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Re: Listening for changes on an EO
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Re: Listening for changes on an EO


  • Subject: Re: Listening for changes on an EO
  • From: Chuck Hill <email@hidden>
  • Date: Thu, 9 Jul 2009 13:52:03 -0700


On Jul 9, 2009, at 1:45 PM, Lon Varscsak wrote:

I want to know if it's being changed.  I have a controller object that
will need to recalculate some values when a specific attribute changes
in the EO.

Why not just override the set... method to send the notification?



-Lon

On Thu, Jul 9, 2009 at 1:42 PM, Mark Morris<email@hidden> wrote:
Just a clarification, do you want to know when the value changes, even if
it's not saved to the database? Or do you just want to know if a change is
being saved? That would make a difference. ;-)


Regards,
Mark

On Jul 9, 2009, at 3:28 PM, Lon Varscsak wrote:

Uh, another question. :) Since I have a custom EO super-super class,
I decided to try to implement this in takeStoredValueForKey(..).


It works, although I was also trying to post the "old" value, and
asking for this current value at this point makes EOF not so
happy...but that's not strictly required for my needs.

However, it does post notifications even for fetched objects, what
would be the best way to only post changes after fetching?

Thanks again,

Lon

On Thu, Jul 9, 2009 at 12:43 PM, Lon Varscsak<email@hidden >
wrote:

Thanks for the tips!

-Lon

On Thu, Jul 9, 2009 at 12:34 PM, Chuck Hill<email@hidden >
wrote:

On Jul 9, 2009, at 12:26 PM, Lon Varscsak wrote:

Thanks.  I figured there was nothing built to do exactly what I
needed, but I figured I would ask.

Do you know if there is much overhead if I implemented this in my EO
superclass even if there were no observers?

EOF makes heavy use of notification. I would not expect there to be
much
overhead. You will probably want to qualify the notification with the
EC
(depending on what it is you are trying to do) to limit the number of
observers. And then keep the method receiving the notification fast.
The
notifications are synchronous, so you don't want anything slow in this
method.



Chuck




-Lon

On Thu, Jul 9, 2009 at 11:50 AM, Simon McLean<email@hidden >
wrote:

also, if you are using wonder, check out
hasKeyChangedFromCommittedSnapshot in ERXGenericRecord. maybe listen
for the notification mentioned by chuck, then use
hasKeyChangedFromCommittedSnapshot to check the particular key you are
looking at.


simon

2009/7/9 Chuck Hill <email@hidden>:

On Jul 9, 2009, at 10:24 AM, Lon Varscsak wrote:

Is there a way for a controller object to listen for changes to an
EO
(and a specific key)?


Thanks,

Lon

EOEditingContext has ObjectsChangedInEditingContextNotification, but
it
is
on an object by object basis, not a key by key one.


You could implement this in your EO super class.


Chuck

--
Chuck Hill             Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their
overall
knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects







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-- Chuck Hill Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their overall
knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects









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Do not post admin requests to the list. They will be ignored.
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_______________________________________________
Do not post admin requests to the list. They will be ignored.
Webobjects-dev mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden


-- Chuck Hill Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects







_______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden
  • Follow-Ups:
    • Re: Listening for changes on an EO
      • From: Lon Varscsak <email@hidden>
References: 
 >Listening for changes on an EO (From: Lon Varscsak <email@hidden>)
 >Re: Listening for changes on an EO (From: Chuck Hill <email@hidden>)
 >Re: Listening for changes on an EO (From: Simon McLean <email@hidden>)
 >Re: Listening for changes on an EO (From: Lon Varscsak <email@hidden>)
 >Re: Listening for changes on an EO (From: Chuck Hill <email@hidden>)
 >Re: Listening for changes on an EO (From: Lon Varscsak <email@hidden>)
 >Re: Listening for changes on an EO (From: Lon Varscsak <email@hidden>)
 >Re: Listening for changes on an EO (From: Mark Morris <email@hidden>)
 >Re: Listening for changes on an EO (From: Lon Varscsak <email@hidden>)

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