@Override
    public void receive(Message msg) {
      byte[] msgBytes = msg.getBuffer();
      if (pingPonger.isPingMessage(msgBytes)) {
        try {
          pingPonger.sendPongMessage(channel, myAddress, msg.getSrc());
        } catch (Exception e) {
          logger.info("Failed sending Pong message to " + msg.getSrc());
        }
      } else if (pingPonger.isPongMessage(msgBytes)) {
        pongReceived(msg.getSrc());
      } else {
        queueMessage(msg);
      }
    }
GMSQuorumChecker is the implementation of QuorumChecker and can be used to determine
whether a quorum of membership is accessible.
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/messenger/GMSQuorumChecker.java