Services Base Class

services.ts

class Service {

  constructor() {
    this._onReady = new Promise<void>((resolve, reject) => {
       this._finishInit = resolve;
    });
  }

  /**
   * Promise fullfilled when the object is initialized.
   */
  get onReady(): Promise<void> {
    return this._onReady;
  }

  /**
   * Handle initialization, fulfilling the onReady promise on the first call.
   */
  protected _initReady(): void {
    var callback = this._finishInit;
    if (callback) {
      this._finishInit = null;
      callback();
    }
  }
   
  private _onReady: Promise<void> = null;
  private _finishInit: () => void = null;
}