CSC509 Lecture 08 - Speaker Deck

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Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.info o ffi ce: 14 -227 CSC 508/9 Software Engineering (Design & Deployment) Lecture 08. Software Product Line

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De f inition • A softw a re product line (SPL) is a collection of softw a re systems th a t sh a re common fe a tures a nd a re developed from a single set of core a ssets: • Go a l. The go a l of a n SPL is to cre a te multiple products with less development e ff ort by reusing the development e ff ort put into gener a l components a nd services. 2

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JetBrains 3

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Review

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Code 5 https://github.com/ javiergs/CSC5090

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Code 6

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Feedback • Do not cre a te objects from a Bl a ckbo a rd. It is a Singleton for a re a son • Use inherit a nce for PropertyCh a ngeSupport • Do not m a ke a cl a ss observer of itself - it is wired! • Be more selective with your glob a l v a ri a bles ( a tributes). Remember the de f inition of a ttribute • Ask: Wh a t this cl a ss does? C a n you a nswer in a simple st a tement. • Cle a n your code - do not commit (submit) unused methods or commented code or sever a l empty lines. It provides a b a d impression. 7

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Clean Code Re a d a bility • DRY • KIS • SRP • Comments • Error H a ndling with a Logger 8 Metrics • LOC (eLOC, lLOC) • CC • A • Inst a bility • D

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Design P a tterns Clean Design 9

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Tools Maven

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• The project object model (POM) f ile describes a project a nd its dependencies. • A st a nd a rdized directory form a t. • Repositories where third-p a rty softw a re is stored a nd discovered. 11

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Maven File and Directories 12

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Create a project with Maven support 13

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POM.xml 14

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Maven Repository 15

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Adding a New Dependency 16

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Right-Click POM.xml 17

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Tools Logger

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Problem 19

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Problem 20

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Bad Idea System.out.println 21 Messages

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Logging • Recording events, a ctions, or mess a ges th a t occur during the execution of a progr a m. • Proper logging is essenti a l for m a int a ining a nd troubleshooting a pplic a tions e ff ectively throughout their lifecycle. 22

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Good Idea 23 message 01 message 02 message 03 message 04 message 05

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SLF4J Logback • St a nds for Simple Logging F a c a de for J a v a • It provides a uni f ied interf a ce for logging oper a tions, a llowing developers to write logging code without binding their a pplic a tion to a speci f ic logging implement a tion. 24

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SLF4J Logback | Add the dependency 25 https://github.com/CSC3100/Tool-Logging

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SLF4J Logback | Logging 26 https://github.com/CSC3100/Tool-Logging

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SLF4J Logback | Logging 27 https://github.com/CSC3100/Tool-Logging

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Severity Level 28 TRACE DEBUG INFO WARN ERROR Severity

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We want this 29 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 29

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Maven File and Directories 30

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Resources Folder • The resources folder in a M a ven project stores non-source-code f iles th a t your a pplic a tion needs, such a s con f igur a tion f iles, property f iles, im a ges, a nd other resources. • These f iles a re included in the f in a l build output a nd a v a il a ble on the cl a ssp a th a t runtime. 31

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src/main/resources/logback.xml • logb a ck.xml is a con f igur a tion f ile for SLF4J Logb a ck. • It de f ines how logging should be h a ndled, including log levels, a ppenders (where logs a re written), a nd log form a ts. • When your a pplic a tion st a rts, SLF4J Logb a ck a utom a tic a lly looks for this con f igur a tion f ile. 32

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src/main/resources/logback.xml 33 https://github.com/CSC3100/Tool-Logging

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SLF4J Logback | Logging 34

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ConsoleAppender 35 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 35 Appender

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Encoder

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Logstash Logback Encoder | POM.xml • Let’s use a nother libr a ry to t a ke a dv a nt a ge of extr a encoders • form a t Spring Boot logs in JSON form a t 37 https://github.com/CSC3100/Tool-Logging

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src/main/resources/logback.xml 38 https://github.com/CSC3100/Tool-Logging

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SLF4J Logback | Logging 39

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FileAppender

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Next 41 trace() debug() info () warn () error() message 01 message 02 message 03 message 04 message 05 Logger Appender Appender

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src/main/resources/logback.xml 42 https://github.com/CSC3100/Tool-Logging

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SLF4J Logback | Logging 43

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Questions 46

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CSC 509 Software Engineering Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Fall 2024 Copyright. These slides can only be used as study material for the class CSC509 at Cal Poly. They cannot be distributed or used for another purpose.