对于不同的组件，绑定发生在不同的阶段

Question

我有两个viewParameters和两个绑定到bean属性的inputTexts。

当我加载该页面时（通过在浏览器中输入URL），在RESTORE_VIEW阶段期间，viewParameters的setter将被调用两次。

在RENDER_RESPONSE中调用inputTexts的setter一次

为什么viewParameters的setter会被调用两次？

为什么不同UI组件的setter会在完全不同的阶段被调用？

xhtml的正文：

<h:body>
    <h:form
      id="modelSearch">


<f:metadata>
   <f:viewParam name="one" binding="#{modelSearchBean.requestOne}" > </f:viewParam>
   <f:viewParam name="two" binding="#{modelSearchBean.requestTwo}" />
</f:metadata>

      <p:messages display="text" />

                  <p:outputLabel
                    for="one"
                    value="one" />
                  <p:inputText
                    id="one"
                    binding="#{modelSearchBean.one}"
                    >
                  </p:inputText>

                  <p:outputLabel
                    for="two"
                    value="two" />
                  <p:inputText
                    id="two"
                    binding="#{modelSearchBean.two}"
                    >
                  </p:inputText>
    </h:form>
</h:body>

豆子：

@Component("modelSearchBean")
@Scope("request")
public class ModelSearchBean {

    private UIInput requestOne;
    private UIInput requestTwo;
    private UIInput one;
    private UIInput two;

    public UIInput getRequestOne() {
        return requestOne;
    }

    public void setRequestOne(UIInput requestOne) {
        this.requestOne = requestOne;
        System.out.println("requestOne");
    }

    public UIInput getRequestTwo() {
        return requestTwo;
    }

    public void setRequestTwo(UIInput requestTwo) {
        this.requestTwo = requestTwo;
        System.out.println("requestTwo");
    }

    public UIInput getOne() {
        return one;
    }

    public void setOne(UIInput one) {
        this.one = one;
        System.out.println("One");
    }

    public UIInput getTwo() {
        return two;
    }

    public void setTwo(UIInput two) {
        this.two = two;
        System.out.println("two");
    }
}

输出（相位信息来自PhaseListener）：

>>>>>> STARTING PHASE: RESTORE_VIEW 1
requestOne
requestTwo
requestOne
requestTwo
<<<<<< ENDING PHASE: RESTORE_VIEW 1
>>>>>> STARTING PHASE: APPLY_REQUEST_VALUES 2
<<<<<< ENDING PHASE: APPLY_REQUEST_VALUES 2
>>>>>> STARTING PHASE: PROCESS_VALIDATIONS 3
<<<<<< ENDING PHASE: PROCESS_VALIDATIONS 3
>>>>>> STARTING PHASE: UPDATE_MODEL_VALUES 4
<<<<<< ENDING PHASE: UPDATE_MODEL_VALUES 4
>>>>>> STARTING PHASE: INVOKE_APPLICATION 5
<<<<<< ENDING PHASE: INVOKE_APPLICATION 5
>>>>>> STARTING PHASE: RENDER_RESPONSE 6
One
two
<<<<<< ENDING PHASE: RENDER_RESPONSE 6