@Override
  public void processMessage(final Message<ID> msg) throws MemberShunnedException {
    // notify failure detection that we've had contact from a member
    services.getHealthMonitor().contactedBy(msg.getSender());
    handleOrDeferMessage(msg);
  }
Returns the identity associated with this member. WARNING: this value will be returned after
the channel is closed, but in that case it is good for logging purposes only. :-)
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/GMSMembership.java