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Subject: RE: Cache (persistence & performance)
Date: Tue, 17 Apr 2007 13:28:59 +0200
Message-ID: <A955EA1F8FE31749AEC8C998082F6C7CD6E933@webmail.hippo.nl>
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Thread-Topic: Cache (persistence & performance)
Thread-Index: AceA1IWLtx2A4MAwQQuGPSX8RYVeswADmqQw
From: "Ard Schrijvers" <a.schrijvers@hippo.nl>
To: <users@cocoon.apache.org>
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> Thank you for your reply, Ard!
>=20
> I don't know how to control the cache from cocoon.xconf. I use Cocoon=20
> 2.1.7. The cache section in cocoon.xconf looks like this:
>=20
>   <transient-store logger=3D"core.store.transient">
>     <parameter name=3D"maxobjects" value=3D"1000"/>
>   </transient-store>
> =20
>   <store logger=3D"core.store">
>     <parameter name=3D"maxobjects" value=3D"1000"/>
>   </store>
>=20
> I see two files being modified after some "action" using the webapp:=20
> cocoon-ehcache-1.data & cocoon-ehcache-1.index. I asume
> that this is the persistent cache.=20

It is a cache that uses disk. It is only diskpersistent when you =
configure it to be. The transient store is a memory only store, because =
it has non serializable cached objects.

The second store is you configuration for the ehcache. You can add:

<parameter name=3D"diskpersistent" value=3D"true"/>

but it might be very well possible that this is added after cocoon 2.1.7 =
, so you would need to update.

Chech the EHDefaultStore.java to see which parameters are allowed, or =
check the wiki (dont know if is up2date) and look for "caching", =
"ehcache", "ard schrijvers" etc in=20

http://marc.info/?l=3Dxml-cocoon-users&r=3D1&w=3D2

i have posted many explanations on cocoon caching before,

Regards Ard

> Am I right? If so, why=20
> doesn't Cocoon=20
> use this cache after a webserver restart? I put System.out.println
> statements in my generators and they confirm that the content=20
> is being=20
> regenerated (content is cached correctly while the webserver=20
> is running).
> It's like a transient cache is working correctly, but a=20
> persistent cache=20
> is not.
>=20
> Where can I find the parameters that I can use with these 2 stores?
> As you said, I want cache that is persistent between JVM=20
> restarts. Can I=20
> get a step further and copy the persistent cache
> to another installation of my webapp (onto another webserver)?
>=20
> I'm sure that I do not have all the information needed about this=20
> matter. Can you please provide some good links ? I only
> found bits and pieces here and there all around the web=20
> (weird sentence:).
>=20
> Thanks a lot!
>=20
> Dan
>=20
> Ard Schrijvers wrote:
> > Hello Dan,
> >
> >  =20
> >> Hi!
> >>
> >> I have been trying for a few days now to find out where (and=20
> >> if) Cocoon persists
> >> the cached XML chunks obtained from pipelines. Almost all of=20
> >> the pipelines I've
> >> written implement CacheableProccessingComponent.=20
> >>    =20
> >
> > You mean all your compoments in a pipeline implement=20
> CacheableProccessingComponent. If one does not,
> > your cocoon caches untill the first not cacheable=20
> transformer (if the generator does not cache,
> > nothing gets cached. Also, implementing=20
> CacheableProccessingComponent is no garantuee for a proper working
> > cache of your component. The cachekey and validity object=20
> do have to make sense! [1] )
> >
> >  =20
> >> I read=20
> >> something about a
> >> <persistent-store> tag in cocoon.xconf, but I didn't=20
> >> understand much.=20
> >>    =20
> >
> > A persistent-store...just to be sure, means that you want a=20
> cache that is persistent between JVM restarts, right? If you=20
> are using EHCache,=20
> > you can see in this code snippet where it stores the cached=20
> responses (if you use EHCache):
> >
> > 	try {
> >             if=20
> (parameters.getParameterAsBoolean("use-cache-directory", false)) {
> >                 if (this.getLogger().isDebugEnabled()) {
> >                     getLogger().debug("Using cache=20
> directory: " + cacheDir);
> >                 }
> >                 setDirectory(cacheDir);
> >             }
> >             else if=20
> (parameters.getParameterAsBoolean("use-work-directory", false)) {
> >                 if (this.getLogger().isDebugEnabled()) {
> >                     getLogger().debug("Using work=20
> directory: " + workDir);
> >                 }
> >                 setDirectory(workDir);
> >             }
> >             else if (parameters.getParameter("directory",=20
> null) !=3D null) {
> >                 String dir =3D parameters.getParameter("directory");
> >                 dir =3D=20
> IOUtils.getContextFilePath(workDir.getPath(), dir);
> >                 if (this.getLogger().isDebugEnabled()) {
> >                     getLogger().debug("Using directory: " + dir);
> >                 }
> >                 setDirectory(new File(dir));
> >             }
> >             else {
> >                 try {
> >                     // Legacy: use working directory by default
> >                     setDirectory(workDir);
> >                 } catch (IOException e) {
> >                 }
> >             }
> >         } catch (IOException e) {
> >             throw new ParameterException("Unable to set=20
> directory", e);
> >         }
> >
> > in cocoon.xconf, you can set in the ehcache store=20
> configuration, <parameter name=3D"diskpersistent" value=3D"true"/>
> >
> >
> >  =20
> >> Can you
> >> please tell me how, or at least where is Cocoon persisting=20
> >> its cache and is
> >> there a way to redirect this persistence (say to a DB)?
> >>    =20
> >
> > To a DB....I would use a Cache which is capable of=20
> persisting in a DB (JCS can, I suppose EHCache also)
> >
> >  =20
> >> And another thing... Can you please tell me what parameters=20
> >> do I need to modify
> >> in order to temper with Cocoon's cache performance.
> >>    =20
> >
> > ?? what do you mean? Anyway, the cache parameters are in=20
> cocoon.xconf in <store>. You can find this on the wiki
> >
> >  =20
> >> P.S. By Cocoon's cache, I understand cached versions of a XML=20
> >> generated
> >> response. Is this correct? Maybe I got it all wrong...
> >>    =20
> >
> > Hmmm, more or less you could see it that way (though it is=20
> more subtle, look at CachedResponse if you want to know=20
> more...also look at your=20
> > localhost:port/status page to see which cachekeys are created)
> >
> >  =20
> >> Many thanks!
> >>    =20
> >
> > Regards Ard
> >
> > [1] http://cocoon.zones.apache.org/daisy/cdocs/g1/g1/g7/690.html
> >
> >  =20
> >> Dan
> >>
> >> ----------------------------------------------------------------
> >> This message was sent using IMP, the Internet Messaging Program.
> >>
> >>
> >>
> >>=20
> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail: users-unsubscribe@cocoon.apache.org
> >> For additional commands, e-mail: users-help@cocoon.apache.org
> >>
> >>
> >>    =20
> >
> >=20
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> >
> >
> >
> >  =20
>=20
>=20
>=20
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