private void refreshDatabase(PageReadData data, bool notified = false, int revID = -1)
{
using (UserDataEntities dc = new UserDataEntities())
{
var currentPage = from page in dc.Pages
where page.Id == data.PageId
select page;
try
{
var page = currentPage.First();
if (notified)
{
// If user has been notified
page.LastRevision = revID;
page.LastNotified = DateTime.Now;
}
page.LastRefreshed = DateTime.Now;
dc.SaveChanges();
}
catch (ArgumentNullException exp)
{
Console.WriteLine("Error: " + exp.Message + "\n\t Possibly wrong page id.");
}
}
}
private void sendEmail(PageReadData data)
{
EmailSender emailSender = new EmailSender();
emailSender.sendEmail(data.Email, data.UserName, data.WikiPage + " Wikipedia page has been changed",
"Dear " + data.UserName + "!\n\n" +
"A wikipedia page followed by you has been changed:\n" +
"https://en.wikipedia.org/wiki/" + data.WikiPage + "\n\n\n" +
"Regards,\n" +
"The Wikipedia Follower Team"
);
Console.WriteLine("Email has been sent to " + data.Email);
}
private void checkAndUpdateWikiPage(PageReadData data)
{
// First check revID
WikiAPI api = new WikiAPI();
var revIDs = api.GetRevisions(data.WikiPage, data.LastRevision).OrderBy(x => x.RevId).ToList();
if (revIDs.Count <= 1)
{
// No newer revID
return;
}
var currentRevID = revIDs.Last().RevId;
if (data.LastRevision == -1)
{
// First check send email
sendEmail(data);
refreshDatabase(data, true, currentRevID);
return;
}
string currentPageContent = api.GetContent(data.WikiPage, currentRevID);
string prevPageContent = api.GetContent(data.WikiPage, data.LastRevision);
MatchCollection words1 = Regex.Matches(currentPageContent, @"\b(\w+)\b");
MatchCollection words2 = Regex.Matches(prevPageContent, @"\b(\w+)\b");
var hs1 = new HashSet <string>(words1.Cast <Match>().Select(m => m.Value));
var hs2 = new HashSet <string>(words2.Cast <Match>().Select(m => m.Value));
var hs1_mod = new HashSet <string>(hs1);
var hs2_mod = new HashSet <string>(hs2);
hs2_mod.ExceptWith(hs1);
int prevVersionExtraWordCounter = hs2_mod.Count;
hs1_mod.ExceptWith(hs2);
int newVersionExtraWordCounter = hs1_mod.Count;
// Calculate diff, if bigger then sensititvity, then send email
if (newVersionExtraWordCounter + prevVersionExtraWordCounter > data.Sensitivity)
{
sendEmail(data);
refreshDatabase(data, true, currentRevID);
}
else
{
refreshDatabase(data);
}
}