export class SubscriptionToken {
  constructor(
    public handler: (payload: unknown) => void,
    public parent: unknown,
    private executeInSeparateEvent: boolean,
    private filter?: (a: any) => boolean
  ) {}
  public execute(payload: any): void {
    if (typeof this.filter === 'undefined' || this.filter(payload) === true) {
      if (this.executeInSeparateEvent) {
        setTimeout(() => {
          this.invokeHandler(payload);
        });
      } else {
        this.invokeHandler(payload);
      }
    }
  }

  private invokeHandler(payload: any) {
    if (typeof this.parent !== 'undefined') {
      this.handler.call(this.parent, payload);
    } else {
      this.handler(payload);
    }
  }
}