Question

我使用的是一个弹簧控制器，它从threadsafe方法返回一个字符串。所以我让控制器也是线程安全的。我想知道有多少请求同时在队列中调用弹簧控制器

Answer 1

以下是我建议如何解决您的问题。

想象一下，你有这个@Controller：

@Controller
public class MyController {

    @Autowired
    private IMyService service;

    @RequestMapping(value = "/myPathName", method = RequestMethod.GET)
    public String home(HttpServletRequest request, Model model) {

        // you synchronized call
        service.callSynchronized(request, model); 

        return "someJsp";
    }

    // +edit
    @ResponseBody
    @RequestMapping(value = "/queueStatus", method = RequestMethod.GET)
    public String home(HttpServletRequest request) {

        // 
        return "inQueue: " + request.getAttribute("inQueue");
    }
}

现在，您可以定义interceptor并在执行前后计算请求：

public class RequestsInWorkInterceptor extends HandlerInterceptorAdapter {

    private static final Logger _logger  = LoggerFactory.getLogger(RequestsInWorkInterceptor.class);
    private final AtomicLong counter     = new AtomicLong();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String methodURI = request.getRequestURI();
        long current;
        if("myPathName".equals(methodURI){
            current = counter.incrementAndGet();
            _logger.debug("current {} clients in a queue", current);
        } else {
            current = counter.get(); // just get, no increment
        }

        // +edit: put the count in the request so you can get it in you controller
        request.setAttribute("inQueue", current);
        return super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        String methodURI = request.getRequestURI();
        if("myPathName".equals(methodURI){
            counter.decrementAndGet();
        }
        super.postHandle(request, response, handler, modelAndView);
    }
}

Answer 2

您可以使用Jetty的StatisticsHandler和JMX获取有关活动请求数的信息。

如果您将Jetty用作嵌入式容器（推荐方法），则可以使用EmbeddedServletContainerCustomizer进行设置：

@Bean
public EmbeddedServletContainerCustomizer containerCustomizer() {
return new EmbeddedServletContainerCustomizer() {

    @Override
    public void customize(ConfigurableEmbeddedServletContainer container) {
        ((JettyEmbeddedServletContainerFactory) container)
                .addServerCustomizers(new JettyServerCustomizer() {

            @Override
            public void customize(Server server) {
                MBeanContainer mbContainer = new MBeanContainer(
                        ManagementFactory.getPlatformMBeanServer());
                server.addEventListener(mbContainer);
                server.addBean(mbContainer);

                StatisticsHandler statisticsHandler = new   StatisticsHandler();
                statisticsHandler.setHandler(server.getHandler());
                server.setHandler(statisticsHandler);
            }
        });
    }

    };
    }

您需要在org.eclipse.jetty：jetty-jmx上添加依赖项才能访问MBeanContainer。

您可以尝试使用弹簧套筒执行器。在端点/指标上，您应该有字段＆＃34; httpsessions.active＆＃34;
公共类RequesInterceptor扩展HandlerInterceptorAdapter { private static Object lock = new Object（）; private static int count = 0

@覆盖 public boolean preHandle（HttpServletRequest request，HttpServletResponse response，Object handler）抛出ServletException { sinchronize（锁）{ 计数++; } }

}

查找线程安全弹簧控制器中有多少请求在队列中

2 个答案: