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TIL
  • README
  • Git
    • Basic
    • Remote Repository
    • Log & Diff
    • Rebase&Cherri-Pick
    • git-flow
  • DevOps
    • Monolithic vs MSA
    • Jenkins ์‹œ์ž‘ํ•˜๊ธฐ
    • Airflow ์‹œ์ž‘ํ•˜๊ธฐ
    • Airflow ์‹œ์ž‘ํ•˜๊ธฐ
    • Build Tools
      • maven
  • ๊ฐœ๋ฐœ ๋ฐฉ๋ฒ•๋ก 
    • TDD
  • Spring
    • IoC
    • Is Spring Bean Thread-Safe?
    • Spring Singleton
    • Component Scan
    • Spring Annotation
    • ์˜์กด ๊ด€๊ณ„ ์ฃผ์ž…(DI)
    • Lombok ํ™œ์šฉํ•˜๊ธฐ
    • Bean ์ƒ๋ช…์ฃผ๊ธฐ์™€ ์ฝœ๋ฐฑ
    • Bean Scope
    • AOP(1) - AOP๋ž€
    • AOP(2) - Aop Proxy
    • AOP(3) - Dynamic Proxy
    • AOP(4) - AspectJ
    • POJO
    • Spring ์„œ๋น„์Šค ๊ตฌ์กฐ
    • Transaction
    • JPA๋ž€?
    • JPA Entity
    • Spring Data JPA
    • Spring Data Specification
    • Model Mapping
    • Cache
    • restTemplate
    • YAML ํŒŒ์ผ ์„ค์ •
    • Spring Boot
      • H2 DB ์„ค์ •
      • ๋‹ค์ค‘ ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์„ค์ •
      • Mybatis ์—ฐ๋™ํ•˜๊ธฐ
    • Spring Batch
      • Batch ์‹œ์ž‘ํ•ด๋ณด๊ธฐ
      • Batch Job Flow
      • Job
      • Step
      • Batch Scope & Job Parameter
      • JobRepository์™€ ๋ฉ”ํƒ€ํ…Œ์ด๋ธ”
      • Chunk ์ง€ํ–ฅ ํ”„๋กœ๊ทธ๋ž˜๋ฐ
      • ItemReader
      • ItemProcessor
      • ItemWriter
      • Batch Schedular
      • Job๋ณ„ Bean๋“ฑ๋กํ•˜๊ธฐ
      • Batch ๊ตฌํ˜„์‹œ ๋ฐœ์ƒํ•œ ์˜ค๋ฅ˜ ์ •๋ฆฌ
      • Spring Batch Scaling
        • Multithread Job๊ตฌํ˜„์‹œ ์ด์Šˆ์‚ฌํ•ญ
    • Spring test
      • Junit5
        • ํ…Œ์ŠคํŠธ ์ด๋ฆ„ ํ‘œ๊ธฐ
        • ํ…Œ์ŠคํŠธ ๊ทธ๋ฃน ์‚ฌ์ด์˜ ๊ด€๊ณ„
        • ํƒœ๊ทธ์™€ ํ•„ํ„ฐ๋ง
        • ๋™์  ํ…Œ์ŠคํŠธ
        • ํ…Œ์ŠคํŠธ LifeCycle
        • ํ…Œ์ŠคํŠธ ๋ฉ”์„œ๋“œ
        • ํ…Œ์ŠคํŠธ ์ˆœ์„œ
        • AssertJ
        • ํ…Œ์ŠคํŠธ ๋ณ‘๋ ฌ ์‹คํ–‰
        • AssertJ
        • Mock
      • Spring Boot Test DB ๋ถ„๋ฆฌ
      • Spring Batch Test
  • Web Application
    • Web Server & WAS
    • ๊ด€๋ จ ๊ฐœ๋… - HTTP API, HTML, CSR, SSR
    • Servlet
    • JSP
    • Cookie And Session
    • ์˜ˆ์™ธํŽ˜์ด์ง€
    • Java Bean
    • JDBC
    • Connection Pool
    • ํŒŒ์ผ ์—…๋กœ๋“œ
    • Expression Language
    • JSTL
    • FrontControllerํŒจํ„ด Command ํŒจํ„ด
    • Forwarding
    • MVC
    • ํšŒ์›๊ฐ€์ž…์˜ˆ์ œ
    • ์ฐธ๊ณ 
      • ๊ฐœ๋ฐœํ™˜๊ฒฝ์„ค์ •
  • Java+
    • SOAP/WSDL vs REST
    • WSDL์„ JAVA๋กœ ๋ณ€ํ™˜ํ•˜๊ธฐ
    • SOAP ํ†ต์‹  OPEN API๋กœ ๊ฐœ๋ฐœํ•ด๋ณด๊ธฐ
  • Java
    • Basic
      • ๋ณ€์ˆ˜์™€ ํƒ€์ž…
      • ์—ฐ์‚ฐ์ž
      • ์กฐ๊ฑด๋ฌธ๊ณผ ๋ฐ˜๋ณต๋ฌธ
      • ์ฐธ์กฐ ํƒ€์ž…
      • ํด๋ž˜์Šค
      • ์ƒ์†(Inheritance)
      • ์ธํ„ฐํŽ˜์ด์Šค(Interface)
      • ์ค‘์ฒฉ ํด๋ž˜์Šค์™€ ์ค‘์ฒฉ ์ธํ„ฐํŽ˜์ด์Šค
      • ์˜ˆ์™ธ ์ฒ˜๋ฆฌ
      • API - Object, System, Class, Math, Wrapper
      • API - String, StringBuffer, StringBuilder
      • Thread
      • Generic
      • Lambda
      • Collection - List, Set
      • Collection - Map
      • Collection - Tree
      • Collection - Stack, Queue
      • Stream
      • Reflection
      • ์ •๊ทœํ‘œํ˜„์‹
      • GUI
      • UML
      • Serializable
    • Advanced
      • OutOfMemoryError
      • AutoValue
      • meta-annotation
        • @Retention
        • @Target
        • @Repeatable
    • Effective Java 3/E
      • ITEM 1: Static Factory Method(์ •์  ๋ฉ”์†Œ๋“œ)
      • ITEM 2: Builder Pattern
      • ITEM 3: Singleton
      • ITEM 4: Private Constructor
      • ITEM 5: Dependency Injection
      • ITEM 6: Avoid Unnecessary Object
      • ITEM 7: Eliminate Object Reference
      • ITEM 8: Avoid finalizer and cleaner
      • ITEM 9: try-with-resources
      • ITEM 10: The gerneral contract when overriding equlas
      • ITEM 11: Overriding hashCode
      • ITEM 12: overriding toString
      • ITEM 13: overriding clone judiciously
      • ITEM 14: Consider implementing comparable
      • ITEM 15: ํด๋ž˜์Šค์™€ ๋ฉค๋ฒ„์˜ ์ ‘๊ทผ์„ ์ตœ์†Œํ™”ํ•ด๋ผ
      • ITEM 16: Use Accessor methods
      • ITEM 17: ๋ณ€๊ฒฝ ๊ฐ€๋Šฅ์„ฑ์„ ์ตœ์†Œํ™”ํ•ด๋ผ(๋ถˆ๋ณ€ ํด๋ž˜์Šค)
      • ITEM 18: ์ƒ์†๋ณด๋‹จ ์ปดํฌ์ง€์…˜์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 19: ์ƒ์†์„ ๊ณ ๋ คํ•ด ์„ค๊ณ„ํ•˜๊ณ  ๋ฌธ์„œํ™”ํ•ด๋ผ
      • ITEM 20: ์ถ”์ƒ ํด๋ž˜์Šค๋ณด๋‹ค ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์šฐ์„ ํ•˜๋ผ
      • ITEM 21: ์ธํ„ฐํŽ˜์ด์Šค๋Š” ๊ตฌํ˜„ํ•˜๋Š” ์ชฝ์„ ์ƒ๊ฐํ•ด ์„ค๊ณ„ํ•ด๋ผ.
      • ITEM 22: ์ธํ„ฐํŽ˜์ด์Šค๋Š” ํƒ€์ž…์„ ์ •์˜ํ•˜๋Š” ์šฉ๋„๋กœ๋งŒ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 23: ํƒœ๊ทธ ๋‹ฌ๋ฆฐ ํด๋ž˜์Šค๋ณด๋‹ค ํด๋ž˜์Šค ๊ณ„์ธต๊ตฌ์กฐ๋ฅผ ํ™œ์šฉํ•ด๋ผ
      • ITEM 24: ๋ฉค๋ฒ„ ํด๋ž˜์Šค๋Š” ๋˜๋„๋ก static์œผ๋กœ ๊ตฌํ˜„ํ•ด๋ผ
      • ITEM 25: ํ†ฑ๋ ˆ๋ฒจ ํด๋ž˜์Šค๋Š” ํ•œ ํŒŒ์ผ์— ํ•˜๋‚˜๋งŒ ์ƒ์„ฑํ•ด๋ผ.
      • ITEM 26: Raw type์€ ์‚ฌ์šฉํ•˜์ง€ ๋งˆ๋ผ
      • ITEM 27: ๋น„๊ฒ€์‚ฌ ๊ฒฝ๊ณ ๋ฅผ ์ œ๊ฑฐํ•ด๋ผ
      • ITEM 28: ๋ฐฐ์—ด๋ณด๋‹ค๋Š” ๋ฆฌ์ŠคํŠธ๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 29: ์ด์™•์ด๋ฉด ์ œ๋„ค๋ฆญ ํƒ€์ž…์œผ๋กœ ๋งŒ๋“ค์–ด๋ผ
      • ITEM 30: ์ด์™•์ด๋ฉด ์ œ๋„ค๋ฆญ ๋ฉ”์„œ๋“œ๋กœ ๋งŒ๋“ค์–ด๋ผ
      • ITEM 31 : ํ•œ์ •์  ์™€์ผ๋“œ์นด๋“œ๋ฅผ ์‚ฌ์šฉํ•ด API ์œ ์—ฐ์„ฑ์„ ๋†’์—ฌ๋ผ
      • ITEM 32: ์ œ๋„ค๋ฆญ๊ณผ ๊ฐ€๋ณ€์ธ์ˆ˜๋ฅผ ํ•จ๊ป˜ ์“ธ ๋•Œ๋Š” ์‹ ์ค‘ํ•ด๋ผ
