Unity中的引用计数器（RefCount）

你的名字 2021-09-18 09:06 494阅读 0赞

# 引用计数使用场景： #

有一间黑色的屋子，里边有一盏灯。当第一个人进屋的时候灯会打开，之后进来的人则不用再次打开了，因为已经打开过了。当屋子里所有人都离开了的时候，灯则会关闭。

引用计数器工具 ：

namespace QFramework
    {
        public interface IRefCount
        {
            int RefCount { get; }
            void Retain(object refOwner = null);
            void Release(object refOwner = null);
        }
        public class SimpleRC : IRefCount
        {
            public int RefCount { get; private set; }
    
            public void Retain(object refOwner = null)
            {
                RefCount++;
            }
    
            public void Release(object refOwner = null)
            {
                RefCount--;
                if(RefCount == 0)
                {
                    OnZeroRef();
                }
            }
            
            protected virtual void OnZeroRef()
            {
    
            }
        }
    }

举例实现：

using UnityEngine;
    namespace QFramework
    {
        public class SimpleRCExample : MonoBehaviour
        {
    #if UNITY_EDITOR
            [UnityEditor.MenuItem("QFramework/Example/22.SimpleRCExample", false, 22)]
            static void MenuClick()
            {
                var room = new Room();
    
                room.EnterPeople();
                room.EnterPeople();
                room.EnterPeople();
    
                room.LeavePeople();
                room.LeavePeople();
                room.LeavePeople();
    
                room.EnterPeople(); 
            }
    #endif
    
            class Light
            {
                public void Open()
                {
                    Debug.Log("灯打开了");
                }
                public void Close()
                {
                    Debug.Log("灯关闭了");
                }
            }
    
            class Room:SimpleRC 
            {
                Light mLight = new Light();
    
                public void EnterPeople()
                {
                    if (RefCount == 0)
                    {
                        mLight.Open();
                    }
                    Retain();
                    Debug.LogFormat("一个人进入房间，当前房间有{0}个人", RefCount);
                }
    
                public void LeavePeople()
                {
                    Release();
    
                    Debug.LogFormat("一个人离开房间，当前房间有{0}个人", RefCount);
                }
    
                protected override void OnZeroRef()
                {
                    mLight.Close();
                }
            }
        }
    }

运行结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70]: /images/20210725/dc35c1733d234638bf708b829a43f6b9.png