TransientMemoryBackend.php

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<?php
 
/*
 * 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!
 */
 
namespace ‪TYPO3\CMS\Core\Cache\Backend;
 
use ‪TYPO3\CMS\Core\Cache\Exception;
use ‪TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
 
class ‪TransientMemoryBackend extends ‪AbstractBackend implements ‪TaggableBackendInterface, ‪TransientBackendInterface
{
    protected ‪$entries = [];
 
    protected ‪$tagsAndEntries = [];
 
    public function set($entryIdentifier, $data, array $tags = [], $lifetime = null)
    {
        if (!$this->cache instanceof ‪FrontendInterface) {
            throw new ‪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 $this->entries[$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;
        }
        return false;
    }
 
    public function ‪findIdentifiersByTag($tag)
    {
        if (isset($this->tagsAndEntries[$tag])) {
            return array_keys($this->tagsAndEntries[$tag]);
        }
        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() {}
}