I understand using observable I can execute a method when the request is completed, but how can i wait till a http get is completed and return the response using in ng2 http?

getAllUser(): Array<UserDTO> {

    this.value = new Array<UserDTO>();

    this.http.get(MY_URL)

                    .map(res => res.json())

                    .subscribe(

                        data => this.value = data,

                        err => console.log(err),

                        () => console.log(Completed)

    );



    return this.value;

} 

the value will is null when its returned because get is async..