getMetadataCacheImpl() public method

Gets the cache driver implementation that is used for metadata caching.
public getMetadataCacheImpl ( ) : Doctrine\Common\Cache\Cache
return Doctrine\Common\Cache\Cache
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 /**
  * Creates a new Document that operates on the given Mongo connection
  * and uses the given Configuration.
  *
  * @param \Doctrine\MongoDB\Connection|null $conn
  * @param Configuration|null $config
  * @param \Doctrine\Common\EventManager|null $eventManager
  */
 protected function __construct(Connection $conn = null, Configuration $config = null, EventManager $eventManager = null)
 {
     $this->config = $config ?: new Configuration();
     $this->eventManager = $eventManager ?: new EventManager();
     $this->connection = $conn ?: new Connection(null, array(), $this->config, $this->eventManager);
     $metadataFactoryClassName = $this->config->getClassMetadataFactoryName();
     $this->metadataFactory = new $metadataFactoryClassName();
     $this->metadataFactory->setDocumentManager($this);
     $this->metadataFactory->setConfiguration($this->config);
     if ($cacheDriver = $this->config->getMetadataCacheImpl()) {
         $this->metadataFactory->setCacheDriver($cacheDriver);
     }
     $hydratorDir = $this->config->getHydratorDir();
     $hydratorNs = $this->config->getHydratorNamespace();
     $this->hydratorFactory = new HydratorFactory($this, $this->eventManager, $hydratorDir, $hydratorNs, $this->config->getAutoGenerateHydratorClasses());
     $this->unitOfWork = new UnitOfWork($this, $this->eventManager, $this->hydratorFactory);
     $this->hydratorFactory->setUnitOfWork($this->unitOfWork);
     $this->schemaManager = new SchemaManager($this, $this->metadataFactory);
     $this->proxyFactory = new ProxyFactory($this, $this->config->getProxyDir(), $this->config->getProxyNamespace(), $this->config->getAutoGenerateProxyClasses());
 }