      • ITEM 33: ํƒ€์ž… ์•ˆ์ „ ์ด์ข… ์ปจํ…Œ์ด๋„ˆ๋ฅผ ๊ณ ๋ คํ•ด๋ผ
      • ITEM 34: int ์ƒ์ˆ˜ ๋Œ€์‹  ์—ด๊ฑฐ ํƒ€์ž…์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 35: ordinal ๋ฉ”์„œ๋“œ ๋Œ€์‹  ์ธ์Šคํ„ด์Šค ํ•„๋“œ๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 36: ๋น„ํŠธ ํ•„๋“œ ๋Œ€์‹  EnumSet์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 37: ordinal ์ธ๋ฑ์‹ฑ ๋Œ€์‹  EnumMap์„ ์‚ฌ์šฉํ•ด๋ผ
      • TEM 38 : ํ™•์žฅํ•  ์ˆ˜ ์žˆ๋Š” ์—ด๊ฑฐํƒ€์ž…์ด ํ•„์š”ํ•˜๋ฉด ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 39: ๋ช…๋ช… ํŒจํ„ด๋ณด๋‹ค ์• ๋„ˆํ…Œ์ด์…˜์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 40: @Override ์–ด๋…ธํ…Œ์ด์…˜์„ ์ผ๊ด€๋˜๊ฒŒ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 41: ์ •์˜ํ•˜๋ ค๋Š” ๊ฒƒ์ด ํƒ€์ž…์ด๋ผ๋ฉด ๋งˆ์ปค ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 42: ์ต๋ช… ํด๋ž˜์Šค๋ณด๋‹ค๋Š” ๋žŒ๋‹ค๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 43: ๋žŒ๋‹ค๋ณด๋‹ค๋Š” ๋ฉ”์„œ๋“œ ์ฐธ์กฐ๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 44: ํ‘œ์ค€ ํ•จ์ˆ˜ํ˜• ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 45: ์ŠคํŠธ๋ฆผ์€ ์ฃผ์˜ํ•ด์„œ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 46: ์ŠคํŠธ๋ฆผ์—์„œ ๋ถ€์ž‘์šฉ ์—†๋Š” ํ•จ์ˆ˜๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 47: ๋ฐ˜ํ™˜ ํƒ€์ž…์œผ๋กœ๋Š” ์ŠคํŠธ๋ฆผ๋ณด๋‹ค ์ปฌ๋ ‰์…˜์ด ๋‚ซ๋‹ค.
      • ITEM 48: ์ŠคํŠธ๋ฆผ ๋ณ‘๋ ฌํ™”๋Š” ์ฃผ์˜ํ•ด์„œ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 49: ๋งค๊ฐœ๋ณ€์ˆ˜๊ฐ€ ์œ ํšจํ•œ์ง€ ๊ฒ€์‚ฌํ•ด๋ผ
      • ITEM 50: ์ ์‹œ์— ๋ฐฉ์–ด์  ๋ณต์‚ฌ๋ณธ์„ ๋งŒ๋“ค์–ด๋ผ
      • ITEM 51: ๋ฉ”์„œ๋“œ ์‹œ๊ทธ๋‹ˆ์ฒ˜๋ฅผ ์‹ ์ค‘ํžˆ ์„ค๊ณ„ํ•ด๋ผ
      • ITEM 52: ๋‹ค์ค‘์ •์˜๋Š” ์‹ ์ค‘ํžˆ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 53: ๊ฐ€๋ณ€์ธ์ˆ˜๋Š” ์‹ ์ค‘ํžˆ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 54: null์ด ์•„๋‹Œ, ๋นˆ ์ปฌ๋ ‰์…˜์ด๋‚˜ ๋ฐฐ์—ด์„ ๋ฐ˜ํ™˜ํ•ด๋ผ
      • ITEM 55: Optional ๋ฐ˜ํ™˜์€ ์‹ ์ค‘ํ•˜๊ฒŒ ํ•ด๋ผ
      • ITEM 56: ๊ณต๊ฐœ๋œ API ์š”์†Œ์—๋Š” ํ•ญ์ƒ ์ฃผ์„์„ ์ž‘์„ฑํ•ด๋ผ
      • ITEM 57: ์ง€์—ญ๋ณ€์ˆ˜์˜ ๋ฒ”์œ„๋ฅผ ์ตœ์†Œํ™”ํ•ด๋ผ
      • ITEM 58: ์ „ํ†ต์ ์ธ for ๋ฌธ๋ณด๋‹ค๋Š” for-each๋ฌธ์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 59: ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ๋ฅผ ์ตํžˆ๊ณ  ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 60: ์ •ํ™•ํ•œ ๋‹ต์ด ํ•„์š”ํ•˜๋‹ค๋ฉด float์™€ double์€ ํ”ผํ•ด๋ผ
      • ITEM 61: ๋ฐ•์‹ฑ๋œ ๊ธฐ๋ณธ ํƒ€์ž…๋ณด๋‹ค๋Š” ๊ธฐ๋ณธ ํƒ€์ž…์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 62: ๋‹ค๋ฅธ ํƒ€์ž…์ด ์ ์ ˆํ•˜๋‹ค๋ฉด ๋ฌธ์ž์—ด ์‚ฌ์šฉ์„ ํ”ผํ•ด๋ผ
      • ITEM 63: ๋ฌธ์ž์—ด ์—ฐ๊ฒฐ์€ ๋А๋ฆฌ๋‹ˆ ์ฃผ์˜ํ•ด๋ผ
      • ITEM 64: ๊ฐ์ฒด๋Š” ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์‚ฌ์šฉํ•ด ์ฐธ์กฐํ•ด๋ผ
      • ITEM 65: ๋ฆฌํ”Œ๋ ‰์…˜๋ณด๋‹ค๋Š” ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 66: ๋„ค์ดํ‹ฐ๋ธŒ ๋ฉ”์„œ๋“œ๋Š” ์‹ ์ค‘ํžˆ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 67: ์ตœ์ ํ™”๋Š” ์‹ ์ค‘ํžˆ ํ•ด๋ผ
      • ITEM 68: ์ผ๋ฐ˜์ ์œผ๋กœ ํ†ต์šฉ๋˜๋Š” ๋ช…๋ช… ๊ทœ์น™์„ ๋”ฐ๋ผ๋ผ
    • ๊ฐ์ฒด์ง€ํ–ฅ ์„ค๊ณ„ ์›์น™(SOLID)
    • ๋””์ž์ธํŒจํ„ด
      • Strategy Pattern
      • Template Method Pattern
      • Factory Method Pattern
      • Singleton
      • Delegation
      • Proxy
      • Adapter Pattern
    • ์‹ค์Šต
      • ์ธํ„ฐํŽ˜์ด์Šค ์‹ค์Šต - Vehicle
      • ์ธํ„ฐํŽ˜์ด์Šค ์‹ค์Šต - Remote
      • GUI ์‹ค์Šต - Calculator
      • GUI ์‹ค์Šต - button
      • GUI ์‹ค์Šต - lotto
      • Thread ์‹ค์Šต - ์ขŒ์„์˜ˆ์•ฝ, ๋ฉ”์„ธ์ง€๋ณด๋‚ด๊ธฐ
    • Jar vs War
  • ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค
    • KEY
    • Index
    • Transaction
    • Trigger
    • Procedure / Function
    • Package
    • ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ๋ฐฐ์›€ํ„ฐ
      • ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์‹œ์Šคํ…œ
      • ๊ด€๊ณ„๋ฐ์ดํ„ฐ ๋ชจ๋ธ
      • ๊ด€๊ณ„๋Œ€์ˆ˜์™€ SQL
    • MySQL
      • Database๋ž€
      • MySQL ์‹œ์ž‘ํ•˜๊ธฐ
      • MySQL Database
      • MySQL Table
      • CRUD
      • ๊ด€๊ณ„ํ˜• ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค
      • Server์™€ Client
    • PostgreSQL
    • NoSQL
      • Install Cassandra on mac
      • Cassandra๋ž€?
      • NiFi๋ž€
  • Algorithm
    • String
    • Recursion
    • Dynamic Programming
    • Array, Struct, Pointer
    • Math
    • Sort
    • List
    • Stack
    • Queue
    • Graph
    • Tree
    • Maze
    • AVL
    • ์ด์ง„ํƒ์ƒ‰ํŠธ๋ฆฌ(Binary Search Tree)
    • DFS์™€ BFS
    • ๋‹ค์ต์ŠคํŠธ๋ผ ์•Œ๊ณ ๋ฆฌ์ฆ˜(Dijkstra's Algorithm)
    • Red-Black ํŠธ๋ฆฌ
    • A* ์•Œ๊ณ ๋ฆฌ์ฆ˜
    • Heap
    • Huffman Coding
    • Priority Queue
    • Bellman-Ford ์•Œ๊ณ ๋ฆฌ์ฆ˜
    • C++
      • Class
      • STL
        • STL pair
        • STL Container - Associate Container
        • STL Container - Sequence Container
        • STL Container - Container Adapter
  • JavaScript
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  • ์บ์‹œ(cache)๋ž€?
  • ์–ธ์ œ ์‚ฌ์šฉํ•˜๋ฉด ์ข‹์„๊นŒ?
  • ์›น์„œ๋ฒ„
  • ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์บ์‹ฑ
  • ์‘๋‹ต ์บ์‹ฑ
  • HTTP ํ—ค๋”๋ฅผ ํ†ตํ•œ ๋ธŒ๋ผ์šฐ์ € ์บ์‹ฑ
  • redis๋ž€?
  • Varnish ๋ž€?
  • VCL
  • purge
  • Spring Cache
  • ์‚ฌ์šฉ๋ฐฉ๋ฒ•
  • Cache Annotation
  • EHCache
  • EHCache๋ž€?
  • ์„ค์ • ๋ฐฉ๋ฒ•
  • ์ฐธ๊ณ 

