On Nov 5, 2007, at 12:27 PM, Sie, Yang wrote:
Hello all:
I am trying to monitor memory consumption for all cache objects in
Jetspeed. This is what I did and for some reason that memoryStoreSize
and calculateInMemorySize gave me zero.
This is what I did basically by using EhCache API:
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
CacheManager ehCacheManager=CacheManager.getInstance();
String[] cacheNames=ehCacheManager.getCacheNames();
I looped thru the names and get 6 cache object names (which matches
what
defined in ehcache.xml)
preferencesCache
portletApplicationNameCache
portletDefinitionOidCache
portletDefinitionNameCache
portletApplicationOidCache
portletContentCache
Then I used following
Cache thisCache=ehCacheManager.getCache(aCacheName);
long mss=thisCache.getMemoryStoreSize();
This API returns the number of elements in the memory store.
Could it be possible that we haven't loaded any prefs yet at this point?
long ims=thisCache.calculateInMemorySize();
This call gets the size of the memory store for this cache.
Perhaps if its not yet in use, it returns 0.
According to the javadocs:
Warning: This method can be very expensive to run. Allow
approximately 1 second per 1MB of entries.
Running this method could create liveness problems because the
object lock is held for a long period
Returns:
the approximate size of the memory store in bytes
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