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feat: 랭킹 TOP20 조회 API 구현 (#73)
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‎src/main/java/targeter/aim/domain/challenge/controller/ChallengeRankController.java‎

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package targeter.aim.domain.challenge.controller;
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import io.swagger.v3.oas.annotations.Operation;
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import io.swagger.v3.oas.annotations.tags.Tag;
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import lombok.RequiredArgsConstructor;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import targeter.aim.domain.challenge.dto.RankDto;
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import targeter.aim.domain.challenge.service.ChallengeRankService;
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import targeter.aim.system.security.annotation.NoJwtAuth;
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import java.util.List;
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@RestController
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@RequiredArgsConstructor
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@RequestMapping("/api/challenges")
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@Tag(name = "Challenge (Rank)", description = "랭킹 조회 API")
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public class ChallengeRankController {
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private final ChallengeRankService challengeRankService;
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@NoJwtAuth
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@GetMapping("/rank/top20")
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@Operation(
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summary = "랭킹 TOP 20 조회",
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description = "레벨이 가장 높은 유저 20명을 랭킹으로 조회합니다. 1~3위는 all/solo/vs 기록, 4~20위는 all 기록만 포함됩니다."
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)
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public List<RankDto.Top20RankResponse> getTop20Rank() {
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return challengeRankService.getTop20Rank();
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}
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}

‎src/main/java/targeter/aim/domain/challenge/dto/RankDto.java‎

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package targeter.aim.domain.challenge.dto;
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import io.swagger.v3.oas.annotations.media.Schema;
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import lombok.*;
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import targeter.aim.domain.file.dto.FileDto;
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public class RankDto {
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@Data
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@Builder
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@NoArgsConstructor
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@AllArgsConstructor
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@Schema(description = "TOP20 랭킹 조회 응답")
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public static class Top20RankResponse {
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@Schema(description = "순위")
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private int rank;
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@Schema(description = "유저 ID")
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private Long userId;
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@Schema(description = "유저 정보")
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private UserInfo userInfo;
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@Schema(description = "전체 기록")
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private ChallengeRecord allRecord;
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@Schema(description = "SOLO 기록 (1~3위만 내려줌)")
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private ChallengeRecord soloRecord;
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@Schema(description = "VS 기록 (1~3위만 내려줌)")
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private ChallengeRecord vsRecord;
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}
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@Data
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@Builder
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@NoArgsConstructor
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@AllArgsConstructor
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public static class UserInfo {
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private String nickname;
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private FileDto.FileResponse profileImage;
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private TierResponse tier;
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private Integer level;
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}
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@Data
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@Builder
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@NoArgsConstructor
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@AllArgsConstructor
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public static class TierResponse {
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private String name;
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}
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@Data
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@Builder
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@NoArgsConstructor
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@AllArgsConstructor
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@Schema(description = "챌린지 기록(시도/성공/실패/성공률)")
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public static class ChallengeRecord {
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private long attemptCount;
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private long successCount;
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private long failCount;
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@Schema(description = "성공률(0~100)")
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private int successRate;
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}
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}

‎src/main/java/targeter/aim/domain/challenge/repository/ChallengeRankQueryRepository.java‎

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package targeter.aim.domain.challenge.repository;
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import com.querydsl.core.Tuple;
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import com.querydsl.core.types.dsl.CaseBuilder;
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import com.querydsl.core.types.dsl.NumberExpression;
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import com.querydsl.core.types.dsl.Expressions;
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import com.querydsl.jpa.JPAExpressions;
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import com.querydsl.jpa.impl.JPAQueryFactory;
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import lombok.RequiredArgsConstructor;
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import org.springframework.stereotype.Repository;
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import targeter.aim.domain.challenge.entity.ChallengeMode;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import static targeter.aim.domain.challenge.entity.QChallenge.challenge;
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import static targeter.aim.domain.challenge.entity.QWeeklyProgress.weeklyProgress;
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@Repository
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@RequiredArgsConstructor
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public class ChallengeRankQueryRepository {
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private final JPAQueryFactory queryFactory;
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public record Record(long attempt, long success) {}
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/**
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* challenge 1개 단위로 유저 성공률(complete/total) >= 0.7 이면 성공으로 카운트.
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* attempt = 참여한 챌린지 수
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* success = 성공 챌린지 수
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*/
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public Map<Long, Record> calcRecordByUsers(List<Long> userIds, ChallengeMode mode) {
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if (userIds == null || userIds.isEmpty()) {
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return Map.of();
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}
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List<Tuple> attemptRows = queryFactory
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.select(weeklyProgress.user.id, weeklyProgress.challenge.id.countDistinct())
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.from(weeklyProgress)
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.join(weeklyProgress.challenge, challenge)
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.where(
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weeklyProgress.user.id.in(userIds),
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mode == null ? null : challenge.mode.eq(mode)
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)
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.groupBy(weeklyProgress.user.id)
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.fetch();
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Map<Long, Long> attemptMap = new HashMap<>();
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for (Tuple t : attemptRows) {
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Long uid = t.get(weeklyProgress.user.id);
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Long cnt = t.get(weeklyProgress.challenge.id.countDistinct());
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attemptMap.put(uid, cnt == null ? 0L : cnt);
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}
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// completeCnt / totalCnt (challenge 단위)
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NumberExpression<Integer> completeCnt = new CaseBuilder()
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.when(weeklyProgress.isComplete.isTrue()).then(1)
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.otherwise(0)
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.sum();
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NumberExpression<Long> totalCnt = weeklyProgress.id.count();
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NumberExpression<Double> ratio = Expressions.numberTemplate(
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Double.class,
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"({0} * 1.0) / {1}",
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completeCnt,
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totalCnt
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);
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List<Tuple> successRows = queryFactory
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.select(weeklyProgress.user.id, weeklyProgress.challenge.id.countDistinct())
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.from(weeklyProgress)
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.join(weeklyProgress.challenge, challenge)
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.where(
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weeklyProgress.user.id.in(userIds),
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mode == null ? null : challenge.mode.eq(mode),
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Expressions.list(weeklyProgress.user.id, weeklyProgress.challenge.id).in(
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JPAExpressions
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.select(weeklyProgress.user.id, weeklyProgress.challenge.id)
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.from(weeklyProgress)
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.join(weeklyProgress.challenge, challenge)
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.where(
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weeklyProgress.user.id.in(userIds),
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mode == null ? null : challenge.mode.eq(mode)
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)
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.groupBy(weeklyProgress.user.id, weeklyProgress.challenge.id)
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.having(ratio.goe(0.7))
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)
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)
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.groupBy(weeklyProgress.user.id)
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.fetch();
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Map<Long, Long> successMap = new HashMap<>();
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for (Tuple t : successRows) {
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Long uid = t.get(weeklyProgress.user.id);
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Long cnt = t.get(weeklyProgress.challenge.id.countDistinct());
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successMap.put(uid, cnt == null ? 0L : cnt);
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}
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Map<Long, Record> result = new HashMap<>();
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for (Long uid : userIds) {
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long attempt = attemptMap.getOrDefault(uid, 0L);
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long success = successMap.getOrDefault(uid, 0L);
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result.put(uid, new Record(attempt, success));
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}
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return result;
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}
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}

