java订单超时自动关闭

使用延时队列DelayQueue实现订单超时自动关闭
DelayQueue 是一个线程安全的队列。可以实现异步操作

首先创建一个订单实体类

@Getter
@Setter
public class OrderInfo implements Serializable , Delayed
{
    private static final long serialVersionUID = 1L;
    private String orderNo;// 订单号
    private Integer status;// 订单状态
    private String expTime;// 订单过期时间
    private String createTime;//订单创建时间

    /**
     * 用于延时队列内部比较排序：当前订单的过期时间 与 队列中对象的过期时间 比较
     */
    @Override
    public int compareTo(Delayed o) {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        long nowThreadtime = 0;
        long queueThreadtime = 0;
        try {
            nowThreadtime = formatter.parse(this.expTime).getTime();
            queueThreadtime = formatter.parse(((OrderInfo)o).expTime).getTime();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return Long.valueOf(nowThreadtime).compareTo(Long.valueOf(queueThreadtime));
    }

    /**
     * 时间单位：秒
     * 延迟关闭时间 = 过期时间 - 当前时间
     */
    @Override
    public long getDelay(TimeUnit unit) {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        long time = 0;
        try {
            time = formatter.parse(this.expTime).getTime();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return time - System.currentTimeMillis();
    }
}

下面实现队列移除超市订单

/**
 * [使用延时队列DelayQueue实现订单超时关闭]
 * [后台守护线程不断的执行检测工作]
 * [双检查模式实现单例模式]
 */
@Component
public class OrderOverTimeClose
{
    private volatile static OrderOverTimeClose oderOverTimeClose = null;
	
	//我这里是一个商品订单实体类
    private GoodsOrderRepository goodsOrderRepository;

    private OrderOverTimeClose() {
        this.goodsOrderRepository = ApplicationContextProvider.getBean(GoodsOrderRepository.class);
    }
    /**
     * 单例模式，双检查锁模式，在并发环境下对象只被初始化一次
     */
    public static OrderOverTimeClose getInstance(){
        if(oderOverTimeClose == null ){
            synchronized(OrderOverTimeClose.class){
                oderOverTimeClose =  new OrderOverTimeClose();
            }
        }
        return oderOverTimeClose;
    }

    /**
     * 守护线程
     */
    private Thread mainThread;

    /**
     * 启动方法
     */
    public void init(){
        /**初始化时加载数据库中需处理超时的订单**/
        //循环订单 获取状态 调用orderPutQueue();
        // 创建初始订单
        long createTime = System.currentTimeMillis();
        String currentTime = OrderPay.getTime(createTime);
        String overTime = OrderPay.getTime(createTime + 1800000);// 三十分钟后超时 10000毫秒=10秒
        //启动的时候找到需要的订单信息
        List<GoodsOrder> goodsOrders = goodsOrderRepository.findBy("status","1");
        //循环订单信息 把需要的信息 放进队列的实体类
        goodsOrders.forEach((info)->{
            OrderInfo orderInfo = new OrderInfo();
            orderInfo.setOrderNo(info.getOrderNum());
            orderInfo.setStatus(info.getStatus());
            orderInfo.setCreateTime(currentTime);
            orderInfo.setExpTime(overTime);
            orderPutQueue(orderInfo,currentTime,overTime);
        });
        mainThread =  new Thread(() -> execute());
        mainThread.setDaemon(true);
        mainThread.setName("守护线程-->");
        mainThread.start();
    }

    /**
     * 创建空延时队列
     */
    private DelayQueue<OrderInfo> queue = new DelayQueue<OrderInfo>();

