CSC305 Lecture 05

Individual Software Design and Development
Logger
(202409)

Transcript

1. Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.info o ffi ce: 14 -227 CSC 305 Individual Software Design and Development Lecture 05. Logging
2. Previously
3. Maven File and Directories 3
4. Jsoup | Parser for HTML 4 https://github.com/CSC3100/Tool-Maven
5. JavaParser | Parser for Java Source Code 5 https://github.com/CSC3100/Tool-Maven
6. JFreeChart | Appealing charts 6 https://github.com/CSC3100/Tool-Maven
7. Weka | Machine Learning 7 https://github.com/CSC3100/Tool-Maven
8. Logging
9. Problem 9
10. Problem 10
11. Bad Idea System.out.println 11 Messages
12. 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. 12
13. Good Idea 13 message 01 message 02 message 03 message 04 message 05
14. 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 14
15. Getting Started
16. SLF4J Logback | Add the dependency 16 https://github.com/CSC3100/Tool-Logging
17. SLF4J Logback | Logging 17 https://github.com/CSC3100/Tool-Logging
18. SLF4J Logback | Logging 18 https://github.com/CSC3100/Tool-Logging
19. Severity Level 19 TRACE DEBUG INFO WARN ERROR Severity
20. We want this 20 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 20
21. Maven File and Directories 21
22. 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. 22
23. 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. 23
24. ConsoleAppender 24 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 24 Appender
25. src/main/resources/logback.xml 25 https://github.com/CSC3100/Tool-Logging
26. SLF4J Logback | Logging 26
27. ConsoleAppender 27 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 27 Appender
28. Encoder
29. 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 29 https://github.com/CSC3100/Tool-Logging
30. src/main/resources/logback.xml 30 https://github.com/CSC3100/Tool-Logging
31. SLF4J Logback | Logging 31
32. FileAppender
33. Next 33 trace() debug() info () warn () error() message 01 message 02 message 03 message 04 message 05 Logger Appender Appender
34. src/main/resources/logback.xml 34 https://github.com/CSC3100/Tool-Logging
35. SLF4J Logback | Logging 35
36. Full Solution 36 trace() debug() info () warn () error() message 01 message 02 message 03 message 04 message 05 Logger Appender Appender Appender
37. Questions 37
38. Lab 05. Logger
39. Logger 39 a) Review (and reuse as needed) my code from https://github.com/CSC3100/Tool-Logging b) Include logging elements into your Tic-Tac-Toe code ( try trace/debug and warn/error ) c) Print to screen and save logs on a File.
40. Let’s Work 40
41. CSC 305 Individual Software Design and Development Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Summer 2024 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.