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 protected]>
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 protected]>:
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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