Symfony Validation / Caching using Predis and CacheBundle (PSR-6).

AppKernel.php

<?php

use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\Config\Loader\LoaderInterface;

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(),
            
            // AdapterBubndle & CacheBundle
            new Cache\AdapterBundle\CacheAdapterBundle(),
            new Cache\CacheBundle\CacheBundle(),
            
            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;
    }

    public function getRootDir()
    {
        return __DIR__;
    }

    public function getCacheDir()
    {
        return dirname(__DIR__).'/var/cache/'.$this->getEnvironment();
    }

    public function getLogDir()
    {
        return dirname(__DIR__).'/var/logs';
    }

    public function registerContainerConfiguration(LoaderInterface $loader)
    {
        $loader->load($this->getRootDir().'/config/config_'.$this->getEnvironment().'.yml');
    }
}

config.yml

framework:
    validation:      { enable_annotations: true, cache: 'cache.service.validation' }
    
# -------------------------------------------------------------
# CacheBundle Configuration.
# see: http://www.php-cache.com/en/latest/symfony/cache-bundle/
# -------------------------------------------------------------
#
# Packages to download.
# $ composer predis/predis cache/adapter-bundle cache/cache-bundle cache/predis-adapter
#
# Create Predis Adapter.
# /** @var CacheItemPoolInterface $pool */
# $pool = $this->container->get('cache.provider.predis_adapter');
# or
# $pool = $this->container->get('alias.predis_adapter');
# or (the first configured adapter or a adapter named default will be aliased to service id cache).
# $cache = $this->container->get('cache');
# -------------------------------------------------------------
cache_adapter:
    providers:
        predis_adapter:
            factory: 'cache.factory.predis'
            options:
                pool_namespace: '%validator.mapping.cache.prefix%'
            aliases: ['alias.predis_adapter']

# To use a PSR-6 cache for the validation, use the following configuration.
cache:
    validation:
        enabled: true
        service_id: 'cache.provider.predis_adapter'
        use_tagging: true