public void addCopies(Set<BookCopy> bookCopiesSet) throws BookStoreException {
int ISBN, numCopies;
if (bookCopiesSet == null) {
throw new BookStoreException(BookStoreConstants.NULL_INPUT);
}
try {
bsLock.updateLock().lock();
for (BookCopy bookCopy : bookCopiesSet) {
ISBN = bookCopy.getISBN();
numCopies = bookCopy.getNumCopies();
if (BookStoreUtility.isInvalidISBN(ISBN))
throw new BookStoreException(BookStoreConstants.ISBN + ISBN + BookStoreConstants.INVALID);
if (!bookMap.containsKey(ISBN))
throw new BookStoreException(BookStoreConstants.ISBN + ISBN + BookStoreConstants.INVALID);
if (BookStoreUtility.isInvalidNoCopies(numCopies))
throw new BookStoreException(
BookStoreConstants.NUM_COPIES + numCopies + BookStoreConstants.INVALID);
}
bsLock.writeLock().lock();
BookStoreBook book;
// Update the number of copies
for (BookCopy bookCopy : bookCopiesSet) {
ISBN = bookCopy.getISBN();
numCopies = bookCopy.getNumCopies();
book = bookMap.get(ISBN);
book.addCopies(numCopies);
}
} finally {
bsLock.writeLock().unlock();
bsLock.updateLock().unlock();
}
}
public List<Book> getBooks(Set<Integer> isbnSet) throws BookStoreException {
if (isbnSet == null) {
throw new BookStoreException(BookStoreConstants.NULL_INPUT);
}
List<Book> listBooks = new ArrayList<Book>();
try {
bsLock.readLock().lock();
// Check that all ISBNs that we rate are there first.
for (Integer ISBN : isbnSet) {
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);
}
// Get the books
for (Integer ISBN : isbnSet) {
listBooks.add(bookMap.get(ISBN).immutableBook());
}
} finally {
bsLock.readLock().unlock();
}
return listBooks;
}
public void updateEditorPicks(Set<BookEditorPick> editorPicks) throws BookStoreException {
// Check that all ISBNs that we add/remove are there first.
if (editorPicks == null) {
throw new BookStoreException(BookStoreConstants.NULL_INPUT);
}
int ISBNVal;
try {
bsLock.updateLock().lock();
for (BookEditorPick editorPickArg : editorPicks) {
ISBNVal = editorPickArg.getISBN();
if (BookStoreUtility.isInvalidISBN(ISBNVal))
throw new BookStoreException(
BookStoreConstants.ISBN + ISBNVal + BookStoreConstants.INVALID);
if (!bookMap.containsKey(ISBNVal))
throw new BookStoreException(
BookStoreConstants.ISBN + ISBNVal + BookStoreConstants.NOT_AVAILABLE);
}
bsLock.writeLock().lock();
for (BookEditorPick editorPickArg : editorPicks) {
bookMap.get(editorPickArg.getISBN()).setEditorPick(editorPickArg.isEditorPick());
}
} finally {
bsLock.writeLock().unlock();
bsLock.updateLock().unlock();
}
return;
}
public List<StockBook> getBooks() {
List<StockBook> listBooks = new ArrayList<StockBook>();
try {
bsLock.readLock().lock();
Collection<BookStoreBook> bookMapValues = bookMap.values();
for (BookStoreBook book : bookMapValues) {
listBooks.add(book.immutableStockBook());
}
} finally {
bsLock.readLock().unlock();
}
return listBooks;
}
@Override
public List<Book> getTopRatedBooks(int numBooks) throws BookStoreException {
// TODO Auto-generated method stub
// No negative number
if (numBooks <= 0) {
throw new BookStoreException("numBooks = " + numBooks + ", but it must be positive");
}
Collection<BookStoreBook> books = bookMap.values();
if (books.isEmpty()) {
throw new BookStoreException("No books in the bookstore");
}
List<BookStoreBook> listRatedBooks = new ArrayList<BookStoreBook>();
List<Book> listTopRatedBooks = new ArrayList<Book>();
try {
bsLock.readLock().lock(); // block other from writing data
// we only count the book has a rating
for (BookStoreBook book : books) {
if (book.getAverageRating() > 0) listRatedBooks.add(book);
}
Comparator<BookStoreBook> comparator =
new Comparator<BookStoreBook>() {
public int compare(BookStoreBook book1, BookStoreBook book2) {
return Float.compare(
book2.getAverageRating(), book1.getAverageRating()); // get right order of books
}
};
Collections.sort(listRatedBooks, comparator);
for (BookStoreBook book : listRatedBooks) {
listTopRatedBooks.add(book.immutableStockBook());
if (listTopRatedBooks.size() == numBooks) break;
}
} finally {
bsLock.readLock().unlock();
}
// return the certain amount of books by its rating
return listTopRatedBooks;
}
public void buyBooks(Set<BookCopy> bookCopiesToBuy) throws BookStoreException {
if (bookCopiesToBuy == null) {
throw new BookStoreException(BookStoreConstants.NULL_INPUT);
}
// Check that all ISBNs that we buy are there first.
