TransientMemoryBackend.php

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

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class TransientMemoryBackend extends \TYPO3\CMS\Core\Cache\Backend\AbstractBackend implements TaggableBackendInterface, TransientBackendInterface
{
    protected $entries = [];

    protected $tagsAndEntries = [];

    public function set($entryIdentifier, $data, array $tags = [], $lifetime = null)
    {
        if (!$this->cache instanceof \TYPO3\CMS\Core\Cache\Frontend\FrontendInterface) {
            throw new \TYPO3\CMS\Core\Cache\Exception('No cache frontend has been set yet via setCache().', 1238244992);
        }
        $this->entries[$entryIdentifier] = $data;
        foreach ($tags as $tag) {
            $this->tagsAndEntries[$tag][$entryIdentifier] = true;
        }
    }

    public function get($entryIdentifier)
    {
        return isset($this->entries[$entryIdentifier]) ? $this->entries[$entryIdentifier] : false;
    }

    public function has($entryIdentifier)
    {
        return isset($this->entries[$entryIdentifier]);
    }

    public function remove($entryIdentifier)
    {
        if (isset($this->entries[$entryIdentifier])) {
            unset($this->entries[$entryIdentifier]);
            foreach ($this->tagsAndEntries as $tag => $_) {
                if (isset($this->tagsAndEntries[$tag][$entryIdentifier])) {
                    unset($this->tagsAndEntries[$tag][$entryIdentifier]);
                }
            }
            return true;
        } else {
            return false;
        }
    }

    public function findIdentifiersByTag($tag)
    {
        if (isset($this->tagsAndEntries[$tag])) {
            return array_keys($this->tagsAndEntries[$tag]);
        } else {
            return [];
        }
    }

    public function flush()
    {
        $this->entries = [];
        $this->tagsAndEntries = [];
    }

    public function flushByTag($tag)
    {
        $identifiers = $this->findIdentifiersByTag($tag);
        foreach ($identifiers as $identifier) {
            $this->remove($identifier);
        }
    }

    public function collectGarbage()
    {
    }
}