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118 lines
2.9 KiB
Markdown
118 lines
2.9 KiB
Markdown
---
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title: "UML"
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tags:
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- info201
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---
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A standard set of model constructs and notation defined by the object management group
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specify what not how
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- activity diagrams
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- high level for business prcesses workflows
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- low level for dtailed business logic
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- advantages
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- describe workflows
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- specify relative processing rder of activites
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- simple
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- can be shown to stakeholders for checking and confirmation
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enables implementation-independent specification of:
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- user/system interactions
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- partitioning of responsibility
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- integration with larger or existing systems
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- data flow and dependency
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- order of operations (algorithms and processes)
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- concurrent operations
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## 1 why is is useful
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- helps develop efficient effective correct designs
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- better communication with project stakeholders
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- gives a big picture view of the project system
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- independent of specific programming languages or development processes
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- de facto standard for modelling OO systems
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## 2 what it is not
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- visual modelling software
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- a programming languages
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- a software development process, method, or methodology
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## 3 Types of diagram
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### 3.1 structural
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### 3.2 behavioural
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### 3.3 Linked diagrams
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each digram type models a dfiferenct aspect of the system
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many of the diagrams link to each other
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- e.g., use case, sequence, activity
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- e.g., object, communication
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e.g.,
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### 3.4 Activites and transitions
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- activities
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- take place over some pariod of time
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- linked by transitions (arrows)
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- only one starting point potentaily many ending conditions
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- Transitions
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- have guard conditions that must be satisfied before the transition can occur
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### 3.5 Decision points
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- represent conditional branching
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- two or more alternative transitions depending on condition
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- every transiiton exiting the decision point must have a guard condition
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### 3.6 Synchonisation bars
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- represents two or more activites running in parallel
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- transitions can be split into mutiple paths and recombined later
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- if a workflow is split then it must be recombined on the same diagram
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### 3.7 swim lanes
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- same as BPMN
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- show who is responsible for a process
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- can represent
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- business organisations
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- depts
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- people (actors)
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- can simplify processes
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### 3.8 relationships to use cases
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- use case diagrams show the high level interactions between actors and cases
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- high level activity diagrams show the sequence of use cases within a workflow
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#### 3.8.1 example
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### 3.9 Example producing a book
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