MESSL（maven + extjs + spring portlet mvc + spring web flow + liferay ）整合架构 5

 

流控制文件很简单，就是根元素是,然后用来代表一个一个的页面，用来代表从一个状态到另外一个状态的跳转，如果有动作要执行就会加在其中。

对于一个普通的java工程师，一般不需要超过1小时就可以熟知这个文件的编写方法,可查阅相关文档。

对于我们的flow,大体上如下所示：

 

因为图片实在太长，所以我没办法吧整个图片都截下来，这里只截取部分，对于flow定义的xml文件，我完整列在这里，可以供读者参考：

 

xml version="1.0" encoding="UTF-8"?>
<flow xmlns="http://www.springframework.org/schema/webflow"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.springframework.org/schema/webflow http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">



    <on-start>
        <evaluate expression="envProvisionInitService.initialize(flowRequestContext)" />



        <evaluate expression="defineHostVipService.listAvailableServices()"
                   result="flowScope.availableServicesInfoJSONData" />

        <set name="flowScope.isViewAction" value="false" type="boolean" />

    on-start>

    <view-state id="aerEnvList" >

        <on-render>
          <evaluate expression="aerEnvGridService.listAppEnvRequests()" result="flowScope.gridListInfoJSONData" />
        on-render>

        <transition on="add" to="defineApp" />
        <transition on="confirm" to="aerRequestConfirm" >

            <evaluate expression="aerEnvGridService.listEnvProvisionInfoByRequestId(requestParameters.requestId,flowRequestContext)"/>
            <set name="flowScope.isViewAction" value="true" type="boolean" />
            <set name="flowScope.requestId" value="requestParameters.requestId" type="string"/>
        transition>
        <transition on="approve" to="aerEnvList">
            <evaluate expression="adminService.approve(requestParameters.requestId)" />
        transition>
        <transition on="close" to="aerEnvList">
            <evaluate expression="adminService.close(requestParameters.requestId)" />
        transition>
        <transition on="reject" to="aerEnvList">
            <evaluate expression="adminService.reject(requestParameters.requestId)" />
        transition>
        <transition on="cmdb" to="aerEnvList">
            <evaluate expression="adminService.cmdb(requestParameters.requestId)" />
        transition>
    view-state>

    <view-state id="defineApp" >

        <transition on="next" to="defineProject">
          <evaluate expression="defineAppService.createAppInfo(requestParameters.appInfoJSONData)"
                   result="flowScope.appInfo"  />
          <set name="flowScope.appInfoJSONData" value="requestParameters.appInfoJSONData" type="string"/>
          <set name="flowScope.hasAppInfoData" value="true" type="boolean"/>
        transition>
        <transition on="cancel" to="aerEnvList" >
            <evaluate expression="defineAppService.removeAppInfo(flowRequestContext)" />
            <evaluate expression="defineProjectService.removeProjectInfo(flowRequestContext)" />
            <evaluate expression="defineHostVipService.removeHostVipInfo(flowRequestContext)" />
            <evaluate expression="defineDBSrvService.removeDBServiceInfo(flowRequestContext)"/>
        transition>
    view-state>

    <view-state id="defineProject">
        <transition on="previous" to="defineApp"/>

        <transition on="next" to="defineHostVip">
            <evaluate expression="defineProjectService.createProjectInfo(requestParameters.projectInfoJSONData)"
                      result="flowScope.projectInfo"  />
            <set name="flowScope.projectInfoJSONData" value="requestParameters.projectInfoJSONData" type="string"/>
            <set name="flowScope.hasProjectInfoData" value="true" type="boolean"/>
        transition>
        <transition on="cancel" to="aerEnvList">
            <evaluate expression="defineAppService.removeAppInfo(flowRequestContext)" />
            <evaluate expression="defineProjectService.removeProjectInfo(flowRequestContext)" />
            <evaluate expression="defineHostVipService.removeHostVipInfo(flowRequestContext)" />
            <evaluate expression="defineDBSrvService.removeDBServiceInfo(flowRequestContext)"/>
        transition>
    view-state>

    <view-state id="defineHostVip">
        <transition on="previous" to="defineProject"/>

        <transition on="next" to="defineDBService">
            <evaluate expression="defineHostVipService.createHostVipInfo(requestParameters.hostVipInfoJSONData, flowRequestContext)"
                      result="flowScope.hostVipInfo"  />
            <set name="flowScope.hostVipInfoJSONData" value="requestParameters.hostVipInfoJSONData" type="string"/>

            <set name="flowScope.hasHostVipInfoData" value="true" type="boolean"/>
            <set name="flowScope.services" value="requestParameters.services" type="string" />
        transition>
        <transition on="cancel" to="aerEnvList">
            <evaluate expression="defineAppService.removeAppInfo(flowRequestContext)" />
            <evaluate expression="defineProjectService.removeProjectInfo(flowRequestContext)" />
            <evaluate expression="defineHostVipService.removeHostVipInfo(flowRequestContext)" />
            <evaluate expression="defineDBSrvService.removeDBServiceInfo(flowRequestContext)"/>
        transition>
    view-state>

