import { Injectable } from '@angular/core';

@Injectable()
export class MyService {

    private connection;

    constructor() {

        this.connect().then((connection) => {
            this.connection = connection;
            // Components should be able to consume this service once execution reaches this point, but not before!
        });

    }

    private connect(): Promise<any> {
        // (return some promise which will eventually resolve with a connection)
    }

    public getData(key: string): string {
        // (this method won't be usable until the .then() in the constructor has run)
    }


}