[ObjectMapper] dump mapping code

[soyuka]

Q	A
Branch?	7.4
Bug fix?	no
New feature?	yes
Deprecations?	no
Issues	n/a
License	MIT

needs #61497

(code-gen ✗)❯ /home/linuxbrew/.linuxbrew/Cellar/php/8.4.11/bin/php ./vendor/bin/phpbench run
PHPBench (84.x-dev) running benchmarks... #standwithukraine
with configuration file: /home/soyuka/forks/symfony/src/Symfony/Component/ObjectMapper/phpbench.json
with PHP version 8.4.11, xdebug ✔, opcache ❌

\Symfony\Component\ObjectMapper\Benchmarks\ObjectMapperBench

    benchObjectMapper.......................I4 - Mo268.351μs (±0.86%)
    benchCachedObjectMapper.................I4 - Mo134.417μs (±0.41%)

Subjects: 2, Assertions: 0, Failures: 0, Errors: 0

Benchmark code

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\ObjectMapper\Benchmarks;

use PhpBench\Attributes as Bench;
use Symfony\Component\ObjectMapper\CachedObjectMapper;
use Symfony\Component\ObjectMapper\ObjectMapper;
use Symfony\Component\ObjectMapper\Tests\Fixtures\A;
use Symfony\Component\ObjectMapper\Tests\Fixtures\C;
use Symfony\Component\ObjectMapper\Tests\Fixtures\D;

#[Bench\BeforeMethods('setUp')]
class ObjectMapperBench
{
    private ObjectMapper $objectMapper;
    private CachedObjectMapper $cachedObjectMapper;
    private A $sourceObject;
    private string $cacheDir;

    public function setUp(): void
    {
        $this->objectMapper = new ObjectMapper();
        $this->cacheDir = sys_get_temp_dir() . '/symfony_object_mapper_bench_' . uniqid();
        $this->cachedObjectMapper = new CachedObjectMapper($this->cacheDir);

        $d = new D(baz: 'foo', bat: 'bar');
        $c = new C(foo: 'foo', bar: 'bar');
        $this->sourceObject = new A();
        $this->sourceObject->foo = 'test';
        $this->sourceObject->transform = 'test';
        $this->sourceObject->baz = 'me';
        $this->sourceObject->notinb = 'test';
        $this->sourceObject->relation = $c;
        $this->sourceObject->relationNotMapped = $d;
    }

    public function tearDown(): void
    {
        if (is_dir($this->cacheDir)) {
            array_map('unlink', glob($this->cacheDir . '/*'));
            rmdir($this->cacheDir);
        }
    }

    #[Bench\Revs(100)]
    #[Bench\Iterations(5)]
    public function benchObjectMapper(): void
    {
        $this->objectMapper->map($this->sourceObject);
    }

    #[Bench\Warmup(1)]
    #[Bench\Revs(100)]
    #[Bench\Iterations(5)]
    public function benchCachedObjectMapper(): void
    {
        $this->cachedObjectMapper->map($this->sourceObject);
    }
}

[fabpot]

#61497 has been merged now.

[mtarld]

@soyuka maybe you can leverage the Filesystem component like it has been done in the JsonStreamer?

[nicolas-grekas]

Here are some comments.
I'd be great to have a few fixtures of generated files.
Next steps are cache warmups (#61528 could be used for inspiration)
and FrameworkBundle integration of course.
Up to continue that way?

[nicolas-grekas]

Thanks, here are some minor stuff, LGTM after that!

[nicolas-grekas]

do we really need this helper? why not doing this instead? what's special about string callables?
$fn($value, $source, $target)

[soyuka]

because we'll give $source and $target to a function that probably do not handle that (ucfirst for example). Maybe it was not a good idea to support native php functions afterall and we should only supports callables?

[soyuka]

@nicolas-grekas I extracted the part dumping code to another class in Internal, it was better for the cache warmer. I resolved the previous points, some code has just moved to the generator. As it has a direct impact on the CachedObjectMapper implementation I merged the cache warmer into this PR.