Thank you for your reply, Ard!
I don't know how to control the cache from cocoon.xconf. I use Cocoon
2.1.7. The cache section in cocoon.xconf looks like this:
<transient-store logger="core.store.transient">
<parameter name="maxobjects" value="1000"/>
</transient-store>
<store logger="core.store">
<parameter name="maxobjects" value="1000"/>
</store>
I see two files being modified after some "action" using the webapp:
cocoon-ehcache-1.data & cocoon-ehcache-1.index. I asume
that this is the persistent cache. Am I right? If so, why doesn't Cocoon
use this cache after a webserver restart? I put System.out.println
statements in my generators and they confirm that the content is being
regenerated (content is cached correctly while the webserver is running).
It's like a transient cache is working correctly, but a persistent cache
is not.
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 restarts. Can I
get a step further and copy the persistent cache
to another installation of my webapp (onto another webserver)?
I'm sure that I do not have all the information needed about this
matter. Can you please provide some good links ? I only
found bits and pieces here and there all around the web (weird sentence:).
Thanks a lot!
Dan
Ard Schrijvers wrote:
Hello Dan,
Hi!
I have been trying for a few days now to find out where (and
if) Cocoon persists
the cached XML chunks obtained from pipelines. Almost all of
the pipelines I've
written implement CacheableProccessingComponent.
You mean all your compoments in a pipeline implement
CacheableProccessingComponent. If one does not,
your cocoon caches untill the first not cacheable transformer (if the generator
does not cache,
nothing gets cached. Also, implementing CacheableProccessingComponent is no
garantuee for a proper working
cache of your component. The cachekey and validity object do have to make
sense! [1] )
I read
something about a
<persistent-store> tag in cocoon.xconf, but I didn't
understand much.
A persistent-store...just to be sure, means that you want a cache that is persistent between JVM restarts, right? If you are using EHCache,
you can see in this code snippet where it stores the cached responses (if you use EHCache):
try {
if (parameters.getParameterAsBoolean("use-cache-directory", false))
{
if (this.getLogger().isDebugEnabled()) {
getLogger().debug("Using cache directory: " + cacheDir);
}
setDirectory(cacheDir);
}
else if (parameters.getParameterAsBoolean("use-work-directory",
false)) {
if (this.getLogger().isDebugEnabled()) {
getLogger().debug("Using work directory: " + workDir);
}
setDirectory(workDir);
}
else if (parameters.getParameter("directory", null) != null) {
String dir = parameters.getParameter("directory");
dir = 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 directory", e);
}
in cocoon.xconf, you can set in the ehcache store configuration, <parameter
name="diskpersistent" value="true"/>
Can you
please tell me how, or at least where is Cocoon persisting
its cache and is
there a way to redirect this persistence (say to a DB)?
To a DB....I would use a Cache which is capable of persisting in a DB (JCS can,
I suppose EHCache also)
And another thing... Can you please tell me what parameters
do I need to modify
in order to temper with Cocoon's cache performance.
?? what do you mean? Anyway, the cache parameters are in cocoon.xconf in
<store>. You can find this on the wiki
P.S. By Cocoon's cache, I understand cached versions of a XML
generated
response. Is this correct? Maybe I got it all wrong...
Hmmm, more or less you could see it that way (though it is more subtle, look at CachedResponse if you want to know more...also look at your
localhost:port/status page to see which cachekeys are created)
Many thanks!
Regards Ard
[1] http://cocoon.zones.apache.org/daisy/cdocs/g1/g1/g7/690.html
Dan
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