/FileExtraction/Java_unseen/Uoor_xmu-2016-MrCode/src/com/mrcode/utils/MakeOrderNum.java
package com.mrcode.utils;

import java.text.SimpleDateFormat;
import java.util.Date;

public class MakeOrderNum {
	/** 
     * 锁对象，可以为任意对象 
     */  
    private static Object lockObj = "lockerOrder";  
    /** 
     * 订单号生成计数器 
     */  
    private static long orderNumCount = 0L;  
    /** 
     * 每毫秒生成订单号数量最大值 
     */  
    private static int maxPerMSECSize=1000;  
    /** 
     * 生成非重复订单号，理论上限1毫秒1000个，可扩展 
     * @param tname 测试用 
     */  
    public static String makeOrderNum(String tname) {  
    	// 最终生成的订单号  
    	String finOrderNum = ""; 
        try {  
            synchronized (lockObj) {  
                // 取系统当前时间作为订单号变量前半部分，精确到毫秒  
                long nowLong = Long.parseLong(new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date()));  
                // 计数器到最大值归零，可扩展更大，目前1毫秒处理峰值1000个，1秒100万  
                if (orderNumCount > maxPerMSECSize) {  
                    orderNumCount = 0L;  
                }  
                //组装订单号  
                String countStr=maxPerMSECSize +orderNumCount+"";  
                finOrderNum=String.valueOf(nowLong).substring(2)+countStr.substring(1);  
                orderNumCount++;  
                return finOrderNum;
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }
		return finOrderNum;  
    }  
  
    /*public static void main(String[] args) {  
        // 测试多线程调用订单号生成工具  
        try {  
            for (int i = 0; i < 200; i++) {  
                Thread t1 = new Thread(new Runnable() {  
                    public void run() {  
                    	System.out.println(MakeOrderNum.makeOrderNum(Thread.currentThread().getName()));
                    }  
                }, "at" + i);  
                t1.start();  
  
                Thread t2 = new Thread(new Runnable() {  
                    public void run() {  
                    	System.out.println(MakeOrderNum.makeOrderNum(Thread.currentThread().getName()));
                    }  
                }, "bt" + i);  
                t2.start();  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
  
    }*/  
}
