本文章由cartzhang编写。转载请注明出处。 所有权利保留。
文章链接：http://blog.csdn.net/cartzhang/article/details/55051570
作者：cartzhang
simple pool 博客一的地址：
http://blog.csdn.net/cartzhang/article/details/54096845
一、simpe_pool对象池的问题
在上篇对象池simple_pool中提到了它如今的问题。
一个是数据控制，也就是在单个父亲节点下，仅仅会一直增加来满足当前游戏对对象池内的对象数量的须要，没有考虑到降低。也就是说，若在A阶段，游戏场景中同一时候须要大量的某个池内O1对象，这时候就出现大量的AO1对象在内存中。可是过了A阶段，不须要A这么多O1对象时候，对象池内没有做操作和优化。
还有一个问题，就是多线程的问题。这个暂时不这里讨论。
有须要能够自己先对linkedlist加锁。
本片针对第一个问题。来做了处理。
顺便给出上篇simple_pool博客地址：
http://blog.csdn.net/cartzhang/article/details/54096845
https://github.com/cartzhang/simple_pool_bench
二、对象池内数量优化思路
本着在后台处理，尽量少影响对象池的使用的原则。决定使用在增加一个线程来实现。对须要清理的池内对象进行记录和推断。然后在主线程中进行删除（destroy）操作.
由于Unity不同意在其它自己建立的线程中调用Destroy函数，所以还是要在Update中进行处理。
这个是自己画的流程图，基本就是这个样子。当然里面详细參数，能够依据自己须要调整。
三、实现代码
1.首先，建立垃圾清理标记和垃圾对象列表。
// garbage clean.
private static bool clearGarbageFlag = false;
private static List<Transform> GarbageList = new List<Transform>(100);
然后标记为真。開始清理。
这里进行了加锁，避免一边删除。一边增加，这样造成野的对象。垃圾表被清空了，对象也不在对象池内列表中。
2.主线程的清理工作
private void Update()
{
CleanGarbageList();
}
private void CleanGarbageList()
{
if (clearGarbageFlag)
{
clearGarbageFlag = false;
lock (GarbageList)
{
Debug.Assert(GarbageList.Count > 0);
Debug.Log("now destroy " + GarbageList.Count + " from pool" + GarbageList[0].name);
for (int i = 0; i < GarbageList.Count; i++)
{
Destroy(GarbageList[i].gameObject);
}
GarbageList.Clear();
}
}
}
3.优化线程启动
线程在第一次调用池的时候開始启动。
然后定时检測数量，每轮会检測checkTimesForEach个对象池内的未使用的情况。对象池个数超出的部分，等待5个中的一个多次检測没有异常后，在增加到检測中，这个主要是为了防止多个对象池内，一次性增加垃圾列表中太多对象。须要一次性删掉的太多，造成主线程卡顿的情况。
当然这也不是最理想的，为了防止卡顿。每次检測循环仅仅检測到一个满足垃圾清理条件，须要处理就会停止检測跳出循环，然后进行垃圾处理。这个也是为了轻量级的删减措施。
一旦成功设置标志。就又一次计算和检測。而且在设置后，优化线程等待1秒时间，来让主线程做工作。这个时间应该是非常充裕的。
主要代码
private static void OptimizationPool()
{
// check cpu time to start
Thread.Sleep(100);
// 检測间隔时间20秒
float intervalTimeTodetect = 20f;
// after how many times counts to reset count.
// 循环检測多少次。后记录清零。每次仅仅处理须要处理的前5个池。
const int checkTimesForEach = 5;
// 暂时池管理对象
Dictionary<int, ObjectPool> poolManagerTempDic = new Dictionary<int, ObjectPool>();
System.DateTime timeCount = System.DateTime.Now;
// 间隔时间内运行一次
bool eachMinuteGetDicOnce = false;
// 每一个池未使用对象超过一半的标记，记录次数
Dictionary<int, int> CurrentPoolUnuseCount = new Dictionary<int, int>();
// 检測刷新次数。也是一次计数的最大时间。
int icountLoopTime = 0;
Debug.Log("Thread start");
// 休眠时间
int sleepTime = 10;
while (isStartThread)
{
Thread.Sleep(sleepTime);
if (!eachMinuteGetDicOnce)
{
eachMinuteGetDicOnce = true;
poolManagerTempDic = poolManagerDic.ToDictionary(entry => entry.Key,entry => entry.Value);
// loop check 3 time to reset.
