使用 f:event 将 ConversationScoped bean 注入 ViewScoped bean
我无法将 ConversationScoped bean 注入 ViewScoped bean，因为 ConversationScoped bean 的生命周期可能比 ViewScoped bean 短，反之亦然，具体取决于 ConversationScoped bean 的生命周期是否较长。
为了克服这个限制，我尝试使用 f:event 作为 preRenderView 监听器来执行注入：
<f:metadata>
<f:event type="preRenderView" listener="#{taskController.initializeTask(workPackageConversation.workPackage)}" />
</f:metadata>
然而这不起作用，监听器initializeTask和getter getWorkPackage都没有被调用。
我意识到我可以使用 FacesContext 从另一个托管 bean 中查找一个托管 bean，但我很好奇为什么这不起作用。是否因为当我从另一个视图导航到一个视图时未调用 f:event 侦听器？ IE。没有重定向或直接页面视图？
我还尝试了 Seam 3 Faces 的 s:viewAction 标签，但没有成功。它也不会被调用。
提前致谢。
I can't inject a ConversationScoped bean into a ViewScoped bean, because the ConversationScoped bean could be shorter lived than the ViewScoped one, or vice versa, depending on whether or not the ConversationScoped bean is long-lived.
To get over this limitation, I tried using an f:event to perform the injection as a preRenderView listener:
<f:metadata>
<f:event type="preRenderView" listener="#{taskController.initializeTask(workPackageConversation.workPackage)}" />
</f:metadata>
This howver is not working, neither the listener initializeTask, nor the getter getWorkPackage are being called.
I realize I can lookup one managed bean from another, using the FacesContext, but I am curious why this isn't working. Is it because the f:event listener isn't called when I navigate to a view from another view? ie. without a redirect or direct page view?
I also tried the s:viewAction tag from Seam 3 Faces, to no avail. It does not get called either.
Thanks in advance.
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我认为生命周期问题不会发挥作用，因为无论如何你总是有一个正常范围的 bean 的代理。您要么在会话处于活动状态时取消引用会话范围的 bean，要么在会话不活动时取消引用会话范围的 bean，但您始终会获得正确的会话。
I would think the lifetime issues would not come into play since you've always got a proxy to the normal-scoped bean anyway. You either dereference the conversation-scoped bean while the conversation is active, or it's not active -- but you'll always get the right conversation.