Design Goals & System Decomposition

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Virtual Machine • The terms layer and virtual machine can be used interchangeably • Also sometimes called “level of abstraction”. • A virtual machine is an abstraction that provides a set of attributes and operations • A virtual machine is a subsystem connected to higher and lower level virtual machines by "provides services for" associations. © 2006 Bernd Bruegge Software Engineering WS 2006/2007 24
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 Machine 4 . Virtual Machine 3 Virtual Machine 2 Virtual Machine 1 Existing System
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 26 and 27: Building Systems as a Set of Virtua
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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