function ChainedFastBackendFactory::__construct

Constructs ChainedFastBackendFactory object.

Parameters

\Drupal\Core\Site\Settings|null $settings: (optional) The settings object.

string|null $consistent_service_name: (optional) The service name of the consistent backend factory. Defaults to:

• $settings->get('cache')['default'] (if specified)
• 'cache.backend.database' (if the above isn't specified)

string|null $fast_service_name: (optional) The service name of the fast backend factory. Defaults to:

• 'cache.backend.apcu' (if the PHP process has APCu enabled)
• NULL (if the PHP process doesn't have APCu enabled)

File

core/lib/Drupal/Core/Cache/ChainedFastBackendFactory.php, line 47

Class

ChainedFastBackendFactory

Defines the chained fast cache backend factory.

Namespace

Code

public function __construct(Settings $settings = NULL, $consistent_service_name = NULL, $fast_service_name = NULL) {
    // Default the consistent backend to the site's default backend.
    if (!isset($consistent_service_name)) {
        $cache_settings = isset($settings) ? $settings->get('cache') : [];
        $consistent_service_name = isset($cache_settings['default']) ? $cache_settings['default'] : 'cache.backend.database';
    }
    // Default the fast backend to APCu if it's available.
    if (!isset($fast_service_name) && function_exists('apcu_fetch')) {
        $fast_service_name = 'cache.backend.apcu';
    }
    $this->consistentServiceName = $consistent_service_name;
    // Do not use the fast chained backend during installation. In those cases,
    // we expect many cache invalidations and writes, the fast chained cache
    // backend performs badly in such a scenario.
    if (!InstallerKernel::installationAttempted()) {
        $this->fastServiceName = $fast_service_name;
    }
}