    <view-state id="defineDBService">
        <transition on="previous" to="defineHostVip"/>

        <transition on="next" to="aerRequestConfirm">
            <evaluate expression="defineDBSrvService.createDBServiceInfo(requestParameters.dbServiceInfoJSONData, flowRequestContext)"
                      result="flowScope.dbServiceInfo"  />
            <set name="flowScope.dbServiceInfoJSONData" value="requestParameters.dbServiceInfoJSONData" type="string"/>
            <set name="flowScope.hasDbServiceInfoData" value="true" type="boolean"/>
            <set name="flowScope.isSubmitted" value="false" type="boolean"/>
            <set name="flowScope.isViewAction" value="false" type="boolean" />
        transition>
        <transition on="cancel" to="aerEnvList">
            <evaluate expression="defineAppService.removeAppInfo(flowRequestContext)" />
            <evaluate expression="defineProjectService.removeProjectInfo(flowRequestContext)" />
            <evaluate expression="defineHostVipService.removeHostVipInfo(flowRequestContext)" />
            <evaluate expression="defineDBSrvService.removeDBServiceInfo(flowRequestContext)"/>
        transition>
    view-state>

    <view-state id="aerRequestConfirm">
        <transition on="previous" to="defineDBService"/>
        <transition on="submit" to="aerRequestSummary">
            <evaluate expression="envProvisionRequestService.submitEnvProvisionRequest(flowRequestContext)"
                      result="flowScope.submitResult"  />
        transition>


        <transition on="cancel" to="aerEnvList">
            <evaluate expression="defineAppService.removeAppInfo(flowRequestContext)" />
            <evaluate expression="defineProjectService.removeProjectInfo(flowRequestContext)" />
            <evaluate expression="defineHostVipService.removeHostVipInfo(flowRequestContext)" />
            <evaluate expression="defineDBSrvService.removeDBServiceInfo(flowRequestContext)"/>
        transition>

        <transition on="adminSubmit" to="aerRequestSummary">
            <evaluate expression="envProvisionRequestService.updateEnvProvisionRequest(flowRequestContext)"
                      result="flowScope.submitResult"  />
            <set name="flowScope.isViewAction" value="false" type="boolean" />

        transition>


        <transition on="adminCancel" to="aerEnvList">
            <evaluate expression="defineAppService.removeAppInfo(flowRequestContext)" />
            <evaluate expression="defineProjectService.removeProjectInfo(flowRequestContext)" />
            <evaluate expression="defineHostVipService.removeHostVipInfo(flowRequestContext)" />
            <evaluate expression="defineDBSrvService.removeDBServiceInfo(flowRequestContext)"/>
            <set name="flowScope.isViewAction" value="false" type="boolean" />
        transition>


        <transition on="noAdminOK" to="aerEnvList">
            <evaluate expression="defineAppService.removeAppInfo(flowRequestContext)" />
            <evaluate expression="defineProjectService.removeProjectInfo(flowRequestContext)" />
            <evaluate expression="defineHostVipService.removeHostVipInfo(flowRequestContext)" />
            <evaluate expression="defineDBSrvService.removeDBServiceInfo(flowRequestContext)"/>
            <set name="flowScope.isViewAction" value="false" type="boolean" />
        transition>




        <transition on="editApplicationInfo" to="defineApp"/>
        <transition on="editProjectInfo"  to="defineProject"/>
        <transition on="editHostVipInfo"  to="defineHostVip"/>
        <transition on="editDBServiceInfo"  to="defineDBService"/>
    view-state>

    <view-state id="aerRequestSummary">
        <transition on="ok" to="aerEnvList">
            <evaluate expression="defineAppService.removeAppInfo(flowRequestContext)" />
            <evaluate expression="defineProjectService.removeProjectInfo(flowRequestContext)" />
            <evaluate expression="defineHostVipService.removeHostVipInfo(flowRequestContext)" />
            <evaluate expression="defineDBSrvService.removeDBServiceInfo(flowRequestContext)"/>
        transition>
    view-state>

    <end-state id="finish"/>

flow>

这里，因为我们在这系列的第二篇文章中已经提及到，我们开启了包扫描机制，所以这些Spring的Bean在应用上下文创建的时候就已经实例化了，所以在这个流定义文件中可以轻松的使用这些bean.

 

 其实在做架构的时候，我曾和我们团队其他开发者讨论到为什么我们用spring web flow,其实这种页面跳转我们也可以不用web flow做，最后采用web flow的架构是基于以下几个原因：

众所周知，一般web应用的scope有 request，session,application,因为在很多配置页面上都有数据，并且这些数据都要共享，还比较大（那些传递的vo动辄100+字段）而且业务流程也比较复杂，而且这些数据还是有状态的，所以我们无法放在request scope上，而如果放在session scope上，又会加重系统的内存负担，所以我们需要一种介于request,session范围之间的scope,而spring web flow刚好提供了flow scope来精确的满足我们的需求，所以我们使用spring web flow.