Services

1me.namila.RestSpringTest.Service.MainService.java

public interface MainService <T>
{
	 Page<T> getAll( Pageable pageable);
	 T add( T o);
	 T update (T o, int id);
	 T getById( int id );
	 T deleteById(int id);
}

me.namila.RestSpringTest.Service.AuthorService.java

public abstract class AuthorService  implements MainService<Author>
{
	public abstract List<Book> getBooksById( int id );
}

me.namila.RestSpringTest.Service.BookService.java

public abstract class BookService implements MainService<Book>
{
}

me.namila.RestSpringTest.Service.PublisherService.java

public abstract class PublisherService implements MainService<Publisher>
{
	public abstract List<Book> getBooksById( int id );
}