public bool OrderItem(string bookID, string userID)
{
bookstoreProxy.EnlistPurchase(bookID, 1);
double price = bookstoreProxy.GetItemPrice(bookID);
if (price == -1)
{
return(false);
}
bankProxy.EnlistMoneyTransfer(userID, price);
tasks.Add(Task <bool> .Factory.StartNew(() => bookstoreProxy.Prepare()));
tasks.Add(Task <bool> .Factory.StartNew(() => bankProxy.Prepare()));
Task.WaitAll(tasks.ToArray());
if (tasks[0].Result && tasks[1].Result)
{
tasks.Clear();
tasks.Add(Task <bool> .Factory.StartNew(() => { bookstoreProxy.Commit(); return(true); }));
tasks.Add(Task <bool> .Factory.StartNew(() => { bankProxy.Commit(); return(true); }));
Task.WaitAll(tasks.ToArray());
return(true);
}
else
{
tasks.Add(Task <bool> .Factory.StartNew(() => { bookstoreProxy.Rollback(); return(true); }));
tasks.Add(Task <bool> .Factory.StartNew(() => { bankProxy.Rollback(); return(true); }));
Task.WaitAll(tasks.ToArray());
return(false);
}
}