loadbalancer

type Interface interface {
	// Next returns next item accordingly or nil if none present.
	Next() (item interface{})
	// Skip selecting the given item for a full round. This is useful if the item encountered a temporary failure.
	Skip(item interface{})
	// Add adds a weighted item for selection, if not already present.
	Add(item interface{}, weight int64) (err error)
	// RemoveAll removes all weighted items.
	RemoveAll()
	// The number of items in this instance.
	ItemCount() int
}