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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