AbstractFrontend.php

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<?php
namespace TYPO3\CMS\Core\Cache\Frontend;

abstract class AbstractFrontend implements \TYPO3\CMS\Core\Cache\Frontend\FrontendInterface {

    protected $identifier;

    protected $backend;

    public function __construct($identifier, \TYPO3\CMS\Core\Cache\Backend\BackendInterface $backend) {
        if (preg_match(self::PATTERN_ENTRYIDENTIFIER, $identifier) !== 1) {
            throw new \InvalidArgumentException('"' . $identifier . '" is not a valid cache identifier.', 1203584729);
        }
        $this->identifier = $identifier;
        $this->backend = $backend;
        $this->backend->setCache($this);
    }

    public function getIdentifier() {
        return $this->identifier;
    }

    public function getBackend() {
        return $this->backend;
    }

    public function has($entryIdentifier) {
        if (!$this->isValidEntryIdentifier($entryIdentifier)) {
            throw new \InvalidArgumentException('"' . $entryIdentifier . '" is not a valid cache entry identifier.', 1233058486);
        }
        return $this->backend->has($entryIdentifier);
    }

    public function remove($entryIdentifier) {
        if (!$this->isValidEntryIdentifier($entryIdentifier)) {
            throw new \InvalidArgumentException('"' . $entryIdentifier . '" is not a valid cache entry identifier.', 1233058495);
        }
        return $this->backend->remove($entryIdentifier);
    }

    public function flush() {
        $this->backend->flush();
    }

    public function flushByTag($tag) {
        if (!$this->isValidTag($tag)) {
            throw new \InvalidArgumentException('"' . $tag . '" is not a valid tag for a cache entry.', 1233057359);
        }
        if (is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/cache/frontend/class.t3lib_cache_frontend_abstractfrontend.php']['flushByTag'])) {
            foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/cache/frontend/class.t3lib_cache_frontend_abstractfrontend.php']['flushByTag'] as $_funcRef) {
                $params = array('tag' => $tag);
                \TYPO3\CMS\Core\Utility\GeneralUtility::callUserFunction($_funcRef, $params, $this);
            }
        }
        if ($this->backend instanceof \TYPO3\CMS\Core\Cache\Backend\TaggableBackendInterface) {
            $this->backend->flushByTag($tag);
        }
    }

    public function collectGarbage() {
        $this->backend->collectGarbage();
    }

    public function isValidEntryIdentifier($identifier) {
        return preg_match(self::PATTERN_ENTRYIDENTIFIER, $identifier) === 1;
    }

    public function isValidTag($tag) {
        return preg_match(self::PATTERN_TAG, $tag) === 1;
    }

}