Medium - Dependency injection - 1

gistfile1.java

public interface BookRepository {
  public List<Book> getAllBooks();
  public List<Book> getAllBooksFromUser(int userId);
  public List<Book> getAllBooksByCategory(BookCategory category);
  public Book getBook(int bookId);
  public Book getBookByName(String bookName);
  public void removeBook(int bookId);
  public void markAsCompleted(int bookId);
}