Create a cached wishlist checker

src/Checker/CachedWishlistChecker.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Setono\SyliusWishlistPlugin\Checker;
+
+use Sylius\Component\Core\Model\ProductInterface;
+use Sylius\Component\Core\Model\ProductVariantInterface;
+
+final class CachedWishlistChecker implements WishlistCheckerInterface
+{
+    /** @var array<string, bool> */
+    private array $cache = [];
+
+    public function __construct(private readonly WishlistCheckerInterface $decorated)
+    {
+    }
+
+    public function onWishlist(ProductInterface|ProductVariantInterface $product): bool
+    {
+        $key = spl_object_hash($product);
+
+        if (!array_key_exists($key, $this->cache)) {
+            $this->cache[$key] = $this->decorated->onWishlist($product);
+        }
+
+        return $this->cache[$key];
+    }
+}

src/Resources/config/services/checker.xml

@@ -8,5 +8,10 @@
         <service id="Setono\SyliusWishlistPlugin\Checker\WishlistChecker">
             <argument type="service" id="Setono\SyliusWishlistPlugin\Provider\WishlistProviderInterface"/>
         </service>
+
+        <service id="Setono\SyliusWishlistPlugin\Checker\CachedWishlistChecker"
+                 decorates="Setono\SyliusWishlistPlugin\Checker\WishlistCheckerInterface" decoration-priority="64">
+            <argument type="service" id="Setono\SyliusWishlistPlugin\Checker\CachedWishlistChecker.inner"/>
+        </service>
     </services>
 </container>