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전체보기 (101)Spring(29)Java(18)JPA(16)Hibernate(16)Database(14)Spring boot(14)mysql(11)JUnit5(9)Mockito(9)spring cloud(8)msa(8)μ•Œκ³ λ¦¬μ¦˜(8)coding test(7)boj(7)python(7)baekjoon(7)algorithm(7)design patterns(6)BFS(6)Microservices(5)Graph(5)DFS(5)eureka(4)spring-data-jpa(3)REST(3)blockchain(3)chatting(2)OOP(2)git(2)docker(2)native query(2)like(2)persistence context(2)creational(2)transaction(2)JPQL(2)String(2)unit test(2)mock(2)eager fetch(2)creational design patterns(2)νƒμš•μ•Œκ³ λ¦¬μ¦˜(2)entity manager(2)JWT(2)websocket(2)dirty read(1)INSERT(1)Restful(1)merge(1)http(1)λ³΅ν˜Έν™”(1)query method(1)Thread(1)stack(1)queue(1)phantom read(1)heap(1)interface segregation principle(1)합병정렬(1)mockMvc(1)λŒ€μΉ­ν‚€(1)nqueen(1)lazy fetch(1)μ–‘λ°©ν–₯(1)security(1)ifnull(1)datatype(1)feign(1)many to many(1)sleuth(1)service discovery(1)dijkstra(1)λ‹€μ΅μŠ€νŠΈλΌ(1)verify(1)isolation level(1)bidirectional(1)MVC(1)first level cache(1)rebase merge(1)many to one(1)csrf(1)StringBuilder(1)entity graph(1)one to many(1)message broker(1)single table(1)H2(1)연관관계(1)argument matchers(1)annotation(1)spy(1)SOLID(1)network(1)linkedlist(1)&&(1)뢄할정볡(1)@MockBean(1)μ΅œμ†Œμ‹ μž₯트리(1)Rollback(1)ALTER(1)DROP(1)CREATE(1)config server(1)inheritance(1)basic authentication(1)DBMS(1)https(1)REST API(1)json(1)크루슀칼(1)simple factory(1)μž¬κ·€μš©λ²•(1)hash function(1)decrypt(1)ν•™μ—…κ³„νš(1)one to one(1)hystrix(1)@modifying(1)p2p network(1)aop(1)μ•Œκ³ λ¦¬μ¦˜ λ³΅μž‘λ„(1)delete(1)joined(1)data type(1)Load balancing(1)tree(1)select(1)squash merge(1)2020(1)HashTable(1)RestTemplate(1)rdb(1)StringBuffer(1)nullif(1)synchronous(1)permissioned(1)join fetch(1)persistence(1)LIS(1)update(1)cloud config server(1)퀡정렬(1)JVM(1)API Gateway(1)single responsibility principle(1)zipkin(1)데이터 νƒ€μž…(1)streaming system(1)encrypt(1)λ°±νŠΈλž˜ν‚Ή(1)consensus(1)kafka(1)μ•”ν˜Έν™”(1)μ‚½μž…μ •λ ¬(1)array(1)n + 1(1)messaging(1)aws(1)Dependency Inversion Principle(1)이진탐색(1)spring security(1)ν”„λ¦Ό(1)spring cloud bus(1)λ³€μˆ˜(1)Builder(1)κ·Έλž˜ν”„(1)Token(1)regexp(1)zuul(1)ehcache(1)단방ν–₯(1)if(1)ACID(1)λ™μ κ³„νšλ²•(1)open closed principle(1)@SpringBootTest(1)entity relationships(1)equals(1)Singleton(1)rabbitmq(1)Factory Method(1)data structure(1)private(1)case(1)permissionless(1)unidirectional(1)named query(1)second level cache(1)non-repeatable read(1)structural(1)liskov substitution principle(1)Relational Database(1)fp(1)stomp(1)asynchronous(1)λΉ„λŒ€μΉ­ν‚€(1)μˆœμ°¨νƒμƒ‰(1)microservice(1)variable(1)table per class(1)transactional(1)선택정렬(1)sql(1)relationships(1)버블정렬(1)integration test(1)ec2 instance(1)behavioral(1)mapped super class(1)ORM(1)public(1)
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[Kafka] Introducing Apache Kafka

Producers and Consumers subscribe to a stream of recordsProducer -> Streaming Platform -> ConsumerThe producer and consumer here are independent of ea

2020λ…„ 9μ›” 26일
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[Design Patterns] Creational Design Patterns - Singleton

πŸš€ Singleton A singleton class has only one instance, accessible globally through a single point(via a method/field) The main problem this pattern so

2020λ…„ 9μ›” 20일
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[Design Patterns] Creational Design Patterns - Factory Method

We want to move the object creation logic from our code to a separate class.We use this pattern when we do not know in advance which class we may need

