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Date: Fri, 25 Jun 2004 14:38:57 +0200
From: jerome.picard@mpsa.com
Subject: Problem with the Lateral Cache.
To: 'Turbine JCS Users List' <turbine-jcs-user@jakarta.apache.org>
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 <OFDABDD9D2.1ACA0708-ONC1256EBE.00421172-C1256EBE.00457C17@mpsa.com>
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Hello,

I use "Lateral Cache" for test.

In another mail, you have explain me the functionality of the "Lateral"=

Cache. I thank you.

This is your text :

"Lateral cache treats all caches as peers. When a cache gets a cache mi=
ss,
it
asks all the other caches if they have the object in question. If one o=
f
them responds, the object is returned as a cache hit, but IS NOT stored=

locally. This topology is useful when you have caches which for the mos=
t
part maintain separate and unique indexes, but occasionally overlap. Al=
so
note that a local put does NOT result in a broadcast put to other later=
als,
but a remove WILL."

But when I execute a test, I obtain another behaviour.

I have two class "A" and "B".

class "A" has a local cache "A".
class "B" has a local cache "B".

First test :

I launch in first the class "B", this class want to retrieve many objec=
t
"User" in her local cache.

I launch in second time the class "A", this class put in her local cach=
e
many object "User".

At this moment, the class "B" retrieve and display all object "User". I=
t's
work.

I stop the class "A" and her local cache.
I am surprised , the class "B" always display object "User".
However you said that : "If one of
them responds, the object is returned as a cache hit, but IS NOT stored=

locally."

Second test :

I launch in first the class "A" which put in her local cache many objec=
t
"User".

I launch in second time the class "B" which try to retrieve all object
"User".

In this test, the class "B" always display NULL object.

For this case you sai that : "When a cache gets a cache miss, it
asks all the other caches if they have the object in question."

In my test, it is not working.

Is this a probleme of configuration ?

Have you an idea ?

Thanks for your answers.

Regards,


I join the cache file and code for the class "A" and "B".


###
### Cache A
###
# JCS Config for unit testing, just a simple memory only cache

jcs.default=3D
jcs.default.cacheattributes=3Dorg.apache.jcs.engine.CompositeCacheAttri=
butes
jcs.default.cacheattributes.MaxObjects=3D1000
jcs.default.cacheattributes.MemoryCacheName=3Dorg.apache.jcs.engine.mem=
ory.lru.LRUMemoryCache
jcs.default.elementattributes=3Dorg.apache.jcs.engine.ElementAttributes=

jcs.default.elementattributes.IsEternal=3Dfalse
jcs.default.elementattributes.IsLateral=3Dfalse

# SYSTEM GROUP ID CACHE
jcs.system.groupIdCache=3D
jcs.system.groupIdCache.cacheattributes=3Dorg.apache.jcs.engine.Composi=
teCacheAttributes
jcs.system.groupIdCache.cacheattributes.MaxObjects=3D10000
jcs.system.groupIdCache.cacheattributes.MemoryCacheName=3Dorg.apache.jc=
s.engine.memory.lru.LRUMemoryCache


jcs.region.TEST=3DLTCP
jcs.region.TEST.cacheattributes=3Dorg.apache.jcs.engine.CompositeCacheA=
ttributes
jcs.region.TEST.cacheattributes.MaxObjects=3D1000
jcs.region.TEST.cacheattributes.MemoryCacheName=3Dorg.apache.jcs.engine=
.memory.lru.LRUMemoryCache
jcs.region.TEST.elementattributes=3Dorg.apache.jcs.engine.ElementAttrib=
utes
jcs.region.TEST.elementattributes.IsRemote=3Dfalse
jcs.region.TEST.elementattributes.IsEternal=3Dfalse
jcs.region.TEST.elementattributes.IsLateral=3Dtrue


