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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_EventManager
* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
require_once 'Zend/EventManager/EventManager.php';
require_once 'Zend/EventManager/SharedEventCollection.php';
/**
* Shared/contextual EventManager
*
* Allows attaching to EMs composed by other classes without having an instance first.
* The assumption is that the SharedEventManager will be injected into EventManager
* instances, and then queried for additional listeners when triggering an event.
*
* @category Zend
* @package Zend_EventManager
* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_EventManager_SharedEventManager implements Zend_EventManager_SharedEventCollection
{
/**
* Identifiers with event connections
* @var array
*/
protected $identifiers = array();
/**
* Attach a listener to an event
*
* Allows attaching a callback to an event offerred by one or more
* identifying components. As an example, the following connects to the
* "getAll" event of both an AbstractResource and EntityResource:
*
* <code>
* SharedEventManager::getInstance()->connect(
* array('My\Resource\AbstractResource', 'My\Resource\EntityResource'),
* 'getOne',
* function ($e) use ($cache) {
* if (!$id = $e->getParam('id', false)) {
* return;
* }
* if (!$data = $cache->load(get_class($resource) . '::getOne::' . $id )) {
* return;
* }
* return $data;
* }
* );
* </code>
*
* @param string|array $id Identifier(s) for event emitting component(s)
* @param string $event
* @param callback $callback PHP Callback
* @param int $priority Priority at which listener should execute
* @return void
*/
public function attach($id, $event, $callback, $priority = 1)
{
$ids = (array) $id;
foreach ($ids as $id) {
if (!array_key_exists($id, $this->identifiers)) {
$this->identifiers[$id] = new Zend_EventManager_EventManager();
}
$this->identifiers[$id]->attach($event, $callback, $priority);
}
}
/**
* Detach a listener from an event offered by a given resource
*
* @param string|int $id
* @param Zend_Stdlib_CallbackHandler $listener
* @return bool Returns true if event and listener found, and unsubscribed; returns false if either event or listener not found
*/
public function detach($id, Zend_Stdlib_CallbackHandler $listener)
{
if (!array_key_exists($id, $this->identifiers)) {
return false;
}
return $this->identifiers[$id]->detach($listener);
}
/**
* Retrieve all registered events for a given resource
*
* @param string|int $id
* @return array
*/
public function getEvents($id)
{
if (!array_key_exists($id, $this->identifiers)) {
return false;
}
return $this->identifiers[$id]->getEvents();
}
/**
* Retrieve all listeners for a given identifier and event
*
* @param string|int $id
* @param string|int $event
* @return false|Zend_Stdlib_PriorityQueue
*/
public function getListeners($id, $event)
{
if (!array_key_exists($id, $this->identifiers)) {
return false;
}
return $this->identifiers[$id]->getListeners($event);
}
/**
* Clear all listeners for a given identifier, optionally for a specific event
*
* @param string|int $id
* @param null|string $event
* @return bool
*/
public function clearListeners($id, $event = null)
{
if (!array_key_exists($id, $this->identifiers)) {
return false;
}
if (null === $event) {
unset($this->identifiers[$id]);
return true;
}
return $this->identifiers[$id]->clearListeners($event);
}
}
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