Re: Detecting eo changes when they happen

• Subject: Re: Detecting eo changes when they happen
• From: "John Bruce" <email@hidden>
• Date: Thu, 12 Oct 2006 12:00:50 +1000
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Hi Florijan,

One option that might be worth considering is adding standard java
bean property change support to your eo's since this is a Swing app.
You could do that via EOGenerator as previously described but another
way could be to do it using aspects. I remember reading an article
about this a while back where you use an annotation to apply an aspect
which then adds the property change support so that you don't have to
implement it for each method. Might be overkill since doing it using a
generated super class it probably easier.

An advantage of using the bean property change system would be that it
would be easy to bind to other swing components eg Glazed Lists,
http://www.publicobject.com/glazedlists

Anyway just a though.

Cheers,

John

Florijan,

the code I am proposing builds upon the
ObjectsChangedInEditingContextNotification. This notification is
posted as changes happen. It is not delayed until saveChanges(). This
is actually used in the Java client to update the UI as changes happen.

This is also posted when changes from other editing contexts are
merged in.

Pierre

On 11 Oct 2006, at 14:34, Florijan Stamenkovic wrote:

> Hi Pierre,
>
>
> Thanks for pointing the code, it is however not what I need. It was
> my first thought to listen for EditingContext notifications, but
> they only are posted on some EditingContext actions, like
> saveChanges(), and not when an edit on an EO happens in the client
> editing context. I need to be notified as soon as for example:
>
> person.setName("Dodo");
>
> is called, and the change to person done, even though it is not yet
> committed to the parent object store.
>
> Best regards,
> Flor
>
>> Hi!
>>
>> Using the ChangeNotificationCenter from http://www.bernard-web.com/
>> pierre/webobjects/code.html you may be notified that an object has
>> changed. It won't however tell you which attribute was affected.
>

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