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  1. Spring

Cache

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์บ์‹œ(cache)๋ž€?

ํ”„๋กœ๊ทธ๋žจ์ด ์ˆ˜ํ–‰๋  ๋•Œ ๋‚˜ํƒ€๋‚˜๋Š” ์ง€์—ญ์„ฑ์„ ์ด์šฉํ•ด ๋ฉ”๋ชจ๋ฆฌ๋‚˜ ๋””์Šคํฌ์—์„œ ์‚ฌ์šฉ๋˜์—ˆ๋˜ ๋‚ด์šฉ์„ ๋น ๋ฅด๊ฒŒ ์ ‘๊ทผํ•  ์ˆ˜ ์žˆ๋Š” ๊ณณ์— ๋ณด๊ด€ํ•˜๊ณ  ๊ด€๋ฆฌํ•จ์œผ๋กœ์จ ๋‘ ๋ฒˆ์งธ ์ ‘๊ทผ ๋ถ€ํ„ฐ๋Š” ๋ณด๋‹ค ๋น ๋ฅด๊ฒŒ ์ฐธ์กฐํ•˜๋„๋ก ํ•˜๋Š” ๊ฒƒ์ด๋‹ค.

ํ•˜๋“œ๋””์Šคํฌ๋Š” ์šฉ๋Ÿ‰์ด ์•„์ฃผ ํฌ์ง€๋งŒ ์†๋„๊ฐ€ ๋А๋ฆฌ๊ณ , ๋ฉ”์ธ ๋ฉ”๋ชจ๋ฆฌ(RAM)์˜ ์šฉ๋Ÿ‰์€ 1/100์ •๋„๋กœ ์ž‘์ง€๋งŒ ์†๋„๋Š” ์‹ญ๋งŒ๋ฐฐ ์ •๋„ ๋น ๋ฅด๋‹ค. ์บ์‹œ ๋ฉ”๋ชจ๋ฆฌ๋Š” ๋ฉ”์ธ ๋ฉ”๋ชจ๋ฆฌ(RAM)์˜ 1/100 ์ •๋„ ์šฉ๋Ÿ‰์ด์ง€๋งŒ ์†๋„๋Š” ํ›จ์”ฌ ๋น ๋ฅด๋‹ค.