    /**
     * 读取延时队列，关闭超时订单
     */
    private void execute() {
        while (true) {
            try {
                if(queue.size() > 0){
                    //从队列里获取超时的订单
                    OrderInfo orderInfo = queue.take();
                    // 检查订单状态，是否已经成功，成功则将订单从队列中删除。
                    if (orderInfo.getStatus()>1) {
                        System.out.println("线程："+Thread.currentThread().getName()+"，订单号："
                                + orderInfo.getOrderNo() + "，订单状态："
                                + orderInfo.getStatus() + "，订单创建时间："
                                + orderInfo.getCreateTime()
                                + "，订单超时时间：" + orderInfo.getExpTime()+"，当前时间："+OrderPay.getTime(System.currentTimeMillis()));
                        orderRemoveQueue(orderInfo);
                        System.out.println("订单已成功 移除掉"+orderInfo.getOrderNo());
                        Thread.sleep(2000);
                    } else {
						//这里是超时的订单 把超时的订单状态改为取消                        
						GoodsOrderRepository goodsOrderRepository = ApplicationContextProvider.getBean(GoodsOrderRepository.class);
                        GoodsOrder goodsOrder = goodsOrderRepository.findOneBy("orderNum",orderInfo.getOrderNo());
                        if( goodsOrder!=null && goodsOrder.getStatus()<=1 )
                        {
                            goodsOrder.setStatus(GoodsOrder.orderType.cancelOrder);//取消订单
                            goodsOrder.setCancelTime(new Date());
                            goodsOrderRepository.saveOrUpdate(goodsOrder);
                        }else
                        {
                            orderRemoveQueue(orderInfo);
                            System.out.println("订单已成功 移除掉"+orderInfo.getOrderNo());
                        }
                        System.out.println("线程："+Thread.currentThread().getName()+"，订单号："
                                + orderInfo.getOrderNo() + "，变更订单状态为：超时关闭"
                                + "，订单创建时间："
                                + orderInfo.getCreateTime()
                                + "，订单超时时间：" + orderInfo.getExpTime()+"，当前时间："+OrderPay.getTime(System.currentTimeMillis()));
                        Thread.sleep(2000);
                    }
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 插入订单到超时队列中
     */
    public void orderPutQueue(OrderInfo orderInfo, String createTime,
                              String overTime) {
        System.out.println("订单号：" + orderInfo.getOrderNo() + "，订单创建时间："
                + createTime + "，订单过期时间：" + overTime);
        queue.add(orderInfo);
    }

    /**
     * 从延迟队列中移除
     */
    public void orderRemoveQueue(OrderInfo orderInfo){
        if(null == orderInfo){
            return;
        }
        for (Iterator<OrderInfo> iterator = queue.iterator(); iterator.hasNext();) {
            OrderInfo info = (OrderInfo) iterator.next();
            if(orderInfo.getOrderNo().equals(info.getOrderNo())){
                queue.remove(info);
            }
        }
    }
}

创建一个测试类

/**
 * 模拟订单支付，创建订单
 */
public class OrderPay
{
    static Integer[] str = new Integer[]{1,2,3};

    public static String getTime(long time){
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = new Date(time);
        String currentTime = formatter.format(date);
        return currentTime;
    }

    public static void main(String[] args) throws InterruptedException {
        OrderOverTimeClose.getInstance().init();

        ExecutorService service = Executors.newFixedThreadPool(10);
        for (int i = 0; i < 2; i++) {
            Runnable run = new Runnable() {
                @Override
                public void run() {
                    // 创建初始订单
                    long createTime = System.currentTimeMillis();
                    String currentTime = getTime(createTime);
                    String overTime = getTime(createTime + 10000);// 十秒后超时
                    String orderNo = String.valueOf(new Random().nextLong());
                    OrderInfo order = new OrderInfo();
                    order.setOrderNo(orderNo);
                    order.setExpTime(overTime);
                    int random_index = (int) (Math.random()*str.length);
                    order.setStatus(str[random_index]);// 随机分配
                    order.setCreateTime(currentTime);
                    OrderOverTimeClose.getInstance().orderPutQueue(order, currentTime, overTime);
                }
            };
            service.execute(run);
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

好了 去试试吧 如果那里错了 或者不懂得 请指出来 Vx 号 AiMyHear