UML:流程和活动图 [英] UML : Process and Activity diagram

问题描述

我可以在流程/活动 UML 图中使用双向箭头吗?有什么例子吗?我正在准备一个带有泳道的流程图.我遇到了许多进程在泳道中交叉引用的情况.不是一个好的原样设计.只是想知道用双向箭头来表示这样的流程图可以吗?有什么缺点?

Can I use bidirectional arrows in Process/Activity UML diagram? Any example? I am preparing a process diagram with swimlanes. what I encountered that many processes are cross referencing across the swim lanes. Not a good as-is design. Just want to know is it ok to use bidirectional arrows to represent such process diagram? What are the disadvantages?

推荐答案

UML 规范在这里很难消化.活动/动作与 ControlFlow 相关(参见规范的第 418 页).ControlFlow 本身就是一个 ActivityEdge(参见第 411 页):

The UML specs is hard to digest here. Activities/actions are connected with ControlFlows (see p. 418 of the specs). A ControlFlow itself is an ActivityEdge (see p. 411):

ActivityEdge 是一个抽象类，用于两个 ActivityNode 之间的定向连接.

An ActivityEdge is an abstract class for directed connections between two ActivityNodes.

没有任何限制(我能找到)禁止双向使用.不过，ControlFlow 的所有示例都只是用单箭头指向的.

There is no constraint (I could find) that forbids bi-directional use. All examples of ControlFlows are just directed with single arrow, though.

使用双向流不会让您轻松指定守卫/行为，因为您无法检测哪个方向.但如果你有无条件的流动，那应该没问题.

Using bi-directional flows will not let you specify guards/behavior easily as you can not detect which is for which direction. But if you have unconditional flow it should just be fine.

编辑在页码.22 说明

DirectedRelationship 表示源模型元素集合和目标模型元素集合之间的关系.据说 DirectedRelationship 从源元素指向目标元素.

A DirectedRelationship represents a Relationship between a collection of source model elements and a collection of target model elements. A DirectedRelationship is said to be directed from the source elements to the target elements.

DirectedRelationship 继承自 Relationship，后者继承自 Element.ActivityEdge 相比之下，继承自 RedefinableElement <- NamedElement <- Element.可能他们意味着"ControlFlow 必须从源定向到目标.但实际上并没有定义.

DirectedRelationship inherits from Relationship which inherits from Element. ActivityEdgein contrast inherits from RedefinableElement <- NamedElement <- Element. Likely they "mean" that ControlFlow has to be directed from source to target. But in fact it's not defined.

tl;dr 如果您只使用规范中示例中所示的单向连接器，这取决于您.但是根据定义，它没有定义(原文如此！)并且双向连接器不违反规范.

tl;dr It's up to you if you use only uni-directional connectors as shown in examples in the spec. But per definition it's not defined (sic!) and bi-directional connectors do not violate the specs.

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