Your IP : 216.73.216.220
<?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;
/**
* A caching backend which stores cache entries during one script run.
*/
class TransientMemoryBackend extends AbstractBackend implements TaggableBackendInterface, TransientBackendInterface
{
/**
* @var array
*/
protected $entries = [];
/**
* @var array
*/
protected $tagsAndEntries = [];
/**
* Saves data in the cache.
*
* @param string $entryIdentifier An identifier for this specific cache entry
* @param string $data The data to be stored
* @param array $tags Tags to associate with this cache entry
* @param int $lifetime Lifetime of this cache entry in seconds. If NULL is specified, the default lifetime is used. "0" means unlimited lifetime.
* @throws Exception if no cache frontend has been set.
*/
public function set($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;
}
}
/**
* Loads data from the cache.
*
* @param string $entryIdentifier An identifier which describes the cache entry to load
* @return mixed The cache entry's content as a string or FALSE if the cache entry could not be loaded
*/
public function get($entryIdentifier)
{
return $this->entries[$entryIdentifier] ?? false;
}
/**
* Checks if a cache entry with the specified identifier exists.
*
* @param string $entryIdentifier An identifier specifying the cache entry
* @return bool TRUE if such an entry exists, FALSE if not
*/
public function has($entryIdentifier)
{
return isset($this->entries[$entryIdentifier]);
}
/**
* Removes all cache entries matching the specified identifier.
*
* @param string $entryIdentifier Specifies the cache entry to remove
* @return bool TRUE if the entry could be removed or FALSE if no entry was found
*/
public function remove($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;
}
/**
* Finds and returns all cache entry identifiers which are tagged by the
* specified tag.
*
* @param string $tag The tag to search for
* @return array An array with identifiers of all matching entries. An empty array if no entries matched
*/
public function findIdentifiersByTag($tag)
{
if (isset($this->tagsAndEntries[$tag])) {
return array_keys($this->tagsAndEntries[$tag]);
}
return [];
}
/**
* Removes all cache entries of this cache.
*/
public function flush()
{
$this->entries = [];
$this->tagsAndEntries = [];
}
/**
* Removes all cache entries of this cache which are tagged by the specified tag.
*
* @param string $tag The tag the entries must have
*/
public function flushByTag($tag)
{
$identifiers = $this->findIdentifiersByTag($tag);
foreach ($identifiers as $identifier) {
$this->remove($identifier);
}
}
/**
* Does nothing
*/
public function collectGarbage() {}
}