This document appears to be notes from a presentation on Clojure. It discusses key features of Clojure like how it differs from Lisp, its use of REPL for documentation, lambda functions and macros. A large portion of the document covers concurrency in Clojure, explaining concepts like STM, atoms and agents. It provides examples of using Clojure's STM functions like ref, deref, alter and compares them to handling concurrency in other languages like Scala. The notes conclude by mentioning side-effects and comparing Clojure to other JVM languages.

1. 2010 7 16

2. 2010 7 16

3. (acknowledgment)
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4. (who m)
http://atnd.org/events/99 http://qwik.jp/asakusarb/
http://www.slideshare.net/kakutani/kekkon-lt-by-kakutani
http://sites.google.com/site/kamenriderbenkyoukai/ http://taiyaki.ru/
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5. 2010 7 16

6. (about today-tolk)
Clojure
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7. (agenda today)
• Clojure
• Clojure
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8. (feature Clojure)
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9. (about Clojure)
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10. Clojure is Lisp
Reloaded!!
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11. (topic clojure)
•(deffrence Lisp)
• (use doc)
• (use lambda :with macro)
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12. (difference lisp)
• Clojure cons
• car, cdr
• cons cons
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13. (difference lisp)
• () nil
•t true
• do
•
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14. (convenience REPL)
REPL (doc func-name)
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15. (way lambda :with macro)
lambda
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16. (way lambda)
lambda
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17. (way lambda)
lambda
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18. (way lambda)
lambda
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19. (concurrency clojure)
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20. (why concurrency)
CPU
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21. (why function-programing)
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22. (case Scala )
Scala
Actor
Java
Scala
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23. (case clojure)
Clojure
(java.util.concurrency )
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24. (what concurrency-data-model)
•STM
•Atom
•Agent
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25. (what concurrency-data-model)
•STM
•Atom
•Agent
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26. (what STM)
STM
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27. (difficulty concurency)
$x = []
$lock = Lock.new
def push_pop(val)
$lock.lock
$x << val
retval = $x.pop
$lock.unlock
retval
end
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28. (difficulty conccurency)
$x = []
$lock = Lock.new
def push_pop(val)
$lock.lock
$x << val
retval = $x.pop
$lock.unlock
retval
end
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29. STM
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30. (why STM)
STM
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31. (about STM)
$x = STM.new []
STM
def push_pop(val)
retval = nil
$x.transaction do |v|
v << val
retval = v.pop
end
retval
end
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32. (about STM)
Thread A Thread B
$x.transaction do |v| $x.transaction do |v|
v << val v << val
retval = v.pop retval = v.pop
end end
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33. (about STM)
Thread A Thread B
$x.transaction do |v| $x.transaction do |v|
v << val v << val
retval = v.pop retval = v.pop
end end
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34. (about STM)
Thread A Thread B
$x.transaction do |v| $x.transaction do |v|
v << val v << val
retval = v.pop retval = v.pop
end end
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35. (about STM)
Thread A Thread B
$x.transaction do |v| $x.transaction do |v|
v << val v << val
retval = v.pop retval = v.pop
end end
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36. (about STM)
Thread A Thread B
$x.transaction do |v| $x.transaction do |v|
v << val v << val
retval = v.pop retval = v.pop
end end
Thread A $x
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37. (about STM)
Thread A Thread B
$x.transaction do |v| $x.transaction do |v|
v << val v << val
retval = v.pop retval = v.pop
end end
Thread B
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38. (defects STM)
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39. (case Clojure :STM)
ref :
deref :
ref-set :
dosync :
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40. (case Clojure :STM)
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41. (case Clojure :STM)
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42. (case Clojure :STM)
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43. (case Clojure :STM)
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44. (case Clojure :STM)
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45. (case Clojure :STM)
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46. (case Clojure :STM)
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47. (case Clojure :STM)
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48. (case Clojure :STM)
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49. (more Clojure :STM)
deref ref-set ?
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50. alter
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51. (about alter)
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52. (how alter)
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53. ?
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54. (more alter)
alter ref
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55. (otherwise alter)
alter ref
commute commute alter
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56. (how commute)
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57. (distinction :alter :commute)
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58. (distinction :alter :commute)
alter commute
commute
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59. (ref :vaidate)
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60. (how ref :validate)
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61. (how ref :validate)
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62. (how ref :validate)
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63. (how ref :validate)
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64. (how ref :validate)
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65. (how ref :validate)
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66. (caution transaction)
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67. (use :macro io! )
io!
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68. Haskell
I/O
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69. (care *side-effect*)
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70. (care *side-effect*)
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71. (last today-story)
Scala
S Java
Clojure
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72. 2010 7 16

73. 2010 7 16