if (icountLoopTime % checkTimesForEach == 0)
{
CurrentPoolUnuseCount.Clear();
icountLoopTime = icountLoopTime > 10000000 ? 0 : icountLoopTime;
}
// mark unuse nuber for all.
foreach(var element in poolManagerTempDic)
{
ObjectPool opool = element.Value;
int unusinglinkCount = opool.UnusingLinkedList.Count;
// half of all is useless and more than 10.
if (unusinglinkCount * 2 > unusinglinkCount + opool.UsingLinkedList.Count && unusinglinkCount > 10)
{
MarkCountForUnusingLink(ref CurrentPoolUnuseCount, element.Key);
// satisfy the condition,add unusing link gameobject to garbagelist.
int currentMark = 0;
CurrentPoolUnuseCount.TryGetValue(element.Key,out currentMark);
// be marked three times, add to garbage list.
if (currentMark >= 3)
{
AddObjectsToGarbageList(ref opool.UnusingLinkedList);
// count tick to reset.
CurrentPoolUnuseCount[element.Key] = 0;
clearGarbageFlag = true;
// each time only gathing one pool to process.
break;
}
}
}
}
// leave time for mainthread to delete gameobjects.
if (clearGarbageFlag)
{
icountLoopTime = 0;
intervalTimeTodetect = 20f;
Thread.Sleep(1000);
timeCount = System.DateTime.Now;
}
// interval 20 seconds to start check once;
if ((System.DateTime.Now - timeCount).TotalSeconds > intervalTimeTodetect)
{
timeCount = System.DateTime.Now;
eachMinuteGetDicOnce = false;
poolManagerTempDic.Clear();
icountLoopTime++;
Debug.Log("Loop count is " + icountLoopTime);
}
// long time nothing happen, expand the detective interval time (max <= 90s).
if (icountLoopTime >= 4 )
{
intervalTimeTodetect = intervalTimeTodetect * 2 >= 90f ? 90f : intervalTimeTodetect * 2;
icountLoopTime = 0;
Debug.Log("interval time is " + intervalTimeTodetect);
}
}
return;
}
/// <summary>
/// add last gameobject to garbagelist,as when unsing unusinglink is from first place to get.
/// </summary>
/// <param name="list"></param>
private static void AddObjectsToGarbageList(ref LinkedList<Transform> list)
{
Debug.Assert(list.Count > 0);
int FlagDestroyNumber = list.Count>>1;
for (int i = 0; i < FlagDestroyNumber; i++)
{
GarbageList.Add(list.Last.Value);
list.RemoveLast();
}
}
依照眼下设置參数，開始检測的时间间隔为20秒，若20*2=40秒后，没有须要处理的垃圾，就把检測时间间隔翻倍为40秒检測一次；若在过40*4=160秒，没有触发标志。检測时间进一步延长，逐次翻倍增加。可是最大值为90秒。
也就是说。最大的检測间隔为90秒。
若中间被打断。所有归为正常20秒检測一次。
触发增加垃圾列表的条件：
设置触发标志是一个池，在3次检測中都有超过一半的对象没有被使用，而且总体未使用数量超过10个。
四、更新project分享地址：
地址：https://github.com/cartzhang/simple_pool_bench
能够下载Assets文件。然后用unity測试。
这个測试demo为 PoolTimeOptimizeOjbectsDemo.unity。
优化流程图下载地址：
https://github.com/cartzhang/simple_pool_bench/blob/master/img/pool_bench_optimize.png
若有问题，请提交问题或代码。非常感谢！
。！
五、附件
poolManager.cs 所有代码：
using UnityEngine;
using System.Collections.Generic;
using SLQJ_POOL;
using UnityEngine.Internal;
using System.Threading;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Linq;
/// <summary>
/// 扩展GameObject函数
/// 使用扩展函数方面代码调用，能够Unity的随意代码中，调用对象池来产生和回池对象，
/// 而且不须要调用命名空间等繁琐东西。
/// 代码样例： obj = gameObject.InstantiateFromPool(prefab);
/// gameObject.DestroyToPool(poolObjs[poolObjs.Count - 1], 0.2f);
/// 详细能够參考HowToUse脚本和TestEffect。
/// @cartzhang
/// </summary>
public static class GameObjectExten
{
/// <summary>
/// 调用对象池，产生一对象，并带有位置和旋转等參考
/// </summary>
/// <param name="gameobject"></param>
/// <param name="original"></param>
/// <param name="position"></param>
