feat(handler): Create JsonSerializable handler

src/Handler/JsonSerializableHandler.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace JMS\Serializer\Handler;
+
+use JMS\Serializer\Visitor\SerializationVisitorInterface;
+
+final class JsonSerializableHandler
+{
+    public function __invoke(SerializationVisitorInterface $visitor, \JsonSerializable $object)
+    {
+        return $object->jsonSerialize();
+    }
+}

tests/Benchmark/AbstractSerializationBench.php

@@ -4,6 +4,7 @@
 
 namespace JMS\Serializer\Tests\Benchmark;
 
+use JMS\Serializer\Handler\HandlerRegistryInterface;
 use JMS\Serializer\SerializationContext;
 use JMS\Serializer\Serializer;
 use JMS\Serializer\SerializerBuilder;
@@ -46,7 +47,10 @@ abstract class AbstractSerializationBench
 
     public function __construct()
     {
-        $this->serializer = SerializerBuilder::create()->build();
+        $this->serializer = SerializerBuilder::create()
+            ->configureHandlers(\Closure::fromCallable([$this, 'configureHandlers']))
+            ->addDefaultHandlers()
+            ->build();
         $this->collection = $this->createCollection();
         $this->format = $this->getFormat();
     }
@@ -89,4 +93,8 @@ private function createPost()
 
         return $post;
     }
+
+    protected function configureHandlers(HandlerRegistryInterface $handlerRegistry)
+    {
+    }
 }

tests/Benchmark/Performance/JsonSerializableBench.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace JMS\Serializer\Tests\Benchmark\Performance;
+
+use JMS\Serializer\GraphNavigatorInterface;
+use JMS\Serializer\Handler\HandlerRegistryInterface;
+use JMS\Serializer\Handler\JsonSerializableHandler;
+use JMS\Serializer\Tests\Benchmark\AbstractSerializationBench;
+use JMS\Serializer\Tests\Fixtures\Author;
+
+class JsonSerializableBench extends AbstractSerializationBench
+{
+    protected function getFormat(): string
+    {
+        return 'json';
+    }
+
+    protected function configureHandlers(HandlerRegistryInterface $handlerRegistry)
+    {
+        $handlerRegistry->registerHandler(GraphNavigatorInterface::DIRECTION_SERIALIZATION, Author::class, 'json', new JsonSerializableHandler());
+    }
+}

tests/Fixtures/Author.php

@@ -7,7 +7,7 @@
 use JMS\Serializer\Annotation\SerializedName;
 use JMS\Serializer\Annotation\Type;
 
-class Author
+class Author implements \JsonSerializable
 {
     /**
      * @Type("string")
@@ -26,4 +26,11 @@ public function getName()
     {
         return $this->name;
     }
+
+    public function jsonSerialize()
+    {
+        return [
+            'json_full_name' => $this->name,
+        ];
+    }
 }

tests/Handler/JsonSerializableHandlerTest.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace JMS\Serializer\Tests\Handler;
+
+use JMS\Serializer\Handler\JsonSerializableHandler;
+use JMS\Serializer\Tests\Fixtures\Author;
+use JMS\Serializer\Visitor\SerializationVisitorInterface;
+use PHPUnit\Framework\TestCase;
+
+final class JsonSerializableHandlerTest extends TestCase
+{
+    /** @var JsonSerializableHandler  */
+    private $handler;
+
+    public function testSerialize(): void
+    {
+        $data = new Author('scyzoryck');
+
+        $serialized = ($this->handler)($this->createMock(SerializationVisitorInterface::class), $data);
+
+        $this->assertEquals(['json_full_name' => 'scyzoryck'], $serialized);
+    }
+
+    protected function setUp(): void
+    {
+        $this->handler = new JsonSerializableHandler();
+    }
+}