์ฆ‰, ์‚ฌ์šฉ๋˜์—ˆ๋˜ ๋ฐ์ดํ„ฐ๋Š” ๋‹ค์‹œ ์‚ฌ์šฉ๋˜์–ด์งˆ ๊ฐ€๋Šฅ์„ฑ์ด ๋†’๋‹ค๋Š” ๊ฐœ๋… ์„ ์ด์šฉํ•˜์—ฌ, ๋‹ค์‹œ ์‚ฌ์šฉ๋  ํ™•๋ฅ ์ด ๋†’์€ ๊ฒƒ์€ ๋” ๋น ๋ฅด๊ฒŒ ์ ‘๊ทผ ๊ฐ€๋Šฅํ•œ ์ €์žฅ์†Œ๋ฅผ ์‚ฌ์šฉํ•œ๋‹ค๋Š” ๊ฐœ๋…์ด๋‹ค.

์–ธ์ œ ์‚ฌ์šฉํ•˜๋ฉด ์ข‹์„๊นŒ?

  1. ๋‹จ์ˆœํ•œ ๋ฐ์ดํ„ฐ(์ •๋ณด)

  2. ๋™์ผํ•œ ๋ฐ์ดํ„ฐ๋ฅผ ๋ฐ˜๋ณต์ ์œผ๋กœ ์ œ๊ณตํ•ด์•ผํ•˜๋Š” ๊ฒฝ์šฐ

  3. ๋ฐ์ดํ„ฐ์˜ ๋ณ€๊ฒฝ์ฃผ๊ธฐ๊ฐ€ ๋นˆ๋ฒˆํ•˜์ง€ ์•Š๊ณ , ๋‹จ์œ„ ์ฒ˜๋ฆฌ ์‹œ๊ฐ„์ด ์˜ค๋ž˜๊ฑธ๋ฆฌ๋Š” ๊ฒฝ์šฐ

  4. ๋ฐ์ดํ„ฐ์˜ ์ตœ์‹ ํ™”๊ฐ€ ๋ฐ˜๋“œ์‹œ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์ด๋ค„์ง€์ง€ ์•Š์•„๋„ ์„œ๋น„์Šค ํ’ˆ์งˆ์— ์˜ํ–ฅ์„ ๊ฑฐ์˜ ์ฃผ์ง€ ์•Š๋Š” ๋ฐ์ดํ„ฐ

์ด๋ ‡๊ฒŒ ์บ์‹œ๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด ์„œ๋ฒ„๊ฐ„ ๋ถˆํ•„์š”ํ•œ ํŠธ๋ž˜ํ”ฝ์„ ์ค„์ผ ์ˆ˜ ์žˆ์œผ๋ฉฐ, ๊ทธ๋กœ ์ธํ•ด ์›น ์–ดํ”Œ๋ฆฌ์ผ€์ด์…˜ ์„œ๋ฒ„์˜ ๋ถ€ํ•˜๊ฐ€ ๊ฐ์†Œ๋œ๋‹ค. ๋˜ํ•œ ์บ์‹œ์— ์ €์žฅ๋œ ๋ฐ์ดํ„ฐ๋ฅผ ๋น ๋ฅด๊ฒŒ ์ฝ์–ด์™€ ์–ดํ”Œ๋ฆฌ์ผ€์ด์…˜์„ ์‚ฌ์šฉํ•˜๋Š” ๊ณ ๊ฐ์—๊ฒŒ ์พŒ์ ํ•œ ์„œ๋น„์Šค ๊ฒฝํ—˜์„ ์ œ๊ณตํ•  ์ˆ˜ ์žˆ๋‹ค.

์›น์„œ๋ฒ„

์›น์— ์š”์ฒญ์„ ๋‚ ๋ฆฌ๋ฉด, ์š”์ฒญ์€ ์›น ๋ธŒ๋ผ์šฐ์ €๋กœ๋ถ€ํ„ฐ ํ•˜๋“œ ๋””์Šคํฌ์˜ ํŒŒ์ผ ์‹œ์Šคํ…œ์— ์žˆ๋Š” ์ •์  ๋ฆฌ์†Œ์Šค๋ฅผ ์ œ๊ณตํ•˜๋Š” ์›น ์„œ๋ฒ„๋กœ ์ „๋‹ฌ๋œ๋‹ค.

์ฒซ ๋ฒˆ์งธ ์š”์ฒญ์—์„œ๋Š” ํ•˜๋“œ ๋””์Šคํฌ๋Š” ์บ์‹œ๋ฅผ ํ™•์ธํ•˜์—ฌ ์บ์‹œ ๋ฏธ์Šค(cache miss)๋ฅผ ๋ฐœ์ƒ์‹œํ‚จ๋‹ค. ๊ทธ๋ฆฌ๊ณ  ํ•˜๋“œ ๋“œ๋ผ์ด๋ธŒ๋กœ๋ถ€ํ„ฐ ๋ฐ์ดํ„ฐ๋ฅผ ๊ฐ€์ ธ์™€ ์ถ”ํ›„์— ๋‹ค์‹œ ์š”์ฒญ ๋ฐ›์„ ์ˆ˜ ์žˆ์Œ์„ ๊ฐ€์ •ํ•˜๊ณ  ์บ์‹œ์— ์ €์žฅํ•œ๋‹ค.

์ดํ›„ ์š”์ฒญ๋ถ€ํ„ฐ๋Š” ์บ์‹œ ์กฐํšŒ์‹œ ์บ์‹œ ํžˆํŠธ(cache hit)๋ฅผ ๋ฐœ์ƒ์‹œํ‚จ๋‹ค. ์ด ๋ฐ์ดํ„ฐ๋Š” ์บ์‹œ ๋ฏธ์Šค๋ฅผ ์ผ์œผํ‚ค๊ธฐ ์ „๊นŒ์ง€ ๋ฒ„ํผ์—์„œ ์ œ๊ณต๋œ๋‹ค.

Cache Miss

CPU๊ฐ€ ์ฐธ์กฐํ•˜๊ณ ์ž ํ•˜๋Š” ๋ฉ”๋ชจ๋ฆฌ๊ฐ€ ์บ์‹œ์— ์กด์žฌํ•˜์ง€ ์•Š์„ ๋•Œ

Cache Hit

CPU๊ฐ€ ์ฐธ์กฐํ•˜๊ณ ์ž ํ•˜๋Š” ๋ฉ”๋ชจ๋ฆฌ๊ฐ€ ์บ์‹œ์— ์กด์žฌํ•  ๋•Œ

๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์บ์‹ฑ

๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์ฟผ๋ฆฌ๋Š” ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์„œ๋ฒ„์—์„œ ์ˆ˜ํ–‰๋˜๊ธฐ ๋•Œ๋ฌธ์— ์†๋„๊ฐ€ ๋А๋ ค์ง€๊ณ  ๋ถ€ํ•˜๊ฐ€ ๋ชฐ๋ฆด ์ˆ˜ ์žˆ๋‹ค. ๊ฒฐ๊ณผ๊ฐ’์„ ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค์— ์บ์‹ฑํ•จ์œผ๋กœ์จ ์‘๋‹ต ์‹œ๊ฐ„์„ ํ–ฅ์ƒ์‹œํ‚ฌ ์ˆ˜ ์žˆ๋‹ค. ๋Œ€๋‹ค์ˆ˜์˜ ๋จธ์‹ ์ด ๋™์ผํ•œ ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค์— ๋™์ผํ•œ ์ฟผ๋ฆฌ๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๊ฒฝ์šฐ์— ์œ ์šฉํ•˜๋‹ค. ๋Œ€๋‹ค์ˆ˜์˜ ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์„œ๋ฒ„๋Š” ์ตœ์ ํ™”๋œ ์บ์‹ฑ์„ ์œ„ํ•œ ๊ธฐ๋Šฅ์„ ๊ธฐ๋ณธ์ ์œผ๋กœ ์ง€์›ํ•˜๋ฉฐ, ์š”๊ตฌ์‚ฌํ•ญ์— ๋งž๊ฒŒ ์ˆ˜์ •ํ•  ์ˆ˜ ์žˆ๋Š” ํŒŒ๋ผ๋ฏธํ„ฐ๋“ค์ด ์กด์žฌํ•œ๋‹ค.

