…ault) This PR was squashed before being merged into the 5.2-dev branch. Discussion ---------- [Serializer] Add CompiledClassMetadataFactory | Q | A | ------------- | --- | Branch? | master | Bug fix? | no | New feature? | yes | BC breaks? | no | Deprecations? | no | Tests pass? | yes | Fixed tickets | ? | License | MIT | Doc PR | todo (issue: symfony/symfony-docs#10706) This introduce a dumped `ClassMetadataFactoryInterface` implementation to speed up the serializer by leveraging [PHP7 immutable array](https://blog.blackfire.io/php-7-performance-improvements-immutable-arrays.html). Like for #28865, if the user have the opcache extension enabled, the compilation time will be skipped. The user will also have a performance boost when not using opcache as we are no longer fetching `ClassMetadata` from the PSR-6 cache. This allow to speed up the normalization (without opcache) by 9-12% depending on how many objects are involved in the graph: - [SymfonyObjectNormalizerBenchmark, 100 iterations with complexity of 1](https://blackfire.io/profiles/compare/d937a9cc-eebf-47eb-be90-c8e65cdf12b3/graph) - [SymfonyObjectNormalizerBenchmark, 3 iterations with complexity of 60](https://blackfire.io/profiles/compare/d490542c-9a79-48a0-b7bc-1ed3ca6a9148/graph) On the `FrameworkBundle` side, I suggest to add a `CacheWarmer` to dump the metadata array from configured class list. The list could have a _good_ default which will load the classes found in `src/Entity`. ## Dumping the `ClassMetadata` ```php $classMetadatas = []; foreach([Category::class, Comment::class, Forum::class, Thread::class, User::class] as $class) { $classMetadatas[] = $this->classMetadataFactory->getMetadataFor($class); } file_put_contents('dumped.php', $this->classMetadataFactoryCompiler->compile($classMetadatas)); ``` ## Using the dumped `ClassMetadata` ```php $classMetadataFactory = new CompiledClassMetadataFactory( 'dumped.php', new CacheClassMetadataFactory( new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader())), new ApcuAdapter('SymfonyMetadata') ) ); ``` # To do - [x] Tests. - [x] Cache warmer. - [x] Documentation. - [x] Changelog entry. Commits ------- 63cbf0a [Serializer] Add CompiledClassMetadataFactory

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[Serializer] Document CompiledClassMetadataFactory #10706

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