/// <param name="rotation"></param>
/// <returns></returns>
public static GameObject InstantiateFromPool(this GameObject gameobject, Object original, Vector3 position, Quaternion rotation)
{
return PoolManager.PullObjcetFromPool(original as GameObject, position, rotation).gameObject;
}
/// <summary>
/// 调用对象池，产生对象
/// </summary>
/// <param name="gameobject"></param>
/// <param name="original"></param>
/// <returns></returns>
public static GameObject InstantiateFromPool(this GameObject gameobject, Object original)
{
return PoolManager.PullObjcetFromPool(original as GameObject).gameObject;
}
/// <summary>
/// 对象返回对象池
/// </summary>
/// <param name="gameobject"></param>
/// <param name="obj"></param>
public static void DestroyToPool(this GameObject gameobject, Object obj)
{
PoolManager.PushObjectPool((obj as GameObject).transform);
}
/// <summary>
/// 带延时的返回对象池
/// </summary>
/// <param name="gameobject"></param>
/// <param name="obj"></param>
/// <param name="t"></param>
public static void DestroyToPool(this GameObject gameobject, Object obj, [DefaultValue("0.0F")] float t)
{
PoolManager.PushObjectPool((obj as GameObject).transform, t);
}
}
namespace SLQJ_POOL
{
public class PoolManager : MonoBehaviour
{
private static PoolManager instance;
private static bool bStartThreadOnce = false;
private static bool isStartThread = false;
private static Thread tOptimizationThread;
private static List<GameObject> prefabList = new List<GameObject>();
//存放预制体相应的id。ObjcetPool
public static Dictionary<int, ObjectPool> poolManagerDic = new Dictionary<int, ObjectPool>();
private static Dictionary<Transform, ObjectPool> transformDic = new Dictionary<Transform, ObjectPool>();
// garbage clean.
private static bool clearGarbageFlag = false;
private static List<Transform> GarbageList = new List<Transform>(100);
private void Update()
{
CleanGarbageList();
}
private void CleanGarbageList()
{
if (clearGarbageFlag)
{
clearGarbageFlag = false;
lock (GarbageList)
{
Debug.Assert(GarbageList.Count > 0);
Debug.Log("now destroy " + GarbageList.Count + " from pool" + GarbageList[0].name);
for (int i = 0; i < GarbageList.Count; i++)
{
Destroy(GarbageList[i].gameObject);
}
GarbageList.Clear();
}
}
}
//初始化某个预制体相应的对象池
public static void InitPrefab(GameObject prefab, int initNum = 4)
{
GetObjectPool(prefab, initNum);
}
//外界调用的接口
public static Transform PullObjcetFromPool(GameObject prefab)
{
return _PullObjcetFromPool(prefab);
}
public static Transform PullObjcetFromPool(GameObject prefab, Vector3 pos, Quaternion quaternion)
{
return _PullObjcetFromPool(prefab, pos, quaternion);
}
private static Transform _PullObjcetFromPool(GameObject prefab)
{
if (prefab == null)
{
Debug.Log("prefab is null!");
return null;
}
ObjectPool objPool = GetObjectPool(prefab);
StartThreadOnce();
return objPool.PullObjcetFromPool();
}
private static Transform _PullObjcetFromPool(GameObject prefab, Vector3 pos, Quaternion quaternion)
{
if (prefab == null)
{
Debug.Log("prefab is null!");
return null;
}
ObjectPool objPool = GetObjectPool(prefab, pos, quaternion);
StartThreadOnce();
return objPool.PullObjcetFromPool(pos, quaternion);
}
private static ObjectPool GetObjectPool(GameObject prefab, int initNum = 4)
{
ObjectPool objPool = null;
