在Vaadin Web应用程序中分离事件未被调用(Detach event in Vaadin web app not getting called)

在Vaadin Web应用程序中分离事件未被调用(Detach event in Vaadin web app not getting called)

我的问题源于一个几乎与此处相同的问题（最终没有得到满意的答案）：

https:///forum/thread/192610

就像这个人一样，我希望在关闭浏览器后我的应用程序被打开，分离事件会触发; 然而，这并没有发生。 我已经尝试添加一个分离侦听器，覆盖分离方法，并同时执行这两个操作，但它们都没有成功。 至于我怎么知道没有调用detach事件，我的detach事件是一个简单的print语句 - 它没有显示在输出中。

请注意，就像前面提到的线程一样，我已经设置了心跳间隔（在我的情况下为2秒）并将closeIdelSessi设置为true。 所以，我想我只需要等待六秒钟，但事实并非如此。

My question stems from an issue almost identical to the one here (which did not end up getting a satisfactory answer):

https:///forum/thread/192610

Like this person, I expected that upon closing the browser that my app was open in, a detach event would proc; however, this did not happen. I've tried adding a detach listener, overriding the detach method, and doing both at the same time, but none of them were successful. As for how I know the detach event was not called, my detach event is a simple print statement - that does not show up in the output.

ote that like in the aforementioned thread, I've already set the heartbeat interval (2 seconds in my case) and set closeIdelSessi to be true. So, I thought I would just have to wait six seconds, but that's certainly not been the case.

最满意答案

当我尝试这个（到下面代码的基本部分）时，最终会调用detach（）。 我用Jetty运行它，我没有触及它的默认值。 关闭浏览器后约需45分钟，当我看到“Detach called”登录控制台时。 所以是的，时间很长。 原因是只有在HttpSession过期后才会清除最后一个UI（这取决于应用程序容器等设置）。 如果你想更快地强制清理，你需要使用https:///directory/component/cleanupservlet-add-on

@Push @SuppressWarnings("serial") public class DemoUI extends UI { @WebServlet(value = "/*", asyncSupported = true) @VaadinServletConfiguration(productionMode = false, ui = , heartbeatInterval=5, closeIdleSessi=true) public static class Servlet extends VaadinServlet { } @Override public void detach() { println("Detach called"); } @Override protected void init(VaadinRequest vaadinRequest) { ... }

When I try this (find the essential parts of the code below), the detach() is eventually being called. I run this with Jetty, and I did not touch its default. It tooks some ~45 minutes after closing the Browser, when I saw "Detach called" logged on cole. So yes, the time is lengthy. The reason is that the last UI is cleaned up only after HttpSession is expired (which depends on application container etc. settings). If you want to do forced clean up quicker, you need to use https:///directory/component/cleanupservlet-add-on

@Push @SuppressWarnings("serial") public class DemoUI extends UI { @WebServlet(value = "/*", asyncSupported = true) @VaadinServletConfiguration(productionMode = false, ui = , heartbeatInterval=5, closeIdleSessi=true) public static class Servlet extends VaadinServlet { } @Override public void detach() { println("Detach called"); } @Override protected void init(VaadinRequest vaadinRequest) { ... }