@Override
public void rateBooks(Set<BookRating> bookRating) throws BookStoreException {
// TODO Auto-generated method stub
// lock update lock, only allow read
bsLock.updateLock().lock();
try {
/* Check if the input is valid */
if (bookRating == null) throw new BookStoreException(BookStoreConstants.NULL_INPUT);
int ISBN, rating;
BookStoreBook book;
for (BookRating br : bookRating) {
ISBN = br.getISBN();
rating = br.getRating();
if (BookStoreUtility.isInvalidISBN(ISBN))
throw new BookStoreException(BookStoreConstants.ISBN + ISBN + BookStoreConstants.INVALID);
if (!bookMap.containsKey(ISBN))
throw new BookStoreException(
BookStoreConstants.ISBN + ISBN + BookStoreConstants.NOT_AVAILABLE);
if (BookStoreUtility.isInvalidRating(rating))
throw new BookStoreException(
BookStoreConstants.RATING + rating + BookStoreConstants.INVALID);
}
try {
bsLock.writeLock().lock(); // upgrade to write lock
/* Inputs are valid so, ready to rate the books change */
for (BookRating br : bookRating) {
book = bookMap.get(br.getISBN());
book.addRating(br.getRating());
}
} finally {
bsLock.writeLock().unlock(); // downgrade to update lock
}
} finally {
bsLock.updateLock().unlock();
}
return;
}
