流量取决于外部参数? [英] Flow depending on external parameter?

问题描述

我正在构建一个简单的POC来进行Faces Flow实验.

I'm building a simple POC to experiment with Faces Flow.

• 第1页:显​​示公司列表.用户选择公司A，然后转到第2页.

• 第2页:在选定的公司页面上，用户单击命令链接以启动向导以创建要添加到公司A的新员工.

• page 1: displays a list of companies. The user selects company A then goes to page 2.

• page 2: on the selected company page, the user clicks a commandLink to start a wizard to create a new employee to be added to the company A.

在场景中，我有一个@FlowScoped("addNewUsertoCompanyFlow") bean MyFlowBean.

Behing the scenes I've got a @FlowScoped("addNewUsertoCompanyFlow") bean MyFlowBean.

在@PostConstruct方法中，MyFlowBean需要从服务(@Inject)中获取与公司A相对应的对象.

In its @PostConstruct method, the MyFlowBean needs to fetch an object corresponding to the company A from a service (@Inject).

让MyFlowBean知道公司A的ID以便它可以从服务中获取它的正确方法是什么?

What's the right way to let MyFlowBean know about the ID of the company A so that it can fetch it from the service ?

谢谢.

推荐答案

好的，我想出了一个解决方案.关键不是使用流支持bean @PostConstruct，而是使用流初始化程序，我可以在其中获取请求参数.

Ok, I came up with a solution. The key was not to use the flow backing bean @PostConstruct but rather use the flow initializer, where I can grab request parameters.

因此，我在表单中使用了一些其他输入，将开始我的流程:

So I'm using some additional input in the form that will start my flow:

<h:form id="myForm" prependId="false">
    <h:commandLink value="Enter myFlow" action="my-flow"/>
    <h:inputHidden id="parameter" name="parameter" value="8"/>
</h:form>

在流定义中，我为流定义了一个初始化程序，在流支持bean中调用了一些方法

In my flow definition I've defined an initializer for the flow, calling some method in the flow backing bean

@Produces @FlowDefinition
public Flow defineFlow(@FlowBuilderParameter FlowBuilder flowBuilder) {
String flowId = "my-flow";
    flowBuilder.id("", flowId);
    flowBuilder.initializer("#{myFlowBean.startFlow()}");
    ...
}

然后，我在后备bean中抓取了该参数.

I've then grabbed the parameter inside the backing bean.

@Named
@FlowScoped("my-flow")
public class MyFlowBean implements Serializable {

    public void startFlow() {
        String parameter = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("parameter");
        //now do sthg with the parameter, such as fetching data from an injected service
        ....
    }
}

当然，也可以在流定义级别做到这一点

Of course it's also possible to do that at the flow definition level

flowBuilder.initializer("#{trainingFlowBean.startFlow(param['parameter'])}"); 

并在startFlow方法中只有一个参数

and just have a parameter in the startFlow method

public void startFlow(String parameter) {
    ...
}

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