private GoogleBookJsonResponse GetGoogleBookItem(string jsonGoogleBooksResponse)
{
DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(GoogleBookJsonResponse));
GoogleBookJsonResponse bookItem = null;
using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonGoogleBooksResponse)))
{
bookItem = (GoogleBookJsonResponse)jsonSerializer.ReadObject(ms);
}
return(bookItem);
}
private BookItem ChooseBookItem(GoogleBookJsonResponse booksDataFromGoogle, string bookName, string authorName)
{
BookItem bookItem = null;
foreach (BookItem item in booksDataFromGoogle.items)
{
if (PhrasesAreEqual(bookName, item.volumeInfo.title) && AuthorIsInList(authorName, item.volumeInfo.authors))
{
bookItem = item;
break;
}
}
return bookItem;
}
private BookItem ChooseBookItem(GoogleBookJsonResponse booksDataFromGoogle, string bookName, string authorName)
{
BookItem bookItem = null;
foreach (BookItem item in booksDataFromGoogle.items)
{
if (PhrasesAreEqual(bookName, item.volumeInfo.title) && AuthorIsInList(authorName, item.volumeInfo.authors))
{
bookItem = item;
break;
}
}
return(bookItem);
}
private GoogleBookJsonResponse GetBooksDataFromGoogle(string bookName, string author, int iterator)
{
string queryString = baseGoogleBooksUrl + " \"" + bookName + "\" " + author;
KnigoskopWebClient webClient = new KnigoskopWebClient();
try
{
string jsonGoogleBooksResponse = webClient.DownloadData(queryString);
GoogleBookJsonResponse bookItem = GetGoogleBookItem(jsonGoogleBooksResponse);
return(bookItem);
}
catch (WebException ex)
{
if (ex.Message.Contains("(403)"))
{
string currentTime = Convert.ToString(DateTime.Now);
Console.WriteLine(currentTime + " " + ex.Message);
Thread.Sleep((iterator + 1) * 5000);
if (iterator <= 10)
{
iterator++;
return(GetBooksDataFromGoogle(bookName, author, iterator));
}
else
{
throw ex;
}
}
else
{
throw ex;
}
}
catch (Exception ex)
{
throw ex;
}
}
private void GoThroughBookRecords()
{
using (Entities context = new Entities())
{
try
{
IQueryable <Guid> books = null;
if (!string.IsNullOrEmpty(orderByClause))
{
books = context.Books.AsNoTracking().Where(x => x.FromGoogleBooks == null || x.FromGoogleBooks == false).OrderBy(x => x.Name).Select(x => x.BookId);
}
else
{
books = context.Books.AsNoTracking().Where(x => x.FromGoogleBooks == null || x.FromGoogleBooks == false).OrderBy(x => x.BookId).Select(x => x.BookId);
}
foreach (var bookID in books)
{
Book book = context.Books.FirstOrDefault(x => x.BookId == bookID);
ApplicationLogger.WriteStringToLog("Start to process book: " + book.BookId.ToString());
try
{
GoogleBookJsonResponse booksDataFromGoogle = GetBooksDataFromGoogle(book.Name, book.Authors.FirstOrDefault().Name, 0);
if (booksDataFromGoogle != null && booksDataFromGoogle.totalItems > 0)
{
ApplicationLogger.WriteStringToLog("Processed book: " + book.BookId.ToString() + " - Success");
BookItem bookItem = ChooseBookItem(booksDataFromGoogle, book.Name, book.Authors.FirstOrDefault().Name);
if (bookItem != null)
{
UpdateBookRecord(context, book, bookItem);
context.SaveChanges();
}
else
{
UpdateBookRecordAsProcessed(context, book);
context.SaveChanges();
}
}
else
{
UpdateBookRecordAsProcessed(context, book);
context.SaveChanges();
}
}
catch
{
}
Thread.Sleep(2000);
}
}
catch (SqlException ex)
{
if (ex.Message.Contains("provider: TCP Provider, error: 0"))
{
string currentTime = Convert.ToString(DateTime.Now);
ApplicationLogger.WriteStringToLog("Error: can't connect to SQL server.");
Thread.Sleep(5000);
GoThroughBookRecords();
}
}
catch (Exception ex)
{
ApplicationLogger.WriteStringToLog(ex.Message);
throw ex;
}
}
}
