GraphQL 서버 구축하기

repositories {
    jcenter()
    mavenCentral()
}

dependencies {
  //...다른 라이브러리

  implementation 'com.graphql-java-kickstart:graphql-spring-boot-starter:11.0.0'
  implementation 'com.graphql-java-kickstart:playground-spring-boot-starter:11.0.0'
  testImplementation 'com.graphql-java-kickstart:graphql-spring-boot-starter-test:11.0.0'
}

dependencies {
  // to embed Altair tool
  runtimeOnly 'com.graphql-java-kickstart:altair-spring-boot-starter:11.0.0'
  // to embed GraphiQL tool
  runtimeOnly 'com.graphql-java-kickstart:graphiql-spring-boot-starter:11.0.0'
  // to embed Voyager tool
  runtimeOnly 'com.graphql-java-kickstart:voyager-spring-boot-starter:11.0.0'
  // testing facilities
  }

graphql.servlet.mapping=/graphql
graphql.tools.schema-location-pattern=**/*.graphqls
graphql.servlet.cors-enabled=true
graphql.servlet.max-query-depth=100
graphql.servlet.exception-handlers-enabled=true

schema {
  query: Query
}

type Query {
  getStations(gpsY: Float!, gpsX: Float!, distance: Float!): [Station]
}

type Station {
  stationId: Int!
  stationName: String!
  mobileNumber: String!
  distance: Int!
}

@Builder
@Entity
@Getter @Setter @NoArgsConstructor @AllArgsConstructor
@EqualsAndHashCode(of = "id")
public class Station {
    @Id
    private Integer id;

    private String stationName;

    @Column(columnDefinition = "POINT")
    @JsonSerialize(using = GeometrySerializer.class)
    @JsonDeserialize(contentUsing = GeometryDeserializer.class)
    private Point gps;

    private String mobileNumber;
}

@Builder
@NoArgsConstructor
@AllArgsConstructor
@Data
public class StationGraphQLDto {
    @NotNull
    private Integer stationId;

    @NotEmpty
    private String stationName;

    @NotEmpty
    private String mobileNumber;

    @NotNull
    private Integer distance;
}

@Component
public class WetayoQuery implements GraphQLQueryResolver {
    private final StationService stationService;
    private final ModelMapper modelMapper;

    WetayoQuery(StationService stationService, ModelMapper modelMapper,) {
        this.stationService = stationService;
        this.modelMapper = modelMapper;
    }

    public List<StationGraphQLDto> getStations(Double x, Double y, Double distance) {
        List<Station> stations = stationService.getNearByStations(x, y, distance);  //근처 정류장 조회
        List<StationGraphQLDto> stationDtos = Arrays.asList(modelMapper.map(stations, StationGraphQLDto[].class)); //distance 필드가 포함된 DTO로 맵핑

        /*distance 계산*/
        int index = 0;
        for (StationGraphQLDto stationDto : stationDtos) {
            stationDto.setDistance(GeometryUtil.calculateDistance(x, y,
                    stations.get(index).getGps().getX(), stations.get(index++).getGps().getY()));
        }
        stationDtos.sort((o1, o2) -> o1.getDistance().compareTo(o2.getDistance()));

        return stationDtos;
    }
}