Feature Request: Prune caches probabilistically at the end of requests

[jack-worman]

Description

I want a subscriber added to the framework bundle that will sometimes prune caches at the end of a request.

You should be able to configure the PROBABILITY_NUMERATOR and PROBABILITY_DENOMINATOR exactly like the session.gc ini settings.

Example

class PruneCachesSubscriber implements EventSubscriberInterface
{
    private const int PROBABILITY_NUMERATOR = 1;
    private const int PROBABILITY_DENOMINATOR = 10_000;

    public function __construct(
        /** @var iterable<PruneableInterface> */
        private readonly iterable $prunableCaches,
    ) {
    }

    public static function getSubscribedEvents(): array
    {
        return [
            TerminateEvent::class => 'pruneCaches',
            ConsoleTerminateEvent::class => 'pruneCaches',
        ];
    }

    public function pruneCaches(): void
    {
        if (\random_int(1, self::PROBABILITY_DENOMINATOR) > self::PROBABILITY_NUMERATOR) {
            return;
        }
        foreach ($this->prunableCaches as $prunableCache) {
            $prunableCache->prune();
        }
    }
}