//推断集合中是否有预制体相应的对象池
int leng = prefabList.Count;
int prefabID = prefab.GetInstanceID();
for (int i = 0; i < leng; i++)
{
if (prefabID == prefabList[i].GetInstanceID())
{
objPool = poolManagerDic[prefabID];
break;
}
}
//没有找到对象池的话创建一个对象池
if (objPool == null)
{
objPool = CreatObjcetPool(prefab, initNum);
}
return objPool;
}
private static ObjectPool GetObjectPool(GameObject prefab, Vector3 pos, Quaternion qua, int initNum = 4)
{
ObjectPool objPool = null;
int leng = prefabList.Count;
int prefabID = prefab.GetInstanceID();
for (int i = 0; i < leng; i++)
{
if (prefabID == prefabList[i].GetInstanceID())
{
objPool = poolManagerDic[prefabID];
}
}
if (objPool == null)
{
objPool = CreatObjcetPool(prefab, pos, qua, initNum);
}
return objPool;
}
private static ObjectPool CreatObjcetPool(GameObject prefab, Vector3 pos, Quaternion qua, int initNum)
{
prefabList.Add(prefab);
GameObject go = new GameObject();
go.name = prefab.name + "Pool";
ObjectPool objPool = go.AddComponent<ObjectPool>();
objPool.InitObjectPool(prefab, pos, qua, transformDic, initNum);
poolManagerDic.Add(prefab.GetInstanceID(), objPool);
return objPool;
}
private static ObjectPool CreatObjcetPool(GameObject prefab, int initNum)
{
prefabList.Add(prefab);
GameObject go = new GameObject();
go.name = prefab.name + "Pool";
ObjectPool objPool = go.AddComponent<ObjectPool>();
objPool.InitObjectPool(prefab, transformDic, initNum);
poolManagerDic.Add(prefab.GetInstanceID(), objPool);
return objPool;
}
public static void PushObjectPool(Transform handleTransform)
{
ObjectPool objPool = GetPoolByTransform(handleTransform);
if (objPool)
{
objPool.PushObjectToPool(handleTransform);
}
else
{
GameObject.Destroy(handleTransform.gameObject);
}
}
public static void PushObjectPool(Transform handleTransform, float delayTime)
{
ObjectPool objPool = GetPoolByTransform(handleTransform);
if (objPool)
{
objPool.PushObjectToPool(handleTransform, delayTime);
}
else
{
GameObject.Destroy(handleTransform.gameObject, delayTime);
}
}
//马上回池的接口
public static void PushObjectPool(Transform handleTransform, GameObject prefab)
{
ObjectPool objPool = GetObjectPool(prefab);
objPool.PushObjectToPool(handleTransform.transform);
}
//延迟回池的接口
public static void PushObjectPool(Transform handleTransform, GameObject prefab, float delayTime)
{
ObjectPool objPool = GetObjectPool(prefab);
objPool.PushObjectToPool(handleTransform, delayTime);
}
private static ObjectPool GetPoolByTransform(Transform handleTransform)
{
if (transformDic.ContainsKey(handleTransform))
{
return transformDic[handleTransform];
}
Debug.LogError(handleTransform.name + " no find it's ObjectPool");
return null;
}
// add code to clean pool from time to time.
private static void StartThreadOnce()
{
// start thread to clean pool from time to time.
if (!bStartThreadOnce)
{
bStartThreadOnce = true;
ThreadPool.QueueUserWorkItem(AutoToCheckOptimization);
}
}
private static void AutoToCheckOptimization(object obj)
{
Thread.Sleep(10);
isStartThread = true;
tOptimizationThread = new Thread(OptimizationPool);
tOptimizationThread.Start();
}
private static void OptimizationPool()
{
// check cpu time to start
Thread.Sleep(100);
// 检測间隔时间20秒
float intervalTimeTodetect = 20f;
// after how many times counts to reset count.
