How does `Magento\Framework\App\Cache\Frontend\Pool::_getCacheSettings()` work?

dmitry_fedyuk · March 13, 2024, 4:16pm

1. Magento\Framework\App\Cache\Frontend\Pool::_getCacheSettings()

magento/magento2/blob/2.4.7-beta3/lib/internal/Magento/Framework/App/Cache/Frontend/Pool.php#L74-L93


      
          /**
           * Retrieve settings for all cache front-ends known to the system
           *
           * @return array Format: array('<frontend_id>' => array(<cache_settings>), ...)
           */
          protected function _getCacheSettings()
          {
              /*
               * Merging is intentionally implemented through array_replace_recursive() instead of array_merge(), because even
               * though some settings may become irrelevant when the cache storage type is changed, they don't do any harm
               * and can be overwritten when needed.
               * Also array_merge leads to unexpected behavior, for for example by dropping the
               * default cache_dir setting from di.xml when a cache id_prefix is configured in app/etc/env.php.
               */
              $cacheInfo = $this->deploymentConfig->getConfigData(FrontendPool::KEY_CACHE);
              if (null !== $cacheInfo && array_key_exists(FrontendPool::KEY_FRONTEND_CACHE, $cacheInfo)) {
                  return array_replace_recursive($this->_frontendSettings, $cacheInfo[FrontendPool::KEY_FRONTEND_CACHE]);
              }
              return $this->_frontendSettings;
          }

1.1. Magento\Framework\App\Cache\Type\FrontendPool::KEY_CACHE

github.com

magento/magento2/blob/2.4.7-beta3/lib/internal/Magento/Framework/App/Cache/Type/FrontendPool.php#L29-L32


      
          /**
           * Config key for cache
           */
          const KEY_CACHE = 'cache';

2. Magento\Framework\App\DeploymentConfig::getConfigData() (Magento < 2.4.6)

github.com

magento/magento2/blob/2.4.5/lib/internal/Magento/Framework/App/DeploymentConfig.php#L104-L121


      
          /**
           * Gets a value specified key from config data
           *
           * @param string $key
           * @return null|mixed
           * @throws FileSystemException
           * @throws RuntimeException
           */
          public function getConfigData($key = null)
          {
              $this->load();
          
              if ($key !== null && !isset($this->data[$key])) {
                  return null;
              }
          
              return $this->data[$key] ?? $this->data;
          }

2.1

2024-03-13--19-27-58