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app/Services/BookInformation/CachedService.php

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+<?php
+
+namespace App\Services\BookInformation;
+
+use Cache;
+
+class CachedService implements BookLookupService {
+    private $service;
+
+    public function __construct($service) {
+        $this->service = $service;
+    }
+
+    public function lookup($isbn) {
+        return Cache::remember('isbn_' . $isbn, 86400, function() use ($isbn) {
+            return $this->service->lookup($isbn);
+        });
+    }
+}