Design Goals & System Decomposition

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Building Systems as a Set of Virtual Machines A system is a hierarchy of virtual machines, each using language primitives offered by the lower machines. Operating System, Libraries Virtual Machine4 Virtual Machine 3 Virtual Machine 2 Virtual Machine 1 Existing System
Closed Architecture (Opaque Layering) • Each virtual machine can only call operations from the layer below Design goals: Maintainability, flexibility. © 2006 Bernd Bruegge Software Engineering WS 2006/2007 C1ass1 attr op Class A attr op C1assC attr op C1ass2 attr op C1assE attr op C1ass3 attr op C1assD attr op C1assF attr op C1ass B attr op VM4 VM3 VM2 VM1 27
Page 1 and 2: Design Goals & System Decomposition
Page 3 and 4: Design is Difficult • There are t
Page 5 and 6: The Scope of System Design • Brid
Page 7 and 8: Overview System Design I (This Lect
Page 9 and 10: From Analysis to 1. Design Goals De
Page 11 and 12: Stakeholders have different Design
Page 13 and 14: Subsystem Decomposition • Subsyst
Page 15 and 16: Subsystem Interfaces vs API • Sub
Page 17: Subsystem Interface Object • Good
Page 20 and 21: Example of a Subsystem Decompositio
Page 22 and 23: Example of a Bad Subsystem Decompos
Page 24 and 25: Virtual Machine • The terms layer
Page 28 and 29: Opaque Layering in ARENA Interface
Page 30 and 31: Properties of Layered Systems • L
Page 32 and 33: Coupling and Coherence of Subsystem
Page 34 and 35: How to achieve high Coherence • H
Page 36 and 37: Additional Readings • E.W. Dijkst

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