Delete Coherence Cache entries

To remove the cache entries based on the cache filters...

1. Coherence QueryMap interface provides keySet with filter
   Filter dtfilter = new EqualsFilter("getDate", dt);
   Set kset = cache.keySet(dtfilter );
   for (Object obj : kset) {
     cache.remove(obj);
   }
 
   Cache.remove returns the previous value associated with the key. This is not very efficient.
 
2. Best way to delete the cache entries 
Filter dtfilter = new EqualsFilter("getDate", dt);
this.invokeAll(dtfilter , new ConditionalRemove(AlwaysFilter.INSTANCE));

This code is very efficient and it will not return back any old data.