protected boolean allowReplyFromSender() {
    return false;
  }
Override and return true if processor should wait for reply from sender.
<p>
NOTE: the communication layer does not reliably support sending a message to oneself, so other
means must be used to execute the message in this VM. Typically you would set the sender of the
message and then invoke its process() method in another thread.
geode-core/src/main/java/org/apache/geode/distributed/internal/ReplyProcessor21.java