UML

引言 現代軟體架構很少遵循簡單的線性執行路徑。分散式系統、事件驅動的微服務以及並行資料管道，需要能夠準確描述條件分支、平行執行、迭代過程與例外處理的行為模型。傳統的UML序列圖受限於嚴格...continue reading →

引言 現代軟體系統很少是靜態的。物件、組件和服務持續演變，回應使用者輸入、網路訊息、硬體信號和內部計時器。雖然結構化建模擅長定義 什麼 系統是由什麼組成的，卻無法充分捕捉 如何 這些組件...continue reading →

介紹 隨著現代軟體系統規模與功能不斷擴大，平面狀態圖迅速變得難以處理。現實世界的應用程式很少以簡單的線性方式運作；相反，它們需要管理相互依賴的工作流程、背景程序以及使用者驅動的互動，這些...continue reading →

引言 在現代軟體工程中，使用案例圖經常被誤解為僅僅是功能清單或高階專案路徑圖。事實上，它們扮演著架構腳手架的角色。當正確應用時，使用案例關係不僅僅是列出系統應執行的內容；它們會主動將複雜...continue reading →

引言 現代軟體系統本質上非常複雜，由數百個相互作用的組件、並行處理流程和複雜的資料流組成。彌合抽象業務需求與具體技術實現之間的差距，需要一種標準化且明確的溝通媒介。統一建模語言（UML）...continue reading →

Packages in the Unified Modeling Language are used to group elements and provide namespaces for the grouped elements. A package can contain other packages, thus providing a hierarchical organization of packages. Almost all UML elements can be grouped into packages. Thus, classes, objects, use cases, components, nodes, node instances, etc. can be organized into packages, thus making the organization of the myriad elements contained in a real-world UML model manageable.

UML Sequence Diagrams are interaction diagrams that detail how operations are carried out. They capture the interaction between objects in the context of a collaboration. Sequence Diagrams are time focus and they show the order of the interaction visually by using the vertical axis of the diagram to represent time what messages are sent and when.

In UML, relationships are connections between model elements. Use cases are also connected to each other in different kinds of relationships. The relationship between two use cases basically models the dependencies between two use cases. By reusing existing use cases using different types of relationships, the overall effort required to develop the system is reduced. Use case diagrams show use cases, actors, and the relationships between them. For example, the relationship between an actor and a use case illustrates that the actor can use a certain functionality of the business system.

Use case relationships model the dependencies between use cases in the interaction model of the system. Although, independent use cases can adequately represent simpler systems. However, in order to represent complex or large systems, we may need to construct complex use cases with the help of dependencies between use cases. Establishing relationships between use cases allows reuse of those use cases that need to be defined over and over again, which reduces developer effort.