How to inject multiple service instances in angular components of same service?

Question

How to inject multiple service instances into angular components of the same service?

For example - I have dbService in my code and I want to call this dbService instance two times and init both the services with two different values in the constructor. But When I create two instances in component like

constructor( private db1:dbService, private db2:dBservice ){}

It is basically same instance being injected. How to implement such use case in angular 2+ or later.

Possible duplicate of [Angular2 DI - initializing multiple different instances in the same constructor](https://stackoverflow.com/questions/38213995/angular2-di-initializing-multiple-different-instances-in-the-same-constructor) — rrd, Jan 25 '18 at 22:11

score 2 · Answer 1 · answered Jan 25 '18 at 23:53

You can create a method in your service which return you instance of that service. something like this -

public static instance: dbService;
public static getInstance(http: Http): dbService {
    if (!dbService.instance) {
        dbService.instance = new dbService(http);
    }
    return dbService.instance;
}
private constructor(public http: Http) {
}

PRIVATE CONSTRUCTOR TO MAKE SURE THAT IT CAN'T BE CALLED FROM OUTSIDE

Then in your component you can call getInstance() method as many times as you want.

How to inject multiple service instances in angular components of same service?

1 Answers1