2020λ…„ 9μ›” 19일
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[Design Patterns] Creational Design Patterns - Simple Factory

Simpley move the instantiation logic to a separate class and most commonly to a static method of this class.Some do not consider simple factory to be

2020λ…„ 9μ›” 18일
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[Design Patterns] Creational Design Patterns - Builder

We have a complex process to construct an object involving multiple steps, then builder design pattern can help us.In Builder we remove the logic rela

2020λ…„ 9μ›” 16일
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[Design Patterns] Creational, Structural, and Behavioral Patterns

Creational Patterns deal with process of creation of objects of classes.Structural Patterns deal with how classes and objects are arranged or composed

2020λ…„ 9μ›” 15일
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[Design Patterns] SOLID Principles

Definition: There should never be more than one reason for a class to changefocuses on a single functionalityaddresses a specific concernExampleProtoc

2020λ…„ 9μ›” 13일
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[JPA & Hibernate] JPA Hidden Traps

1️⃣ @Transactional λ‚­λΉ„ μ•„λž˜μ˜ λ©”μ†Œλ“œλ₯Ό λ³΄μ‹œλ©΄ λͺ¨λ“  것이 μ œλŒ€λ‘œ 흘러 κ°€λŠ” 것을 λ³Ό μˆ˜κ°€ μžˆμŠ΅λ‹ˆλ‹€. λ°μ΄ν„°λ² μ΄μŠ€λ‘œλΆ€ν„° μ—”ν‹°ν‹°κ°€ λ°˜ν™˜λœλ‹€. λ°˜ν™˜λœ μ—”ν‹°ν‹°μ˜ ν•„λ“œλ₯Ό λ³€κ²½ν•œλ‹€. 쑰건이 λ§žλ‹€λ©΄ λ³€κ²½ 사항을 λ°μ΄ν„°λ² μ΄μŠ€λ‘œ μ—…λ°μ΄νŠΈ ν•œλ‹€. ν•˜μ§€λ§Œ μ–΄λ…Έν…Œμ΄μ…˜μ„

2020λ…„ 9μ›” 10일
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[Chatting Server] Stomp둜 μ±„νŒ… κΈ°λŠ₯ ν™•μž₯

πŸš€ WebSocketκ³Ό Stompλ₯Ό 톡해 μ±„νŒ… μ„œλ²„ κ΅¬ν˜„ λ©”μ‹œμ§• 방식을 잘 μ •μ˜ν•œλ‹€λ©΄ WebSocket λ§ŒμœΌλ‘œλ„ μΆ©λΆ„νžˆ 쒋은 Server/Client μ†ŒμΌ“ μ„œλ²„λ₯Ό μ™„μ„±ν•  수 μžˆμŠ΅λ‹ˆλ‹€. ν•˜μ§€λ§Œ λ‹¨μˆœν•œ 톡신 ꡬ쑰둜 인해 WebSocketλ§Œμ„ μ΄μš©ν•΄ μ±„νŒ…μ„ κ΅¬ν˜„ν•˜λ©΄ ν•΄λ‹Ή

2020λ…„ 9μ›” 9일
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[Chatting Server] Basic WebSocket Server

일반적인 HTTP 톡신을 ν•˜λŠ” μ„œλ²„λ“€κ³Ό 달리 μ±„νŒ… μ„œλ²„λŠ” Socket 톡신을 ν•˜λŠ” μ„œλ²„κ°€ ν•„μš”ν•©λ‹ˆλ‹€. ν†΅μƒμ μœΌλ‘œ HTTP 톡신은 Client 의 μš”μ²­μ΄ μžˆμ„ λ•Œλ§Œ μ„œλ²„κ°€ μ‘λ‹΅ν•˜κ³  연결을 μ’…λ£Œν•˜λŠ” 단방ν–₯ 톡신 μž…λ‹ˆλ‹€. λ”°λΌμ„œ Client κ°€ Server 에 접속해 데이터

2020λ…„ 9μ›” 8일
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[JUnit & Mockito] Creating different Test Configuration

ν…ŒμŠ€νŠΈλ₯Ό μ§„ν–‰ν•˜κ²Œ 되면 ν…ŒμŠ€νŠΈ ν™˜κ²½μ— λ§žμΆ°μ„œ ν™˜κ²½ 섀정을 해쀄 ν•„μš”κ°€ μžˆμ„ 수 μžˆμŠ΅λ‹ˆλ‹€. 이럴 λ•Œμ—λŠ” src/test 디렉터리에 μƒˆλ‘œμš΄ resources λΌλŠ” 디렉터리λ₯Ό μƒμ„±ν•΄μ€λ‹ˆλ‹€. 그리고 ν•΄λ‹Ή 디렉터리에 application.yml νŒŒμΌμ„ μƒμ„±ν•΄μ„œ 기쑴의 섀정듀을

