public boolean useSSL() {
    return socketCreator.useSSL();
  }
ClusterSocketCreatorImpl is constructed and held by a TcpSocketCreator. It is
accessed through the method {@link TcpSocketCreator#forCluster()}.
geode-tcp-server/src/main/java/org/apache/geode/distributed/internal/tcpserver/ClusterSocketCreatorImpl.java