Miles Elam wrote: > <snip> > > On the other end, instead of fam, the same might be used for databases > as well. For example, PostgreSQL could have a trigger function > written that, when a dependent set of tables are changed, a cache > expiration queue table could be populated with the affected entries > and a linked C function (in the database) could fire off a "cache > expired" message to the app server. But of course, this requires that > something like Cocoon have a socket listener or constantly open > connection to its data input source.
This kind of expiration messages is already implemented into DBPrism External Invalidator Server which works with ESI (http://www.w3.org/TR/esi-invp) invalidation protocol. I'll upload a new patch to Cocoon's Bugzilla system with the new implementation of DBPrism beta sources at this time only available through CVS access into DBPrism SourceForge website (http://sourceforge.net/projects/dbprism/), look at the link browse CVS and the directories prism/src/org/apache/cocoon/* . New implementation of InMemoryServerImpl provides support for basic and avanced selector using regular expresion (http://www.dbprism.com.ar/dbprism/doc/xdocs/Server.html) A tipical flow of interaction using databases as source of invalidation messages is showed at (http://www.dbprism.com.ar/dbprism/doc/cms/CMS-WebCache.html), but the source of the invalidation messages could be any sources, including a simple telnet program which contact the invalidation server and sent the message like this: POST /dbprism/x-dbprism-cache-invalidate HTTP/1.0 Authorization: BASIC aW52YWxpZGF0b3I6aW52YWxpZGF0b3I= Content-Length: 190 <?xml version="1.0"?> <INVALIDATION VERSION="WCS-1.0"> <OBJECT> <BASICSELECTOR URI="/docs/samples/xsp/simple_ext.xsp"/> <ACTION REMOVALTTL="0"/> </OBJECT> </INVALIDATION> The listening process is a simple XSP page (http://www.dbprism.com.ar/dbprism/view-source?filename=/invalidate.xsp) which interprets the invalidation message and contacts the invalidation server running inside cocoon. DBPrism CMS provides a set of Oracle triggers that synchronizates the content of the CMS with the content showed by Cocoon providing an average repsonse time similar to static xml pages. > > <snip> > > More info on fam: http://oss.sgi.com/projects/fam/faq.html > More info on TUX: http://www.redhat.com/docs/manuals/tux/TUX-2.2-Manual/ I'll look these urls ;) > > > > Thanks for your time, > > Miles > > Best regards, Marcelo. -- Marcelo F. Ochoa - [EMAIL PROTECTED] Do you Know DB Prism? Look @ http://www.plenix.com/dbprism/ More info? Chapter 21 of the book "Professional XML Databases" (Wrox Press http://www.wrox.com/) Chapter 8 of the book "Oracle & Open Source" (O'Reilly http://www.oreilly.com/catalog/oracleopen/) ----------------------------------------------- Lab. de Sistemas - Fac. de Cs. Exactas - UNICEN Paraje Arroyo Seco - Campus Universitario (7000) Tandil - Bs. AS. - Argentina Te: +54-2293-444430 Fax: +54-2293-444431 --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED]
