private static Results MatchMultiProcessor(string userAgent, SegmentHandler handler)
{
// Provide an object to signal when the request has completed.
AutoResetEvent waiter = new AutoResetEvent(false);
// Create the request.
Request request = new Request(userAgent, handler, waiter);
if (request.Count > 0)
{
// For each thread add this to the queue.
for (int i = 0; i < Environment.ProcessorCount; i++)
ThreadPool.QueueUserWorkItem(ServiceRequest, request);
// Wait until a signal is received. Keeping coming back to
// this thread so that a request to close the request
// can be processed.
while (waiter.WaitOne(1, false) == false)
{
// Do nothing
}
;
}
// Return the results.
return request.Results;
}
private static Results MatchSingleProcessor(string userAgent, SegmentHandler handler)
{
// Create a segment matcher request.
Request request = new Request(userAgent, handler);
// Process the request.
ServiceRequest(request);
// Return the results.
return request.Results;
}
private static void ServiceRequest(Request request)
{
int index;
uint runningScore, score;
BaseDeviceInfo current = request.Next();
while (current != null)
{
// Reset the counters.
runningScore = 0;
index = 0;
while (index < request.Target.Count &&
runningScore <= request.Results.LowestScore)
{
// Get the next segment for the comparision.
var compare = request.Handler.CreateSegments(
current.UserAgent, index);
// If the two results are not equal in length so do not consider
// this useragent as a possible match.
if (request.Target[index].Count != compare.Count)
{
runningScore = uint.MaxValue;
break;
}
// Work out the score for each of the returned segments.
for (int segmentIndex = 0;
segmentIndex < request.Target[index].Count;
segmentIndex++)
{
// If the two are equal then set to zero.
if (request.Target[index][segmentIndex].Value == compare[segmentIndex].Value)
score = 0;
else
score = (uint)Algorithms.EditDistance(
request.Target[index][segmentIndex].Value,
compare[segmentIndex].Value,
int.MaxValue) *
(uint)request.Target[index][segmentIndex].Weight;
// Update the counters.
compare[segmentIndex].Score = score;
runningScore += score;
}
index++;
}
if (runningScore <= request.Results.LowestScore)
{
lock (request.Results)
{
if (runningScore == request.Results.LowestScore)
{
request.Results.Add(current);
}
else if (runningScore < request.Results.LowestScore)
{
request.Results.LowestScore = runningScore;
request.Results.Clear();
request.Results.Add(current);
}
}
}
current = request.Next();
request.Complete();
}
}