์‘๋‹ต ์บ์‹ฑ

์›น ์„œ๋ฒ„์˜ ์‘๋‹ต์€ ๋ฉ”๋ชจ๋ฆฌ์— ์บ์‹ฑ๋œ๋‹ค. ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์บ์‹œ๋Š” ๋กœ์ปฌ ์ธ๋ฉ”๋ชจ๋ฆฌ์— ์ €์žฅ๋˜๊ฑฐ๋‚˜ ์บ์‹œ ์„œ๋ฒ„ ์œ„์—์„œ ์‹คํ–‰๋˜๋Š” redis์™€ ๊ฐ™์€ ์ธ๋ฉ”๋ชจ๋ฆฌ ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค์— ์ €์žฅํ•  ์ˆ˜ ์žˆ๋‹ค.

HTTP ํ—ค๋”๋ฅผ ํ†ตํ•œ ๋ธŒ๋ผ์šฐ์ € ์บ์‹ฑ

๋ชจ๋“  ๋ธŒ๋ผ์šฐ์ €๋Š” HTML, JS, CSS, ์ด๋ฏธ์ง€์™€ ๊ฐ™์€ ํŒŒ์ผ๋“ค์„ ์ž„์‹œ ์ €์žฅ์„ ์œ„ํ•ด HTTP ์บ์‹œ(์›น ์บ์‹œ)์˜ ๊ตฌํ˜„์„ ์ œ๊ณตํ•˜๊ณ  ์žˆ๋‹ค. ์„œ๋ฒ„ ์‘๋‹ต์ด ์˜ฌ๋ฐ”๋ฅธ HTTP ํ—ค๋” ์ง€์‹œ์ž๋ฅผ ์ œ๊ณตํ•ด ๋ธŒ๋ผ์šฐ์ €๊ฐ€ ์‘๋‹ต์„ ์บ์‹ฑํ•  ์ˆ˜ ์žˆ๋Š” ์‹œ๊ธฐ์™€ ์ง€์† ๊ธฐ๊ฐ„์„ ์ง€์‹œํ•  ๋•Œ ์‚ฌ์šฉํ•œ๋‹ค.

  • ๋ฆฌ์†Œ์Šค๊ฐ€ ๋กœ์ปฌ ์บ์‹œ๋กœ๋ถ€ํ„ฐ ๋น ๋ฅด๊ฒŒ ๋กœ๋“œ๋˜๊ธฐ ๋•Œ๋ฌธ์— ์‚ฌ์šฉ์ž ๊ฒฝํ—˜์ด ํ–ฅ์ƒ๋œ๋‹ค.

  • ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์„œ๋ฒ„ ๋ฐ ํŒŒ์ดํ”„๋ผ์ธ์˜ ๋‹ค๋ฅธ ๊ตฌ์„ฑ์š”์†Œ์— ๋Œ€ํ•œ ๋ถ€ํ•˜๊ฐ€ ์ค„์–ด๋“ ๋‹ค.

  • ๋ถˆํ•„์š”ํ•œ ๋Œ€์—ญํญ์— ๋Œ€ํ•œ ์ง€๋ถˆ๋น„์šฉ์ด ์ค„์–ด๋“ ๋‹ค.

redis๋ž€?

REmote DIctionary Server์˜ ์•ฝ์ž๋กœ ๋Œ€์šฉ๋Ÿ‰ ์ฒ˜๋ฆฌ ๊ด€๋ จ ๊ธฐ์ˆ ์ด๋‹ค.

  • ๋ฉ”๋ชจ๋ฆฌ ์œ„์—์„œ ๋™์ž‘ํ•˜๋Š” Key/value ์ €์žฅ์†Œ(Store)์ธ Redis๋Š” NoSQL DBMS๋กœ ๋ถ„๋ฅ˜๋˜๋ฉฐ ๋™์‹œ์— Memcached์™€ ๊ฐ™์€ ์ธ๋ฉ”๋ชจ๋ฆฌ(In-memory) ์†”๋ฃจ์…˜์œผ๋กœ ๋ถ„๋ฆฌ๋œ๋‹ค.

  • ๋ช…์‹œ์ ์œผ๋กœ ์‚ญ์ œ, expire๋ฅผ ์„ค์ •ํ•˜์ง€ ์•Š์œผ๋ฉด ๋ฐ์ดํ„ฐ๋Š” ์‚ญ์ œ๋˜์ง€ ์•Š๋Š”๋‹ค.(์˜๊ตฌ ๋ณด์กด)

  • ์—ฌ๋Ÿฌ๋Œ€์˜ ์„œ๋ฒ„ ๊ตฌ์„ฑ์ด ๊ฐ€๋Šฅํ•˜๋‹ค.

์ธ๋ฉ”๋ชจ๋ฆฌ ์บ์‹œ(In-memory Cache)๋ž€?

์ธ ๋ฉ”๋ชจ๋ฆฌ ์บ์‹œ๋Š” ๋ชจ๋“  ๋ฐ์ดํ„ฐ๋ฅผ ๋ฉ”๋ชจ๋ฆฌ(RAM)์—๋งŒ ์˜ฌ๋ ค๋†“๊ณ  ์‚ฌ์šฉํ•˜๋Š” ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค์˜ ์ผ์ข…์ด๋‹ค. ์ผ๋ฐ˜์ ์ธ ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค(RDBMS)๋Š” ๋””์Šคํฌ(HDD, SSD)์— ๋ฐ์ดํ„ฐ๋ฅผ ์˜๊ตฌ์ ์œผ๋กœ ์ €์žฅํ•ด๋†“๊ณ , ํ•„์š”ํ•œ ๋ฐ์ดํ„ฐ๋งŒ ๋ฉ”๋ชจ๋ฆฌ์— ์ฝ์–ด์„œ ์‚ฌ์šฉํ•œ๋‹ค.

๋””์Šคํฌ์— ์ ‘๊ทผํ•˜์ง€ ์•Š๊ณ  ๋ฉ”๋ชจ๋ฆฌ๋กœ๋งŒ ๋ชจ๋“  ์ฒ˜๋ฆฌ๋ฅผ ํ•˜๊ธฐ ๋•Œ๋ฌธ์— ๋ฐ์ดํ„ฐ ์ €์žฅ ๋ฐ ๊ฒ€์ƒ‰ ์†๋„๊ฐ€ ๋งค์šฐ ๋น ๋ฅด์ง€๋งŒ ๋ฐ์ดํ„ฐ๋Š” ๋”ฑ ๋ฉ”๋ชจ๋ฆฌ ํฌ๊ธฐ(์šด์˜์ฒด์ œ ์‚ฌ์šฉ๋Ÿ‰ ์ œ์™ธ)๊นŒ์ง€๋งŒ ์ €์žฅํ•  ์ˆ˜ ์žˆ๋‹ค.

Varnish ๋ž€?

