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From "hanasaki jiji" <hanas...@gmail.com>
Subject Re: Objects disappearing from cache
Date Wed, 20 Feb 2008 03:56:54 GMT
Just remember that nothing will auto-age out of the cache with these settings.

On Feb 19, 2008 3:08 PM, Al Forbes <forbes.al@googlemail.com> wrote:
> Hi,
>
> I did not look at the details of you problem. JCS does work, so try these:
>
> jcs.default.elementattributes.IdleTime=-1
>
> jcs.region.testCache1.elementattributes.IsEternal=true
>
>
>
> On 18/02/2008, KWeisser <keweisse@us.ibm.com> wrote:
> >
> > I'm currently using JCS to cache the search results returned from a query,
> > and then using the cache to help me implement pagination.  I'm running
> > Rational Software Architect 7.0.0.4, and am experiencing some odd behavior.
> >
> > Initially, I am able to set the result set (an ArrayList of 200 Object) onto
> > the cache.  I then access the cache to fetch the first 10 results from the
> > ArrayList.  The cache is also accessed to determine the total number of
> > records that I have.  I'm typically able to access this ArrayList off the
> > cache 4 or 5 times, and after that the get method returns null for my
> > ArrayList.  Any idea why this object is dissappearing from the cache after
> > several times of successfully accessing the ArrayList?  Any help is greatly
> > appreciated.
> >
> > Here is my cache.ccf file:
> > # DEFAULT CACHE REGION
> >
> > jcs.default=DC,LTCP
> > jcs.default.cacheattributes=
> >     org.apache.jcs.engine.CompositeCacheAttributes
> > jcs.default.cacheattributes.MaxObjects=1000
> > jcs.default.cacheattributes.MemoryCacheName=
> >     org.apache.jcs.engine.memory.lru.LRUMemoryCache
> >
> > # PRE-DEFINED CACHE REGIONS
> >
> > jcs.region.testCache1=DC,LTCP
> > jcs.region.testCache1.cacheattributes=
> >     org.apache.jcs.engine.CompositeCacheAttributes
> > jcs.region.testCache1.cacheattributes.MaxObjects=1000
> > jcs.region.testCache1.cacheattributes.MemoryCacheName=
> >     org.apache.jcs.engine.memory.lru.LRUMemoryCache
> > jcs.region.testCache1.cacheattributes.UseMemoryShrinker=true
> > jcs.region.testCache1.cacheattributes.MaxMemoryIdleTimeSeconds=3600
> > jcs.region.testCache1.cacheattributes.ShrinkerIntervalSeconds=60
> > jcs.region.testCache1.cacheattributes.MaxSpoolPerRun=500
> > jcs.region.testCache1.elementattributes=org.apache.jcs.engine.ElementAttributes
> > jcs.region.testCache1.elementattributes.IsEternal=false
> >
> >
> > # AVAILABLE AUXILIARY CACHES
> > jcs.auxiliary.DC=
> >     org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory
> > jcs.auxiliary.DC.attributes=
> >     org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheAttributes
> > jcs.auxiliary.DC.attributes.DiskPath=g:/dev/jcs/raf
> > jcs.auxiliary.DC.attributes.maxKeySize=100000
> >
> > jcs.auxiliary.LTCP=
> >     org.apache.jcs.auxiliary.lateral.LateralCacheFactory
> > jcs.auxiliary.LTCP.attributes=
> >     org.apache.jcs.auxiliary.lateral.LateralCacheAttributes
> > jcs.auxiliary.LTCP.attributes.TransmissionTypeName=TCP
> > jcs.auxiliary.LTCP.attributes.TcpServers=localhost:1111
> > jcs.auxiliary.LTCP.attributes.TcpListenerPort=1110
> > jcs.auxiliary.LTCP.attributes.PutOnlyMode=false
> >
> > Here is my code accessing the cache:
> > /**
> >  * This is a sample LazyLoading DataScroller that
> >  * uses the JSF LazyLoading DataScroller library
> >  * @author hazems
> >  */
> > public class MyLazyLoadingDataScroller extends
> > AbstractLazyLoadingDataScroller {
> >
> >         public MyLazyLoadingDataScroller() {
> >                 //Pass the id of the dataTable to the AbstractLazyLoadingDataScroller
base
> >                 super("tableEx1");
> >         }
> >
> >         /**
> >          * Override for getting the data from the Database
> >          * Use the getOffset() and the getPageSize() to know
> >          * the From and To records to be gotten from the Database
> >          */
> >         public List getPageData() {
> >                 int pageSize = getPageSize();
> >                 int offset = getOffset();
> >                 List pageData = new ArrayList();
> >                 ArrayList lst = new ArrayList();
> >
> >                 try {
> >                         JCS cache = JCS.getInstance("default");
> >                         lst = (ArrayList)cache.get("caseSrchResults");
> >
> >                         if (lst != null){
> >                                 for (int i = offset; (i < pageSize + offset)
&& (i < lst.size()); ++i) {
> >                                         pageData.add(lst.get(i));
> >                                 }
> >                         }
> >             } catch ( CacheException e ) {
> >                 e.printStackTrace();
> >             }
> >
> >                 return pageData;
> >         }
> >
> >         public int getStart(){
> >                 return getOffset();
> >         }
> >
> >         public int getEnd(){
> >                 return getPageSize() + getOffset();
> >         }
> >
> >         /**
> >          * Override this method to return the total number of records
> >          */
> >         public int getTotalNumberOfRows() {
> >                 ArrayList lst = new ArrayList();
> >
> >                 // in your constructor you might do this
> >                 try {
> >                         JCS cache = JCS.getInstance("default");
> >                         lst = (ArrayList)cache.get("caseSrchResults");
> >             } catch ( CacheException e ) {
> >                 e.printStackTrace();
> >             } catch ( Exception e){
> >                 e.printStackTrace();
> >             }
> >             if (lst == null) return 0;
> >             else return lst.size();
> >         }
> > }
> >
> > --
> > View this message in context: http://www.nabble.com/Objects-disappearing-from-cache-tp15547022p15547022.html
> > Sent from the JCS - Users mailing list archive at Nabble.com.
> >
> >
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> >
> >
>
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