@Override
  protected void process(ClusterDistributionManager dm) {
    final InternalCache cache = dm.getCache();
    if (cache != null) {
      Iterator iterator = messagesList.iterator();
      processRegionQueues(cache, iterator);
    }
  }
Extracts the region from the message list and hands over the message removal task to the
executor
geode-core/src/main/java/org/apache/geode/internal/cache/ha/QueueRemovalMessage.java