bug #17140 [Serializer] Remove normalizer cache in Serializer class (jvasseur)

This PR was merged into the 2.3 branch.

Discussion
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[Serializer] Remove normalizer cache in Serializer class

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

The serializer cache the normalizer/denormalizer to use based only on the class and format. But the supportsNormalization and supportDenormalization methods can decide based on the data passed leading to hard to find bugs when the serializer used a cached normalizer it shouldn't use.

Commits
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8566dc1 Remove normalizer cache in Serializer class

Author: Tobion

src/Symfony/Component/Serializer/Serializer.php

@@ -237,7 +237,6 @@ private function normalizeObject($object, $format = null, array $context = array
         foreach ($this->normalizers as $normalizer) {
             if ($normalizer instanceof NormalizerInterface
                 && $normalizer->supportsNormalization($object, $format)) {
-                $this->normalizerCache[$class][$format] = $normalizer;
 
                 return $normalizer->normalize($object, $format, $context);
             }
@@ -272,7 +271,6 @@ private function denormalizeObject($data, $class, $format = null, array $context
         foreach ($this->normalizers as $normalizer) {
             if ($normalizer instanceof DenormalizerInterface
                 && $normalizer->supportsDenormalization($data, $class, $format)) {
-                $this->denormalizerCache[$class][$format] = $normalizer;
 
                 return $normalizer->denormalize($data, $class, $format, $context);
             }

src/Symfony/Component/Serializer/Tests/SerializerTest.php

@@ -73,6 +73,50 @@ public function testDenormalizeOnNormalizer()
         $this->assertTrue($this->serializer->denormalize(json_encode($data), 'stdClass', 'json'));
     }
 
+    public function testNormalizeWithSupportOnData()
+    {
+        $normalizer1 = $this->getMock('Symfony\Component\Serializer\Normalizer\NormalizerInterface');
+        $normalizer1->method('supportsNormalization')
+            ->willReturnCallback(function ($data, $format) {
+                return isset($data->test);
+            });
+        $normalizer1->method('normalize')->willReturn('test1');
+
+        $normalizer2 = $this->getMock('Symfony\Component\Serializer\Normalizer\NormalizerInterface');
+        $normalizer2->method('supportsNormalization')
+            ->willReturn(true);
+        $normalizer2->method('normalize')->willReturn('test2');
+
+        $serializer = new Serializer(array($normalizer1, $normalizer2));
+
+        $data = new \stdClass();
+        $data->test = true;
+        $this->assertEquals('test1', $serializer->normalize($data));
+
+        $this->assertEquals('test2', $serializer->normalize(new \stdClass()));
+    }
+
+    public function testDenormalizeWithSupportOnData()
+    {
+        $denormalizer1 = $this->getMock('Symfony\Component\Serializer\Normalizer\DenormalizerInterface');
+        $denormalizer1->method('supportsDenormalization')
+            ->willReturnCallback(function ($data, $type, $format) {
+                return isset($data['test1']);
+            });
+        $denormalizer1->method('denormalize')->willReturn('test1');
+
+        $denormalizer2 = $this->getMock('Symfony\Component\Serializer\Normalizer\DenormalizerInterface');
+        $denormalizer2->method('supportsDenormalization')
+            ->willReturn(true);
+        $denormalizer2->method('denormalize')->willReturn('test2');
+
+        $serializer = new Serializer(array($denormalizer1, $denormalizer2));
+
+        $this->assertEquals('test1', $serializer->denormalize(array('test1' => true), 'test'));
+
+        $this->assertEquals('test2', $serializer->denormalize(array(), 'test'));
+    }
+
     public function testSerialize()
     {
         $this->serializer = new Serializer(array(new GetSetMethodNormalizer()), array('json' => new JsonEncoder()));