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CPSC 875 John D. McGregor Design Concept. Functional decomposition.
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Transcript of CPSC 875 John D. McGregor Design Concept. Functional decomposition.
CPSC 875
John D. McGregorDesign Concept
Functional decomposition
Utility tree
• http://arnon.me/2012/04/utility-trees-quality-attributes/
• A utility tree lists a set of prioritized quality attributes, scenarios about each quality attribute, and a rating for the risk and criticality
Reference architecture
http://gmsec.gsfc.nasa.gov/architecture.php
Reference architecture - 2
Styles and patterns
• An architecture style and a pattern are very similar
• A pattern may have more information, particularly more information about trade-offs among attributes.
Logical/Physical
• Separate processes• Separate hardware• Usually have multiple processes on single
hardware element• Seldom have single process on multiple
hardware• Start at the logical level• Then conform to physical deployment
environment
Static/Dynamic
• Structures are static• Flows are dynamic• Modularity is a property of the static • Latency is a property of the dynamic
Ubiquitous architecture styles
• Layers
Ubiquitous architecture styles
• Client/Server
client server DB
request
return
Master/Slave
• http://hudson-ci.org/docs/HudsonArch-Execution.pdf
Model-View-Controller
• http://developer.apple.com/library/mac/#documentation/General/Conceptual/DevPedia-CocoaCore/MVC.html
• http://www.dossier-andreas.net/software_architecture/mvc.html
• As anti-pattern– http://broadcast.oreilly.com/2008/10/mvc-as-anti-pattern.html
MVC
What are the essentials?
• Separation of data from presentation– Have multiple views
• Separation of control from presentation– Have multiple controllers
• Attributes– Extensible
System Model
Decomposition• Our value computation is an interactive system. So we can start with MVC from
slide 16 and decompose from there.
Controller
ModelView
Controller
ModelData EditorSystem
menuProperties
editorController
Editor ModelData EditorSystem menu
Properties editor
ControllerController
ControllerControllerController
Extension
System Model
Controller
Editor ModelData EditorSystem menu
Properties editor
ControllerControllerController
System Model
Controller
Editor ModelData EditorSystem menu
Properties editor
ControllerControllerController
DataBase
Pipe and filter
• Graphics pipeline
• http://msdn.microsoft.com/en-us/library/ff963548.aspx
Compilation
Call and return architecture
aadl tutorial
• http://aadltutorial.com/introduction-to-aadl-and-osate
• http://www.openaadl.org/post/2013/04/15/aadl-tutorial/
• rtg.cis.upenn.edu/hasten/hces04/AADL%20ARO2.ppt