Symfony Validation / Caching ClassMetadata information using Predis and DoctrineCacheBundle.

AppKernel.php

<?php
class AppKernel extends Kernel
{
    public function registerBundles()
    {
        $bundles = [
            new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
            new Symfony\Bundle\SecurityBundle\SecurityBundle(),
            new Symfony\Bundle\TwigBundle\TwigBundle(),
            new Symfony\Bundle\MonologBundle\MonologBundle(),
            new Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle(),
            new Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),
            new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),
            new Doctrine\Bundle\DoctrineCacheBundle\DoctrineCacheBundle(),
            new AppBundle\AppBundle(),
        ];

        if (in_array($this->getEnvironment(), ['dev', 'test'], true)) {
            $bundles[] = new Symfony\Bundle\DebugBundle\DebugBundle();
            $bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
            $bundles[] = new Sensio\Bundle\DistributionBundle\SensioDistributionBundle();
            $bundles[] = new Sensio\Bundle\GeneratorBundle\SensioGeneratorBundle();
        }

        return $bundles;
    }

}

config.yml

framework:
    validation:      { enable_annotations: true, cache: validator.mapping.cache.doctrine.predis_cache }



# $ composer require doctrine/doctrine-cache-bundle
# $ composer predis/predis
doctrine_cache:
    aliases:
        predis_cache: my_predis_cache

    providers: 
        my_predis_cache:
            type: predis
            namespace: "%validator.mapping.cache.prefix%"
            aliases:
                - predis_cache

services.yml

services:

    validator.mapping.cache.doctrine.predis_cache:
        class: Symfony\Component\Validator\Mapping\Cache\DoctrineCache
        public: false
        arguments: ["@predis_cache"]