private void Evaluate(Chromosome chromosome)
{
SocketPoolItem socketPoolItem = null;
try {
//Get a connected socket from the socket collection. As this is a blocking collection
//wrapping a concurrent queue, then '_sockets.Take()' will remove the next item (Socket)
//from the queue. If nothing is on the queue the task will wait (block). This is by
//design as the task(s) that call this method (one worker per endpoint) are defined
//as long running tasks.
//use the connected socket and then pop it back on the queue.
//this ensures that only unused sockets are selected.
socketPoolItem = _socketPool.Dequeue();
Log.Debug(string.Format("SocketPoolItem: {0} retrieved from the pool.", socketPoolItem.EndPoint));
//if not connected, attempt to reconnect
if (!socketPoolItem.Socket.Connected)
{
Log.Debug(string.Format("SocketPoolItem: {0} not connected, attempting to re-connect.", socketPoolItem.EndPoint));
socketPoolItem = new SocketPoolItem(
SocketClient.Connect(socketPoolItem.EndPoint), socketPoolItem.EndPoint);
}
else
{
Log.Debug(string.Format("SocketPoolItem: {0} connected.", socketPoolItem.EndPoint));
}
//pass the socket to the fitness function using the tag property
chromosome.Tag = socketPoolItem;
chromosome.Evaluate(RemoteFitnessDelegateFunction);
} catch (Exception ex) {
if (socketPoolItem != null && socketPoolItem.Socket != null && socketPoolItem.EndPoint != null)
{
Log.Error(string.Format("{0} [Socket:{1}]", ex.Message, socketPoolItem.EndPoint));
}
else
{
Log.Error(ex);
}
var task = _pcQueue.Enqueue(() => Evaluate(chromosome));
Log.Debug(string.Format("Chromosome [{0}] evaluation re-queued as Task {1} queued.", chromosome.Id, task.Id));
throw;
} finally {
//finished with the endpoint so pop it back in the list to be used by this or another worker
_socketPool.Enqueue(socketPoolItem);
}
}