Re: Publication date

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