The document describes Simple-Spring-Memcached, a library that enables caching functionality using memcached with minimal configuration in Spring applications. It provides annotations to cache method return values and parameters across layers in a transparent way. The presentation provides an overview of the library's features and how to use its annotations to cache, invalidate, and update cached values.

1. Simple-Spring-Memcached http://code.google.com/p/simple-spring-memcached/ A library that enables your code to benefit from distributed caching (via memcached), with minimal configuration and simple annotations.

2. Bio Nelz Carpentier

3. Sr. Software Engineer at Widgetbox, Inc

4. 10+ Years as a Software Engineer

5. http://www.nelz.net/

6. http://www.twitter.com/nelz9999

7. http://www.linkedin.com/in/nelz9999

8. Target Audience Technical Folks

9. Familiar with Spring

10. May be interested in adding Memcached

11. Understand the basics of Caching

12. Understand the basics of Distributed Caching

13. Target Code / Infrastructure Java

14. Spring

15. Serializable / Externalizable Objects

16. High-Read, Low-Write

17. You control (or can wrap) the methods you want to cache

18. Expensive Read Operations

19. Operational Ability to Support Memcached

20. SSM's Niche

21. Motivation Broke New Ground?

22. Share My Learnings

23. Self-Evident Concept

24. Not Too Smart Willing to do the work

25. Shoulders of Giants Build Maven

26. Cobertura Test TestNG

27. EasyMock

28. Mirror Runtime Spy Memcached

29. Spring / AspectJ

30. Log4J

31. Desired Characteristics of Caching Needed in many layers

32. Should be transparent to main code flow

33. Similar characteristics Logging

34. Security Cross-cutting concern?

35. AOP to the Rescue!

36. Configure the ApplicationContext <import resource=&quot;classpath:simplesm-context.xml&quot; />

37. <bean id=&quot;memcachedConnectionBean&quot; class=

38. &quot;net.nelz.simplesm.config.MemcachedConnectionBean&quot;>

39. <property name=&quot;consistentHashing&quot; value=&quot;true&quot; />

40. <property name=&quot;nodeList&quot; value=&quot;127.0.0.1:11211 127.0.0.1:11311&quot; />

41. </bean>

42. <aop:aspectj-autoproxy />

43. Pseudocode of Read Through Scenario $key = calculateValueCacheName()

44. if cacheHasKey($key), return getFromCache($key)

45. $value = doExpensiveRequestForValue()

46. storeInCache($key, $value)

47. return $value

48. Gets info out of the cache

49. Also back door of putting info into the cache

50. [PS: Pertinent Negative Null]

51. Generating Keys 255 Characters

52. Key + Namespace + Other Characters (~16)

53. No Spaces

54. Default: toString()

55. Preferred: @CacheKeyMethod

56. Why Namespaces? Avoid Collisions

57. Example: Primary Keys

58. Bad: 123 vs 123

59. Good: Vet:123 vs Pet:123

60. RTA - Example @ReadThroughAssignCache(

61. assignedKey = &quot;InTheWindow&quot;,

62. namespace = &quot;DOG&quot;,

63. expiration = 300)

64. Dog getDogInWindow() {

65. ...

66. }

67. RTS – Example 1 @ReadThroughSingleCache(

68. keyIndex = 0,

69. namespace = &quot;VETS&quot;,

70. expiration = 300)

71. Vet getVet(Long id) {

72. ...

73. }

74. RTS – Example 2 @ReadThroughSingleCache(

75. keyIndex = 1,

76. namespace = &quot;VETS&quot;,

77. expiration = 300)

78. Vet getVet(Credentials cred, Long id) {

79. ...

80. }

81. Cardinality Options 1-to-1, 1-to-Many, Invariant “ KEY” -> Y

82. “ KEY” -> List<Value>

83. @ReadThroughAssignCache 1-to-1, 1-to-Many, Parameterized Key -> Value

84. Key -> List<Value>

85. @ReadThroughSingleCache Many-to-Many List<Key> -> List<Value>

86. @ReadThroughMultiCache

87. List -> List Contract Requires: Agree in Length

88. Agree in Sequence Each Key/Value Pair is an individual cache entry

89. No Map support (yet?)

90. Subset Pass-Through

91. RTM - Example @ReadThroughMultiCache(

92. keyIndex = 0,

93. namespace = &quot;VETS&quot;,

94. expiration = 300)

95. List<Vet> getVet(List<Long> ids) {

96. ...

