/** This method retains both ohOldValue and ohNewValue */
 @Retained(OffHeapIdentifier.TEST_OFF_HEAP_REGION_BASE_LISTENER)
 private void setEventData(EntryEvent e) {
   close();
   EntryEventImpl event = (EntryEventImpl) e;
   this.ohOldValue = event.getOffHeapOldValue();
   this.ohNewValue = event.getOffHeapNewValue();
 }