/// <summary>
/// Tells the server that the client is ready to receive notifications from the server.
/// </summary>
public PublishResponseMessage Publish(PublishMessage request)
{
try
{
// validate the sesion
Session session = VerifySession(request.RequestHeader, false);
uint subscriptionId = 0;
NotificationMessage message = null;
QueuedRequest queuedRequest = new QueuedRequest();
lock (m_messages)
{
// first check if there are any messages waiting to be published.
for (LinkedListNode<QueuedMessage> node = m_messages.First; node != null; node = node.Next)
{
// ensure the message belongs to the current session
if (Object.ReferenceEquals(session, node.Value.Session))
{
// pull the message off the queue and return.
subscriptionId = node.Value.Subscription.Id;
message = node.Value.Message;
m_messages.Remove(node);
break;
}
}
// must process requests in the order that they arrive.
if (message == null)
{
queuedRequest.Session = session;
queuedRequest.Timeout = DateTime.UtcNow.AddMilliseconds(request.RequestHeader.TimeoutHint);
queuedRequest.Signal = new ManualResetEvent(false);
m_requests.AddLast(queuedRequest);
}
}
// wait for a notification.
if (message == null)
{
try
{
queuedRequest.Signal.WaitOne();
if (queuedRequest.Message == null)
{
throw new StatusCodeException(StatusCodes.BadTimeout, "Timed out waiting for notifications.");
}
subscriptionId = queuedRequest.SubscriptionId;
message = queuedRequest.Message;
}
finally
{
queuedRequest.Signal.Close();
}
}
// sent response.
PublishResponseMessage response = new PublishResponseMessage();
response.ResponseHeader = CreateResponseHeader(request.RequestHeader);
response.SubscriptionId = subscriptionId;
response.NotificationMessage = message;
response.MoreNotifications = false;
response.Results = new ListOfStatusCode();
response.DiagnosticInfos = new ListOfDiagnosticInfo();
response.AvailableSequenceNumbers = new ListOfUInt32();
return response;
}
catch (Exception e)
{
throw CreateSoapFault(request.RequestHeader, e);
}
}