// 循环检測多少次，后记录清零。每次仅仅处理须要处理的前5个池。
const int checkTimesForEach = 5;
// 暂时池管理对象
Dictionary<int, ObjectPool> poolManagerTempDic = new Dictionary<int, ObjectPool>();
System.DateTime timeCount = System.DateTime.Now;
// 间隔时间内运行一次
bool eachMinuteGetDicOnce = false;
// 每一个池未使用对象超过一半的标记，记录次数
Dictionary<int, int> CurrentPoolUnuseCount = new Dictionary<int, int>();
// 检測刷新次数。也是一次计数的最大时间。
int icountLoopTime = 0;
Debug.Log("Thread start");
// 休眠时间
int sleepTime = 10;
while (isStartThread)
{
Thread.Sleep(sleepTime);
if (!eachMinuteGetDicOnce)
{
eachMinuteGetDicOnce = true;
poolManagerTempDic = poolManagerDic.ToDictionary(entry => entry.Key,entry => entry.Value);
// loop check 3 time to reset.
if (icountLoopTime % checkTimesForEach == 0)
{
CurrentPoolUnuseCount.Clear();
icountLoopTime = icountLoopTime > 10000000 ? 0 : icountLoopTime;
}
// mark unuse nuber for all.
foreach(var element in poolManagerTempDic)
{
ObjectPool opool = element.Value;
int unusinglinkCount = opool.UnusingLinkedList.Count;
// half of all is useless and more than 10.
if (unusinglinkCount * 2 > unusinglinkCount + opool.UsingLinkedList.Count && unusinglinkCount > 10)
{
MarkCountForUnusingLink(ref CurrentPoolUnuseCount, element.Key);
// satisfy the condition,add unusing link gameobject to garbagelist.
int currentMark = 0;
CurrentPoolUnuseCount.TryGetValue(element.Key,out currentMark);
// be marked three times, add to garbage list.
if (currentMark >= 3)
{
AddObjectsToGarbageList(ref opool.UnusingLinkedList);
// count tick to reset.
CurrentPoolUnuseCount[element.Key] = 0;
clearGarbageFlag = true;
// each time only gathing one pool to process.
break;
}
}
}
}
// leave time for mainthread to delete gameobjects.
if (clearGarbageFlag)
{
icountLoopTime = 0;
intervalTimeTodetect = 20f;
Thread.Sleep(1000);
timeCount = System.DateTime.Now;
}
// interval 20 seconds to start check once;
if ((System.DateTime.Now - timeCount).TotalSeconds > intervalTimeTodetect)
{
timeCount = System.DateTime.Now;
eachMinuteGetDicOnce = false;
poolManagerTempDic.Clear();
icountLoopTime++;
Debug.Log("Loop count is " + icountLoopTime);
}
// long time nothing happen, expand the detective interval time (max <= 90s).
if (icountLoopTime >= 4 )
{
intervalTimeTodetect = intervalTimeTodetect * 2 >= 90f ? 90f : intervalTimeTodetect * 2;
icountLoopTime = 0;
Debug.Log("interval time is " + intervalTimeTodetect);
}
}
return;
}
private static void MarkCountForUnusingLink(ref Dictionary<int, int> poolUnuseCount,int prefabGuid)
{
Debug.Assert(null != poolManagerDic);
int currentMark = 0;
if (poolUnuseCount.ContainsKey(prefabGuid))
{
poolUnuseCount.TryGetValue(prefabGuid, out currentMark);
}
currentMark++;
if (poolUnuseCount.ContainsKey(prefabGuid))
{
poolUnuseCount[prefabGuid] = currentMark;
}
else
{
poolUnuseCount.Add(prefabGuid, currentMark);
}
}
/// <summary>
/// add last gameobject to garbagelist,as when unsing unusinglink is from first place to get.
/// </summary>
/// <param name="list"></param>
private static void AddObjectsToGarbageList(ref LinkedList<Transform> list)
{
Debug.Assert(list.Count > 0);
int FlagDestroyNumber = list.Count>>1;
for (int i = 0; i < FlagDestroyNumber; i++)
{
GarbageList.Add(list.Last.Value);
list.RemoveLast();
}
}
public void Dispose()
{
isStartThread = false;
}
}
}