servicediscovery

type Instance struct {
	Address string

	// InUse is true if this instance should be actively used. For example, if a service discovery
	// implementation enforced a max number of instances to be used, this flag will be set to true
	// only on a number of instances up to the configured max.
	InUse bool
}

type Notifications interface {
	// InstanceAdded is called each time a new instance has been discovered.
	InstanceAdded(instance Instance)

	// InstanceRemoved is called each time an instance that was previously notified by AddressAdded()
	// is no longer available.
	InstanceRemoved(instance Instance)

	// InstanceChanged is called each time an instance that was previously notified by AddressAdded()
	// has changed its InUse value.
	InstanceChanged(instance Instance)
}