ds

type NamespacedCache interface {
	Len(namespace string) int
	Namespaces() []string
	Get(namespace string, key string) (interface{}, bool)
	Set(namespace string, key string, value interface{})
	Range(namespace string, f func(key string, value interface{}) bool)
	Delete(namespace string, key string)
	Exists(namespace string, key string) bool
	Clear(namespace string)
	Close()
}

type Queue interface {
	Enqueue(val interface{})
	Dequeue() (interface{}, bool)
	IsEmpty() bool
	Len() int
	Range(fn func(element interface{}) bool)
}

type Stack interface {
	Pop() (interface{}, bool)
	Push(f interface{})
	Range(fn func(element interface{}) bool)
	IsEmpty() bool
	Len() int
}