/// <summary>
/// loads the contents of the secondary cache into the primary cache (if its still current)
/// </summary>
/// <param name="books"></param>
/// <param name="textSearches"></param>
/// <param name="similaritySearches"></param>
public void LoadCache(Dictionary<string, Book> books,
Dictionary<string, List<Book>> textSearches,
Dictionary<string, List<Book>> similaritySearches)
{
books.Clear();
textSearches.Clear();
similaritySearches.Clear();
List<Book> currentTextSearch = null;
List<Book> currentSimilaritySearch = null;
using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
//there is no cache so quit early
if (isoStore.GetFileNames(Constants.SECONDARY_CACHE_FILE).Length == 0)
{
return;
}
using (IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream(Constants.SECONDARY_CACHE_FILE, FileMode.Open, isoStore))
{
using (XmlReader reader = XmlReader.Create(isoStream))
{
while (reader.Read())
{
//get the timestamp and quit early if the cache has been invalidated
if (reader.IsStartElement("tarantula"))
{
if (!string.IsNullOrEmpty(reader.GetAttribute("notimeout")))
{
_notimeout = true;
}
//ignore timeouts if the override has been applied to the secondary cache
if (!_notimeout)
{
long cacheTimeStamp = long.Parse(reader.GetAttribute("timestamp"));
cacheTimeStamp += (long) (_timeOut*TimeSpan.TicksPerSecond);
if (DateTime.Now.Ticks > cacheTimeStamp)
{
return;
}
}
}
#region read a book into the primary cache
if (reader.IsStartElement("book"))
{
Book newBook = new Book();
newBook.ItemID = reader.GetAttribute("itemid");
newBook.Author = reader.GetAttribute("author");
newBook.DetailURL = reader.GetAttribute("detailurl");
newBook.LargeImageURL = reader.GetAttribute("largeimageurl");
newBook.LowestNewPrice = reader.GetAttribute("lowestnewprice");
newBook.LowestUsedPrice = reader.GetAttribute("lowestusedprice");
newBook.SmallImageURL = reader.GetAttribute("smallimageurl");
newBook.Title = reader.GetAttribute("title");
books.Add(newBook.ItemID, newBook);
}
#endregion
#region begin reading a new text search into the primary cache
if (reader.IsStartElement("textsearch"))
{
currentTextSearch = new List<Book>();
textSearches.Add(reader.GetAttribute("searchtext"), currentTextSearch);
}
if (reader.IsStartElement("textsearchbook"))
{
currentTextSearch.Add(books[reader.GetAttribute("itemid")]);
}
#endregion
#region begin reading a new similarity search into the primary cache
if (reader.IsStartElement("similaritysearch"))
{
currentSimilaritySearch = new List<Book>();
similaritySearches.Add(reader.GetAttribute("similaritytext"), currentSimilaritySearch);
}
if (reader.IsStartElement("similaritysearchbook"))
{
currentSimilaritySearch.Add(books[reader.GetAttribute("itemid")]);
}
#endregion
}
}
}
}
}
private void AddBooks(Book[] books)
{
foreach (Book book in books)
{
if (!_books.ContainsKey(book.ItemID))
{
_books.Add(book.ItemID, book);
}
}
}