Question

如果您曾经运行过ObjectBuilder，则实例化的对象将被缓存，下次使用PropertyInjector或其他内容时，将使用实例化的对象而不是创建新对象。或者至少这应该是这样的：）

但是在下面的例子中，似乎伙伴试图再次实例化该对象：

发生以下错误：

! TerminalPresentationModel - constructor called # dispatcher = [object GlobalDispatcher] ! 
<Injectors (started)    target="[class TerminalPresentationModel]"   includeDerivatives="false"   dispatcherType="inherit"   scope="[object Scope]">
        <PropertyInjector   sourceKey="currentDate"   targetKey="date"   source="[class DateManager]"   sourceCache="inherit"   softBinding="false"/>

---------------------------------------------------------
- ERROR: Wrong number of arguments supplied when calling the constructor 
- TARGET: TerminalPresentationModel 
- TAG: PropertyInjector 
- METHOD: constructor
- FILE: TerminalMainEventMap
- NO ARGUMENTS SUPPLIED 
- STACK TRACE: ###SHORTENED###
---------------------------------------------------------


---------------------------------------------------------
- ERROR: source is undefined in tag PropertyInjector 
- TARGET: TerminalPresentationModel 
- TAG: PropertyInjector 
- FILE: TerminalMainEventMap
---------------------------------------------------------

- INFO: Data binding will not be able to detect assignments to date
</Injectors (end)    target=[class TerminalPresentationModel]>
! DateManager - constructor called # dispatcher = [object GlobalDispatcher] !
<Injectors (started)    target="[class TerminalContainer]"   includeDerivatives="false"   dispatcherType="inherit"   scope="[object Scope]">
    <ObjectBuilder   registerTarget="true"   constructorArguments="[object GlobalDispatcher]"   cache="inherit"   generator="[class TerminalPresentationModel]"/>
    <PropertyInjector   targetKey="pm"   source="[object TerminalPresentationModel]"   sourceCache="inherit"   softBinding="false"/>
- INFO: Data binding will not be able to detect assignments to pm
</Injectors (end)    target=[class TerminalContainer]>

任何暗示我的代码有什么问题？

更新2010-08-16 作为ktutnik的请求，更多细节：我使用EventMap：

<?xml version="1.0" encoding="utf-8"?>
<EventMap
    >

    <fx:Script>
        <![CDATA[           
            // imports and namespaces shortened

            [Bindable]
            public var endpoint:String = "";
        ]]>
    </fx:Script>


    <fx:Declarations>
        <Debugger level="{Debugger.ALL}" />

        <myService:Services id="services" endpoint="{endpoint}"/>

        <maps:TimeEventMap endpoint="{endpoint}"/>

        <EventHandlers type="{FlexEvent.PREINITIALIZE}">
            <ObjectBuilder 
                generator="{TerminalPresentationModel}" 
                constructorArguments="{scope.dispatcher}" />
            <ObjectBuilder
                generator="{DateManager}"
                constructorArguments="{scope.dispatcher}" />
            <ObjectBuilder
                generator="{TerminalFaultHandler}" />
        </EventHandlers>

        <EventHandlers type="{DataServiceEvent.GET_CURRENT_TERMINAL_STATUS}">
            <RemoteObjectInvoker instance="{services.TerminalService}"
                 method="getCurrentTerminalStatus"
                 arguments="{[event.locationId,event.actualPlan]}"
                 showBusyCursor="false">
                <resultHandlers>
                    <MethodInvoker generator="{TerminalPresentationModel}"
                                   method="setCurrentTerminalStatus"
                                   arguments="{resultObject}" />
                    <MethodInvoker generator="{TerminalFaultHandler}"
                                   method="removeError" />
                </resultHandlers>
            </RemoteObjectInvoker>
        </EventHandlers>


        <Injectors target="{TerminalContainer}"
                   debug="true">
            <ObjectBuilder
                generator="{TerminalPresentationModel}"
                constructorArguments="{scope.dispatcher}" />
            <PropertyInjector
                targetKey="pm"
                source="{lastReturn}" />
        </Injectors>

        <Injectors target="{TerminalPresentationModel}"
                   debug="true">
            <PropertyInjector targetKey="date" source="{DateManager}" sourceKey="currentDate" />
        </Injectors>

        <Injectors target="{TerminalContent}">
            <PropertyInjector targetKey="faultHandler"
                source="{TerminalFaultHandler}" />
        </Injectors>

        <EventHandlers type="{UnhandledFaultEvent.FAULT}">
            <MethodInvoker generator="{TerminalFaultHandler}" method="handleFault" 
                           arguments="{event.fault}" />
        </EventHandlers>
    </fx:Declarations>
</EventMap>

Flex：4.0 队友：0.8.9

Answer 1

将debug="true"放在你的EventHandlers和Injector标签中并查看前一个...尝试将CreationComplete事件组合起来，而不是PreIntitialize。如果我在Application CreationComplete中没有弄错，早于Preinitialize（但我真的不确定..因为它也让我感到困惑）。

Answer 2

似乎你不能在一个EventMap中拥有两个ObjectBuilder。这将导致此问题。当我在Preinitialize-Event中删除ObjectBuilder时，一切正常。

这是一种奇怪的行为，因为在其他地方我写的就像这种情况一样，没有问题发生。所以我真的不知道为什么它有效，但它似乎解决了我的问题。

Flex / mate：mate不缓存使用Object Builder创建的实例

2 个答案: