System Design: Architectures and Archetypes

116 Pages·1999·1.09 MB·English

System Design:
Architectures and
Archetypes
Stephen J. Mellor
Project Technology, Inc.
http://www.projtech.com
Stephen J. Mellor
Project Technology, Inc.
http://www.projtech.com
System Design: Architectures and Archetypes
PROJECT TECHNOLOGY, INC.
This tutorial shows you how to:
v identify the characteristics that
determine the system design;
v engineer the system-wide design
to meet performance constraints;
v model the system-wide design—
the software architecture;
v build archetypes to produce
efficient code.
2
Application-Independent Software Architecture
PROJECT TECHNOLOGY, INC.
Physical
On
Telephone
Hook
Off
Hook
Application
Model
Code
Architecture
3
Properties
PROJECT TECHNOLOGY, INC.
Executable
UML models
Translation
according to
rules
Separation of
application from
architecture
Code
4
What’s in the Architecture?
PROJECT TECHNOLOGY, INC.
The architecture comprises:
v
an execution engine plus
v
a set of archetypes.
Execution Engine Archetypes
5
Archetypes
PROJECT TECHNOLOGY, INC.
Archetypes define the rules for translating the application
into a particular implementation.
placeholder introduced by ${...}
.Function Class
text
Class ${Class.name} :
(which
public ActiveInstance {
happens to be
private: C++)
.invoke PrivateDataMember( Class )
… …
.Function PrivateDataMember( inst_ref class )
}; .select many PDMs from instances
of Attribute related to Class
.for each PDM in PDMs
${PDM.Type} ${PDM.Name};
.endfor
6
Application-Independent Software Architecture
PROJECT TECHNOLOGY, INC.
The software architecture is independent of the
semantics of the application.
This offers:
v early error detection through verification
v
reuse of the architecture
v
faster performance tuning
v
faster integration
v
faster, cheaper retargeting
7
Table of Contents
The Software Architecture
Archetype Language
Architectural Styles
A Direct Translation
Selecting an Architecture Specifying the Architecture
Performance Requirements An Indirect Translation
System Construction
Executable Domain Models
Model Execution
The Shlaer-Mellor Method
Capturing the Models
The Software Architecture
Challenges of Real-Time Development
PROJECT TECHNOLOGY, INC.
How can we both:
v provide required
functionality
and
v meet real-time
performance
constraints?
F
(Re-)organize
the software.
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