How to write custom unit calculator

We are using Coherence 3.4.2 for Java. I am trying to write our own unit calculator. As I played with the example coming with Coherence, I modify the explore-config.xml as following:
<cache-config>
<caching-scheme-mapping>

<cache-mapping>
<cache-name>*</cache-name>
<scheme-name>default-distributed</scheme-name>
</cache-mapping>
<cache-mapping>
<cache-name>VirtualCache</cache-name>
<scheme-name>default-distributed</scheme-name>
</cache-mapping>
</caching-scheme-mapping>
<caching-schemes>

<replicated-scheme>
<scheme-name>default-replicated</scheme-name>
<service-name>ReplicatedCache</service-name>
<backing-map-scheme>
<class-scheme>
<scheme-ref>default-backing-map</scheme-ref>
</class-scheme>
</backing-map-scheme>
</replicated-scheme>

<distributed-scheme>
<scheme-name>default-distributed</scheme-name>
<service-name>DistributedCache</service-name>
<backing-map-scheme>
<local-scheme>
<high-units>272</high-units>
<low-units>50</low-units>
*<unit-calculator><class-scheme><class-name>com.tangosol.examples.explore.TestMemoryCalculator</class-name></class-scheme></unit-calculator>*
</local-scheme>
</backing-map-scheme>
</distributed-scheme>

