Implement a caching mechanism

src/Controller/DiscontinuedController.php

@@ -13,12 +13,15 @@ final class DiscontinuedController extends BaseController
     #[Route('/discontinued', name: 'app_discontinued')]
     public function __invoke(): Response
     {
+        if($this->cache->getItem('list_discontinued')->isHit()) {
+            return $this->render('productList.html.twig', ['listType' => 'discontinued']);
+        }
 
         $products = Product::where('updated_at', '<', now()->format('Y-m-d'))
             ->orderByDesc('starred')
             ->orderByDesc('created_by')
             ->with(['currentPrice'])
             ->get();
-        return $this->render('productList.html.twig', ['products' => $products]);
+        return $this->render('productList.html.twig', ['products' => $products, 'listType' => 'discontinued']);
     }
 }