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. Logging
5. Problem 5
6. Problem 6
7. Bad Idea System.out.println 7 Messages
8. 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. 8
9. Good Idea 9 message 01 message 02 message 03 message 04 message 05
10. 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 10
11. Getting Started
12. SLF4J Logback | Add the dependency 12 https://github.com/CSC3100/Tool-Logging
13. SLF4J Logback | Logging 13 https://github.com/CSC3100/Tool-Logging
14. SLF4J Logback | Logging 14 https://github.com/CSC3100/Tool-Logging
15. Severity Level 15 TRACE DEBUG INFO WARN ERROR Severity
16. We want this 16 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 16
17. Maven File and Directories 17
18. 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
19. 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
20. ConsoleAppender 20 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 20 Appender
21. src/main/resources/logback.xml 21 https://github.com/CSC3100/Tool-Logging
22. SLF4J Logback | Logging 22
23. ConsoleAppender 23 message 01 message 02 message 03 message 04 message 05 trace() debug() info () warn () error() Logger 23 Appender
24. FileAppender
25. Next 25 trace() debug() info () warn () error() message 01 message 02 message 03 message 04 message 05 Logger Appender Appender
26. src/main/resources/logback.xml 26 https://github.com/CSC3100/Tool-Logging
27. SLF4J Logback | Logging 27
28. Full Solution 28 trace() debug() info () warn () error() message 01 message 02 message 03 message 04 message 05 Logger Appender Appender Appender
29. Encoder
30. 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 30 https://github.com/CSC3100/Tool-Logging
31. src/main/resources/logback.xml 31 https://github.com/CSC3100/Tool-Logging
32. SLF4J Logback | Logging 32
33. Questions 33
34. Lab 05. Logger
35. Logger 35 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.
36. Let’s Work 36
37. 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.