package domain

import (
	"container/list"
	"sync"
)

type QueueX struct {
	locker  *sync.RWMutex
	dataLst *list.List
}

func NewQueue() *QueueX {
	return &QueueX{
		locker:  new(sync.RWMutex),
		dataLst: list.New(),
	}
}

func (q *QueueX) Push(v interface{}) {
	q.locker.Lock()
	defer q.locker.Unlock()
	q.dataLst.PushBack(v)
}

func (q *QueueX) Pop() interface{} {
	q.locker.Lock()
	defer q.locker.Unlock()
	if e := q.dataLst.Front(); e != nil {
		v := q.dataLst.Remove(e)
		return v
	}
	return nil
}

func (q *QueueX) Empty() bool {
	q.locker.RLock()
	defer q.locker.RUnlock()
	return q.dataLst.Len() == 0
}