refactor : ElasticSearch 제거 및 QueryDSL 기반 검색/자동완성 기능 구현

.github/workflows/ci.yml

@@ -24,10 +24,6 @@ jobs:
       ACTIVEMQ_PASSWORD: ${{ secrets.ACTIVEMQ_PASSWORD }}
       ACTIVEMQ_PORT: ${{ secrets.ACTIVEMQ_PORT }}
       JUDGE0_URL: ${{ secrets.JUDGE0_URL }}
-      ELASTICSEARCH_ADDRESS: ${{ secrets.ELASTICSEARCH_ADDRESS }}
-      ELASTICSEARCH_USERNAME: ${{ secrets.ELASTICSEARCH_USERNAME }}
-      ELASTICSEARCH_PASSWORD: ${{ secrets.ELASTICSEARCH_PASSWORD }}
-      ELASTICSEARCH_PORT: ${{ secrets.ELASTICSEARCH_PORT }}
       OPEN_API_URL: ${{ secrets.OPEN_API_URL }}
       OPEN_API_KEY: ${{ secrets.OPEN_API_KEY }}
       CLIENT_ID: ${{ secrets.CLIENT_ID }}

build.gradle

@@ -81,10 +81,6 @@ dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-actuator'
     runtimeOnly 'io.micrometer:micrometer-registry-prometheus'
 
-    // elasticsearch + elasticsearch 쿼리빌더 dsl
-    implementation 'org.springframework.boot:spring-boot-starter-data-elasticsearch'
-    implementation 'co.elastic.clients:elasticsearch-java:8.18.2'
-
     // activemq
     implementation 'org.apache.activemq:activemq-broker:6.1.6'
 

readme.md

@@ -140,7 +140,7 @@ my.ezcode.codetest
 | **🖥️ 언어**         | Java 17                                      |
 | **🔧 백엔드**         | Spring Boot, Spring Data JPA, QueryDSL       |
 | **🔐 보안**          | Spring Security, JWT                         |
-| **💾 데이터베이스**      | MySQL, Redis, MongoDB, Elastic search        |
+| **💾 데이터베이스**      | MySQL, Redis, MongoDB                        |
 | **📨 메시지 큐**       | ActiveMQ, Redis Stream                       |
 | **🧠 개발 도구 (IDE)** | IntelliJ IDEA                                |
 | **🌐 외부 API**      | Gmail SMTP, OpenAI, Judge0                   |

src/main/java/org/ezcode/codetest/application/problem/service/ProblemService.java

@@ -2,6 +2,7 @@
 
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 import org.ezcode.codetest.application.problem.dto.request.CategoryCreateRequest;
@@ -26,7 +27,6 @@
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageImpl;
 import org.springframework.data.domain.Pageable;
-import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Propagation;
 import org.springframework.transaction.annotation.Transactional;
@@ -70,9 +70,16 @@ public void createProblem(ProblemCreateRequest requestDto, MultipartFile image,
 
 	}
 
+	// 검색 키워드 자동 완성
+	@Transactional(readOnly = true)
+	public Set<String> getSearchKeywordSuggestions(String keyword) {
+
+		return problemDomainService.getSearchKeywordSuggestions(keyword);
+	}
+
 	// 문제 전체 조회
 	@Transactional(readOnly = true)
-	public Page<ProblemResponse> getProblemsList(Pageable pageable, ProblemSearchCondition searchCondition) {
+	public Page<ProblemResponse> getProblemWithCondition(Pageable pageable, ProblemSearchCondition searchCondition) {
 
 		Page<Problem> problemPage = problemDomainService.getProblemBySearchCondition(pageable, searchCondition);
 		List<Problem> problems = problemPage.getContent();

src/main/java/org/ezcode/codetest/common/config/WebConfig.java

@@ -0,0 +1,15 @@
+package org.ezcode.codetest.common.config;
+
+import org.ezcode.codetest.presentation.problemmanagement.problem.StringToDifficultyConverter;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.format.FormatterRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class WebConfig implements WebMvcConfigurer {
+
+	@Override
+	public void addFormatters(FormatterRegistry registry) {
+		registry.addConverter(new StringToDifficultyConverter());
+	}
+}

src/main/java/org/ezcode/codetest/domain/problem/model/ProblemSearchCondition.java

@@ -1,9 +1,28 @@
 package org.ezcode.codetest.domain.problem.model;
 
+import org.ezcode.codetest.domain.problem.model.enums.Difficulty;
+
 public record ProblemSearchCondition(
-	String category,
 
-	String difficulty
+	String categoryCode,
+
+	Difficulty difficulty,
+
+	String keyword
 
 ) {
+
+	public ProblemSearchCondition {
+
+		categoryCode = cleanString(categoryCode);
+		keyword = cleanString(keyword);
+	}
+
+	private static String cleanString(String input) {
+
+		if (input == null || input.isBlank()) {
+			return null;
+		}
+		return input.trim();
+	}
 }