DI: constructor of class how injectable calls serveral times

Question

There are several classes, how injected TermsExchangeService:

import {TermsExchangeService} from './terms-exchange.service';

@injectable()
export class TermsExchangeComponent {
  constructor(
        private termsExchangeService: TermsExchangeService
    ) {}
}

and

import {TermsExchangeService} from './terms-exchange.service';

@injectable()
export class PurchaseMainComponent {
    constructor(
       private termsExchangeService: TermsExchangeService
    ) {}

and service how has been used in PurchaseMainComponent and TermsExchangeComponent

@injectable()
export class TermsExchangeService {

    constructor() {
        debugger; // call 2 times!!!
    }
}

I use autoBindInjectable:

var simpleContainer = new Container({ autoBindInjectable: true })

When getting components from loop constructor of TermsExchangeService call several times:

for (let item = 0; item < components.length; item++) {
   const container = simpleContainer.get(components[item]);
}

Why object created in every components? And how do normal injections?

score 0 · Accepted Answer · answered May 30 '19 at 06:19

By default injectable is not Singleton.

Solve this problem can adding defaultScope: 'Singleton':

var simpleContainer = new Container(
            { 
               autoBindInjectable: true, 
               defaultScope: 'Singleton'
            }
)

DI: constructor of class how injectable calls serveral times

1 Answers1