first commit

src/Knowledge/Retrieval/CachedRetriever.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Knowledge\Retrieval;
+
+use Psr\Cache\CacheItemPoolInterface;
+
+final class CachedRetriever implements RetrieverInterface
+{
+    public function __construct(
+        private RetrieverInterface    $inner,
+        private CacheItemPoolInterface $cache,
+        private int                   $ttlSeconds = 600 // 10 Minuten
+    ) {}
+
+    public function retrieve(string $prompt, int $limit = 3): array
+    {
+        $key = $this->buildCacheKey($prompt, $limit);
+
+        $item = $this->cache->getItem($key);
+        if ($item->isHit()) {
+            return $item->get();
+        }
+
+        $result = $this->inner->retrieve($prompt, $limit);
+
+        $item->set($result);
+        $item->expiresAfter($this->ttlSeconds);
+        $this->cache->save($item);
+
+        return $result;
+    }
+
+    private function buildCacheKey(string $prompt, int $limit): string
+    {
+        $normalized = mb_strtolower(trim($prompt));
+        $normalized = preg_replace('/\s+/u', ' ', $normalized);
+
+        return 'rag_retrieval_' . sha1($normalized . '|' . $limit);
+    }
+}