protected virtual void Serve(LampRequest request)
{
var record = GetLampDb(request.Id);
var client = new LampClient(record);
record.ProcessStateChanges(request.Data);
client.SetState().Wait(); // Synchronously set the state. It may throw an exception
UpdateLampDb(record);
}
public void Schedule(LampRequest request)
{
lock (_queue) _queue.Enqueue(request);
// Is there already a task running to service the request?
bool noThread = _mutex.WaitOne(0);
if (noThread)
{
Task.Run(() => ServiceRequests());
_mutex.ReleaseMutex();
}
}
protected void ServiceRequests()
{
// Obtain Mutex to indicate that we are servicing requests
_mutex.WaitOne();
LampRequest request = null;
try
{
while (true)
{
// Seems like infinite loop, but empty queue will throw exception
lock (_queue) request = _queue.Dequeue();
Serve(request);
// If there are more requests, sneak in a little delay to make sure the lamps can keep up
_queue.Peek();
// If code made it here without exception, there is another item
Thread.Sleep(200);
}
}
catch (InvalidOperationException)
{
// Queue is empty, this is fine. This thread will end.
}
catch (Exception ex)
{
// Error processing request
Logger.LogError("Error processing request {0}, Exception {1} Message {2}", request, ex.GetType().Name, ex.Message);
}
finally
{
// Release Mutex to let new thread be started
_mutex.ReleaseMutex();
}
}