Ard Schrijvers suggested changing use of "jcs" below to "cache" because he thought "jcs" just had default configuration. This is wrong. I stepped through the code and saw that when the elements were being put in the cache they were put in with an idle time of 5 seconds as I setup in the setupProperties() method, not with a default value of idle time. Anyway, the "cache" object doesn't have get() and put() methods so it can't be used directly for storing information in JCS. I access the "cache" object directly only to be able to retrieve the element attributes associated with the cache (getElementAttributes) and the count of expired items (getMissCountExpired).
It looks to me like there is a bug in JCS as I originally thought. Stepping in the code, when it tries to get the item from the cache (in LRUMemoryCache.get()) it sets the last access time to now which messes up the later checking of how long the item has been idle. I think the code that is getting the item from the cache should call LRUMemoryCache.getQuiet() instead of LRUMemoryCache.get(). That code is in CompositeCache.get(). I'm not sure what other effects calling LRUMemoryCache.getQuiet() instead of LRUMemoryCache.get() will have though. -----Original Message----- From: Ard Schrijvers [mailto:[EMAIL PROTECTED] To: jcs-users@jakarta.apache.org Subject: RE: Possible bug in JCS with IdleTime element attribute > > I think I may have found a bug in JCS with regards to the > IdleTime element attribute. Either that > or I don't understand how this setting works. I thin you have a bug in your test... > > import junit.framework.TestCase; > > public class TestMissCountExpiredBug extends TestCase > { > public void testSomething() > throws Exception > { > // setup JCS > CompositeCacheManager mgr = > CompositeCacheManager.getUnconfiguredInstance(); > mgr.configure( setupProperties() ); > > // get access to bug test cache region > JCS jcs = JCS.getInstance( "BugTest" ); > CompositeCache cache = mgr.getCache( "BugTest" ); now, cache is the cache you get from your configured CompositeCacheManager. I think, your jcs has just default configuration, because I do not see where it is configured..? If you replace jcs below, with cache, you probably will see, everything works just fine, Regards Ard > > // put five items in cache > for ( int i = 0; i < 5; i++ ) > { > String key = "key" + i; > String value = "value" + i; > jcs.put( key, value ); > } > > // sleep for twice the length of the max idle time of > items in the cache > // region > IElementAttributes attrs = cache.getElementAttributes(); > long idleTimeSeconds = attrs.getIdleTime(); > assertEquals( 5L, idleTimeSeconds ); > System.out.println( "idle time seconds=" + idleTimeSeconds ); > long sleepTime = 1000 * 2 * idleTimeSeconds; > System.out.println( "sleeping for " + sleepTime > + " millis to allow cache elements to be flagged as > idle for too long" ); > Thread.sleep( sleepTime ); > > // try to access the five items - they should have > expired so this should > // fail > for ( int i = 0; i < 5; i++ ) > { > String key = "key" + i; > Object value = jcs.get( key ); > if ( value != null ) > { > System.out.println( "found a value for key " + key + > ": " + value ); > } > } > > // check miss count expired - should be five > int missCountExpired = cache.getMissCountExpired(); > System.out.println( "miss count expired: " + missCountExpired ); > assertEquals( 5, missCountExpired ); > } > > private Properties setupProperties() > { > Properties answer = new Properties(); > > // defaults > answer.setProperty( "jcs.default", "" ); > answer.setProperty( "jcs.default.cacheattributes", > "org.apache.jcs.engine.CompositeCacheAttributes" ); > answer.setProperty( > "jcs.default.cacheattributes.MemoryCacheName", > "org.apache.jcs.engine.memory.lru.LRUMemoryCache" ); > answer.setProperty( > "jcs.default.cacheattributes.MaxObjects", "100000" ); > > // bug test region - elements won't go to disk, but > should be marked as expired after five seconds of non-use > answer.setProperty( "jcs.region.BugTest", "" ); > answer.setProperty( "jcs.region.BugTest.cacheattributes", > "org.apache.jcs.engine.CompositeCacheAttributes" ); > answer.setProperty( > "jcs.region.BugTest.cacheattributes.MemoryCacheName", > "org.apache.jcs.engine.memory.lru.LRUMemoryCache" ); > answer.setProperty( > "jcs.region.BugTest.cacheattributes.MaxObjects", "1000" ); > answer.setProperty( > "jcs.region.BugTest.cacheattributes.UseMemoryShrinker", "false" ); > answer.setProperty( > "jcs.region.BugTest.elementattributes", > "org.apache.jcs.engine.ElementAttributes" ); > answer.setProperty( > "jcs.region.BugTest.elementattributes.IsEternal", "false" ); > answer.setProperty( > "jcs.region.BugTest.elementattributes.IdleTime", "5" ); > > return answer; > } > } > > > > > > > > ______________________________________________________________ > ______________________ > Now that's room service! 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