<class-scheme>
<scheme-name>default-backing-map</scheme-name>
<class-name>com.tangosol.util.SafeHashMap</class-name>
</class-scheme>
</caching-schemes>
</cache-config>
I write the very simple java code:
package com.tangosol.examples.explore;
import com.tangosol.net.cache.OldCache;
class TestMemoryCalculator implements OldCache.UnitCalculator {
public TestMemoryCalculator() {
public int calculateUnits(Object oKey, Object oValue) {
int size = 0;
System.out.println("size = " + size);
return size;
When I try to run the example program, I got the following error:
yzhang@bsdhcp174172:~/work/coherence> java -cp ./lib/coherence.jar:./lib/tangosol.jar:./examples/java -Dtangosol.coherence.cacheconfig=./examples/config/explore-config-dist.xml com.tangosol.examples.explore.SimpleCacheExplorer
2009-05-27 14:57:55.019/0.294 Oracle Coherence 3.4.2/411 <Info> (thread=main, member=n/a): Loaded operational configuration from resource "jar:file:/home/yzhang/work/coherence/lib/coherence.jar!/tangosol-coherence.xml"
2009-05-27 14:57:55.025/0.300 Oracle Coherence 3.4.2/411 <Info> (thread=main, member=n/a): Loaded operational overrides from resource "jar:file:/home/yzhang/work/coherence/lib/coherence.jar!/tangosol-coherence-override-dev.xml"
2009-05-27 14:57:55.025/0.300 Oracle Coherence 3.4.2/411 <D5> (thread=main, member=n/a): Optional configuration override "/tangosol-coherence-override.xml" is not specified
2009-05-27 14:57:55.031/0.306 Oracle Coherence 3.4.2/411 <D5> (thread=main, member=n/a): Optional configuration override "/custom-mbeans.xml" is not specified
Oracle Coherence Version 3.4.2/411
Grid Edition: Development mode
Copyright (c) 2000-2009 Oracle. All rights reserved.
2009-05-27 14:57:55.260/0.535 Oracle Coherence GE 3.4.2/411 <Info> (thread=main, member=n/a): Loaded cache configuration from file "/home/yzhang/work/coherence/examples/config/explore-config-dist.xml"
2009-05-27 14:57:55.555/0.830 Oracle Coherence GE 3.4.2/411 <Warning> (thread=main, member=n/a): UnicastUdpSocket failed to set receive buffer size to 1428 packets (2096304 bytes); actual size is 178 packets (262144 bytes). Consult your OS documentation regarding increasing the maximum socket buffer size. Proceeding with the actual value may cause sub-optimal performance.
2009-05-27 14:57:55.695/0.970 Oracle Coherence GE 3.4.2/411 <D5> (thread=Cluster, member=n/a): Service Cluster joined the cluster with senior service member n/a
2009-05-27 14:57:58.897/4.172 Oracle Coherence GE 3.4.2/411 <Info> (thread=Cluster, member=n/a): Created a new cluster "cluster:0x2FFB" with Member(Id=1, Timestamp=2009-05-27 14:57:55.564, Address=172.19.174.172:8088, MachineId=4524, Location=site:americas.nokia.com,machine:bsdhcp174172,process:16242, Role=TangosolSimpleCacheExplorer, Edition=Grid Edition, Mode=Development, CpuCount=2, SocketCount=1) UID=0xAC13AEAC00000121836F916C11AC1F98
2009-05-27 14:57:59.062/4.337 Oracle Coherence GE 3.4.2/411 <D5> (thread=DistributedCache, member=1): Service DistributedCache joined the cluster with senior service member 1
2009-05-27 14:57:59.118/4.393 Oracle Coherence GE 3.4.2/411 <Error> (thread=DistributedCache, member=1): BackingMapManager com.tangosol.net.DefaultConfigurableCacheFactory$Manager: failed to instantiate a cache: Yong
2009-05-27 14:57:59.118/4.393 Oracle Coherence GE 3.4.2/411 <Error> (thread=DistributedCache, member=1):
java.lang.IllegalArgumentException: Unknown unit calculator:
<class-scheme>
<class-name>com.tangosol.examples.explore.TestMemoryCalculator</class-name>
</class-scheme>
at com.tangosol.net.DefaultConfigurableCacheFactory.instantiateLocalCache(DefaultConfigurableCacheFactory.java:1641)
at com.tangosol.net.DefaultConfigurableCacheFactory.configureBackingMap(DefaultConfigurableCacheFactory.java:1063)
at com.tangosol.net.DefaultConfigurableCacheFactory.configureBackingMap(DefaultConfigurableCacheFactory.java:1059)
at com.tangosol.net.DefaultConfigurableCacheFactory$Manager.instantiateBackingMap(DefaultConfigurableCacheFactory.java:3124)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$Storage.instantiateResourceMap(DistributedCache.CDB:19)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$Storage.setCacheName(DistributedCache.CDB:27)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$ConfigListener.entryInserted(DistributedCache.CDB:15)
at com.tangosol.util.MapEvent.dispatch(MapEvent.java:191)
at com.tangosol.util.MapEvent.dispatch(MapEvent.java:164)
at com.tangosol.util.MapListenerSupport.fireEvent(MapListenerSupport.java:556)
at com.tangosol.util.ObservableHashMap.dispatchEvent(ObservableHashMap.java:229)
at com.tangosol.util.ObservableHashMap$Entry.onAdd(ObservableHashMap.java:270)
at com.tangosol.util.SafeHashMap.put(SafeHashMap.java:244)
at com.tangosol.coherence.component.util.collections.WrapperMap.put(WrapperMap.CDB:1)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid$ServiceConfigMap.put(Grid.CDB:13)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$StorageIdRequest.onReceived(DistributedCache.CDB:40)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onMessage(Grid.CDB:9)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.CDB:130)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache.onNotify(DistributedCache.CDB:3)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:37)
at java.lang.Thread.run(Thread.java:619)
Of course, if I replaced my TestMemoryCalculator with the SimpleMemoryCalculator coming with coherence, it works. My question is that why my custom unit calculator in this example DOES NOT work? And what part I did it wrong?
Thanks

Hi java8964,
It probably didn't compile because you didn't implement getName() method:
package com.tangosol.examples.explore;
import com.tangosol.net.cache.OldCache;
class TestMemoryCalculator implements OldCache.UnitCalculator
    public TestMemoryCalculator()
    public int calculateUnits(Object oKey, Object oValue)
        int size = 0;
        System.out.println("size = " + size);
        return size;
    public String getName()
        return "TestMemoryCalculator";
    } Regards,
Dimitri

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