2020λ…„ 9μ›” 5일
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[JUnit & Mockito] Integration Test using @SpringBootTest

@SpringBootTestν•΄λ‹Ή 클래슀의 νŒ¨ν‚€μ§€λ₯Ό νƒμƒ‰ν•΄μ„œ @SpringBootApplication μ–΄λ…Έν…Œμ΄μ…˜μ΄ μžˆλŠ” 클래슀λ₯Ό νƒμƒ‰ν•˜κ³  μ‹€ν–‰μ‹œν‚΅λ‹ˆλ‹€. λ§Œμ•½ μ—†λ‹€λ©΄ ν•œ νŒ¨ν‚€μ§€μ”© μ€„μ—¬κ°€λ©΄μ„œ 탐색을 μ΄μ–΄λ‚˜κ°‘λ‹ˆλ‹€. ν•΄λ‹Ή μ• ν”Œλ¦¬μΌ€μ΄μ…˜μ„ μ‹€ν–‰μ‹œμΌœ μ£Όλ―€λ‘œ λͺ¨λ“  μ»΄ν¬λ„ŒνŠΈ(Bean)λ“€

2020λ…„ 9μ›” 5일
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[BlockChain] λŒ€μΉ­ν‚€ μ•”ν˜Έ & λΉ„λŒ€μΉ­ν‚€ μ•”ν˜Έ

μ•”ν˜Έν™”λŠ” 평문을 μ•”ν˜Έλ‘œ λ§Œλ“œλŠ” κ²ƒμž…λ‹ˆλ‹€.(cipher, encrypt)λ³΅ν˜Έν™”λŠ” μ•”ν˜Έλ₯Ό ν‰λ¬ΈμœΌλ‘œ λ§Œλ“œλŠ” κ²ƒμž…λ‹ˆλ‹€.(decipher, decrypt)μ•”ν˜Έν™”μ— μ‚¬μš©ν•œ 킀와 λ³΅ν˜Έν™”μ— μ‚¬μš©ν•œ ν‚€κ°€ λ™μΌν•œ 경우 λŒ€μΉ­ν‚€ μ•”ν˜Έλ‘œ λΆ„λ₯˜λ©λ‹ˆλ‹€.λ°˜λŒ€λ‘œ λ‹€λ₯Ό κ²½μš°μ—λŠ” λΉ„λŒ€μΉ­ν‚€ μ•”ν˜Έλ‘œ λΆ„λ₯˜λ©

2020λ…„ 9μ›” 2일
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[BlockChain] Public, Private, Permissionless, Permissioned

퍼블릭과 ν”„λΌμ΄λΉ—μ˜ ꡬ뢄은 블둝체인에 λ‹€μŒμ„ μˆ˜ν–‰ν•  수 μžˆλŠ”μ§€ ν™•μΈν•˜μ—¬ κ²°μ •:λˆ„κ΅¬λ“ μ§€ 기둝된 정보(블둝)λ₯Ό 자유둭게 읽을 수 μžˆλŠ”μ§€?λͺ…μ‹œμ μΈ 등둝 λ˜λŠ” μžκ²©μ·¨λ“ 없이 정보λ₯Ό 블둝체인 λ„€νŠΈμ›Œν¬μ— 기둝할 수 μžˆλŠ”μ§€?λΈ”λ‘μ²΄μΈμ˜ 정보가 κ³΅κ°œλ˜μ–΄ 있고, λ„€νŠΈμ›Œν¬κ°€ μ •ν•œ κΈ°μ€€(e

2020λ…„ 9μ›” 2일
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[BlockChain] 블둝체인 κΈ°λ³Έ κ°œλ…

정보λ₯Ό 블둝이라고 ν•˜λŠ” λ‹¨μœ„λ‘œ μ €μž₯ν•˜μ—¬ μ €μž₯된 블둝듀을 μ²΄μΈν˜•νƒœλ‘œ 묢은 μ €μž₯ κΈ°μˆ μž…λ‹ˆλ‹€.μž„μ˜μ˜ 길이의 데이터λ₯Ό κ³ μ •λœ 길이의 λ°μ΄ν„°λ‘œ λ§€ν•‘ν•˜λŠ” ν•¨μˆ˜μž…λ‹ˆλ‹€.ν•΄μ‹œ, ν•΄μ‹œ κ°’, ν•΄μ‹œ μ½”λ“œ = ν•΄μ‹œ ν•¨μˆ˜μ— μ˜ν•΄ μ–»μ–΄μ§€λŠ” 값데이터λ₯Ό X, ν•΄μ‹œν•¨μˆ˜λ₯Ό H라고 ν‘œκΈ°ν•  λ•Œ ν•΄μ‹œλ₯Ό H(

2020λ…„ 9μ›” 2일
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[JUnit & Mockito] Controller Unit Tests with Service using @MockBean

