Chapter 12: Requirements to Design

Requirements to Design

1. iteratively do the right thing, do the thing right
2. provoke early change
3. didnt all that analysis and modeling take weeks to do

Chapter 13 Logical Architecture & UML Package diagrams

Goals

1. introduce a logical architecture using layers
2. illustrate the logical architecture using UML

what is the logical architecture and layers

1. the logical architecture is the large-scale of the software classes into packages, subsystems and layers
2. A layer is a very coarse-grained grouping of classes, packages or subsystems that has cohensive responsibility for a major respect of the system
3. typical layer in an OO system include
   1. user interface
   2. application logic and domain objects
   3. technical service
4. strict/relaxed layered architecture

What is software architecture

An architectrue is the set of significant decisions about the organization of a software system, the selection of the structure elements and their interfaces by which ther system is composed, together with their behavior as specified in the collaboration among those elements, the composition of these structural and behavioral elements into progressively larger subsystems- these elements and their interfaces, their collaborations and their composition

Chapter 15 UML Interaction Diagram

Interaction Diagram

1. sequence Diagram
2. Communication Diagram

单例模式

found message, execution specification bar, sychronous message

Reply 用虚线

Messages to self

Object Creation & Destruction

Common Frame Operator

1. alt
2. loop
3. opt
4. par
5. region
   1. only one thread can run

Polymorphic Messages and Classes

Asychronous Calls(stick arrow) synchronous call(filled arrow)