[geeklog-devel] GL2 event model

[Tom Willett]

Let me get this straight.

GL2 Core would make the MySubjectObserverClass

$obs = new MySubjectObserverClass;

then the plugin would register by somehow getting the reference to the 
MySubjectOvserverClass and register itself as a listener

$obs->addListner($MyPlugin);
or
$obs->addListener($MyPlugin, $events);
etc

Then when a event happened GL2 Core or a plugin could notify the plugins

$obs->notifyAll($event)

Do I have this about right?

--
Tom Willett
tomw at pigstye.net

---------- Original Message -----------
From: Tony Bibbs <tony at tonybibbs.com>
To: geeklog-devel at lists.geeklog.net
Sent: Wed, 21 Jul 2004 16:31:57 -0500
Subject: [geeklog-devel] GL2 event model


> The plugin API for GL2 that Vinny has drafted if surprisingly small 

> because we are introducing an event based model.  Essentially, the GL2 

> and all plugins have the option to register events that others can 

> listen to.  To implement this I recommend an observer/observable design 

> pattern similar to the example below.  A few things that need 

> discussion.  First, the example below allows listening only at the 

> object level.  The alternative is the force listening at the event level 

> (in otherwords, addListener would take as a second arg an array of 

> events the object listens to).  Any preference?  General questions?:

> 

> class MySubjectObserverClass {

>    private $listeners = array();

>    private $listernerNextID  =  0;

> 

>    // Alternative names: register, subscribe...

>    public function addListerner(&$obj)

>    {

>        $this->_listerners[] =& $obj;

>       return $this->listernerNextID++;

>    }

> 

>    // Alternative name: unregister, unsubscribe...

>    public function removeListerner($id,'even't)

>    {

>         unset($this->listerners[$id]);

>    }

> 

>    // Alternative name: broadcast...

>    public function notifyAll($event)

>    {

>        foreach ($this->listerners as $id => $obj)

>        {

>            $this->listerners[$id]->notify($event, $this);

>        }

>    }

> 

>    // Alternative name: listen...

>    function notify($event, &$obj)

>    {

>         switch (get_class($obj)) {

>             case 'blah':

>                ...

>        }

>    }

> }

> 

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------- End of Original Message -------