JCS is completely pluggable, unlike eh*%$^. Hence,
you can provide your own memory cache. An easy way to
do this would be to extend the LRUMemoryCache and
provide the logic that you need.
Since JCS is jdk1.3 compliant, I have not created any
memory size related methods. I will eventually put in
a memory cache that will balk if some percentage of
total memory is consumed. Alternatively, you could
spool the last item whenever some configurable
percentage of memory has ben reached.
Also, I'm working on a configuration option that will
allow you to put all items to disk and not just those
that are spooled.
Aaron
--- Ard Schrijvers <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I have a question regarding removing keys:
>
> In cocoon we have a JCSDefaultStore implementing
> org.apache.excalibur.store.Store interface. This
> interface has a method free(). store.free() (store
> can be the EHDefaultStore (ehcache) or the
> JCSDefaultStore, etc etc) is invoked by
> org.apache.excalibur.store.impl.StoreJanitorImpl
> when the JVM is low on memory.
>
> Free() tries to remove cachekeys+response to free
> some memory. For example, the JCSDefaultStore does
> it like below:
>
> public void free() {
> // TODO Find a better way
> MemoryCache memoryCache =
> this.cacheManager.getCache(region).getMemoryCache();
> Object[] keys = memoryCache.getKeyArray();
> if ( keys != null && keys.length > 0 ) {
> final Object key = keys[0];
> try {
>
> memoryCache.remove((Serializable)key);
> } catch (Exception ignore) {
>
> }
> }
> }
>
> The TODO speaks for itself. The EHDefaultStore using
> ehcache has this very same problem. Just removing
> cachekeys starting at index 0 does not improve the
> JVM when requests keep coming in, and the mainly
> important keys have been removed.
>
> I was told that from the outside, it is impossible
> to remove keys from the ehcache according the
> correct eviction policy. Does this also hold for
> JCS? And, furthermore, perhaps I just want to
> overflow the cached responses to disk (without
> having reached maxobjects) instead of removing them.
> That would clear memory and let me keep the cached
> responses.
>
> Is there something possible like,
>
> public void remove(int numberKeys) and
> public void overflow(int numberKeys)
>
> and that this is done according the correct eviction
> policy?
>
> Regards Ard
>
> --
>
> Hippo
> Oosteinde 11
> 1017WT Amsterdam
> The Netherlands
> Tel +31 (0)20 5224466
>
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> [EMAIL PROTECTED] / http://www.hippo.nl
>
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>
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