97. }

98. Pseudocode of Invalidate Scenario $key = calculateValueCacheName()

99. doUnderlyingOperations()

100. deleteFromCache($key)

101. Removes info from the cache

102. IAC – Example @InvalidateAssignCache(

103. assignedKey = &quot;InTheWindow&quot;,

104. namespace = &quot;DOG&quot;)

105. void removeFromWindow(Dog dog) {

106. ...

107. }

108. ISC – Example @InvalidateSingleCache(

109. keyIndex = 0,

110. namespace = &quot;FISH&quot;)

111. void died(Fish fish) {

112. ...

113. }

114. IMC – Example @InvalidateMultiCache(

115. keyIndex = 1,

116. namespace = &quot;DOG&quot;)

117. void sellLitter(Buyer to, List<Dog> dogs) {

118. ...

119. }

120. Pseudocode for Update Scenario doUnderlyingOperations()

121. $key = calculateValueCacheName()

122. $value = harnessValueToStore()

123. storeInCache($key, $value)

124. Puts info into the cache

125. UAC - Example @UpdateAssignCache(

126. assignedKey = &quot;InTheWindow&quot;,

127. dataIndex = -1,

128. namespace = &quot;DOG&quot;,

129. expiration = 300)

130. Dog chooseDogForWindow() {

131. ...

132. }

133. USC - Example @UpdateSingleCache(

134. keyIndex = 0,

135. dataIndex = 0,

136. namespace = &quot;FISH&quot;,

137. expiration = 300)

138. void addToInventory(Fish fish) {

139. ...

140. }

141. UMC - Example @UpdateMultiCache(

142. keyIndex = 2,

143. dataIndex = -1,

144. namespace = &quot;DOG&quot;,

145. expiration = 300)

146. List<Dog> newLitter(Dog mom, Dog dad, List<Long> ids) {

147. ...

148. }

149. DEMO DEMO...

150. Demo...

151. Demo...

152. Demo.

153. Protection from Exceptions Exceptions from (your) underlying code should flow as normal

154. Exceptions within the caching code should be invisible to user, other than via log

155. Commons-logging / Log4J

156. Best Practices Externalizable (!!!) Up to 8x faster!?! Single Canonical Representation How to do aggregate collections Invalidates on Delete

157. Updates on Save

158. What SSM Doesn't Do Stampede Protection or Soft Locks

159. Namespace Invalidation

160. Multi-Invalidation / Method

161. Multi-Parameter Keys

162. Possible Future Features Multiple Logical Memcacheds

163. Cache Observers

164. Second-level cache

165. Version 2.0 Changes Package Structure

166. Remove Index Params, Adopt Annotations -1 -> @ReturnValueKeyProvider

167. 0+ -> @ParameterValueKeyProvider Key Calculation Spring Bean Nameable

168. @ReturnValueKeyProvider(

169. keyProviderBeanName = “myBeanName”

170. )

171. Other Projects to Know About Statsproxy - Monitoring Supported by Gear6 Brutis - Benchmarking Also by Gear6 Xmemcached Young Whalin Old, Stable

172. Not Maintained?

174. Presentation and Demo Files Blog Post: http://nelz.net/2009/10/02/ssm-at-svcc/

175. On Project Page: http://code.google.com/p/simple-spring-memcached/ Presentation

176. Demo Code

177. Also on SlideShare

178. Gliffy.com

179. Photo Credits http://www.flickr.com/photos/adulau/3086751588/

180. http://www.flickr.com/photos/edrabbit/3440426582/

181. http://www.flickr.com/photos/nielsvk/258851215/

182. http://www.flickr.com/photos/origomi/22442743/

183. http://www.flickr.com/photos/samcrockett/2213593924/

184. http://www.flickr.com/photos/themarkpike/83868756/

185. http://www.flickr.com/photos/bohman/210977249/

186. http://www.flickr.com/photos/red5standingby/235794106/

187. http://www.flickr.com/photos/roblee/375671072/

188. http://www.flickr.com/photos/andyandorla/239043213/

189. http://www.flickr.com/photos/chrisdag/1225937650/

190. http://www.flickr.com/photos/mechanikat/2727944748/

191. http://www.flickr.com/photos/expressmonorail/3694867130/

192. http://www.flickr.com/photos/ttstam/3833225072/

193. http://www.flickr.com/photos/vernhart/1574355240/

194. Questions Questions?