[Laszlo-dev] Fwd: [JIRA] Created: (LPP-4632) Dataset doesn't send oninit event

[P T Withington]

It would make sense to me that a static dataset would send an  
'ondata' event at startup.  It seems like a reasonable thing to expect.

But.  I bet that is going to raise the issue of what should happen if  
someone sends an event and no one is listening.  It is easy for me to  
imagine that a static dataset might send this event before the  
relevant listeners have been initialized sufficiently to be listening.

We might have to implement a 'wakeup-waiting' state in events.  And  
that is sure to break some things.

We seem to have some events that really depend on event counts being  
accurate, and other events that just need to know whether or not an  
event happened.  I don't think our event API necessarily guarantees  
accurate counts...

On 2007-09-02, at 21:54 EDT, Henry Minsky wrote:

> [I wanted to bring this to the whole team for discussion/consensus]
>
>
> You bring up an issue that I've wondered about for a while; should a
> dataset always send an ondata event in every case?
>
>  Currently, 'static' datasets (i.e. datasets with
> compile-time-specified literal data) do not
> send ondata events when they are initialized. I preserved this
> behavior  in LPS 4 from previous versions of LPS, but I was never sure
> if that was the right semantics.
>
> In the example you give, your dataset is 'static', i.e., it is not an
> HTTP request or other dynamic loading of data.  So it seems to me that
> "doRequest()" method should not
> really do anything at all.  In this case, you could send the data
> event manually, but that
> seems like a kludge as well:
>
>
>   <dataset name="mydset" request="true">
>         <!-- oninit handler doesn't fire either -->
>         <handler name="oninit">
>             this.ondata.sendEvent(this.data);
>         </handler>
>     </dataset>
>
> So maybe we should make all  'static' datasets send an ondata event
> when they are initialized? Or make an explicit method which forces a
> "ondata" event? I just am not sure
> that overloading doRequest() is the right thing to do....
>
>
>
>
>
>
> ---------- Forwarded message ----------
> From: Pablo Kang (JIRA) <jira at laszlosystems.com>
> Date: Sep 2, 2007 5:45 PM
> Subject: [JIRA] Created: (LPP-4632) Dataset doesn't send oninit event
> To: hminsky at laszlosystems.com
>
>
> Dataset doesn't send oninit event
> ---------------------------------
>
>                  Key: LPP-4632
>                  URL: http://www.openlaszlo.org/jira/browse/LPP-4632
>              Project: OpenLaszlo
>           Issue Type: Bug
>           Components: LFC - Data
>     Affects Versions: 4.0.3
>             Reporter: Pablo Kang
>          Assigned To: Henry Minsky
>
>
> This in turn doesn't fire doRequest if request="true".
>
> <canvas debug="true">
>
>     <handler name="oninit">
>         Debug.write('canvas init');
>     </handler>
>
>     <!-- request set to true but doRequest doesn't fire -->
>
>
> </canvas>
>
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>
>
> -- 
> Henry Minsky
> Software Architect
> hminsky at laszlosystems.com