func NewServer(registrar tchannel.Registrar) *Server {
	metaHandler := newMetaHandler()
	server := &Server{
		ch:          registrar,
		log:         registrar.Logger(),
		handlers:    make(map[string]handler),
		metaHandler: metaHandler,
		ctxFn:       defaultContextFn,
	}
	server.Register(newTChanMetaServer(metaHandler))
	if ch, ok := registrar.(*tchannel.Channel); ok {
		// Register the meta endpoints on the "tchannel" service name.
		NewServer(ch.GetSubChannel("tchannel"))
	}
	return server
}
func NewServer(registrar tchannel.Registrar) *Server {
	metaHandler := newMetaHandler()
	server := &Server{
		ch:          registrar,
		log:         registrar.Logger(),
		handlers:    make(map[string]handler),
		metaHandler: metaHandler,
		ctxFn:       defaultContextFn,
	}
	server.Register(newTChanMetaServer(metaHandler))
	if ch, ok := registrar.(*tchannel.Channel); ok {
		// Register the meta endpoints on the "tchannel" service name.
		NewServer(ch.GetSubChannel("tchannel"))
	}
	return server
}
// NewServer returns a server that can serve thrift services over TChannel.