Egret中的对象池Pool

为了可以让对象复用，防止大量重复创建对象，导致资源浪费，使用对象池来管理。

 

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/**  * 对象池  * @author chenkai 2019.10.25  */ class Pool {     private static poolMap = {};       /**      * 根据签名获取对象      * @param sign 签名      * @param clz 类名，对象池空，则根据类名创建新对象      */     public static getItemBySign(sign:string,clz:any){         let pool = (this.poolMap[sign] || (this.poolMap[sign] = []));         if (pool.length) {             return pool.pop();         }         let obj: any = new clz();         obj.poolKey = sign;         return obj;     }           /**      * 获取对象      * @param clz 对象类名      * @param args      */     public static getItemByClass(clz: any) {         let clzName = clz.prototype["__class__"];         return this.getItemBySign(clzName, clz);     }       /**      * 根据签名回收对象      * @param sign 签名      * @param ins 对象实例      */     public static recoverBySign(sign:string, ins:any){         this.poolMap[sign] && this.poolMap[sign].push(ins);     }       /**      * 回收对象      * @param ins 对象实例      */     public static recoverByIns(ins: any) {         this.recoverBySign(ins.poolKey, ins);     }       /**      * 根据签名清理对象      * @param sign 签名      */     public static clearBySign(sign:string){         let pool = this.poolMap[sign];         if(pool){             let len = pool.length;             for(let i=0;i<len;i++){                 pool[i].destroy && pool[i].destroy();             }             pool.length = 0;             delete this.poolMap[sign];         }     }       /**      * 清理对象。对象会执行destroy。      * @param clz 对象类名      */     public static clearByClass(clz: any) {         let clzName = clz.prototype["__class__"];         this.clearBySign(clzName);     }               /**清理所有对象 */     public static clearAll(){         for(let key in this.poolMap){            this.clearBySign(key);         }     }   }

　　

 

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//获取一个Ball let ball:Ball = Pool.getItemByClass(Ball);   //回收一个Ball Pool.recoverByIns(ball);

　

 

以下是Laya的对象池源码，可以参考学习下

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/** *<p> <code>Pool</code> 是对象池类，用于对象的存贮、重复使用。</p> *<p>合理使用对象池，可以有效减少对象创建的开销，避免频繁的垃圾回收，从而优化游戏流畅度。</p> */ //class laya.utils.Pool var Pool=(function(){     function Pool(){}     __class(Pool,'laya.utils.Pool');     Pool.getPoolBySign=function(sign){         return Pool._poolDic[sign] || (Pool._poolDic[sign]=[]);     }        Pool.clearBySign=function(sign){         if (Pool._poolDic[sign])Pool._poolDic[sign].length=0;     }        Pool.recover=function(sign,item){         if (item["__InPool"])return;         item["__InPool"]=true;         Pool.getPoolBySign(sign).push(item);     }        Pool.getItemByClass=function(sign,cls){         var pool=Pool.getPoolBySign(sign);         var rst=pool.length ? pool.pop():new cls();         rst["__InPool"]=false;         return rst;     }        Pool.getItemByCreateFun=function(sign,createFun){         var pool=Pool.getPoolBySign(sign);         var rst=pool.length ? pool.pop():createFun();         rst["__InPool"]=false;         return rst;     }        Pool.getItem=function(sign){         var pool=Pool.getPoolBySign(sign);         var rst=pool.length ? pool.pop():null;         if (rst){             rst["__InPool"]=false;         }         return rst;     }        Pool._poolDic={};     Pool.InPoolSign="__InPool";     return Pool; })()