[JWPA-1]의존성 주입(Dependency injection)

1. Java

2. Web

4. Programming

5. Advanced

7. Week01

8. Dependency Injection 의존성

9. 주입

10. 조영호

11. snatcher@nhn.com

13. Dependency

15. Dependency

16. 변경

18. Dependency in OO

19. Method Call

20. Object A

21. Object B

22. Object A

23. Object B

24. depends on

26. in Code

27. public class MovieLister { public ListMovie findAll() { ... } } public class MovieFinder { private MovieLister lister; public void moviesDirectedBy(String title) { ListMovie allMovies = lister.findAll(); ... } } Dependency

29. class Lecture Class Standard Grader Dependency C o d e Rev i ew

31. C o d e Rev i ew

32. class Lecture Class Standard Grader Dependency Class PassFail Grader

33. Coupling결합도

34. = Coupling

35. Object A

36. Object B

37. Dependency

39. = Coupling

40. Object A

41. Object B

42. Dependency

43. Coupling은

44. 반드시

45. 필요

46. OO의

47. 기반은

49. 객체와

50. 객체

51. 간의

52. 메시지

53. 전송

55. Goal

56. 의존성을

57. 없애는

58. 것이

59. 아니라

60. 결합도를

61. 낮추는

62. 것

63. = Coupling

64. Object A

65. Object B

66. Dependency

68. Tight Coupling?

69. 대상에

70. 대해

72. 더

73. 많이

74. 가정해야하는

75. 것

77. class Lecture Class Standard Grader Dependency P ro bl e m

78. Class Dependency

79. P ro bl e m

80. class Lecture Class Standard Grader Dependency Class PassFail Grader Class 대상

81. 수정

82. P ro bl e m

83. class Lecture Class Standard Grader Dependency Class PassFail Grader Tight Coupling Dependency

84. S o l u t i o n

85. class Lecture Class Standard Grader Class PassFail Grader Dependency Abstraction Loose Coupling

86. S o l u t i o n

87. class Lecture Class Standard Grader Class PassFail Grader Dependency Abstract Class interface Loose Coupling

88. S o l u t i o n

89. class Lecture Dependency Abstract Class interface Loose Coupling 클래스에

90. 대한

91. 가정

92. 제거

93. 단지

94. 행위에

95. 대해서만

96. 가정

98. Interface? Discussion

99. Behavior Discussion

100. class Lecture grade() Lecture의

101. 입장에서

103. Grade를

104. 산출하는

105. 동일한

106. 행위를

107. 제공하는

109. 모든

110. 객체와

111. 협력

112. 가능

113. Discussion class class class

114. class Lecture grade() Lecture의

115. 입장에서

117. Grade를

118. 산출하는

119. 동일한

120. 인터페이스를

121. 제공하는

123. 모든

124. 객체와

125. 협력

126. 가능

128. class Lecture grade() Lecture는

130. 다양한

131. 객체들과

132. 협력

133. 가능

137. 다양한

138. 객체들과

139. 협력

140. 가능하기

141. 때문에

143. 설계가

144. 유연함

148. 다양한

149. 상황에서

150. 재사용이

151. 가능

153. class Lecture grade() 단,

154. Lecture가

156. 구체적인

157. 클래스와

158. 결합되면

160. 위에서

161. 나열한

162. 장점을

163. 누릴

164. 수

165. 없음

169. 구체적인

170. 클래스가

171. 아니라

172. 행위에만

173. 의존해야

174. 함

176. Program to an interface, not implementation

177. class Lecture grade() Java interface Discussion class class class interface

178. Refactoring

179. P ro bl e m

180. class Lecture Class StandardGrader Class PassFailGrader interface Grader Create Dependency Dependency Use Tight Coupling Class Dependency

181. S o l u t i o n

182. class Lecture Class StandardGrader Class PassFailGrader interface Grader Create Dependency Dependency Use Separate Use From Construction

184. class Lecture Class StandardGrader Class PassFailGrader interface Grader Create Dependency Dependency Use Client Dependency Use Separate Use From Construction

186. class Lecture Class StandardGrader Class PassFailGrader interface Grader Dependency Use Client Dependency Use Separate Use From Construction Create Dependency

188. class Lecture Class StandardGrader Class PassFailGrader interface Grader Dependency Use Client Dependency Use Separate Use From Construction Create Dependency inject Dependency

189. Refactoring

190. Lecture lecture = new Lecture(new StandardGrader(), 80, 90, 65); String grade = lecture.grade(); Lecture lecture = new Lecture(new PassFailGrader(), 80, 90, 65); String grade = lecture.grade(); Lecture의 Client가 Lecture가 사용할(Use) Grader를 생성(Create)한 후 Lecture에게 주입 (Dependency Injection)

191. Program to an interface, not implementation Dependency Injection

192. Lecture lecture = new Lecture(new StandardGrader(), 80, 90, 65); String grade = lecture.grade(); Lecture lecture = new Lecture(new PassFailGrader(), 80, 90, 65); String grade = lecture.grade(); Lecture를

193. 사용하는

194. 모든

195. 곳에서

197. 이런

198. 일을

199. 하기

200. 귀찮겠죠?

203. class Lecture Class StandardGrader Class PassFailGrader interface Grader Dependency Use Client Dependency Use Dependency Injection Framework inject Dependency

204. Spring

205. @Controller public class ManageBookController { @Autowired private BookstoreService bookstoreService; @Autowired private CategoryService categoryService;

206. Dependency Injection Interface Discussion Flexibility Testability Reusability

207. Interface Dynamic Type Language Discussion

208. class Lecture: def __init__(self, grader, scores): self.scores = scores self.grader = grader def grade(self): return self.grader.grade(self.scores) class StandardGrader: def grade(self): ... class PassFailGrader: def grade(self): ... ex) Python

[JWPA-1]의존성 주입(Dependency injection)

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