TransientMemoryBackend.php

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

class TransientMemoryBackend extends \TYPO3\CMS\Core\Cache\Backend\AbstractBackend implements \TYPO3\CMS\Core\Cache\Backend\TaggableBackendInterface {

    protected $entries = array();

    protected $tagsAndEntries = array();

    public function set($entryIdentifier, $data, array $tags = array(), $lifetime = NULL) {
        if (!$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);
        }
        if (!is_string($data)) {
            throw new \TYPO3\CMS\Core\Cache\Exception\InvalidDataException('The specified data is of type "' . gettype($data) . '" but a string is expected.', 1238244993);
        }
        $this->entries[$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 array();
        }
    }

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

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

    public function collectGarbage() {

    }

}