<?php
class Vtiger_Cache_Connector {
    private static $instance = null;
    private $cache = [];

    private function __construct() {}

    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function get($ns, $key) {
        return isset($this->cache[$ns][$key]) ? $this->cache[$ns][$key] : false;
    }

    public function set($ns, $key, $value) {
        if (!isset($this->cache[$ns])) {
            $this->cache[$ns] = [];
        }
        $this->cache[$ns][$key] = $value;
    }

    public function delete($ns, $key) {
        if (isset($this->cache[$ns][$key])) {
            unset($this->cache[$ns][$key]);
        }
    }

    public function flush() {
        $this->cache = [];
    }
}
?>