Re: New User Help

[Naveen Ayyagari]

I was able to get this working, I didnt implement my class as serializable....

I have a new question.....

I am using JCS inside a stateless EJB...
I understand it is implemented as singleton, so my cache should persist accross 
different instances of EJB..

Is this true if I configure my own config file using the following from the faq?
        CompositeCacheManager ccm = 
CompositeCacheManager.getUnconfiguredInstance();
        Properties props = new Properties();
        props.load(/* load properties from some location defined by your app 
*/);
        ccm.configure(props);

I need the cache to persist, but am worried that it gets a NEW 
"unconfiguredInstance" each time?

--Naveen

Naveen Ayyagari wrote:

Hello,

I checked if the result was null before attempting to add to the cache, however I am still unable to add my cacheSet object to the cache...

As a test I attempted to add a static string "test" as my cached object and that works fine.. What could be the problem with adding the cacheSet object that I created?

--Naveen

Al Forbes wrote:

Hi,

You cannot add null to the database - make sure that result != null.

Al

On 15/05/07, Naveen Ayyagari <[EMAIL PROTECTED]> wrote:

I am new to JCS and am having difficulty getting it up and running.

It looks like for some reason I am unable to add objects to the cache.... I have included all of my configuration below and hope that you will be able to

point me to what I am doing wrong.

I want to use a simple LRUMemory Cache. I don't care about auxiliary caches in this case.

I have tried configuring this stuff in so many ways....

My Goal is to cache Set<String> objects... To get around the generics casting errors

I have a small class that wraps the set:

private class cacheSet extends Object{
     public Set<String> set = null;
     public cacheSet(){
         set = new LinkedHashSet<String>();
     }
}

I have simplified the function that uses the cache below......

public Set<String> getSet(String Key){
     cacheSet result = null;
     Connection conn = null;


     //Check the Cache First
     result = (cacheSet)unitCache.get(attributeKey);

if(result == null){ //if it wasnt in the cache then go to DB

         result = new cacheSet();
         conn = ds.getConnection();

         /***************
             DATABASE CODE TO POPULATE SET
         ****************/

         try{ //add object to cache
             unitCache.put(attributeKey, (Object)result);
         }
         catch(Exception e){
             //This is not a fatal error it simply did not get cached.

//log the error so that if it happens alot we can troubleshoot it log.info("Unable to add to unitCache: " + e.getMessage() + " cause: " + e.getCause() );

         }
     }

     return result.set;
}

In the log file, I get the following line from my Exception Handler above

INFO: Unable to add to unitCache: cacheSet cause: null

I have tried everything I can think of to make this work.... Please any guidance would be much appreciated.

I am currently configuring the cache region like this in my constructor:
     try{

ICompositeCacheAttributes cacheAttr = new org.apache.jcs.engine.CompositeCacheAttributes();

         cacheAttr.setMaxObjects(500);

cacheAttr.setMemoryCacheName("org.apache.jcs.engine.memory.lru.LRUMemoryCache");

         cacheAttr.setUseLateral( false );
         cacheAttr.setUseRemote( false );

IElementAttributes elemAttr = new org.apache.jcs.engine.ElementAttributes();

         elemAttr.setIsEternal( true );
         elemAttr.setIsSpool( true );
         elemAttr.setIsLateral( false );
         elemAttr.setIsRemote( false );

         JCS.defineRegion("enumCache", cacheAttr, elemAttr);
         JCS.defineRegion("unitCache", cacheAttr, elemAttr);

         enumCache = JCS.getInstance("enumCache");
         unitCache = JCS.getInstance("unitCache");

     }
     catch(Exception e){
         throw new CommonRepositoryDaoSysException(
                 "Unable to setup Cache.", e);
     }

BUT have also tried configuring the region in ccf file like this:
# DEFAULT CACHE REGION
jcs.default=

jcs.default.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes

jcs.default.cacheattributes.MaxObjects=1000

jcs.default.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache

jcs.default.elementattributes=org.apache.jcs.engine.ElementAttributes
jcs.default.elementattributes.IsEternal=true
jcs.default.elementattributes.IsSpool=true
jcs.default.elementattributes.IsLateral=false
jcs.default.elementattributes.IsRemote=false

# Regions preconfigured for caching
#unit Cache
jcs.region.unitCache=

jcs.region.unitCache.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes

jcs.region.unitCache.cacheattributes.MaxObjects=1000

jcs.region.unitCache.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache jcs.region.unitCache.elementattributes=org.apache.jcs.engine.ElementAttributes

jcs.region.unitCache.elementattributes.IsEternal=true
jcs.region.unitCache.elementattributes.IsSpool=false
jcs.region.unitCache.elementattributes.IsLateral=false
jcs.region.unitCache.elementattributes.IsRemote=false


Thanks
--Naveen





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