[symfony-users] Event Dispatcher connects twice the same function to same event when using own events in task

[Bogumil Wrona]

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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