UML / UML 2.0 Diagrams (Part I) 1

Overview of the 13 diagrams of UML Structure diagrams 1.Class diagram 2.Composite structure diagram (*) 3.Component diagram 4.Deployment diagram 5.Object diagram 6.Package diagram Behavior diagrams 1.Use-case diagram 2.State machine diagram 3.Activity diagram Interaction diagrams 1.Sequence diagram 2.Communication diagram 3.Interaction overview diagram (*) 4.Timing diagram (*) (*) not existing in UML 1.x, added in UML 2.0 2

UML principle: diagram vs. model Different diagrams describe various facets of the model Several diagrams of the same kind may coexist Each diagram shows a projection of the model Incoherence between diagrams (of the same or of different kind(s)) correspond to an ill-formed model The coherence rules between different kinds of diagrams is not fully stated 3

Use case diagram Displays the relationship among actors and use cases, in a given system Main concepts: o System – the system under modeling o Actor – external “user” of the system o Use case – execution scenario, observable by an actor 4

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Class diagram The most known and the most used UML diagram Gives information on model structural elements Main concepts involved o Class - Object o Inheritance o Association (various kinds of) 7

UML Class Gives the type of a set of objects existing at run-time Declares a collection of methods and attributes that describe the structure and behavior of its objects 8

Properties of UML classes May own features o Structural (data related) : attributes o Behavioral : methods/operations May own behavior (state machines, interactions, …) May be instantiated o except for abstract classes that can NOT be directly instantiated and exist only for the inheritance hierarchy 9

Decode class symbol adornments Class name in italics: abstract class Underlined attribute = class attribute Simple class box: passive class Vehicle Automobile +wheelsNO : integer -serialNo : integer +fillTank(In volume:real):real Door +wheelsNO : integer -serialNo : integer door 1 * +fillTank(In volume:real):real Feature visibility +, -, #,~ Attributes area Method (operation) area 10

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Object Instance of a class Can be shown in a class diagram Notation ford : Automobile wheelsNO=4 serialNo=123ABC567 wheelsNO=4 serialNo=123ABC567D 12

Relations Inheritance Association (Aggregation, Composition) Refer to UML_Class_Relation.ppt 13

Interface Declares set of public features and obligations Specifies a contract, to be fulfilled by classes implementing the interface Not instantiable (abstract class) Its specification can be realized by 0, 1 or several classes Interfaces hierarchies can be defined through inheritance relationships In UML 2.0, interface may also include attributes and a special form of a state machine called a protocol state machine. 14

Interface definition and use examples > InteractionPrimitives tokenExchange( > SecureInteraction checkConsistency retrieveLast() checkConsistency() tokenExchange() Satellite SecureInteraction The class Satellite provides implementation for the 3 operations 15

Service Requester vs. Provider Interface SiteSearch is realized (implemented) by SearchService. Interface SiteSearch is used (required) by SearchController 16

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Package 18 Used to reflect the organization of packages and their elements. When used to represent class elements, package diagrams provide a visualization of the namespaces (domains). Subdivide models to permit teams of developers to manipulate and work effectively together Typically a logical view (compared against the component/subsystem/deployment diagrams)

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Component Its definition evolves from UML 1.x to UML 2.0 In UML 1.x - deployment artifacts In UML 2.0 – structured classes Modular unit with well-defined interfaces that is replaceable within its environment Autonomous unit within a system Has one or more provided and required interfaces Its internals are hidden and inaccessible A component is encapsulated Its dependencies are designed such that it can be treated as independently as possible 20

A component can have… Interfaces – An interface represents a declaration of a set of operations and obligations Usage dependencies – A usage dependency is relationship which one element requires another element for its full implementation Ports – Port represents an interaction point between a component and its environment Connectors – Connect two components (links are used to connect objects) – Connect the external contract of a component to the internal structure 21

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Subsystem Used to decompose the physical organization of large- scale system at the highest level of abstraction 23

Nodes and Deployment  Nodes:  Devices and  Execution environment  Focused on the artifacts that deploy executables (i.e.,.exe,.dll,.lib files) 24

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