private static Results MatchMultiProcessor(string userAgent, Handler 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;
}
internal Request(string userAgent, Handler handler, AutoResetEvent completeEvent)
{
_userAgent = userAgent;
_queue = CreateQueue(handler);
_handler = handler;
_completeEvent = completeEvent;
}
private static Results MatchSingleProcessor(string userAgent, Handler handler)
{
// Create a single matcher and start it.
Request request = new Request(userAgent, handler);
// Process the request.
ServiceRequest(request);
// Return the results.
return request.Results;
}
/// <summary>
/// Returns the closest match to the userAgent string from the queue of
/// possible values.
/// </summary>
/// <param name="userAgent">userAgent being matched</param>
/// <param name="handler">the handler associated with the matching request</param>
/// <returns>best match userAgent</returns>
internal static Results Match(string userAgent, Handler handler)
{
if (Environment.ProcessorCount > 1 &&
Detection.Constants.ForceSingleProcessor == false)
{
return MatchMultiProcessor(userAgent, handler);
}
else
{
return MatchSingleProcessor(userAgent, handler);
}
}
/// <summary>
/// Uses a reduced initial string matching routine to determine the results.
/// </summary>
/// <param name="userAgent">The useragent to be matched.</param>
/// <param name="handler">The handler performing the match.</param>
/// <param name="tolerance">The number of characters that need to be the same at the begining of the string for a match to have occurred.</param>
/// <returns>All the devices that matched.</returns>
internal static Results Match(string userAgent, Handler handler, int tolerance)
{
BaseDeviceInfo bestMatch = null;
int maxInitialString = 0;
lock (handler.Devices)
{
foreach (var devices in handler.Devices.Values)
{
foreach (BaseDeviceInfo device in devices)
{
Check(userAgent, ref bestMatch, ref maxInitialString, device);
}
}
}
return maxInitialString >= tolerance ? new Results(bestMatch) : null;
}
/// <summary>
/// Adds the handler to the list of handlers if the handler's confidence
/// is higher than or equal to the current highest handler confidence.
/// </summary>
/// <param name="highestConfidence">Highest confidence value to far.</param>
/// <param name="handlers">List of handlers.</param>
/// <param name="handler">Handler to be considered for adding.</param>
/// <returns>The new highest confidence value.</returns>
private static void GetHandlers(ref byte highestConfidence, List<Handler> handlers, Handler handler)
{
if (handler.Confidence > highestConfidence)
{
handlers.Clear();
handlers.Add(handler);
highestConfidence = handler.Confidence;
}
else if (handler.Confidence == highestConfidence)
handlers.Add(handler);
}
/// <summary>
/// Processes the current handler and adds it to the list of handlers.
/// </summary>
/// <param name="handlers">The list of all handers to be added to.</param>
/// <param name="handler">The current handler object.</param>
/// <param name="reader">The XML stream reader.</param>
private static void ProcessHandler(List<Handler> handlers, Handler handler, XmlReader reader)
{
while (reader.Read())
{
if (reader.Depth > 0 && reader.IsStartElement())
{
switch (reader.Name)
{
case "canHandle":
handler.CanHandleRegex.AddRange(ProcessRegex(reader.ReadSubtree()));
break;
case "cantHandle":
handler.CantHandleRegex.AddRange(ProcessRegex(reader.ReadSubtree()));
break;
case "regexSegments":
if (handler is RegexSegmentHandler)
ProcessRegexSegments((RegexSegmentHandler)handler, reader.ReadSubtree());
break;
}
}
}
handlers.Add(handler);
}
internal Request(string userAgent, Handler handler)
{
_userAgent = userAgent;
_queue = CreateQueue(handler);
_handler = handler;
}
/// <summary>
/// Takes a handler and returns a queue containing the userAgent strings. Ensures a
/// lock is obtained on the handler before creating the queue to avoid another thread
/// accessing or changing content at the same time.
/// </summary>
/// <param name="handler">Handler containing devices.</param>
/// <returns>A queue of devices.</returns>
private static Queue<BaseDeviceInfo> CreateQueue(Handler handler)
{
Queue<BaseDeviceInfo> queue = new Queue<BaseDeviceInfo>(handler.Devices.Count);
lock (handler.Devices)
{
foreach (var devices in handler.Devices.Values)
{
foreach (BaseDeviceInfo device in devices)
{
queue.Enqueue(device);
}
}
}
return queue;
}
internal Request(string userAgent, Handler handler, AutoResetEvent completeEvent) :
base(userAgent, handler, completeEvent)
{
_results = new Results();
}
internal Request(string userAgent, Handler handler) :
base(userAgent, handler)
{
_results = new Results();
}