QueuePool for Unity

/*
 * This work by Jason "Aj" Comfort (https://weirdbearddev.com) is licensed under
 * CC BY-SA 4.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/4.0
*/

using System.Collections.Generic;
using UnityEngine;

namespace SpaceMonkeys.Core
{
    public class QueuePool : MonoBehaviour
    {
        #region Members
        [SerializeField] private GameObject _prefab = default;
        [SerializeField] private Queue<GameObject> _pool = default;
        [SerializeField] private int _poolSize = 10;

        private const int _increaseWhenEmpty = 10;
        #endregion Members

        #region MonoBehaviours
        void Awake() => GeneratePool();
        #endregion MonoBehaviours

        #region Methods
        /// <summary>
        /// Gets the first item from the queue.  The position and rotation are equal to QueuePool's, and it is active.
        /// </summary>
        /// <returns>The GameObject from the QueuePool.</returns>
        public GameObject Request()
        {
            if (_pool.Count > 0)
            {
                GameObject item = _pool.Dequeue();
                item.transform.SetPositionAndRotation(transform.position, transform.rotation);
                item.SetActive(true);
                return item;
            }
            else
            {
                IncreasePool(_increaseWhenEmpty);
                return Request();
            }
        }
        public void Return(GameObject item)
        {
            item.SetActive(false);
            item.transform.SetPositionAndRotation(transform.position, transform.rotation);
            if (!_pool.Contains(item))
                _pool.Enqueue(item);
        }
        #endregion Methods

        #region Helpers
        private void GeneratePool()
        {
            _pool = new Queue<GameObject>(_poolSize);
            AddItems(_poolSize);
        }
        private void IncreasePool(int amount)
        {
            _poolSize += amount;
            AddItems(amount);
        }
        private void AddItems(int amount)
        {
            for (int i = 0; i < amount; i++)
            {
                GameObject p = Instantiate(_prefab, transform);
                p.name = $"{p.name}-{i}";
                p.SetActive(false);
                if (!_pool.Contains(p))
                    _pool.Enqueue(p);
            }
        }
        #endregion Helpers
    }
}