5주차

섹션 4. 두 번째 요구사항 추가하기 - 도서 대출 현황

섹션 5. 세 번째 요구사항 추가하기 - 책 통계

https://www.inflearn.com/course/java-to-kotlin-2/dashboard

실전! 코틀린과 스프링 부트로 도서관리 애플리케이션 개발하기 (Java 프로젝트 리팩토링) - 인프

repository (book)

package com.group.libraryapp.domain.book

import com.group.libraryapp.dto.book.response.BookStatResponse
import org.springframework.data.jpa.repository.JpaRepository
import org.springframework.data.jpa.repository.Query
import java.util.Optional

interface BookRepository : JpaRepository<Book, Long>{
    fun findByName(bookName: String): Book?

}

(user)

package com.group.libraryapp.domain.user

import org.springframework.data.jpa.repository.JpaRepository
import org.springframework.data.jpa.repository.Query
import java.util.*

interface UserRepository: JpaRepository<User,Long>, UserRepositoryCustom{
    fun findByName(name: String) : User?


}

book dto

request

package com.group.libraryapp.dto.book.request

data class BookLoanRequest(val userName: String, val bookName: String)

package com.group.libraryapp.dto.book.request

import com.group.libraryapp.domain.book.BookType

data class BookRequest(
    val name: String,
    val type: BookType,
    )

package com.group.libraryapp.dto.book.request

data class BookReturnRequest(val userName: String, val bookName: String)

response

package com.group.libraryapp.dto.book.response

import com.group.libraryapp.domain.book.BookType

data class BookStatResponse(
    val type: BookType,
    val count: Long,
)
// {
//    fun plusOne(){
//        count++
//    }
//}

bookservice

package com.group.libraryapp.service.book

import com.group.libraryapp.domain.book.Book
import com.group.libraryapp.domain.book.BookRepository
import com.group.libraryapp.domain.book.BookType
import com.group.libraryapp.domain.user.UserRepository
import com.group.libraryapp.domain.user.loanhistory.UserLoanHistory
import com.group.libraryapp.domain.user.loanhistory.UserLoanHistoryRepository
import com.group.libraryapp.domain.user.loanhistory.UserLoanStatus
import com.group.libraryapp.dto.book.request.BookLoanRequest
import com.group.libraryapp.dto.book.request.BookRequest
import com.group.libraryapp.dto.book.request.BookReturnRequest
import com.group.libraryapp.dto.book.response.BookStatResponse
import com.group.libraryapp.repository.book.BookQuerydslRepository
import com.group.libraryapp.repository.user.loanhistory.UserLoanHistoryQuerydslRepository
import com.group.libraryapp.util.fail
import org.springframework.stereotype.Service
import org.springframework.transaction.annotation.Transactional

@Service
class BookService(
    private val bookRepository: BookRepository,
    private val bookQuerydslRepository: BookQuerydslRepository,
    private val userRepository: UserRepository,
    private val userLoanHistoryQuerydslRepository: UserLoanHistoryQuerydslRepository,
) {
    @Transactional
    fun saveBook(request: BookRequest){
        val newBook = Book(request.name,request.type)
        bookRepository.save(newBook)
    }

    @Transactional
    fun loanBook(request: BookLoanRequest){
        val book = bookRepository.findByName(request.bookName)?: fail()
        if (userLoanHistoryQuerydslRepository.find(request.bookName,UserLoanStatus.LOANED) != null){
            throw IllegalArgumentException("진작 대출되어 있는 책입니다")
        }
        val user= userRepository.findByName(request.userName)?: fail()
        user.loanBook(book)
    }

    @Transactional
    fun returnBook(request: BookReturnRequest){
        val user = userRepository.findByName(request.userName)?: fail()
        user.returnBook(request.bookName)
    }

    @Transactional(readOnly = true)
    fun countLoanedBook(): Int {
        return userLoanHistoryQuerydslRepository.count(UserLoanStatus.LOANED).toInt()
    }

    @Transactional(readOnly = true)
    fun getBookStatics(): List<BookStatResponse> {
        return bookQuerydslRepository.getStats()

    }
}