rxjs在订阅处理程序中创建计时器?

我订阅了一个Observable,并试图在Observable的最后一个Emit值5秒后运行一个计时器处理程序。然后定时器在下一次发射时重置

// If the service does not emit for 5 second, the timeout handler is called, 
// then the timer begins again on the next service emit
service.on('update')
            .subscribe((event) => {                
                this.updateCounter(event);
                // Clear previous timer
                this.timerSub && this.timerSub.unsubscribe()
                // Create new timer
                this.timerSub = timer(5000)
                    .subscribe( () => {
                        this.timerHandler();
                    });
            });

....
timerHandler() {
   // do something
} 

这很好用,但我想知道是否有一种方法更符合rxjs模式?