public void Run()
{
while (open)
{
if (parent.CanSend())
{
if (messages.TryDequeue(out IMessage delayed))
{
backoff.Reset();
parent.Send(delayed);
}
else
{
backoff.Now();
}
}
else
{
backoff.Now();
}
}
}
private void PerformExtraction()
{
try
{
events.Enqueue(new EventLoggerEntry(CWLoggerEntryType.Info, DateTime.Now, "CrawlWave Word Extraction Plugin thread has started with ID 0x" + Thread.CurrentThread.GetHashCode().ToString("x4")));
//the user may have enabled database just before starting the plugin
if (settings.UseDatabase)
{
if (dbcon == null)
{
dbProvider = DBConnectionStringProvider.Instance();
settings.DBConnectionString = dbProvider.ProvideDBConnectionString(name);
dbcon = new SqlConnection(settings.DBConnectionString);
}
}
while (!mustStop)
{
//Select a page from the database, perform word extraction and store the
//results back in the database
int UrlID = 0;
string data = String.Empty;
int waitSeconds = 0;
SelectUrlForWordExtraction(out UrlID, out data);
if (UrlID != 0)
{
try
{
backoff.Reset();
SortedList words = wordExtractor.ExtractWords(data);
if (words.Count != 0)
{
//add all the words to the database if they don't exist already
string word = String.Empty;
short word_count = 0;
int word_id = -1;
foreach (DictionaryEntry de in words)
{
word = (string)de.Key;
cache.AddStemmedWord(word);
}
//remove all the old words related to this url from the database
RemoveUrlWords(UrlID);
//now add relationships between the url and its words
foreach (DictionaryEntry d in words)
{
word = (string)d.Key;
word_count = (short)((int)d.Value);
word_id = cache[word];
AddUrlWord(UrlID, word_id, word_count);
}
}
UpdateUrlDataLastProcess(UrlID);
}
catch (Exception e)
{
events.Enqueue(new EventLoggerEntry(CWLoggerEntryType.Warning, DateTime.Now, "WordExtractionPlugin failed to extract words from Url with ID " + UrlID.ToString() + ": " + e.ToString()));
continue;
}
}
else
{
waitSeconds = backoff.Next() / 1000;
for (int i = 0; i < waitSeconds; i++)
{
Thread.Sleep(1000);
if (mustStop)
{
break;
}
}
}
Report();
if (settings.PauseBetweenOperations)
{
waitSeconds = PauseInSeconds();
for (int i = 0; i < waitSeconds; i++)
{
Thread.Sleep(1000);
if (mustStop)
{
break;
}
}
}
}
}
catch (ThreadAbortException)
{
//The thread was asked to abort, which means it must return at once
return;
}
catch (ThreadInterruptedException)
{
//The thread has been asked to Join. We have nothing to do but return.
return;
}
finally
{
events.Enqueue(new EventLoggerEntry(CWLoggerEntryType.Info, DateTime.Now, Thread.CurrentThread.Name + " has stopped."));
}
}