int ISBN;
BookStoreBook book;
Boolean saleMiss = false;
try {
bsLock.updateLock().lock();
for (BookCopy bookCopyToBuy : bookCopiesToBuy) {
ISBN = bookCopyToBuy.getISBN();
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);
book = bookMap.get(ISBN);
if (!book.areCopiesInStore(bookCopyToBuy.getNumCopies())) {
book.addSaleMiss(); // If we cannot sell the copies of the
// book
// its a miss
saleMiss = true;
}
}
// We throw exception now since we want to see how many books in the
// order incurred misses which is used by books in demand
if (saleMiss)
throw new BookStoreException(BookStoreConstants.BOOK + BookStoreConstants.NOT_AVAILABLE);
bsLock.writeLock().lock();
// Then make purchase
for (BookCopy bookCopyToBuy : bookCopiesToBuy) {
book = bookMap.get(bookCopyToBuy.getISBN());
book.buyCopies(bookCopyToBuy.getNumCopies());
}
} finally {
bsLock.writeLock().unlock();
bsLock.updateLock().unlock();
}
return;
}
@Override
public List<StockBook> getBooksInDemand() throws BookStoreException {
// TODO Auto-generated method stub
bsLock.updateLock().lock();
List<StockBook> listBooksInDemand = new ArrayList<StockBook>();
Collection<BookStoreBook> books = bookMap.values();
if (books.isEmpty()) {
throw new BookStoreException("No books in the bookstore");
}
try {
for (BookStoreBook book : books) {
if (book.hadSaleMiss()) {
listBooksInDemand.add(book.immutableStockBook());
}
}
} finally {
bsLock.updateLock().unlock();
}
return listBooksInDemand;
}
@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;
}
public List<Book> getEditorPicks(int numBooks) throws BookStoreException {
if (numBooks < 0) {
throw new BookStoreException("numBooks = " + numBooks + ", but it must be positive");
}
List<BookStoreBook> listAllEditorPicks = new ArrayList<BookStoreBook>();
List<Book> listEditorPicks = new ArrayList<Book>();
try {
bsLock.readLock().lock();
Iterator<Entry<Integer, BookStoreBook>> it = bookMap.entrySet().iterator();
BookStoreBook book;
// Get all books that are editor picks
while (it.hasNext()) {
Entry<Integer, BookStoreBook> pair = (Entry<Integer, BookStoreBook>) it.next();
book = (BookStoreBook) pair.getValue();
if (book.isEditorPick()) {
listAllEditorPicks.add(book);
}
}
// Find numBooks random indices of books that will be picked
Random rand = new Random();
Set<Integer> tobePicked = new HashSet<Integer>();
int rangePicks = listAllEditorPicks.size();
if (rangePicks < numBooks) {
throw new BookStoreException("Only " + rangePicks + " editor picks are available.");
}
int randNum;
while (tobePicked.size() < numBooks) {
randNum = rand.nextInt(rangePicks);
tobePicked.add(randNum);
}
// Get the numBooks random books
for (Integer index : tobePicked) {
book = listAllEditorPicks.get(index);
listEditorPicks.add(book.immutableBook());
}
} finally {
bsLock.readLock().unlock();
}
return listEditorPicks;
}
public void addBooks(Set<StockBook> bookSet) throws BookStoreException {
if (bookSet == null) {
throw new BookStoreException(BookStoreConstants.NULL_INPUT);
}
try {
// Check if all are there
bsLock.updateLock().lock();
for (StockBook book : bookSet) {
int ISBN = book.getISBN();
String bookTitle = book.getTitle();
String bookAuthor = book.getAuthor();
int noCopies = book.getNumCopies();
float bookPrice = book.getPrice();
if (BookStoreUtility.isInvalidISBN(ISBN)
|| BookStoreUtility.isEmpty(bookTitle)
|| BookStoreUtility.isEmpty(bookAuthor)
|| BookStoreUtility.isInvalidNoCopies(noCopies)
|| bookPrice < 0.0) {
throw new BookStoreException(
BookStoreConstants.BOOK + book.toString() + BookStoreConstants.INVALID);
} else if (bookMap.containsKey(ISBN)) {
throw new BookStoreException(
BookStoreConstants.ISBN + ISBN + BookStoreConstants.DUPLICATED);
}
}
bsLock.writeLock().lock();
for (StockBook book : bookSet) {
int ISBN = book.getISBN();
bookMap.put(ISBN, new BookStoreBook(book));
}
} finally {
bsLock.writeLock().unlock();
bsLock.updateLock().unlock();
}
return;
}
