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BookStoreCompositeAppService.java
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/
BookStoreCompositeAppService.java
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package io.bookup.book.app;
import io.bookup.book.domain.Book;
import io.bookup.book.domain.BookStore;
import io.bookup.book.domain.NotFoundBookException;
import io.bookup.book.infra.BookFinder;
import io.bookup.book.infra.crawler.AladinBookCrawler;
import io.bookup.book.infra.crawler.BandinLunisBookCrawler;
import io.bookup.book.infra.rest.KyoboBookRestTemplate;
import io.bookup.book.infra.rest.NaverBook;
import io.bookup.book.infra.rest.NaverBookRestTemplate;
import io.bookup.common.utils.FutureUtils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
import org.springframework.stereotype.Service;
/**
* @author woniper
*/
@Service
public class BookStoreCompositeAppService {
private final NaverBookRestTemplate naverBookRestTemplate;
private final List<BookFinder<List<BookStore>>> bookStoreFinders;
public BookStoreCompositeAppService(NaverBookRestTemplate naverBookRestTemplate,
AladinBookCrawler aladinBookCrawler,
BandinLunisBookCrawler bandinLunisBookCrawler,
KyoboBookRestTemplate kyoboBookRestTemplate) {
this.naverBookRestTemplate = naverBookRestTemplate;
this.bookStoreFinders = Arrays.asList(
aladinBookCrawler,
bandinLunisBookCrawler,
kyoboBookRestTemplate
);
}
public Book getBook(String isbn) {
CompletableFuture<Book> bookFuture =
CompletableFuture.supplyAsync(() -> mapBook(naverBookRestTemplate.findByIsbn(isbn)))
.thenApplyAsync(x -> x.merge(getBookStores(isbn)));
return FutureUtils.getFutureItem(bookFuture)
.orElseThrow(() -> new NotFoundBookException(isbn));
}
private List<BookStore> getBookStores(String isbn) {
List<BookStore> bookStores = new ArrayList<>();
bookStoreFinders.stream()
.map(x -> CompletableFuture.supplyAsync(() -> x.findByIsbn(isbn)))
.collect(Collectors.toList())
.forEach(x -> bookStores.addAll(FutureUtils.getFutureItem(x).orElse(Collections.emptyList())));
return bookStores;
}
private Book mapBook(NaverBook.Item item) {
return new Book(item.getTitle(), item.getDescription());
}
}