public class Pool : MonoBehaviour
    {
        public List<GameObject> PoolObjects = new List<GameObject>();
        public GameObject Instance;
        public void Init(int instanceCount, GameObject instance){
            for(int i = 0; i < instanceCount; i++){
                GameObject _instance = GameObject.Instantiate(instance) as GameObject;
                _instance.transform.SetParent(Utils.Global.Arena, false);
                _instance.SetActive(false);
                PoolObjects.Add(_instance);
            }
            Instance = instance;
        }
        public GameObject GetObject(){
            if(PoolObjects.Count > 0) {
                GameObject _instance = PoolObjects[PoolObjects.Count - 1] as GameObject;
                PoolObjects.Remove(PoolObjects[PoolObjects.Count - 1]);
                _instance.SetActive(true);
                return _instance;
            }
            else{
                GameObject _instance = GameObject.Instantiate(Instance) as GameObject;
                _instance.transform.SetParent(Utils.Global.Arena, false);
                _instance.SetActive(true);
                return _instance;
            }
        }
        public void ReturnObject(GameObject instance){
            instance.SetActive(false);
            PoolObjects.Add(instance);
        }
    }

public class NotificationMarker : Marker, INotification
{
   public PropertyName id { get; }
}