}
@RequestMapping(method=RequestMethod.POST)
public String placeOrder(@RequestParam String email, @RequestParam int quantity, @RequestParam String productId, Model model) {
long orderId = orderIdCounter.getAndIncrement();
Order order = new Order(orderId);
order.setEmail(email);
order.setQuantity(quantity);
order.setProductId(productId);
MessagingTemplate template = new MessagingTemplate(this.orderChannel);
template.convertAndSend(order);
model.addAttribute("orderId", orderId);
return "order";
}