Varnish๋Š” BSD ๋ผ์ด์„ ์Šค๋ฅผ ๋”ฐ๋ฅด๋Š” ์˜คํ”ˆ ์†Œ์Šค ์›น ์บ์‹œ ์†Œํ”„ํŠธ์›จ์–ด์ด๋‹ค.

์ฃผ๋กœ nginx ์•ž๋‹จ์—์„œ url ๊ธฐ๋ฐ˜์œผ๋กœ ๋™์ผํ•œ url์ด ๋“ค์–ด์˜ค๋ฉด ์‘๋‹ต๊ฐ’์„ ๊ทธ๋Œ€๋กœ ๋ณด๋‚ด์ค„๋•Œ ์‚ฌ์šฉํ•œ๋‹ค.

VCL

Varnish๋Š” ์„ค์ •์„ ์œ„ํ•ด VCL์ด๋ผ๋Š” ๋ณ„๋„์˜ DSL(Domain-Specific Language)์„ ์ œ๊ณตํ•œ๋‹ค. ์‚ฌ์šฉ์ž๋Š” VCL์„ ์‚ฌ์šฉํ•˜์—ฌ ์„ค์ • ํŒŒ์ผ์„ ์ž‘์„ฑํ•œ๋‹ค. VCL๋กœ ์ž‘์„ฑ๋œ ์„ค์ • ํŒŒ์ผ์˜ ๋‚ด์šฉ์€ C ํ”„๋กœ๊ทธ๋žจ์œผ๋กœ ๋ณ€ํ™˜๋˜์—ˆ๋‹ค๊ฐ€ ๊ณต์œ  ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ๋กœ ์ปดํŒŒ์ผ๋œ๋‹ค. Varnish๋Š” ์‹œ์ž‘ํ•  ๋•Œ๋‚˜ ์‹คํ–‰ ์ค‘์ผ ๋•Œ ์ด ๊ณต์œ  ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ ํŒŒ์ผ์„ ๋กœ๋“œํ•˜์—ฌ ์‚ฌ์šฉํ•œ๋‹ค. ๋™์‹œ์— ์—ฌ๋Ÿฌ ๊ฐœ์˜ ์„ค์ •์„ ๋กœ๋“œํ•œ ํ›„์— Varnish ์‹คํ–‰ ์ค‘์— ์„ค์ •์„ ๋ณ€๊ฒฝํ•  ์ˆ˜ ์žˆ๋‹ค.

๋‹ค์Œ ๊ทธ๋ฆผ์€ Varnish๊ฐ€ ์›น ์š”์ฒญ์„ ์ฒ˜๋ฆฌํ•˜๋Š” ๊ณผ์ •์„ ๊ฐ„๋žตํ•˜๊ฒŒ ๋‚˜ํƒ€๋‚ธ ๊ฒƒ์ด๋‹ค.

purge

purge๋Š” ์บ์‹ฑ๋˜์–ด ์žˆ๋Š” ๋ฐ์ดํ„ฐ๋ฅผ TTL(Time - To - Live)์ด ์ง€๋‚˜๊ฐ€๊ธฐ์ „์— ๊ฐ•์ œ๋กœ ์‚ญ์ œํ•˜๋Š” ๊ธฐ๋Šฅ์ด๋‹ค. ๋‹ค์Œ๊ณผ ๊ฐ™์€ ๋‘๊ฐ€์ง€ ํ˜•ํƒœ๋กœ purge ๊ธฐ๋Šฅ์„ ์ œ๊ณตํ•ด์ฃผ๊ณ  ์žˆ๋‹ค.

  1. ํŠน์ • url์„ ์ง€์ •ํ•˜์—ฌ ํ•ด๋‹น ๋ฐ์ดํ„ฐ ์‚ญ์ œ

  2. ์ •๊ทœํ‘œํ˜„์‹์„ ์‚ฌ์šฉํ•ด ํ•ด๋‹น ํŒจํ„ด์˜ ๋ฐ์ดํ„ฐ๊ฐ€ ์‚ฌ์šฉ๋˜์ง€ ์•Š๋„๋ก ํ•˜๋Š” ๋ฐฉ๋ฒ•

    • ์‹ค์ œ๋กœ ๋ฐ์ดํ„ฐ๋ฅผ ์‚ญ์ œํ•˜์ง€๋Š” ์•Š๊ธฐ ๋•Œ๋ฌธ์— ban ์ด๋ผ๊ณ  ํ•œ๋‹ค.

๋‘ ๋ฒˆ์งธ๋Š” ์‹ค์ œ๋กœ ๋ฐ์ดํ„ฐ๋ฅผ ์‚ญ์ œํ•˜์ง€๋Š” ์•Š๊ธฐ ๋•Œ๋ฌธ์— ban์ด๋ผ๊ณ  ํ•œ๋‹ค. ์บ์‹œ์—์„œ ๋ฐ์ดํ„ฐ๋ฅผ ๊ฒ€์ƒ‰ํ•  ๋•Œ ban์œผ๋กœ ์ง€์ •๋œ ์ •๊ทœ ํ‘œํ˜„์‹์— ํ•ด๋‹นํ•˜๋Š”์ง€ ๊ฒ€์‚ฌํ•œ๋‹ค. ์ •๊ทœ ํ‘œํ˜„์‹์„ ์ถ”๊ฐ€ํ•  ๋•Œ์—๋Š” ๋ฐ์ดํ„ฐ๊ฐ€ ์ •๊ทœ ํ‘œํ˜„์‹์— ์ผ์น˜ํ•˜๋Š”์ง€ ๊ฒ€์‚ฌํ•˜์ง€ ์•Š๋Š”๋‹ค. ๋ฐ์ดํ„ฐ๋ฅผ ๊ฒ€์ƒ‰ํ•  ๋•Œ ์ƒˆ๋กœ์ด ์ถ”๊ฐ€๋œ ban ์กฐ๊ฑด์„ ๊ฒ€์‚ฌํ•˜์—ฌ, ์กฐ๊ฑด์„ ๋งŒ์กฑ์‹œํ‚ค๋ฉด ์ €์žฅ๋œ ๋ฐ์ดํ„ฐ๋ฅผ ์‚ฌ์šฉํ•˜์ง€ ์•Š๋Š”๋‹ค.

ban req.http.host == "www.naver.com" && req.url ~ "\\.jpg$"

๋‹ค์Œ๊ณผ ๊ฐ™์ด ban์„ ์ง€์ •ํ•  ์ˆ˜ ์žˆ๊ณ , ํ•ด๋‹น ํŒจํ„ด์— ํฌํ•จ๋˜๋Š” ๋ฐ์ดํ„ฐ๋Š” ์บ์‹ฑ๋˜์ง€ ์•Š๋Š”๋‹ค.

์˜ˆ๋ฅผ ๋“ค์–ด ์‡ผํ•‘๋ชฐ ์ƒํ’ˆ์ƒ์„ธ ํŽ˜์ด์ง€๋Š” ๋ณ€๊ฒฝ์ด ์ ์œผ๋‹ˆ url ๊ธฐ๋ฐ˜์œผ๋กœ varnish cache๋ฅผ ํƒœ์›Œ ์„œ๋ฒ„๊นŒ์ง€ ์•ˆ๋ณด๋‚ด๊ณ , redis๋Š” ์„œ๋น„์Šค ์š”์ฒญ์ด ๋Š˜์–ด๋‚˜๋Š” ๊ฒฝ์šฐ DB ๋ถ€ํ•˜๊ฐ€ ๊ฐ€์ค‘๋˜๋Š” API์— ๊ฑธ์–ด์„œ ๋ฉ”๋ชจ๋ฆฌ์— ์‹ค์‹œ๊ฐ„์œผ๋กœ ์ €์žฅ์‹œํ‚ค๋Š” ๊ฒƒ์ด๋‹ค.

