/**
     * Called on activation of the plugin.
     */
    public function installPlugin()
    {
        global $wpdb;
        // Add Cron Job, the action is added in the Public class.
        if (!wp_next_scheduled('avhfdas_clean_nonce')) {
            wp_schedule_event(time(), 'daily', 'avhfdas_clean_nonce');
        }
        // Setup nonces db in options
        if (!get_option($this->_core->getDbNonces())) {
            update_option($this->_core->getDbNonces(), $this->_core->getDefaultNonces());
            wp_cache_flush();
            // Delete cache
        }
        // Setup the DB Tables
        $charset_collate = '';
        if (version_compare($wpdb->db_version(), '4.1.0', '>=')) {
            if (!empty($wpdb->charset)) {
                $charset_collate = 'DEFAULT CHARACTER SET ' . $wpdb->charset;
            }
            if (!empty($wpdb->collate)) {
                $charset_collate .= ' COLLATE ' . $wpdb->collate;
            }
        }
        if ($wpdb->get_var('show tables like \'' . $wpdb->avhfdasipcache . '\'') === null) {
            $sql = 'CREATE TABLE `' . $wpdb->avhfdasipcache . '` (
  					`ip` int(10) unsigned NOT null,
  					`added` datetime NOT null DEFAULT \'0000-00-00 00:00:00\',
  					`lastseen` datetime NOT null DEFAULT \'0000-00-00 00:00:00\',
  					`spam` tinyint(1) NOT null,
  					PRIMARY KEY (`ip`),
  					KEY `added` (`added`),
  					KEY `lastseen` (`lastseen`)
					) ' . $charset_collate . ';';
            $wpdb->query($sql);
        }
    }