Re: Do DA's add a page to the app's cache ?
Re: Do DA's add a page to the app's cache ?
- Subject: Re: Do DA's add a page to the app's cache ?
- From: William Hatch <email@hidden>
- Date: Fri, 05 Sep 2008 13:58:58 -0400
On Sep 4, 2008, at 8:40 PM, Chuck Hill wrote:
On Sep 4, 2008, at 5:31 PM, William Hatch wrote:
I'm pretty sure that whenever you instance a new component using
pageWithName... it gets added to the page cache. I get around this
with the hackish method of adding this line in the components
constructor:
session().savePageInPermanentCache(this);
Does that not greatly increase memory usage?
It certainly could, but we only had a few instances and given how much
memory the app had allocated and what was available, (and being
unaware of your much better suggestion at the time) seemed to be an ok
trade off. Also, if the components you want to use are little widegty
type things (like summary views for a list inside a rep or something
like that) the other obvious thing would be to make them stateless and
not worry about it, if I'm correct in the belief that stateless
components are not kept in any page cache.
Chuck
which is no where near as nice as what Wonder does, but does work.
I've never had memory problems.
Using this, you can instantiate the components in your DA, set them
up however, then get the result string from generateResponse....
etc to ship it back to your js handler to do whatever with, in most
my cases it's InnerHTML type thing. Hope that helps.
Bill
On Sep 4, 2008, at 7:48 PM, Owen McKerrow wrote:
Hi All,
We have an app that has some small hand made AJAX on it (not the
cool stuff from project wonder) and we're having an issue with
page cacheing on the Applications side.
I had set the AJAX action up as a call to a DA which I had though
did not add to/effect the sessions page cache. So either that
assumption is wrong or I haven't made a clean break between the DA
and the session after all.
Anyways heres the error we're getting...
"The application backtracking limit of 30 has been exceeded."
Any suggestions ? Is turning off caching an option ?
Owen McKerrow
WebMaster, emlab
Ph : +61 02 4221 5517
http://emlab.uow.edu.au
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-Denis Stanton, On people using Command Line Interfaces
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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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