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egroupware_official/phpgwapi/inc/class.egw_json_push.inc.php

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<?php
/**
* EGroupware API: push JSON commands to client
*
* @link http://www.egroupware.org
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package api
* @subpackage ajax
* @author Ralf Becker <rb@stylite.de>
* @version $Id$
*/
/**
* Class to push JSON commands to client
*/
class egw_json_push extends egw_json_msg
{
/**
* Available backends to try
*
* @var array
*/
protected static $backends = array(
'notifications_push',
);
/**
* Backend to use
*
* @var egw_json_push_backend
*/
protected static $backend;
/**
* account_id we are pushing too
*
* @var int
*/
protected $account_id;
/**
*
* @param int $account_id account_id of user to push to
*/
public function __construct($account_id)
{
$this->account_id = $account_id;
}
/**
* Adds any type of data to the message
*
* @param string $key
* @param mixed $data
* @throws egw_json_push_exception_not_online if $account_id is not online
*/
protected function addGeneric($key, $data)
{
if (!isset(self::$backend))
{
foreach(self::$backends as $class)
{
if (class_exists($class))
{
try {
self::$backend = new $class;
break;
}
catch (Exception $e) {
// ignore exception
unset($e, self::$backend);
}
}
}
if (!isset(self::$backend))
{
throw new egw_json_push_exception_not_online('No valid push-backend found!');
}
}
self::$backend->addGeneric($this->account_id, $key, $data);
}
}
/**
* Interface for push backends
*/
interface egw_json_push_backend
{
/**
* Adds any type of data to the message
*
* @param int $account_id account_id to push message too
* @param string $key
* @param mixed $data
* @throws egw_json_push_exception_not_online if $account_id is not online
*/
public function addGeneric($account_id, $key, $data);
}
/**
* Exception thrown, if message can not be pushed
*/
class egw_json_push_exception_not_online extends egw_exception_not_found
{
}