每个“浏览器"选项卡上如何有一个Backing Bean实例?

问题描述

我的环境:Java 7/JSF 2.1/PrimeFaces 6.1.

我的目标:要实例化应用程序的某个页面多次，每个浏览器选项卡一个，每个页面具有不同的上下文.

我的问题:每次我打开第二个浏览器选项卡时，从相同的URL请求但对象ID不同，前一个被销毁，因此只有一个后备bean实例保持活动状态. >

我怎么知道:在我的后备豆中，有一种方法用@PosConstruct注释，另一种方法用@PreDestroy注释，因此我可以跟踪实例的生命周期.

我的后备豆的注释如下:

@ViewController
public class MyBackingBeanMB extends AbstractBackingBeanMB {
    private static final long serialVersionUID = 1L;

    // many fields and methods
}

@ViewController批注由我必须使用的应用程序框架提供.这样的注释声明为:

@Named
@Controller
@Stereotype
@ViewScoped // For me, this should do the trick, but...
@Target(value={TYPE})
@Retention(value=RUNTIME)
@Inherited
public @interface ViewController {
}

更新1:

@Controller注释也由我使用的框架提供，并声明为:

@InterceptorBinding
@Inherited
@Target({ TYPE, METHOD })
@Retention(RUNTIME)
public @interface Controller {
}

有什么问题的想法吗?

TIA.

解决方案

在Internet上进行一些挖掘之后，我找到了Apache DeltaSpike，它提供了一种新型的托管bean作用域WindowScoped.

带有@ WindowScoped`注释的托管bean的运行方式与我想要的一样，为我提供了所需的确切行为，并且与我必须使用的框架完全兼容.

My environment: Java 7/JSF 2.1/PrimeFaces 6.1.

My goal: to have a certain page of my application instantiated many times, one for each browser tab, each one with a different context.

My problem: everytime I open a second browser tab requesting from the same url, but with different object id, the previous one is destroyed, so only one backing bean instance is kept alive.

How do I know that: In my backing bean I have one method annotated with @PosConstruct and other with @PreDestroy, so I can track the life cicle of the instances.

My backing bean is annotated as follows:

@ViewController
public class MyBackingBeanMB extends AbstractBackingBeanMB {
    private static final long serialVersionUID = 1L;

    // many fields and methods
}

The @ViewController annotation is provided by the application framework I have to use. Such an annotation is declared as:

@Named
@Controller
@Stereotype
@ViewScoped // For me, this should do the trick, but...
@Target(value={TYPE})
@Retention(value=RUNTIME)
@Inherited
public @interface ViewController {
}

Update 1:

The @Controller annotation is also provided by the framework I use and is declared as:

@InterceptorBinding
@Inherited
@Target({ TYPE, METHOD })
@Retention(RUNTIME)
public @interface Controller {
}

Any ideas of what could be wrong?

TIA.

解决方案

After some digging in the Internet I found Apache DeltaSpike, which provider a new kind of managed bean scope, WindowScoped.

Managed beans annotated with @WindowScoped` operate just like I wanted, providing me with the exact behaviour I needed and it is absolutely compatible with the framework I have to use.

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