利用阻塞队列完成异步操作
//异步阻塞队列变量 private BlockingQueue<VoucherOrder> orderTasks=new ArrayBlockingQueue<>(1024*1024); //create the thread pool signal thread private static final ExecutorService SECKILL_ORDER_EXECUTOR=Executors.newSingleThreadExecutor(); @PostConstruct private void init(){ SECKILL_ORDER_EXECUTOR.submit(new VoucherOrderHandler()); } private class VoucherOrderHandler implements Runnable{ @Override public void run() { while(true){ //get orderinfo from blockingqueen try { //获取队列 VoucherOrder voucherOrder = orderTasks.take(); //crate voucherOrder //执行操作 handlerVoucherOrder(voucherOrder); } catch (Exception e) { log.error(e.getMessage().toString()); //throw new RuntimeException(e); } } } }
private IVoucherOrderService proxy;
private void handlerVoucherOrder(VoucherOrder voucherOrder) { // user ID long userID= voucherOrder.getUserId(); RLock lock=redisson.getLock(RedisConstants.LOCK_VOUCHERORDER_KEY+ StrUtil.toString(userID)); boolean islock = lock.tryLock();//active watch dog if(!islock) { log.error("锁创建失败"); } try { //IVoucherOrderService proxy=(IVoucherOrderService)AopContext.currentProxy();//获取spring 对当前对象的代理 proxy.createVoucherOrderByObj(voucherOrder); } catch (IllegalStateException e) { throw new RuntimeException(e); }finally { //lock.unLock(); //my define simple redis lock lock.unlock();//redisson release lock } }
在阻塞队列中增加任务
//6创建订单 VoucherOrder vo=new VoucherOrder(); //6.1 订单ID vo.setId(orderid); vo.setUserId(userID); //6.3 voucher ID vo.setVoucherId(voucherId); orderTasks.add(vo);// save the voucherorder to blockingQueen proxy=(IVoucherOrderService)AopContext.currentProxy();
@PostConstruct
该注解可以实现在运行工程时,自动运行该注解下的方法;
@PostConstruct是java5的时候引入的注解,指的是在项目启动的时候执行这个方法,也可以理解为在spring容器启动的时候执行,可作为一些数据的常规化加载,比如数据字典之类的。
被@PostConstruct修饰的方法会在服务器加载Servle的时候运行,并且只会被服务器执行一次。PostConstruct在构造函数之后执行
也就是加载顺序
服务器加载Servlet -> servlet 构造函数的加载 -> postConstruct ->init(init是在service 中的初始化方法. 创建service 时发生的事件.) ->Service->destory->predestory->服务器卸载serlvet
在spring中Constructor、@Autowired、@PostConstruct的顺序
Constructor >> @Autowired >> @PostConstruct