# simple Lateral TCP auxiliary
jcs.auxiliary.LTCP=3Dorg.apache.jcs.auxiliary.lateral.LateralCacheFacto=
ry
jcs.auxiliary.LTCP.attributes=3Dorg.apache.jcs.auxiliary.lateral.Latera=
lCacheAttributes
jcs.auxiliary.LTCP.attributes.TransmissionTypeName=3DTCP
jcs.auxiliary.LTCP.attributes.TcpServers=3Dlocalhost:1110
jcs.auxiliary.LTCP.attributes.TcpListenerPort=3D1111
jcs.auxiliary.LTCP.attributes.PutOnlyMode=3Dfalse


###
### Cache B
###
# JCS Config for unit testing, just a simple memory only cache

jcs.default=3D
jcs.default.cacheattributes=3Dorg.apache.jcs.engine.CompositeCacheAttri=
butes
jcs.default.cacheattributes.MaxObjects=3D1000
jcs.default.cacheattributes.MemoryCacheName=3Dorg.apache.jcs.engine.mem=
ory.lru.LRUMemoryCache
jcs.default.elementattributes=3Dorg.apache.jcs.engine.ElementAttributes=

jcs.default.elementattributes.IsEternal=3Dfalse
jcs.default.elementattributes.IsLateral=3Dfalse

# SYSTEM GROUP ID CACHE
jcs.system.groupIdCache=3D
jcs.system.groupIdCache.cacheattributes=3Dorg.apache.jcs.engine.Composi=
teCacheAttributes
jcs.system.groupIdCache.cacheattributes.MaxObjects=3D10000
jcs.system.groupIdCache.cacheattributes.MemoryCacheName=3Dorg.apache.jc=
s.engine.memory.lru.LRUMemoryCache


jcs.region.TEST=3DLTCP
jcs.region.TEST.cacheattributes=3Dorg.apache.jcs.engine.CompositeCacheA=
ttributes
jcs.region.TEST.cacheattributes.MaxObjects=3D1000
jcs.region.TEST.cacheattributes.MemoryCacheName=3Dorg.apache.jcs.engine=
.memory.lru.LRUMemoryCache
jcs.region.TEST.elementattributes=3Dorg.apache.jcs.engine.ElementAttrib=
utes
jcs.region.TEST.elementattributes.IsRemote=3Dfalse
jcs.region.TEST.elementattributes.IsEternal=3Dfalse
jcs.region.TEST.elementattributes.IsLateral=3Dtrue


# simple Lateral TCP auxiliary
jcs.auxiliary.LTCP=3Dorg.apache.jcs.auxiliary.lateral.LateralCacheFacto=
ry
jcs.auxiliary.LTCP.attributes=3Dorg.apache.jcs.auxiliary.lateral.Latera=
lCacheAttributes
jcs.auxiliary.LTCP.attributes.TransmissionTypeName=3DTCP
jcs.auxiliary.LTCP.attributes.TcpServers=3Dlocalhost:1111
jcs.auxiliary.LTCP.attributes.TcpListenerPort=3D1110
jcs.auxiliary.LTCP.attributes.PutOnlyMode=3Dfalse

#
# code of class A
#
      try{
                  JCS.setConfigFilename("/cacheA.ccf");

                  JCS cache =3D JCS.getInstance("TEST");


                        for(int i=3D0;i<500;i++){
                              User usr =3D new User(new Long(i));
                                    usr.setName("USER_" + i);

                              cache.put("USER_" + i ,usr);
                        }


                        System.out.println("end...");


                  while(true){
                        // Nothing
                  }


            }catch(CacheException cexp){
                  cexp.printStackTrace();
            }

#
# code of class B
#

            try{
                  JCS.setConfigFilename("/cacheB.ccf");

                  JCS cache =3D JCS.getInstance("TEST");

                  while(true){

                        for(int i=3D0;i<500;i++){
                              User usr =3D (User)cache.get("USER_" + i)=
;

                              if(usr!=3Dnull)
                                    System.out.println("User N=B0 " + i=
 + "
:" + usr.getName());

                        }


                  }

            }catch(CacheException cexp){
                  cexp.printStackTrace();
            }=


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