/** {@inheritDoc} */
@Override
public Book findByIsbn(final String isbn) {
BookPrimaryKey bookPrimaryKey = new BookPrimaryKey(isbn);
BookKey bookKey =
bookIndexCache.get(
new ServiceContext<BookKey>() {
public BookKey execute() {
Book book = bookStorage.findByIsbn(isbn);
if (book == null) {
return null;
}
BookKey bookKey = new BookKey(book);
exoBookCache.put(bookKey, new BookData(book));
return bookKey;
}
},
bookPrimaryKey);
if (bookKey != null) {
return findById(bookKey.getId());
}
return null;
}
/**
* Build the book list from the caches Ids.
*
* @param data ids
* @return books
*/
private List<Book> buildBooks(ListBooksData data) {
List<Book> books = new ArrayList<Book>();
for (BookKey k : data.getIds()) {
Book gotBook = findById(k.getId());
books.add(gotBook);
}
return books;
}