My Pool

pool.js

module.exports = {
	create:function(){
		return {
			poolLength:0,
			free:[],
			getId:function(){
				var id;
				if(this.free.length == 0){
					id = ++this.poolLength;
				}
				else {
					id = this.free.pop();
				}
				return id;
			},
			freeId:function(id){
				this.free.push(id);
			},
			restart:function(){
				this.free=[];
				this.poolLength=0;
			}
		};
	};
}