CSC305 Lecture 15 - Speaker Deck

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Dr. Javier Gonzalez-Sanchez [email protected] www.javiergs.info o ffi ce: 14 -227 CSC 305 Individual Software Design and Development Lecture 15. Logger

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Assignment 03

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3 Assignment 03 is due on Friday November 14

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Assignment 03 4

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Assignment 03 | Example 1 | Tab 1 5 Bo a rdP a nel M a in Controller M a in01.j a v a Take the population values and divide them into three groups by first finding the largest and smallest values, then calculating the range between them, and finally using that range to set two cut- off points.

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Assignment 03 | Example 1 | Tab 2 6 Painful Useless Controller Main BoardPanel * java files colors to be calculated; * not showing them here Add inheritance and local variables, but only for the other classes in this folder

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Assignment 03 | Example 1 | Tab 3 7 👷 This space is empty for now

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Logging

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Problem 9

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Bad Idea System.out.println 10 Messages

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Good Idea 11 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. • We need to t a lk a bout the F a c a de P a ttern 12

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SLF4J Logback | Add the dependency 13 https://github.com/CSC3100/Tool-Logging

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SLF4J Logback | Logging 14 https://github.com/CSC3100/Tool-Logging

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We want this 15 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 15

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Maven File and Directories 17

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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. 18

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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. 19

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ConsoleAppender 20 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 20 Appender

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src/main/resources/logback.xml 21 https://github.com/CSC3100/Tool-Logging

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SLF4J Logback | Logging 22

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ConsoleAppender 23 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 23 Appender

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FileAppender

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Next 25 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 26 https://github.com/CSC3100/Tool-Logging

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SLF4J Logback | Logging 27

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Cloud-Based Log Management

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Next 29 trace() debug() info () warn () error() message 01 message 02 message 03 message 04 message 05 Logger Appender

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Cloud-Base Log Management • Cloud-b a sed log m a n a gement refers to the pr a ctice of collecting, storing, a n a lyzing, a nd m a n a ging log d a t a using cloud services. • This a ppro a ch lever a ges cloud computing to h a ndle the v a st a mounts of log d a t a 30

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betterstack.com/logs 31

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We need keys 32 String key = "XYZabc123259#$%#$Fcaskjhdux_2342445Calp";

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betterstack.com/logs 33

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betterstack.com/logs 34 WE6x9ya1dfMwRTouP9DEBmg

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HttpAppender Our very own creation Just for fun

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SLF4J Logback | Add the dependency 36 Just for JSON Support https://github.com/CSC3100/Tool-Logging

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src/main/resources/logback.xml 37 WE6x9ya1dfMwRTouP9DEB https://github.com/CSC3100/Tool-Logging

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javiergs.HttpAppender (Part 1/4) 38 https://github.com/CSC3100/Tool-Logging

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javiergs.HttpAppender (Part 2/4) 39 https://github.com/CSC3100/Tool-Logging

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javiergs.HttpAppender (Part 3/4) 40 https://github.com/CSC3100/Tool-Logging

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javiergs.HttpAppender (Part 4/4) 41 https://github.com/CSC3100/Tool-Logging

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logs.betterstack.com 42

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Full Solution 43 trace() debug() info () warn () error() message 01 message 02 message 03 message 04 message 05 Logger Appender Appender 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 45 https://github.com/CSC3100/Tool-Logging

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src/main/resources/logback.xml 46 https://github.com/CSC3100/Tool-Logging

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SLF4J Logback | Logging 47

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Questions 48

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Lab

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CSC 305 Individual Software Design and Development Javier Gonzalez-Sanchez, Ph.D. [email protected] Fall 2025 Copyright. These slides can only be used as study material for the class CSC305 at Cal Poly. They cannot be distributed or used for another purpose.