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 weight, difference;
Segments compare;
DeviceInfo current = request.Next();
while (current != null)
{
compare = request.Handler.CreateSegments(current.UserAgent);
difference = request.Target.Count - compare.Count;
for (int i = 0; i < difference; i++)
compare.Add(new Segment(String.Empty));
for (int i = 0; i < request.Target.Count; i++)
{
weight = request.Handler.GetSegmentWeight(i, request.Target.Count);
// If the two segments are exactly equal score as zero.
if (request.Target[i].Value == compare[i].Value)
compare[i].Score = 0;
// Otherwise assign the EditDistance value multiplied by the
// segment weight or if one is not available the index of the segment.
else
{
compare[i].Score = Algorithms.EditDistance(
request.Target[i].Value,
compare[i].Value,
int.MaxValue)*weight;
}
}
int totalScore = compare.TotalScore;
if (totalScore <= request.Results.LowestScore)
{
lock (request.Results)
{
if (totalScore == request.Results.LowestScore)
{
request.Results.Add(current);
}
else if (totalScore < request.Results.LowestScore)
{
request.Results.LowestScore = totalScore;
request.Results.Clear();
request.Results.Add(current);
}
}
}
current = request.Next();
request.Complete();
}
}