会话结束时销毁视图范围的bean [英] Destroying view-scoped beans when session ends

问题描述

我的问题与此相关（可能还有其他问题）：

@ PreDestroy永远不会调用@ViewScoped

如前所述，有没有简单的解决方案可以使视图范围的bean在导航过程中销毁，同样的情况在会话过期时也是如此。

发布一个非平凡的方法（调用 @ PreDestroy 方法）JSF视图范围的bean看起来像，或者更具体地说，只要会话过期了？

我正在使用Java EE 6和GlassFish 3.1.2上的Mojarra 2.1.x。

解决方案

创建 @SessionScoped bean来保存资源（在某些集合/数组中？）并将它注入到 @ViewScoped bean中，然后依靠 @PreDestroy

确实，这样资源就会亮起来比你想要的要长，但这是你可以得到的最简单可靠的解决方案。如果你想在视图范围的bean中保留 @PreDestroy ，那么你需要以某种方式确保最终用户始终通过HTTP POST请求执行导航查看范围的bean。您无法可靠地保证（最终用户的PC可能会崩溃等）。

My question is related to this one (and probably others):

@PreDestroy never called on @ViewScoped

As stated there, there's no trivial solution to either have view-scoped beans destroyed upon navigation and the same seems to hold true for when the session expires.

What would a non-trivial approach to release (calling the @PreDestroy method) JSF view-scoped beans look like, or more specifically as soon as the session expires?

I'm using Java EE 6 and Mojarra 2.1.x on GlassFish 3.1.2.

解决方案

Create a @SessionScoped bean to hold the resources (in some collection/array?) and inject it in the @ViewScoped bean and then rely on the @PreDestroy of the session scoped bean.

True, this way the resources live a little longer than you want, but that's the most easy and reliable solution you can get. If you want to keep the @PreDestroy in the view scoped bean, then you'd need to somehow make sure that the enduser always performs navigation by a HTTP POST request on exactly this view scoped bean. You can't reliably guarantee that (the enduser's PC might crash and so on).

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