Spring Webflow - 决策状态与动作状态 [英] Spring Webflow - decision-state vs action-state

问题描述

我正在使用Spring WebFlow 2，我想知道决策状态与动作状态的区别。

I am using Spring WebFlow 2 and I want to know the diff of decision-state vs action-state.

我正在阅读并且不理解差异决策状态与行动状态。我理解视图状态会显示一个输入的jsp，但是决策状态与动作状态的差异是什么？

I am reading up and dont understand the diff of decision-state vs action-state. I understand that view-state will display a jsp for input but whats the diff of decision-state vs action-state?

为什么我应该使用决策状态而不是动作-州？
为什么我应该在决策状态下使用动作状态？

why should I use decision-state over a action-state? why should I use a action-state over a decision-state?

有人可以点亮这个

推荐答案

通常，决策状态专门用于布尔条件。它更清晰简洁。

Generally, decision-state is used exclusively for a boolean conditional. It's more clear and concise as to what it occurs.

例如，

<decision-state id="myDecisionState">
    <if test="myBooleanFunction()" then="resultIsTrueState" else="resultIsFalseState" />
</decision-state>

可以使用动作状态像这样：

<action-state id="myActionState">
    <evaluate expression="myBooleanFunction()" />
    <transition on="yes" to="resultIsTrueState" />
    <transition on="no" to="resultIsFalseState" />
</action-state>

然而，区别在于 action-state 不只是操作布尔值 - 它可以触发转换字符串（字符串值），布尔值（是/否），枚举（枚举名称），其他任何结果都被视为成功。

However, the difference is that action-state does not just operate on booleans - it can trigger transitions on String (string value), Boolean (yes/no), Enum (enum name) with any other result considered a success.

因此，与决策状态形成对比，实际必须决定，操作-state 可以简单地用于执行某些代码。

So, by contrast to a decision-state which actually has to decide something, an action-state can simply be used to execute some code.

<action-state id="myActionState">
    <evaluate expression="myFunction()" />
    <transition on="success" to="myNextState" />
</action-state>

我希望能够解决问题。

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