‎src/main/java/targeter/aim/domain/challenge/service/ChallengeRankService.java‎

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package targeter.aim.domain.challenge.service;
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import lombok.RequiredArgsConstructor;
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import org.springframework.data.domain.PageRequest;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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import targeter.aim.domain.challenge.dto.RankDto;
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import targeter.aim.domain.challenge.entity.ChallengeMode;
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import targeter.aim.domain.challenge.repository.ChallengeRankQueryRepository;
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import targeter.aim.domain.file.dto.FileDto;
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import targeter.aim.domain.user.entity.User;
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import targeter.aim.domain.user.repository.UserRepository;
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import java.util.*;
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import java.util.stream.Collectors;
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@Service
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@RequiredArgsConstructor
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public class ChallengeRankService {
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private final UserRepository userRepository;
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private final ChallengeRankQueryRepository challengeRankQueryRepository;
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@Transactional(readOnly = true)
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public List<RankDto.Top20RankResponse> getTop20Rank() {
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List<User> users = userRepository.findAllByOrderByLevelDescIdAsc(PageRequest.of(0, 20)).getContent();
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if (users.isEmpty()) {
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return List.of();
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}
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List<Long> userIds = users.stream().map(User::getId).toList();
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Map<Long, ChallengeRankQueryRepository.Record> overallMap =
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challengeRankQueryRepository.calcRecordByUsers(userIds, null);
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Map<Long, ChallengeRankQueryRepository.Record> soloMap =
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challengeRankQueryRepository.calcRecordByUsers(userIds, ChallengeMode.SOLO);
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Map<Long, ChallengeRankQueryRepository.Record> vsMap =
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challengeRankQueryRepository.calcRecordByUsers(userIds, ChallengeMode.VS);
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Map<Long, Integer> rankByUserId = new HashMap<>();
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for (int i = 0; i < users.size(); i++) {
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rankByUserId.put(users.get(i).getId(), i + 1);
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}
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return users.stream()
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.map(u -> {
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int rank = rankByUserId.get(u.getId());
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RankDto.UserInfo userInfo = RankDto.UserInfo.builder()
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.nickname(u.getNickname())
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.profileImage(u.getProfileImage() == null ? null : FileDto.FileResponse.from(u.getProfileImage()))
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.tier(RankDto.TierResponse.builder().name(u.getTier().getName()).build())
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.level(u.getLevel())
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.build();
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RankDto.ChallengeRecord allRecord = toRecordDto(overallMap.get(u.getId()));
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// 1~3위만 solo/vs 포함
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RankDto.ChallengeRecord soloRecord = (rank <= 3) ? toRecordDto(soloMap.get(u.getId())) : null;
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RankDto.ChallengeRecord vsRecord = (rank <= 3) ? toRecordDto(vsMap.get(u.getId())) : null;
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return RankDto.Top20RankResponse.builder()
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.rank(rank)
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.userId(u.getId())
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.userInfo(userInfo)
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.allRecord(allRecord)
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.soloRecord(soloRecord)
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.vsRecord(vsRecord)
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.build();
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})
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.collect(Collectors.toList());
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}
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private RankDto.ChallengeRecord toRecordDto(ChallengeRankQueryRepository.Record record) {
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if (record == null) {
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return RankDto.ChallengeRecord.builder()
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.attemptCount(0)
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.successCount(0)
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.failCount(0)
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.successRate(0)
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.build();
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}
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long attempt = record.attempt();
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long success = record.success();
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long fail = attempt - success;
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int successRate = attempt == 0 ? 0 : (int) Math.round((success * 100.0) / attempt);
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return RankDto.ChallengeRecord.builder()
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.attemptCount(attempt)
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.successCount(success)
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.failCount(fail)
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.successRate(successRate)
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.build();
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}
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}

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