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April 18, 20231
April 18, 2023April 18, 2023 Azusa, CAAzusa, CA
Sheldon X. Liang Ph. D.
Software Engineering Software Engineering in CS in CS at at APUAPU
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
CS 480 Software Engineering IICS 480 Software Engineering II
April 18, 20232
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
CS 480 (SE)CS 480 (SE)2 2 vs. Software Engineeringvs. Software Engineering
April 18, 20233
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering
What is a system What is systems engineering What is systems engineering process What we learn from systems engineering
Break down: Problem Definition (PRD)
Model&Interface: Problem Design (SDD)
Unit coding: Programming (SPP)
Put-together: Integration (SIP)
What we are going to do with DFD OT is the key to Software Construction
April 18, 20234
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering
What is a systemComponents - A purposeful collection of inter-related components working together to achieve some common objective.
External Entities - A system may include software, mechanical, electrical and electronic hardware and be operated by people.
External Dependencies - System components are dependent on other system components
Collaboration - The properties and behavior of system components are inextricably intermingled
problem requirements definition: identification of data & operation
April 18, 20235
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering
What is systems engineering
Systems Engineering (SE) is an interdisciplinary field of engineering, that focuses on the development and organization of complex artificial systems.
Systems Engineering integrates other disciplines and specialty groups into a team effort, forming a structured development process that proceeds from concept to production to operation and disposal.
Systems Engineering considers both the business and the technical needs of all customers, with the goal of providing a quality product that meets the user needs
Structured development process: Analysis vs Synthesis
April 18, 20236
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering What is systems engineering process
April 18, 20237
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering
What we learn from systems engineering
Break down: Problem Definition (PRD)
Model&Interface: Problem Design (SDD)
Unit coding: Programming (SPP)
Put-together: Integration (SIP)
April 18, 20238
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering
What we learn from systems engineering
April 18, 20239
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering
What we learn from systems engineering
VV
April 18, 202310
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering
What we learn from systems engineering
VVFrom Conceptual to Complete
From break-down to put-together
Software Construction
April 18, 202311
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering
What we learn from systems engineering
VRequirement Analysis
Functional Analysis/Allocation
Integration / Synthesis
April 18, 202312
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering
What we learn from systems engineering
VRequirement Analysis
Functional Analysis
Functional Allocation
Problem Definition (PRD)-- Identify external entities-- identify major components -- identify links (dataflow)
Problem Design (SDD)-- functional allocation -- activities & interface-- identify further components -- identify links
PRD & SDD
April 18, 202313
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering What we’re going to do with DFD
VV
April 18, 202314
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering What we’re going to do with DFD
V
April 18, 202315
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering What we’re going to do with DFD
SRS:-- External Entities Customer Keypad Card Reader Control System Customer Display Printout Dispenser Cash Dispenser
-- Functional Level-0 Auto Teller System
April 18, 202316
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering What we’re going to do with DFD
VSRS (Refined):-- External Entities-- Functional Level-1 Receive operator command Verify PIN from card Display customer options Prepare command Update display Prepare message Prepare printout Mange withdrawal
April 18, 202317
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering What we’re going to do with DFD
VSDD (description):The CheckPIN procedure handles the verification of the customer's Personal Identification Number (PIN) using data retrieved from the card's magnetic strip. The procedure invites the customer to enter their PIN using the keypad. If this does not match the PIN stored on the card, a limited number of retries is permitted, after which the card is confiscated as a security precaution. If the correct PIN is entered, the Services procedure is called.
April 18, 202318
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering What we’re going to do with DFD
VSDD (pseudo-code):PROCEDURE CheckPINCONSTANTS MAXPINS IS 3VARIABLES PINCounter IS NUMBERBEGIN read data from card set PINCounter to zero LOOP UNTIL PINCounter is equal to MAXPINS input PIN from customer keypad IF entered PIN matches card PIN THEN EXITLOOP ENDIF add 1 to PINCounter ENDLOOP IF PINCounter is equal to MAXPINS THEN confiscate customer's card ELSE CALL PROCEDURE Services ENDIFEND CheckPIN
April 18, 202319
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering
What we’re going to do with DFD
Problem Requirements Definition (PRD)
PRD0 = Major_Operation + ∑ External_entities
PRD* = ∑ Functional_allocation (tasks) + ∑ Dataflows
Software Design Document (SDD)
SDD = ∑ Functional_Description (strategic psuedo-code)
Software Project Plan
SPP = ∑ Scheduled Implementation (coding & testing plan)
April 18, 202320
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering What we’re going to do with DFD
Data Pool
Op1 Fun2 Op3 Fun4
Program = DataStructure + Algorithm:/* Data Pool */ … …void Op1 (… …) {}int Fun2 (… …){}void Op3 (… …){}float Fun4 (… …){}
int main (){ … …}
April 18, 202321
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering What we’re going to do with OOA and OOD
Data Pool
Op1 Fun2 Op3 Fun4
// Program=DataStructure + Algorithm:Class CLS1Public void Op1 (… …) { … } int Fun2 (… …) { … }private /* Data Pool */ … …}
Class CLS2public void Op3 (… …) { … } float Fun4 (… …) { … }Private /* Data Pool */ … …}
April 18, 202322
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering OT is the key to Software Construction
Object Technology is a widely-used approach to solving the problems of software construction. It involves the encapsulation of functionality and associated data as objects, and the classification of those objects into a hierarchy of classes. This makes it easier to control complexity, and encourages the development of flexible, robust, and re-usable components.
April 18, 202323
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering OT is the key to Software Construction
Object-Orientation
Object-Oriented Design
Object-Oriented Programming
Distributed Objects
Design Patterns
April 18, 202324
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering OT is the key to Software Construction
Object-Orientation
Object-Oriented Design
Object-Oriented Programming
Distributed Objects
Design Patterns
It takes a big picture approach to programming and design, rather than dwelling on language-specific details, and serves as a framework in the Object Technology theme.
April 18, 202325
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering OT is the key to Software Construction
Object-Orientation
Object-Oriented Design
Object-Oriented Programming
Distributed Objects
Design Patterns
standard techniques for the specification of software. This is based around a carefully-chosen subset of the UML (Unified Modeling Language), and places the techniques in a formal software engineering context.
April 18, 202326
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering OT is the key to Software Construction
Object-Orientation
Object-Oriented Design
Object-Oriented Programming
Distributed Objects
Design Patterns
This refers to the concepts and principles of object-oriented programming: 1. objects, methods, interfaces, messages, events, and threads.
2.some knowledge of the notations of the Unified Modeling Language (UML).
April 18, 202327
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering OT is the key to Software Construction
Object-Orientation
Object-Oriented Design
Object-Oriented Programming
Distributed Objects
Design Patterns
This is about object-oriented programming in the large:1. distribution of computation across remote servers. 2. software components: independent, self-contained units of software with tightly-specified interfaces, capable of late integration. 3. interoperability between components implemented in different languages and on different platforms.
April 18, 202328
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering OT is the key to Software Construction
Object-Orientation
Object-Oriented Design
Object-Oriented Programming
Distributed Objects
Design Patterns
This is advanced structure and behavior of object-oriented systems, covering both design and programming. It is based around the notion of a design pattern: an abstraction of a proven solution to a recurring problem in a specific context in system design. The applicability of these ideas is not restricted to object-oriented languages, This needs considerable experience in OOD and OOP programming.
Thank you very much!
Questions?
April 18, 202329
Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/
Software Engineering Software Engineering in CS in CS at at APUAPU
(SE)(SE)22: System Engineering vs Software Engineering: System Engineering vs Software Engineering