stub

type BalancerData struct {
	// ClientConn is set by the builder.
	ClientConn balancer.ClientConn
	// BuildOptions is set by the builder.
	BuildOptions balancer.BuildOptions
	// ChildBalancer holds a child balancer.
	ChildBalancer balancer.Balancer
}

type BalancerFuncs struct {
	// Init is called after ClientConn and BuildOptions are set in
	// BalancerData.  It may be used to initialize BalancerData.Data.
	Init func(*BalancerData)
	// ParseConfig is used for parsing LB configs, if specified.
	ParseConfig func(json.RawMessage) (serviceconfig.LoadBalancingConfig, error)

	UpdateClientConnState func(*BalancerData, balancer.ClientConnState) error
	ResolverError         func(*BalancerData, error)
	Close                 func(*BalancerData)
	ExitIdle              func(*BalancerData)
}