Composite Structure Diagram (UML).pdf

Composite structure diagram 1
Composite structure diagram
Composite structure diagram in the
Unified Modeling Language (UML) is
a type of static structure diagram, that
shows the internal structure of a class
and the collaborations that this
structure makes possible.
This diagram can include internal
UML 2.0 composite structure diagram.
parts, ports through which the parts
interact with each other or through which instances of the class interact with the parts and with the outside world,
and connectors between parts or ports. A composite structure is a set of interconnected elements that collaborate at
runtime to achieve some purpose. Each element has some defined role in the collaboration.
Composite structure concepts
The key composite structure entities identified in the UML 2.0 specification are structured classifiers, parts, ports,
connectors, and collaborations [1] .
• Part : A part represents a role played at runtime by one instance of a class or by a collection of instances. The part
may only name the role, it may name an abstract superclass, or it may name a specific concrete class. The part can
include a multiplicity factor, such as the [0..*] shown for Viewer in the diagram.
• Port : A port is an interaction point that can be used to connect structured classifiers with their parts and with the
environment. Ports can optionally specify the services they provide and the services they require from other parts
of the system. In the diagram, each of the small squares is a port. Each port has a type and is labelled with a name,
such as "var", "indVar1", or "view" in the diagram. Ports may contain a multiplicity factor, for example [3].
Ports can either delegate received requests to internal parts, or they can deliver these directly to the behavior of
the structured classifier that the port is contained within. Public ports that are visible in the environment are
shown straddling the boundary, while protected ports that are not visible in the environment are shown inside
the boundary. All the ports in the diagram are private, except for the view port along the right boundary of
FibonacciSystem.
• Connector : A connector binds two or more entities together, allowing them to interact at runtime. The connector
is shown as a line between some combination of parts, ports and structured classifiers. The diagram shows three
connectors between ports, and one connector between a structured classifier and a part.
• Collaboration : A collaboration is generally more abstract than a structured classifier. It is shown as a dotted oval
containing roles that instances can play in the collaboration.
• Structured classifier : A StructuredClassifier represents a class, often an abstract class, whose behavior can be
completely or partially described through interactions between parts.
An EncapsulatedClassifier is a type of structured classifier that contains ports. In the diagram below, both
FibonacciSystem and Variable are encapsulated classifiers because they both have ports along their
boundaries.

Composite structure diagram 2
Composite structure diagram example
As an example, consider one possible way of modeling production of the Fibonacci sequence.
This UML 2.0 composite structure diagram specifies that instances of
the 'FibonacciSystem' class are composed of a number of parts. The
topmost of these parts is identified as having the classifier
'FibonacciFunction'. Three of the parts are identified by the role they
play within instances of FibonacciSystem - the NMinus2 role, the UML 2.0 composite structure diagram.
NMinus1 role, and the N role. The fifth part, identified by its classifier
Viewer, includes a multiplicity specification. At runtime there can be 0 or more instances of Viewer or some
concrete subclass of Viewer.
At runtime the class instances that implement these three roles must provide the services specified by the IVar
interface through their var ports. One such class is Variable, shown on the diagram with a port named var of type
Var that realizes the IVar interface.
The port named "view" is a non-public port that can be used by an instance of FibonacciSystem to access the
optional instance(s) of Viewer.
External links
• General information on UML [2] including the official UML 2.0 specification. See especially the large section on
Composite Structures.
• The Xholon open-source project maintains a set of links [3] having to do with composite structure.
References
[1] OMG (2008). OMG Unified Modeling Language (OMG UML), Superstructure, V2.1.2 (http:// www. omg. org/ spec/ UML/ 2. 1. 2/
Superstructure/ PDF) p.161-192.
[2] http:/ / www. uml. org/
[3] http:/ / www. primordion. com/ Xholon/ resources/ links. html#UML+ 2. 0+ Composite+ Structure%2C+ Ports%2C+ etc.

Article Sources and Contributors 3
Article Sources and Contributors
Composite structure diagram Source: http://en.wikipedia.org/w/index.phpoldid=354174219 Contributors: Badgernet, Dawynn, DePiep, Epbr123, KenSWebb, Kishorekumar 62, Mark
Renier, Mdd, Qualc1, SAE1962, 15 anonymous edits
Image Sources, Licenses and Contributors
File:Composite Structure Diagram.png Source: http://en.wikipedia.org/w/index.phptitle=File:Composite_Structure_Diagram.png License: Public Domain Contributors: [:w:User:KenSWebb
License
Creative Commons Attribution-Share Alike 3.0 Unported
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