λ§Œμ•½ ν…ŒμŠ€νŠΈν•  μ»¨νŠΈλ‘€λŸ¬κ°€ μ˜μ‘΄μ„±μ΄ μžˆλŠ” μ„œλΉ„μŠ€ 빈이 μžˆλ‹€λ©΄ μŠ€ν”„λ§ λΆ€νŠΈμ—μ„œ μ œκ³΅ν•΄μ£ΌλŠ” @MockBean μ–΄λ…Έν…Œμ΄μ…˜μ„ ν†΅ν•΄μ„œ ν•΄λ‹Ή λΉˆμ„ μ£Όμž…μ‹œν‚€κ³  Mock Object둜 μƒμ„±ν•΄μ€λ‹ˆλ‹€. κ·Έλ‹€μŒμ— λ˜‘κ°™μ΄ ν•΄λ‹Ή Mock Object κ°€ κ°€μ§ˆ 행동(Behavior)을 지정해주면

2020λ…„ 8μ›” 28일
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[JUnit & Mockito] Using @MockMvc to test Controllers

μœ λ‹› ν…ŒμŠ€νŠΈλ₯Ό ν•  λ•Œ 컨트둀러 λ‹¨λ§Œ ν…ŒμŠ€νŠΈ ν•΄μ•Όν•˜λŠ” κ²½μš°κ°€ μžˆμŠ΅λ‹ˆλ‹€. 이럴 λ•Œμ—λŠ” μŠ€ν”„λ§ λΆ€νŠΈμ—μ„œ μ œκ³΅ν•΄μ£ΌλŠ” @WebMvcTest() 와 MockMvc λ₯Ό μ‚¬μš©ν•˜λ©΄ λ©λ‹ˆλ‹€.@WebMvcTest(\[ControllerName.class])이 μ–΄λ…Έν…Œμ΄μ…˜μ„ 클래슀 상단뢀에

2020λ…„ 8μ›” 28일
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[JUnit & Mockito] Spying

Mock Object λ₯Ό 생성할 λ•Œ, μƒμ„±ν•œ κ°μ²΄λŠ” μ§€μ •ν•œ 클래슀의 행동(Behavior)λ₯Ό 가지지 λͺ»ν•©λ‹ˆλ‹€. 즉, κ°œλ°œμžκ°€ 직접 ν•΄λ‹Ή 객체의 행동을 μ§€μ •ν•˜μ§€ μ•ŠλŠ” 이상(when(), thenReturn()) ν•΄λ‹Ή 객체가 μˆ˜ν–‰ν•˜λŠ” λͺ¨λ“  행동은 λ””ν΄νŠΈ κ°’μœΌλ‘œ μˆ˜ν–‰ν•˜κ²Œ 됩

2020λ…„ 8μ›” 28일
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[JUnit & Mockito] Verify Method Calls

쑰금 더 κ²¬κ³ ν•˜κ³  μ •ν™•ν•œ ν…ŒμŠ€νŠΈλ₯Ό μ§„ν–‰ν•˜κΈ° μœ„ν•΄μ„œ 가끔은 ν•΄λ‹Ή ν…ŒμŠ€νŠΈ μ•ˆμ—μ„œ νŠΉμ • λ©”μ†Œλ“œλ₯Ό ν˜ΈμΆœν–ˆλŠ”μ§€μ— λŒ€ν•΄μ„œ 검증을 ν•  ν•„μš”κ°€ μžˆμŠ΅λ‹ˆλ‹€. 이λ₯Ό μœ„ν•΄ Mockito μ—μ„œλŠ” verify() λΌλŠ” ν•¨μˆ˜λ₯Ό μ§€μ›ν•΄μ€λ‹ˆλ‹€.verify(mock).method(param);ν•΄λ‹Ή M

2020λ…„ 8μ›” 28일
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[JUnit & Mockito] Return Multiple Values & Argument Matchers

πŸš€ Return Multiple Values λ‹€μŒμœΌλ‘œλŠ” ν•΄λ‹Ή Mock Object에 νŒŒλΌλ―Έν„°μ™€ ν•¨κ»˜ λ©”μ†Œλ“œλ₯Ό μ‚¬μš©ν•  λ•Œμ—λŠ” λ‹€μŒκ³Ό 같이 μž‘μ„±ν•˜μ‹œλ©΄ λ˜λŠ”λ°, λ§Œμ•½ 정해놓은 νŒŒλΌλ―Έν„°λ₯Ό μ‚¬μš©ν•˜μ§€ μ•Šκ³  Mock Objectλ₯Ό μ‚¬μš©ν•˜κ²Œ 되면 μ „λ‹¬ν•œ 값에 ν•΄λ‹Ήν•˜λŠ” λ””ν΄νŠΈκ°’μ΄ 반

2020λ…„ 8μ›” 28일
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