/*
 * Copyright (c) 2019. Ants Authors. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package ants

import (
	"errors"
	"time"
)

// errQueueIsFull will be returned when the worker queue is full.
var errQueueIsFull = errors.New("the queue is full")

type worker interface {
	run()
	finish()
	lastUsedTime() time.Time
	setLastUsedTime(t time.Time)
	inputFunc(func())
	inputArg(any)
}

type workerQueue interface {
	len() int
	isEmpty() bool
	insert(worker) error
	detach() worker
	refresh(duration time.Duration) []worker // clean up the stale workers and return them
	reset()
}

type queueType int

const (
	queueTypeStack queueType = 1 << iota
	queueTypeLoopQueue
)

func newWorkerQueue(qType queueType, size int) workerQueue {
	switch qType {
	case queueTypeStack:
		return newWorkerStack(size)
	case queueTypeLoopQueue:
		return newWorkerLoopQueue(size)
	default:
		return newWorkerStack(size)
	}
}