ValueChangeEventFilter as a CacheFilter

Question

I'm trying to set up a ValueChangeEventFilter as follows:
ValueExtractor ve = new PofExtractor(Integer.class, bop_CompletedJob.IDX_JOBID);
Filter filter = new InFilter(ve,jobIDs);
ve = new PofExtractor(Long.class, bop_CompletedJob.IDX_DataChangedAt);
Filter dataModifiedFilter = new ValueChangeEventFilter(ve);
filter = new AndFilter(filter, dataModifiedFilter);
When I do this, I get the following Exception on the server:
2010-04-06 17:26:07.765/255.770 Oracle Coherence GE 3.5.3/465 <Error> (thread=DistributedCache, member=4): Exception occured during filter evaluation: MapEventFilter(mask=ALL, filter=AndFilter(InFilter(PofExtractor(target=VALUE, navigator=SimplePofPath(indices=0)), [700]), ValueChangeEventFilter(extractor=PofExtractor(target=VALUE, navigator=SimplePofPath(indices=4))))); removing the filter...
2010-04-06 17:26:07.765/255.770 Oracle Coherence GE 3.5.3/465 <Error> (thread=DistributedCache, member=4):
java.lang.UnsupportedOperationException
at com.tangosol.util.filter.ValueChangeEventFilter.evaluateExtracted(ValueChangeEventFilter.java:86)
Is there any issue with using a ValueChangeFilter in this way?
If there's no way to do it using the approach above, I've implemented a custom filter that adds the valueChanged functionality (some null checks are missing...).
     public static class MyMapEventFilter extends MapEventFilter {
          public MyMapEventFilter(int nMask, Filter filter) {
               super(nMask, filter);
          @Override
          public boolean evaluate(Object o) {
               boolean matches = super.evaluate(o);
               if( matches && o instanceof MapEvent ) {
                    MapEvent evt = (MapEvent)o;                    
                    bop_CompletedJob oldVal = (bop_CompletedJob)evt.getOldValue();
                    bop_CompletedJob newVal = (bop_CompletedJob)evt.getNewValue();
                    Date oCompletedAt = oldVal.getCompletedAt();
                    Date nCompletedAt = newVal.getCompletedAt();
                    boolean areDifferent = false;
                    if( nCompletedAt != null ) {
                         areDifferent = !nCompletedAt.equals(oCompletedAt);
                    } else {
                         areDifferent = oCompletedAt == null;
                    return areDifferent;
               } else {
                    s_logger.error("not a MapEvent!");
               return matches;
If the custom MapEventFilter above is what's needed, I can deal with that. But, if I need to take that approach is there some way to leverage POF extractors such that the filter does not need to de-serialize the data on the server?
When I set a break point in the evaluate method, it seems as if the old and new values are already de-serialized.

Answer 1

Hi,
I think the problem is that the ValueChangeEventFilte is expecting an event but since it is wrapped by the MapEventFileter and the AND filter it is receiving an Object. What should work is to wrap the VCEF and the MEF (will wrap the IN filter) with the AND filter.
Please let me know if that is not clear.
Thanks,
-Dave