6.6 實作一個 Service Layer

1.我們先定義出一個 Service Java 介面，用來針對 Book 進行 CRUD 料庫的存取操作。

程式源碼如下 ：

package edume.microservice.service;

import java.util.Map;
import edume.microservice.model.Book;

public interface IBookService
{
    public Map<String, Object> createBook(Map<String, Object> bookMap);
    public Map<String, Object> editBook(String bookId, Map<String, Object> bookMap);
    public Map<String, String> deleteBook(String bookId);
    public Book getBookDetails(String bookId);
    public Map<String, Object> getAllBooks();
}

2.實作上述 IBookService 介面。

源碼如下 ：

package edume.microservice.service;

import java.util.List;.

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import edume.microservice.model.Book;
import edume.microservice.repository.BookRepository;

@Service
public class BookService implements IBookService
{
    private Log logger = LogFactory.getLog(BookService.class);

    @Autowired
    private BookRepository bookRepository = null;

    @Override
    public void createBook(Book book)
    {
        this.bookRepository.save(book);
    }

    public void updateBook(Book book)
    {
        this.bookRepository.save(book);
    }

    @Override
    public Book getBook(String bookId)
    {
        return this.bookRepository.findOne(bookId);
    }

    @Override
    public List<Book> getAllBooks()
    {
        return this.bookRepository.findAll();
    }

    @Override
    public void deleteBook(String bookId)
    {
        this.bookRepository.delete(bookId);
    }
}