Re: Problem with pages saved in a variable
Re: Problem with pages saved in a variable
- Subject: Re: Problem with pages saved in a variable
- From: Miguel Arroz <email@hidden>
- Date: Tue, 13 Oct 2009 21:13:15 +0100
Hi!
Chuck is right, your completely screwing WebObjects up.
pageWithName returns you a component initialized for a given context
(WOContext, not EOEditingContext). If you are using the same pages for
different situations and mixing up sessions and stuff, NOTHING will
work. Nothing. Even if it APPEARS to work on your computer, it won't
on production with many users using the app simultaneously. I can't
even think about how many problems will it create, WO is simply not
supposed to work like that.
Also, WebObjects already caches a lot of stuff internally (if you
compare the time it takes to load a page generated by a given
component the first and subsequent times, you'll see this clearly), so
you don't need to hack in any more caches, you're probably making the
performance worse instead of improving it (and killing correctness, of
course).
Delete all that, and simply use pageWithName normally.
Yours
Miguel Arroz
On 2009/10/13, at 20:24, Chuck Hill wrote:
You are messing up WO's maintenance of page state. I am surprised
this does not cause more issues for you.
Why are you doing this? It seems like a rather bad idea.
Chuck
On Oct 13, 2009, at 1:29 AM, Andri vonAllmen wrote:
Dear List,
in an Applications Session, a NSMutableDictionary object is used for
"caching" pages. Everytime the "pageWithName" method is called, the
dictionary is queried in order to determine if the requested page
does
already exist, if true the existing page is returned, else a new
one is
generated and stored in the dictionary. This is made in
Application.java
by overriding the "pageWithName" method:
public WOComponent pageWithName(String aName, WOContext aContext) {
Object result = null;
if ( aContext.hasSession() ) result =
((NSMutableDictionary)
((Session)aContext.session()).cachedPages()).objectForKey(aName);
if ( result == null ) {
result = super.pageWithName(aName, aContext);
if ( aContext.hasSession() ) if ( aName != null )
((NSMutableDictionary)
((Session)aContext.session()).cachedPages()).setObjectForKey(result,
aName);
}
return (WOComponent)result;
}
This works with one exception. Making changes on Enterprise Objects
is
not possible in every case. Saving changes works, if always the same
object is changed but not if two different objects are changed
(changing
the first, saving the changes, then changing the second and saving
the
changes). But if making changes on a object, saving it, and then
revert
the changes (to the same state as before changing it the first time),
making changes on other objects is possible.
As mentioned in the WO API Reference, for pages being stored in a
variable the "ensureAwakeInContext" method has to be called, but this
has no effect. Same if refreshing the objects in the default editing
context ("refreshAllObjects", "refaultAllObjects") which is used on
all
pages.
Any suggestions or other hints would be appreciated.
Regards
Andri
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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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