update deps & install rector

Behavioral/ChainOfResponsibilities/Handler.php

@@ -3,14 +3,10 @@
 namespace DesignPatterns\Behavioral\ChainOfResponsibilities;
 
 use Psr\Http\Message\RequestInterface;
-use Psr\Http\Message\ResponseInterface;
 
 abstract class Handler
 {
-    /**
-     * @var Handler|null
-     */
-    private $successor = null;
+    private ?Handler $successor = null;
 
     public function __construct(Handler $handler = null)
     {
@@ -20,12 +16,8 @@ abstract class Handler
     /**
      * This approach by using a template method pattern ensures you that
      * each subclass will not forget to call the successor
-     *
-     * @param RequestInterface $request
-     *
-     * @return string|null
      */
-    final public function handle(RequestInterface $request)
+    final public function handle(RequestInterface $request): ?string
     {
         $processed = $this->processing($request);
 
@@ -37,5 +29,5 @@ abstract class Handler
         return $processed;
     }
 
-    abstract protected function processing(RequestInterface $request);
+    abstract protected function processing(RequestInterface $request): ?string;
 }

Behavioral/ChainOfResponsibilities/Responsible/HttpInMemoryCacheHandler.php

@@ -7,28 +7,16 @@ use Psr\Http\Message\RequestInterface;
 
 class HttpInMemoryCacheHandler extends Handler
 {
-    /**
-     * @var array
-     */
-    private $data;
+    private array $data;
 
-    /**
-     * @param array $data
-     * @param Handler|null $successor
-     */
-    public function __construct(array $data, Handler $successor = null)
+    public function __construct(array $data, ?Handler $successor = null)
     {
         parent::__construct($successor);
 
         $this->data = $data;
     }
 
-    /**
-     * @param RequestInterface $request
-     *
-     * @return string|null
-     */
-    protected function processing(RequestInterface $request)
+    protected function processing(RequestInterface $request): ?string
     {
         $key = sprintf(
             '%s?%s',

Behavioral/ChainOfResponsibilities/Responsible/SlowDatabaseHandler.php

@@ -7,12 +7,7 @@ use Psr\Http\Message\RequestInterface;
 
 class SlowDatabaseHandler extends Handler
 {
-    /**
-     * @param RequestInterface $request
-     *
-     * @return string|null
-     */
-    protected function processing(RequestInterface $request)
+    protected function processing(RequestInterface $request): ?string
     {
         // this is a mockup, in production code you would ask a slow (compared to in-memory) DB for the results
 

Behavioral/ChainOfResponsibilities/Tests/ChainTest.php

@@ -5,17 +5,13 @@ namespace DesignPatterns\Behavioral\ChainOfResponsibilities\Tests;
 use DesignPatterns\Behavioral\ChainOfResponsibilities\Handler;
 use DesignPatterns\Behavioral\ChainOfResponsibilities\Responsible\HttpInMemoryCacheHandler;
 use DesignPatterns\Behavioral\ChainOfResponsibilities\Responsible\SlowDatabaseHandler;
-use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\UriInterface;
 
 class ChainTest extends TestCase
 {
-    /**
-     * @var Handler
-     */
-    private $chain;
+    private Handler $chain;
 
     protected function setUp(): void
     {