• 阻塞队列 ArrayBlockingQueue 我给自己挖了一个坑


    说一句MMB,

    一下午时间,

    package cn.tbnb1.seckil.quene;
    
    import java.util.concurrent.ArrayBlockingQueue;
    import java.util.concurrent.Callable;
    
    import javax.servlet.ServletContextEvent;
    import javax.servlet.ServletContextListener;
    import javax.servlet.http.HttpServletRequest;
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.web.context.WebApplicationContext;
    import org.springframework.web.context.support.WebApplicationContextUtils;
    
    import cn.tbnb1.common.utils.CommonConstant;
    import cn.tbnb1.model.Goods;
    import cn.tbnb1.service.redis.ICacheService;
    import cn.tbnb1.utils.SpringContextUtil;
    
    
    /**
     * 执行请求的工作线程
     * @author Administrator
     *
     */
    
    public class RequestProcessorThread implements Callable<Boolean>  {
        
        
        
    
        /**
         * 自己监控的内存队列
         */
        private ArrayBlockingQueue<HttpServletRequest> queue;
        public RequestProcessorThread(ArrayBlockingQueue<HttpServletRequest> queue) {
            this.queue = queue;
            
        }
        
        @Override
        public Boolean call() throws Exception {
            try {
                while(true) {
                    // ArrayBlockingQueue
                    // Blocking就是说明,如果队列满了,或者是空的,那么都会在执行操作的时候,阻塞住
                    HttpServletRequest request = queue.take();
                synchronized (this) {
                    ICacheService redisCacheService=(ICacheService)SpringContextUtil.getBean("redisCacheService");
                    String itemId=    request.getParameter("id");//商品id
                Long res=    redisCacheService.get(CommonConstant.ITEMS_STORE+7, Long.class);
                    if(res<=0L){//结束秒杀
                            redisCacheService.set(CommonConstant.QUEUE_SISZE,0L,10000);
    //                        queue.clear();
    //                        return true; 这句话  给自己挖的坑  ,首先我自己是这样想的 ,结束秒杀不就 return 掉,mmb  这样好了,call直接停止了,导致请求的线程全部hodl在这里了,

    }else{ Long subtract = redisCacheService.subtract(CommonConstant.ITEMS_STORE+7);//库存 Goods goods = redisCacheService.get("7", Goods.class); String uid = (String)request.getAttribute("Sessionid"); System.out.println("===========抢购结果===========: "+"小菜菜抢购"+goods.toString()); redisCacheService.subtract(CommonConstant.QUEUE_SISZE); } } } } catch (Exception e) { e.printStackTrace(); } return true; } }
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  • 原文地址:https://www.cnblogs.com/java-synchronized/p/7930012.html
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