我如何使用@ConversationScoped
我正在编写一个 JSF 2.0 应用程序，并且我想使用 CDI 注释而不是“等效的”JSF 注释。换句话说，@Model 或@Named 代替@ManagedBean，@Inject 代替@ManagedProperty。
我唯一无法开始工作的是 @ViewScoped，它对于 AJAX 组件来说是必需的。唯一可靠的解决方法是使用 @SessionScoped，这不是一个好的做法。
正确的做法是什么？尽管我搜索得越多，我就越感到困惑。
这是在 GlassFish 3.1.1 上，据我所知其中有 Weld 1.1.0。
更新：这个问题的原始形式说我无法让@ConversationScoped 工作。从那时起，我发现了我的错误，并且确实让它像这样工作：
@Model
@ConversationScoped
public class Abean implements Serializable {
@Inject Conversation conversation;
// stuff omitted for brevity
public String getSomething() {
if (conversation.isTransient()) conversation.begin();
return "something";
}
这似乎可以解决问题。然而现在我的问题改变了。你到底应该在哪里调用conversation.end()？我是否必须编写一个过滤器来检测用户何时离开页面？或者如果不管它，Abean 实例什么时候会被取消引用？
第二次更新：对 CDI 的 @ConversationScoped 进行了很好的讨论，我发现 这里。
我仍然面临着如何调用conversation.end()的问题。我的 bean 为通过 AJAX 更新的数据表浏览器提供有状态支持，并且调用 end() 的最佳位置是当用户离开页面时。然而，如果没有编写一个过滤器来监视页面，我真的看不到任何方法可以做到这一点。欢迎任何“最佳实践”建议。
I am writing a JSF 2.0 application, and I want to use CDI annotations instead of the "equivalent" JSF annotations. In other words, @Model or @Named instead of @ManagedBean, and @Inject instead of @ManagedProperty.
The only thing I cannot get to work is @ViewScoped which is necessary for AJAX components. The only reliable work-around is to use @SessionScoped, which is not a good practice.
What is the correct practice? As much as I search I just get more confused.
This is on GlassFish 3.1.1, which I understand has Weld 1.1.0 in it.
UPDATE: The original form of this question said that I could not get @ConversationScoped to work. Since then I found my error and I did get it to work like so:
@Model
@ConversationScoped
public class Abean implements Serializable {
@Inject Conversation conversation;
// stuff omitted for brevity
public String getSomething() {
if (conversation.isTransient()) conversation.begin();
return "something";
}
This seems to do the trick. However now my question is changed. Where exactly are you supposed to call conversation.end()? Do I have to write a filter to detect when the user leaves the page? Or if it is left alone, just when would the Abean instance be de-referenced?
SECOND UPDATE: A very good discussion of CDI's @ConversationScoped I found here.
I am still left with the problem of how to call conversation.end(). My bean provides stateful backing to a data table browser updated via AJAX, and the optimal place to call end() is when the user navigates away from the page. However short of writing a filter to monitor the pages I don't really see any way of doing that. Any suggestion of "best practice" is welcome.
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使用 MyFaces CODI 的 (CDI) 范围就更简单了。他们有更好的@ConversationScoped，您会喜欢@ViewAccessScoped 来实现您正在尝试的功能。
That's way simpler with the (CDI) scopes of MyFaces CODI. They have a better @ConversationScoped and you will love the @ViewAccessScoped for what you are trying.
更新：JSF 2.2（jsr 344，处于早期草案审查中）为此添加了 @FlowScoped CDI 范围。 更多信息...
update: JSF 2.2 (jsr 344, in early draft review) is adding an @FlowScoped CDI scope for this. More info...