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Ok but how do you know then the inter-relationships between your pages. For
example you create a new page on the top vertical menu. Even if you
validate and then flush this new page, how do you know that you will also
need to flush ALL the pages of your site, as this new top menu will also
appear on all the pages of your site!!! The same is true with all content
being reused from an absolute manner on your site (ex: you validate a news
somewhere on pid234 but that news also appear then on the home page and in
4 others sections in your site...). So you need either to flush all your
cache each time there is a modification (just to be sure they are
consistent) or to know all the relationships for each object of content
being validated (= on which other pages such and such content is
reused...)... And for that we use AOP in Jahia 5.0 in order to
automatically detect such relationships which are most of the time
hardcoded into your templates JSP scriptlets and that Jahia ignores....
Stéphane
At 14:32 25.11.2005, you wrote:
The external proxy
cache will be used only in anonymous access because of the problem
inconstent cache. Most off the sites are anonymous access. So in the file
"declarations.inc", I've had this. But I don't know how-to
calculate the
dLastPublicationTime date.
// Definition des
headers en fonction des droits des utilisateurs
// Si on
est en anonyme -->
utilisation du cache Apache
logger.
debug(
"Page
" + jData.page
().getID () + " (" + jData.page ().getTitle () + ")" );
if
(!jData
.gui ().isLogged ())
{
int
iCacheMaxExpire =
24 *3600;
Date
dExpires = new
Date
();
dExpires.
setTime(
dExpires.
getTime() + iCacheMaxExpire) ;
Date
dLastPublicationTime =
new
Date
(); // <--- How
to calculate this date ?
logger.
debug(
"Header
Expires = " +
getDateAsRFC822String(
dExpires)) ;
logger.
debug(
"Header
Last-Modified = " +
getDateAsRFC822String(
dLastPublicationTime ));
logger.
debug(
"Header
Cache-Control = " + "max-age="
+ iCacheMaxExpire + ", must-revalidate") ;
response.
addHeader(
"Expires", getDateAsRFC822String( dExpires)) ;
response.
addHeader(
"Last-Modified" , getDateAsRFC822String( dLastPublicationTime ));
response.
addHeader(
"Cache-Control" , "max-age=" + iCacheMaxExpire + ", must-revalidate") ;
}
// Autrement
--> pas
de cache Apache
else
{
Date
dExpiresAbsolute =
new
Date
();
dExpiresAbsolute.
setTime(
dExpiresAbsolute.
getTime() + 86400
);
logger.
debug(
"Header
Cache-Control = no-cache") ;
logger.
debug(
"Header
Pragma = No-Cache") ;
logger.
debug(
"Header
ExpiresAbsolute = " +
getDateAsRFC822String(
dExpiresAbsolute)) ;
logger.
debug(
"Header
Expires = -1");
response.
addHeader(
"Cache-Control" , "no-cache" );
response.
addHeader(
"Pragma", "No-Cache" );
response.
addHeader(
"ExpiresAbsolute"
, getDateAsRFC822String( dExpiresAbsolute)) ;
response.
addHeader(
"Expires", "-1" );
}
Mmmh it risks to be a bit less trivial than that.... Content may be reused
on several pages (so you can't simply flush the current page). Moreover, on
the same page, you can have various different permissions. etc, etc... So
replacing the current jahia HTML cache by an external cache proxy is not so
simple and rapidly your cache proxxy will become inconsistent. We are now
working for Jahia 5.0 on a new full cache server which will be compliant
with the ESI standard (= you can manage HTML fragments on a page and not
only full pages). Meanwhile it seems to me more easy to just embed some JSP
cache taglibs (cf OSCache HTML tags for instance) in your set of templates
rather than trying to configure an external cache proxy.
Cheers,
Stéphane
At 11:22 25.11.2005, ghislain\.cussonneau wrote:
Hi !
I use Jahia 4.0.6 and I want to use the apache cache server in front-off
Jahia for the HTML content. To do that, Jahia need to send some Http
Headers to Apache :
- Expires : (now + cache_max_expire_constant) date in rfc822 format
- Last-Modified : last publication date in rfc822 format
- Cache-Control : max-age=cache_max_expire_constant, must-revalidate
- ExpiresAbsolute : (nom + 24 hours) in rfc822 format
My problem is about calculate the "Last-Modified" date : I want
to use the date of the publication of the page in the workflow.
Is it possible with Jahia 4.0.6, because I can't find in Jahia API how to
get it ?
Which version of Jahia do I need to use ?
Thanks in advance
Ghislain CUSSONNEAU
DIRR/DPIL/CIS
CAP 44, Rue Marcel Sembat
44000 Nantes
02 51 84 48 80
Accédez au courrier électronique de La
Poste : www.laposte.net
;
3615 LAPOSTENET (0,34 /mn) ; tél : 08 92 68 13 50 (0,34/mn)
- -- ---
-----=[ scroisier at jahia dot com ]=---- --- -- -
CEO - Jahia Ltd, 45 rue de la gare, 1260 Nyon (Switzerland)
Jahia : The Java Unified Web Platform
www.jahia.org - The community and product web site
www.jahia.com - Our commercial services company
www.collaborativesource.org - The Collaborative Source Initiative
Ghislain CUSSONNEAU
DIRR/DPIL/CIS
CAP 44, Rue Marcel Sembat
44000 Nantes
02 51 84 48 80
CRIL Technology
Technoparc de l'Aubinière
44000 Nantes
02 51 89 64 50
Accédez au courrier électronique de La
Poste : www.laposte.net ;
3615 LAPOSTENET (0,34 /mn) ; tél : 08 92 68 13 50 (0,34/mn)
- -- --- -----=[
scroisier at jahia dot com ]=---- --- -- -
CEO - Jahia Ltd, 45 rue de la gare, 1260 Nyon (Switzerland)
Jahia : The Java Unified Web Platform
www.jahia.org - The
community and product web site
www.jahia.com - Our
commercial services company
www.collaborativesource.org
- The Collaborative Source Initiative
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