Add CacheableDispatcherFactoryProxy

Author: n.gnato

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Data Transfer Object classes generation from swagger spec
 - JsonApiResponseFactory::createResponse() `meta` and `links` arguments 
+- CacheableDispatcherFactoryProxy
 
 ## [0.0.13] - 2021-01-27
 ### Added

composer.json

@@ -22,8 +22,9 @@
         "neomerx/json-api": "^4.0",
         "nette/php-generator": "^3.4",
         "nikic/fast-route": "^1.3",
-        "psr/http-message": "^1.0",
+        "psr/cache": "^1.0",
         "psr/http-factory": "^1.0",
+        "psr/http-message": "^1.0",
         "psr/http-server-handler": "^1.0",
         "psr/http-server-middleware": "^1.0",
         "rakit/validation": "^1.2",

src/FreeElephants/JsonApiToolkit/Routing/FastRoute/CacheableDispatcherFactoryProxy.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace FreeElephants\JsonApiToolkit\Routing\FastRoute;
+
+use FastRoute\Dispatcher;
+use Psr\Cache\CacheItemPoolInterface;
+
+class CacheableDispatcherFactoryProxy implements DispatcherFactoryInterface
+{
+    private DispatcherFactoryInterface $dispatcherFactory;
+    private CacheItemPoolInterface $cacheItemPool;
+
+    public function __construct(DispatcherFactoryInterface $dispatcherFactory, CacheItemPoolInterface $cacheItemPool)
+    {
+        $this->dispatcherFactory = $dispatcherFactory;
+        $this->cacheItemPool = $cacheItemPool;
+    }
+
+    public function buildDispatcher(string $openApiDocumentSource): Dispatcher
+    {
+        $key = md5_file($openApiDocumentSource);
+        $cacheItem = $this->cacheItemPool->getItem($key);
+        if ($cacheItem->isHit()) {
+            $dispatcher = $cacheItem->get();
+        } else {
+            $dispatcher = $this->dispatcherFactory->buildDispatcher($openApiDocumentSource);
+            $cacheItem->set($dispatcher);
+            $this->cacheItemPool->save($cacheItem);
+        }
+
+        return $dispatcher;
+    }
+}