Spring Cache

Spring Caching Abstraction๋Š” ๋‹ค๋ฅธ ์บ์‹œ ์†”๋ฃจ์…˜์„ Spring CacheManager๋ฅผ ํ†ตํ•ด์„œ ์‰ฝ๊ฒŒ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋„๋ก ํ•ด์ค€๋‹ค. Spring Caching Abstraction๋Š” ์ž๋ฐ” ๋ฉ”์†Œ๋“œ์— ์บ์‹ฑ์„ ์ ์šฉํ•˜๋ฉฐ, ๋ฉ”์†Œ๋“œ๊ฐ€ ์‹คํ–‰๋  ๋•Œ ๋„˜์–ด์˜จ ํŒŒ๋ผ๋ฏธํ„ฐ ๊ฐ’์— ๋”ฐ๋ผ์„œ ์บ์‹œ๋ฅผ ์ ์šฉํ•œ๋‹ค.

์‚ฌ์šฉ๋ฐฉ๋ฒ•

  • pom.xml

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-cache</artifactId>
</dependency>

pom.xml์— ๋‹ค์Œ๊ณผ ๊ฐ™์ด ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ๋ฅผ ์ถ”๊ฐ€ํ•œ ํ›„ @EnableCaching ์–ด๋…ธํ…Œ์ด์…˜์„ ์„ ์–ธํ•˜๊ฒŒ ๋˜๋ฉด Spring Container์— ๋นˆ์ด ๋“ฑ๋ก๋œ๋‹ค. ๊ธฐ๋ณธ์ ์œผ๋กœ๋Š” ConcurrentMapCacheManager ๊ฐ€ ๋“ฑ๋ก๋˜๋ฉฐ, ์ƒํ™ฉ์— ๋งž๊ฒŒ ๋‹ค๋ฅธ ์บ์‹œ ๊ตฌํ˜„์ฒด๋ฅผ ๋“ฑ๋กํ•  ์ˆ˜ ์žˆ๋‹ค.

๋งŒ์•ฝ EHCache, Redis ๋“ฑ ์„œ๋“œํŒŒํ‹ฐ ๋ชจ๋“ˆ์„ ์ถ”๊ฐ€ํ•˜๊ฒŒ ๋˜๋ฉด, EHCacheManager, RedisCacheManager ๋ฅผ Bean์œผ๋กœ ๋“ฑ๋กํ•ด ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋‹ค.

์ ์šฉํ•˜๊ณ  ์‹ถ์€ ๋ฉ”์†Œ๋“œ์— @Cacheable ์–ด๋…ธํ…Œ์ด์…˜์„ ๋ถ™์ด๋ฉด ์ ์šฉ๋œ๋‹ค.

Cache Annotation

์–ด๋…ธํ…Œ์ด์…˜

์„ค๋ช…

@Cacheable

๋ฉ”์†Œ๋“œ์— ์บ์‹œ ํŠธ๋ฆฌ๊ฑฐ ์„ค์ •

@CachePut

๋ฉ”์†Œ๋“œ ์‹คํ–‰๊ณผ ๋ฐฉํ•ด์—†์ด ์บ์‹œ ๊ฐฑ์‹ 

@CacheEvict

์บ์‹œ๋˜์–ด์žˆ๋Š” ๋ฐ์ดํ„ฐ ์ง€์šฐ๊ธฐ

@CacheConfig

์บ์‹œ ๊ด€๋ จ ์„ค์ •

@EnableCaching

์Šคํ”„๋ง ์บ์‹œํ™œ์„ฑํ™”

Annotation ์†์„ฑ

์–ด๋…ธํ…Œ์ด์…˜

์„ค๋ช…

value

์บ์‹œ์˜ ์ด๋ฆ„

key

์บ์‹œํ•  ํ‚ค๋ฅผ ์„ค์ •(๊ธฐ๋ณธ์„ค์ •ํ•˜์ง€ ์•Š์œผ๋ฉด ํŒŒ๋ผ๋ฏธํ„ฐ๋กœ ์„ค์ •๋จ)

condition

ํŠน์ • ์กฐ๊ฑด์— ๋”ฐ๋ผ ์บ์‹œ๋ฅผ ํ• ์ง€ ์•Š์„์ง€ ๊ฒฐ์ •

cacheManager

ํ•ด๋‹น ์บ์‹œ ๋งค๋‹ˆ์ € ์„ค์ •๊ฐ€๋Šฅ

EHCache

EHCache๋ž€?

  • EHCache๋Š” ์˜คํ”ˆ ์†Œ์Šค ๊ธฐ๋ฐ˜์˜ Local Cache

  • ์†๋„๊ฐ€ ๋น ๋ฅด๋ฉฐ, ๊ฒฝ๋Ÿ‰ Cache ์ด๋‹ค.

  • Disk, Memory ์ €์žฅ์ด ๊ฐ€๋Šฅ

  • ์„œ๋ฒ„ ๊ฐ„ ๋ถ„์‚ฐ ์บ์‹œ๋ฅผ ์ง€์›

  • JSR107 JCache ํ‘œ์ค€์„ ์ง€์›ํ•œ๋‹ค. JCache์—์„œ ์ œ๊ณตํ•˜๋Š” Annotation์„ ํ†ตํ•ด ์ด๋ฏธ ์ž‘์„ฑ๋œ ์ฝ”๋“œ์— ๊ฐ„๋‹จํ•˜๊ฒŒ ๊ธฐ๋Šฅ์„ ์ถ”๊ฐ€ํ•  ์ˆ˜ ์žˆ๋‹ค.

  • JSR(Java Specification Requests) : ์‚ฌ์–‘ ๋ฐ ๊ธฐ์ˆ ์  ๋ณ€๊ฒฝ์— ๋Œ€ํ•œ ์ •์‹ ์ œ์•ˆ ๋ฌธ์„œ. ๊ฐœ์ธ ๋ฐ ์กฐ์ง์€ JCP (Java Community Process)์˜ ํšŒ์›์ด ๋  ์ˆ˜ ์žˆ์œผ๋ฉฐ JSR์— ์–ธ๊ธ‰ ๋œ ์ŠคํŽ™์— ๋”ฐ๋ผ ์ฝ”๋“œ๋ฅผ ๊ฐœ๋ฐœํ•  ์ˆ˜ ์žˆ๋‹ค. ๊ฐœ๋ฐœ ๋œ ๊ธฐ์ˆ ์  ๋ณ€ํ™”๋Š” JCP ํšŒ์›๋“ค์˜ ๊ฒ€ํ† ๋ฅผ ๊ฑฐ์ณ ์Šน์ธ๋œ๋‹ค.

  • JSR-107(JCACHE โ€“ Java Temporary Caching API) : ๊ฐ์ฒด ์ƒ์„ฑ, ๊ณต์œ  ์•ก์„ธ์Šค, ์Šคํ’€๋ง, ๋ฌดํšจํ™” ๋ฐ JVM ์ „๋ฐ˜์— ๊ฑธ์นœ ์ผ๊ด€์„ฑ์„ ํฌํ•จํ•˜์—ฌ Java ๊ฐ์ฒด์˜ ๋ฉ”๋ชจ๋ฆฌ ์บ์‹ฑ์—์„œ ์‚ฌ์šฉํ•  API ์— ๋Œ€ํ•œ ๊ธฐ์ค€์œผ๋กœ ๋ณผ ์ˆ˜ ์žˆ๋‹ค. ํ•ด๋‹น Spec ์œผ๋กœ ๊ตฌํ˜„๋œ cache๋กœ๋Š” EhCache๊ฐ€ ์œ ๋ช…ํ•˜๋ฉฐ, Hazelcast, Infinispan, Couchbase, Redis, Caffeine ๋“ฑ๋„ ํ•ด๋‹น ๊ธฐ์ค€์„ ๋”ฐ๋ฅด๋Š” ๊ฒƒ์œผ๋กœ ์•Œ๋ ค์ ธ ์žˆ๋‹ค.

