectable()
export class CollectorService {
constructor(@Inject('MyInterface') services:MyInterface[]) {
services.forEach(s => s.foo());
}
}
有关更多详细信息，请参见此plunkr: https://plnkr.co/edit/HSqOEN?p =预览.
See this plunkr for more details: https://plnkr.co/edit/HSqOEN?p=preview.
有关更多详细信息，请参见此链接:
See this link for more details:
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