Desingn Pattern in Ruby 3장 Template Pattern 발표 1월 4일(토), 강남 토즈

1. 루비디자인패턴:템플릿패턴
김대권
propellerheaven@gmail.com

2. 템플릿패턴

3. 시나리오
레포트생성기

4. HTMLReport
간단한월례보고서생성기
제목과본문필요
HTML포맷만잘출력

5. Report클래스
classReport
definitialize
@title='MonthlyReport'
@text=['Thingsaregoing','really,reallywell.']
end
defoutput_report
puts('html')
puts('head')
puts(title#{@title}/title)
puts('/head')
puts('body')
@text.eachdo|line|
puts(p#{line}/p)
end
puts('/body')
puts('/html')
end
end

6. Report클래스(cont.)
report=Report.new
report.output_report

7. 하지만현실은…

8. 다양한출력형식?
이렇게도해야하고
저렇게도해야하고
나중엔그렇게도해야할지도모르는

9. 월례리포트생성기
HTML포맷
Text포맷

10. Report클래스
일단은고치고보자

11. 수정된Report클래스
defoutput_report(format)
ifformat==:plain
puts(***#{@title}***)
elsifformat==:html
puts('html')
puts('head')
puts(title#{@title}/title)
puts('/head')
puts('body')
else
raiseUnknownformat:#{format}
end
@text.eachdo|line|
ifformat==:plain
puts(line)
else
puts(p#{line}/p)
end
end
ifformat==:html
puts('/body')
puts('/html')
end

12. 회고
if문을사용한분기
모든처리를outputreport에서하고있음
뭔가이게아닌것같은데…모르겠다
…

13. 다시월례리포트생성기
HTML로보내주세요.
Text로도보내주세요.
RTF가필요해요.
PostScript포맷이필요해요.
…

15. 템플릿패턴

16. 레포트생성과정
1. Outputsanyheaderinformationrequiredbythespecificformat.
2. Outputthetitle.
3. Outputeachlineoftheactualreport.
4. Outputanytrailingstuffrequiredbytheformat.

17. outputreportMethod
defoutput_report
output_start
output_head
output_body_start
output_body
output_body_end
output_end
end

18. AbstractMethod
defoutput_start
raise'Calledabstractmethod:output_start'
end
defoutput_head
raise'Calledabstractmethod:output_head'
end
defoutput_body_start
raise'Calledabstractmethod:output_body_start'
end
defoutput_line(line)
raise'Calledabstractmethod:output_line'
end
defoutput_body_end
raise'Calledabstractmethod:output_body_end'
end
defoutput_end
raise'Calledabstractmethod:output_end'
end

19. HTMLReport
classHTMLReportReport
defoutput_start
puts('html')
end
defoutput_head
puts('head')
puts(title#{@title}/title)
puts('/head')
end
defoutput_body_start
puts('body')
end
defoutput_line(line)
puts(p#{line}/p)
end
defoutput_body_end
puts('/body')
end
defoutput_end
puts('/html')

20. TextReport
classPlainTextReportReport
defoutput_start
end
defoutput_head
puts(****#{@title}****)
puts
end
defoutput_body_start
end
defoutput_line(line)
putsline
end
defoutput_body_end
end
defoutput_end
end
end

21. Report생성하기
report=HTMLReport.new
report.output_report
report=PlainTextReport.new
report.output_report

22. 템플릿패턴클래스다이어그램

23. HookMethods
상속클래스에서오버라이드해서사용할수도있음
기본기능을제공

24. Report클래스
classReport
...
defoutput_start
end
defoutput_body_start
end
...
defoutput_body_end
end
defoutput_end
end
end

25. PlainTextReport
outputbodystart와outputbodyend는빈메소드
HTML레포트에서body태그가들어가는메소드

26. PlainTextReport
classPlainTextReportReport
defoutput_start
end
defoutput_head
puts(****#{@title}****)
puts
end
defoutput_line(line)
puts(line)
end
defoutput_end
end
end

27. DuckTyping
오리같이생겼고,
꽥꽥대면
오리

28. 정적타입언어의비용
1. 타입선언
2. 프로그램이시스템에강하게묶이는문제

29. emptyMethod예제

30. Java예제
publicclassEmpty
{
publicbooleanisEmpty(Strings)
{
returns.length()==0;
}
}

31. Ruby예제
defempty?(s)
s.length==0
end

32. RubyvsJava
DuckTyping에서는length가있는모든클래스에서사용가능

33. UnitTest
테스트는어느언어에서건필수
xUnit

34. Setup
classEmptyTestTest::Unit::TestCase
defsetup
@empty_string=''
@one_char_string='X'
@long_string='TheraininSpain'
@empty_array=[]
@one_element_array=[1]
@long_array=[1,2,3,4,5,6]
end
...
end

35. Test
classEmptyTestTest::Unit::TestCase
...
deftest_empty_on_strings
assertempty?(@empty_string)
assert!empty?(@one_char_string)
assert!empty?(@long_string)
end
deftest_empty_on_arrays
assertempty?(@empty_array)
assert!empty?(@one_element_array)
assert!empty?(@long_array)
end
end

36. 함정
하나에서부터시작하기
이예제에서는HTML에서시작하기
모든경우를커버하려고하지말것

37. TemplatesintheWild

38. Webrick서버
classHelloServerWEBrick::GenericServer
defrun(socket)
socket.print('HelloTCP/IPworld')
end
end
s=HelloServer.new(:Port=2000)
trap(INT){s.shutdown}
s.start

39. RubyinitializeMethod

40. Thankyou