์„ค์ • ๋ฐฉ๋ฒ•

  • pom.xml

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-cache</artifactId>
</dependency>

<!-- ehcache -->
<dependency>
  <groupId>org.ehcache</groupId>
  <artifactId>ehcache</artifactId>
</dependency>        

<!-- JS107 -->
<dependency>
  <groupId>javax.cache</groupId>
  <artifactId>cache-api</artifactId>
</dependency>

EHCache๋ฅผ ์ ์šฉํ•˜๊ณ  ์‹ถ์€ ๊ฒฝ์šฐ์—๋Š” pom.xml ์— ๋‹ค์Œ๊ณผ ๊ฐ™์ด ์„œ๋“œํŒŒํ‹ฐ ๋ชจ๋“ˆ์„ ์ถ”๊ฐ€ํ•˜๋ฉด๋œ๋‹ค.

  • @EnableCaching

import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Configuration;

// Configuration : IoC container(application context)๋ฅผ ์ ์šฉํ•˜๊ธฐ ์œ„ํ•ด ์‚ฌ์šฉํ•˜๋Š” ๋ฉ”ํƒ€์ •๋ณด
// EnableCaching์„ ํ†ตํ•ด ์Šคํ”„๋ง ์บ์‹œ๋ฅผ ํ™œ์„ฑํ™” ์‹œ์ผœ์ค€๋‹ค.
@Configuration
@EnableCaching
public class CacheConfig {

}

Spring์˜ auto-configuration์€ EHCache์˜ JSR-107์„ ์ฐพ์ง€๋งŒ ๊ธฐ๋ณธ(default)๋กœ๋Š” ์ƒ์„ฑ๋˜์ง€ ์•Š๋Š”๋‹ค. ์™œ๋ƒํ•˜๋ฉด ehcache.xml ์„ ์ฐพ์ง€ ๋ชปํ–ˆ๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค. ๊ทธ๋Ÿฌ๋ฏ€๋กœ, ehcache๋ฅผ ์‚ฌ์šฉํ•˜๊ธฐ ์œ„ํ•ด์„œ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์€ ์„ค์ •์„ ํ•ด์ค˜์•ผํ•œ๋‹ค.

  • application.yml : ์Šคํ”„๋ง์ด ๊ตฌ๋™๋  ๋•Œ ์ž๋™์œผ๋กœ ๋กœ๋”ฉํ•˜๋Š” ํ”„๋กœํผํ‹ฐํŒŒ์ผ(application.properties๋กœ๋„ ์‚ฌ์šฉ ๊ฐ€๋Šฅ) ์Šคํ”„๋ง์˜ ๊ทœ์•ฝ๊ณผ ๊ฐ™์Œ.

spring:
  cache:
    jcache:
      config: classpath:ehcache.xml     # JSR-107(jcache) config ์„ค์ •
  • ehcache.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.ehcache.org/v3"
    xmlns:jsr107="http://www.ehcache.org/v3/jsr107">

     <service>
        <jsr107:defaults enable-statistics="true"/>
    </service>
    <!-- testCache ์„ค์ • expiry none์œผ๋กœ ์„ค์ •ํ•ด ์บ์‹œ ์‚ญ์ œ์ „๊นŒ์ง€ ์œ ์ง€ -->
    <cache alias="paymentMasterCache">

        <key-type copier="org.ehcache.impl.copy.SerializingCopier">java.lang.String</key-type>
        <value-type copier="org.ehcache.impl.copy.SerializingCopier">java.util.ArrayList</value-type>
        <expiry>
            <none/>
        </expiry>
        <resources>
            <heap unit="entries">100</heap>
        </resources>
    </cache>

 </config>

๊ทธ๋Ÿฌ๋ฉด ํ™˜๊ฒฝ ์„ค์ •์€ ์™„๋ฃŒ๋˜์—ˆ๋‹ค.

import java.util.List;

import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

import com.example.cacheExample.entity.PaymentMaster;

/**
 * PaymentMasterRepository
 * JPA CrudRepository ์ƒ์†
 * 
 * ๋ณ€๊ฒฝ์ด ์ž์ฃผ์•ˆ๋˜๋Š” ๋ฐ์ดํ„ฐ๋กœ ์ตœ์ดˆ ํ•œ๋ฒˆ ๊ฐ€์ ธ์˜จ ํ›„ paymentMasterCache๋กœ Ehcache์— ์ €์žฅํ•ด๋‘”๋‹ค.
 * ์ด๋•Œ ๋งŒ๋ฃŒ๊ธฐํ•œ(expiry)๋Š” ์—†์Œ(์‚ญ์ œ์‹œ๊นŒ์ง€ ์œ ์ง€)
 *  
 * ์ˆ˜์ •/์ถ”๊ฐ€/์‚ญ์ œ๊ฐ€ ์ผ์–ด๋‚˜๋Š” ๊ฒฝ์šฐ์—๋Š” CacheEvict์œผ๋กœ paymentMasterCache๋ฅผ ์‚ญ์ œ
 * 
 * Ehcache ์„ค์ •์ •๋ณด๋Š” ehcache.xml์—์„œ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค.
 *
 */

@Repository
public interface PaymentMasterRepository extends CrudRepository<PaymentMaster,String>{

    @Cacheable(value="paymentMasterCache", key="#root.methodName")
    List<PaymentMaster> findAll();

    @CacheEvict(value="paymentMasterCache", allEntries=true)
    <S extends PaymentMaster> S save(S entity);

    @CacheEvict(value="paymentMasterCache", allEntries=true)    
    void deleteById(String pmtCode);

    @CacheEvict(value="paymentMasterCache", allEntries=true)
    void deleteAll();
}

์—ฌ๊ธฐ์„œ @CacheEvict์˜ allEntries=true๋Š” paymentMasterCache๋กœ ๋“ฑ๋ก๋œ ๋ชจ๋“  ์บ์‹œ๋ฅผ ์‚ญ์ œํ•œ๋‹ค๋Š” ์˜๋ฏธ์ด๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด findAll, findAll2 ๋‘๊ฐœ์˜ ํ‚ค๋กœ paymentMasterCache๊ฐ€ ์ƒ์„ฑ๋œ ๊ฒฝ์šฐ์— allEntries๋ฅผ ์‚ฌ์šฉํ•ด ์‚ญ์ œํ•˜๋Š” ๊ฒฝ์šฐ ๋‘ ๊ฐœ์˜ ์บ์‹œ๊ฐ€ ๋ชจ๋‘ ์‚ญ์ œ๋œ๋‹ค.

์ฐธ๊ณ 

https://goodgid.github.io/Redis/
๊ณต์‹๋ฌธ์„œ
Naver D2 -Varnish ์ด์•ผ๊ธฐ
https://groups.google.com/forum/#!topic/ksug/Z1bhFNJcw9Q
https://www.baeldung.com/spring-boot-ehcache
https://www.eurovps.com/blog/wp-content/uploads/2012/10/varnish-diagram.jpg
https://www.varnish-software.com/static/book/VCL_Basics.html