@Override
  protected void registerEventDroppedInPrimaryQueue(EntryEventImpl droppedEvent) {
    logger.info("ParallelGatewaySenderEventProcessor should not process dropped event {}",
        droppedEvent);
  }
use in concurrent scenario where queue is to be shared among all the processors.
geode-core/src/main/java/org/apache/geode/internal/cache/wan/parallel/ParallelGatewaySenderEventProcessor.java