Registry.php

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<?php
namespace TYPO3\CMS\Core;

class Registry implements \TYPO3\CMS\Core\SingletonInterface {

    protected $entries = array();

    protected $loadedNamespaces = array();

    public function get($namespace, $key, $defaultValue = NULL) {
        $this->validateNamespace($namespace);
        if (!$this->isNamespaceLoaded($namespace)) {
            $this->loadEntriesByNamespace($namespace);
        }
        return isset($this->entries[$namespace][$key]) ? $this->entries[$namespace][$key] : $defaultValue;
    }

    public function set($namespace, $key, $value) {
        $this->validateNamespace($namespace);
        if (!$this->isNamespaceLoaded($namespace)) {
            $this->loadEntriesByNamespace($namespace);
        }
        $serializedValue = serialize($value);
        $res = $GLOBALS['TYPO3_DB']->exec_SELECTquery('uid', 'sys_registry', 'entry_namespace = ' . $GLOBALS['TYPO3_DB']->fullQuoteStr($namespace, 'sys_registry') . ' AND entry_key = ' . $GLOBALS['TYPO3_DB']->fullQuoteStr($key, 'sys_registry'));
        if ($GLOBALS['TYPO3_DB']->sql_num_rows($res) < 1) {
            $GLOBALS['TYPO3_DB']->exec_INSERTquery('sys_registry', array(
                'entry_namespace' => $namespace,
                'entry_key' => $key,
                'entry_value' => $serializedValue
            ));
        } else {
            $GLOBALS['TYPO3_DB']->exec_UPDATEquery('sys_registry', 'entry_namespace = ' . $GLOBALS['TYPO3_DB']->fullQuoteStr($namespace, 'sys_registry') . ' AND entry_key = ' . $GLOBALS['TYPO3_DB']->fullQuoteStr($key, 'sys_registry'), array(
                'entry_value' => $serializedValue
            ));
        }
        $this->entries[$namespace][$key] = $value;
    }

    public function remove($namespace, $key) {
        $this->validateNamespace($namespace);
        $GLOBALS['TYPO3_DB']->exec_DELETEquery('sys_registry', 'entry_namespace = ' . $GLOBALS['TYPO3_DB']->fullQuoteStr($namespace, 'sys_registry') . ' AND entry_key = ' . $GLOBALS['TYPO3_DB']->fullQuoteStr($key, 'sys_registry'));
        unset($this->entries[$namespace][$key]);
    }

    public function removeAllByNamespace($namespace) {
        $this->validateNamespace($namespace);
        $GLOBALS['TYPO3_DB']->exec_DELETEquery('sys_registry', 'entry_namespace = ' . $GLOBALS['TYPO3_DB']->fullQuoteStr($namespace, 'sys_registry'));
        unset($this->entries[$namespace]);
    }

    protected function isNamespaceLoaded($namespace) {
        return isset($this->loadedNamespaces[$namespace]);
    }

    protected function loadEntriesByNamespace($namespace) {
        $this->validateNamespace($namespace);
        $storedEntries = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows('*', 'sys_registry', 'entry_namespace = ' . $GLOBALS['TYPO3_DB']->fullQuoteStr($namespace, 'sys_registry'));
        foreach ($storedEntries as $storedEntry) {
            $key = $storedEntry['entry_key'];
            $this->entries[$namespace][$key] = unserialize($storedEntry['entry_value']);
        }
        $this->loadedNamespaces[$namespace] = TRUE;
    }

    protected function validateNamespace($namespace) {
        if (strlen($namespace) < 2) {
            throw new \InvalidArgumentException('Given namespace must be longer than two characters.', 1249755131);
        }
    }

}