Presented at Clack Meetup #1

1. Clack:
glue for web apps
Clack Meetup #1 Eitaro Fukamachi

2. Thank you for coming.

3. I’m Eitaro Fukamachi
@nitro_idiot fukamachi

4. Topics
• What’s Clack?
• As an Abstraction Layer
• As a composable rule
• History

5. Clack

6. • Web application environment
• Intended to be a basement of frameworks
• Abstracts web servers
• Composability
Clack

7. Clack
(clackup
(lambda (env)
‘(200
(:content-type “text/plain”)
(“Hello, World”)))
:server :hunchentoot)

8. Clack
(clackup
(lambda (env)
‘(200
(:content-type “text/plain”)
(“Hello, World”)))
:server :hunchentoot)
Application

9. Clack
(clackup
(lambda (env)
‘(200
(:content-type “text/plain”)
(“Hello, World”)))
:server :hunchentoot)
Application
Web server to run the application on

10. Web server
Abstract web servers
Application
Web server Web server
Application Application

11. Web server
Abstract web servers
Application
Web server Web server
Application Application
Clack

12. Composability
ApplicationRequest Response

13. Middleware
Middleware
Composability
ApplicationRequest Response

14. • Middleware wraps an application
• Middleware can be reused
• ex) access log, session manager
“Middleware”

15. History

16. We lived 4 ages.

17. • asdf-install or clbuild (not reliable)
• GitHub wasn’t popular
• Posted a bug to mailing-lists
• Many projects are abandoned or inactive
• We couldn’t tell if a library works with other
libraries
BQ (Before Quicklisp = the Stone Age)

18. • Quicklisp made installation of libraries
really easier
• It make sure libraries can load at least
AQ (the Tool Age)

19. • Hosted on GitHub
• Has many tests
• Tested on Jenkins
• Has a documentation
Clack was out 4 years ago

20. • We had Clack & Caveman1
• We had Quicklisp
• No DBI, No ORM (CLSQL was terrible)
• Many projects were abandoned
• Clojure already had Ring
Clack (the Bronze Age)

21. • Hunchentoot, Weblocks, web4r, RESTAS
• Most WAF were built on top of
Hunchentoot!!
• Is Hunchentoot reliable and everlasting?
Clack (the Bronze Age)

22. The Present Age
• We have ningle and Caveman2
• We have CL-DBI, SxQL, datafly and Integral
• We have Woo, a really fast web server
• We have CIM/Roswell and qlot
• Clack reached ver 1.0

23. • Moved many codes to an individual project
• Could reduce 1583 lines
• Made it stable
• Made it faster
• Started testing on
Clack v1.0

24. So, what’s next?

25. • We have everything we need to build a web
application
• Just try.
• Looking for a Common Lisp job? We’re
hiring!
The next move

26. Thanks.

27. EITARO FUKAMACHI
8arrow.org
@nitro_idiot fukamachi