Hi all,
I am using lots of tasks and they are parts of plugins.
I would like to expand functionality of them using Observer pattern -> Events.
Problem is that:
When I run the task number of listeners is doubled so each function is running
twice!
example:
-------------------
| myMajorPlugin |
-------------------
// myMajorPlugin/config/myMajorPluginConfiguration.class.php:
class myMajorPluginConfiguration extends sfPluginConfiguration
{
public function initialize()
{
$this->dispatcher->connect('task.import.finish', array('myMajorListener',
'listenToTaskImportFinishEvent'));
}
}
// myMajorPlugin/lib/listener/myMajorListener.class.php:
class myMajorListener
{
static public $num = 0;
static public function listenToTaskImportFinishEvent(sfEvent $event)
{
// action 1
echo "\nMajor: " . ++self::$num . "\n";
}
}
// myMajorPlugin/lib/task/productItemimportTask.class.php:
//[...]
protected function execute($arguments = array(), $options = array())
{
// some action
$this->dispatcher->notify(new sfEvent($this, 'task.import.finish'));
}
-----------------------
| myExtensionPlugin |
-----------------------
// myExtensionPlugin/config/myExtensionPluginConfiguration.class.php:
class myExtensionPluginConfiguration extends sfPluginConfiguration
{
public function initialize()
{
$this->dispatcher->connect('task.import.finish',
array('myExtensionListener', 'listenToTaskImportFinishEvent'));
}
}
// myExtensionPlugin/lib/listener/myExtensionListener.class.php:
class myExtensionListener
{
static public $num = 0;
static public function listenToTaskImportFinishEvent(sfEvent $event)
{
// action 2
echo "\nExtension: " . ++self::$num . "\n";
}
}
Now when I run task: > ./symfony product:item-import
it is displaying:
> Major: 1
> Extension: 1
> Major: 2
> Extension: 2
It shows that each function runs twice but should only once.
In addition if I put code from above to task's execute() function:
print_r($this->dispatcher->getListeners('task.import.finish');
Now when I run task I see:
Array
(
[0] => Array
(
[0] => myMajorListener
[1] => listenToTaskImportFinishEvent
)
[1] => Array
(
[0] => myExtensionListener
[1] => listenToTaskImportFinishEvent
)
[2] => Array
(
[0] => myMajorListener
[1] => listenToTaskImportFinishEvent
)
[3] => Array
(
[0] => myExtensionListener
[1] => listenToTaskImportFinishEvent
)
)
I did a research and found that problem is not new:
1. http://trac.symfony-project.org/ticket/7948
2.
http://groups.google.com/group/symfony-users/browse_thread/thread/e7a27d65e4436692/fd59ac0bdbc56ae1?hl=en&lnk=gst&q=Event+Dispatcher+connect+twice+times+same+function+to+same+event#fd59ac0bdbc56ae1
Examples are not showing situation when you are using own events but only built
into symfony like here:
http://www.symfony-project.org/jobeet/1_4/Propel/en/20#chapter_20_sub_the_user
Little help please
Thanks,
Bogumil
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