/// <summary cref="CommunicationObject.OnBeginOpen" />
protected override IAsyncResult OnBeginOpen(TimeSpan timeout, AsyncCallback callback, object state)
{
TcpAsyncOperation <int> operation = new TcpAsyncOperation <int>(Int32.MaxValue, callback, state);
operation.Complete(0);
return(operation);
}
/// <summary>
/// Closes the listener.
/// </summary>
private void InternalClose(object state)
{
TcpAsyncOperation <int> operation = (TcpAsyncOperation <int>)state;
try
{
lock (m_lock)
{
while (m_channelQueue.Count > 0)
{
UaTcpReplyChannel channel = m_channelQueue.Dequeue();
channel.Abort();
}
while (m_acceptQueue.Count > 0)
{
TcpAsyncOperation <IReplySessionChannel> waitingAccept = m_acceptQueue.Dequeue();
waitingAccept.Fault(StatusCodes.BadServerHalted);
}
Stop();
}
operation.Complete(0);
}
catch (Exception e)
{
operation.Fault(e, StatusCodes.BadInternalError, "Could not close UA TCP listener.");
}
}
/// <summary cref="IReplyChannel.BeginTryReceiveRequest" />
public IAsyncResult BeginTryReceiveRequest(TimeSpan timeout, AsyncCallback callback, object state)
{
ThrowIfDisposedOrNotOpen();
try
{
TcpAsyncOperation <RequestContext> operation = new TcpAsyncOperation <RequestContext>(Utils.GetTimeout(timeout), callback, state);
lock (m_lock)
{
if (m_requestQueue.Count > 0)
{
RequestContext request = m_requestQueue.Dequeue();;
// Utils.Trace("Request Accepted (S): ChannelId={0}, RequestId={1}", this.m_channel.Id, request.RequestId);
operation.Complete(request);
return(operation);
}
m_operationQueue.Enqueue(operation);
}
return(operation);
}
catch (Exception e)
{
Utils.Trace(e, "BeginTryReceiveRequest Error");
throw;
}
}
/// <summary>
/// Cancels all outstanding requests.
/// </summary>
private void InternalClose(object state)
{
TcpAsyncOperation <int> operation = (TcpAsyncOperation <int>)state;
try
{
lock (m_lock)
{
while (m_requestQueue.Count > 0)
{
RequestContext context = m_requestQueue.Dequeue();;
// Utils.Trace("Request Aborted: ChannelId={0}, RequestId={1}", this.m_channel.Id, context.RequestId);
context.Abort();
}
while (m_operationQueue.Count > 0)
{
TcpAsyncOperation <RequestContext> receiveOperation = m_operationQueue.Dequeue();
receiveOperation.Complete(null);
}
}
operation.Complete(0);
}
catch (Exception e)
{
operation.Fault(e, StatusCodes.BadInternalError, "Could not close a UA TCP reply channel.");
}
}
/// <summary cref="CommunicationObject.OnAbort" />
protected override void OnAbort()
{
try
{
lock (m_lock)
{
while (m_requestQueue.Count > 0)
{
RequestContext context = m_requestQueue.Dequeue();
// Utils.Trace("Request Aborted: ChannelId={0}, RequestId={1}", this.m_channel.Id, context.RequestId);
context.Abort();
}
while (m_operationQueue.Count > 0)
{
TcpAsyncOperation <RequestContext> receiveOperation = m_operationQueue.Dequeue();
receiveOperation.Complete(null);
}
}
}
catch (Exception)
{
// ignore exceptions on abort.
}
}
/// <summary>
/// Handles requests arriving from a channel.
/// </summary>
private void OnRequestReceived(TcpServerChannel channel, uint requestId, IServiceRequest request)
{
RequestContext context = null;
lock (m_lock)
{
// create message.
Message message = Message.CreateMessage(
MessageVersion.Soap12WSAddressing10,
Namespaces.OpcUaWsdl + "/InvokeService",
new InvokeServiceBodyWriter(null, true));
string messageId = Utils.Format("urn:uuid:{0}", Guid.NewGuid());
// update headers.
message.Headers.To = m_address.Uri;
message.Headers.MessageId = new UniqueId(messageId);
// add the raw object to the message properties.
message.Properties.Add(MessageProperties.UnencodedBody, request);
// create request.
context = new RequestContext(channel, requestId, message, request);
// Utils.Trace("Request Received: ChannelId={0}, RequestId={1}, RequestType={2}", this.m_channel.Id, requestId, request.BinaryEncodingId);
}
// notify any waiting threads.
bool received = false;
do
{
TcpAsyncOperation <RequestContext> operation = null;
lock (m_lock)
{
if (m_operationQueue.Count == 0)
{
m_requestQueue.Enqueue(context);
break;
}
// Utils.Trace("Request Accepted (A): ChannelId={0}, RequestId={1}", this.m_channel.Id, requestId);
operation = m_operationQueue.Dequeue();
}
try
{
received = operation.Complete(true, context);
}
catch (Exception e)
{
Utils.Trace(e, "Error receiving request");
received = false;
}
}while (!received);
}
/// <summary>
/// Closes the channel.
/// </summary>
private void InternalClose(object state)
{
TcpAsyncOperation <int> operation = (TcpAsyncOperation <int>)state;
try
{
InternalClose(Int32.MaxValue);
operation.Complete(0);
}
catch (Exception e)
{
operation.Fault(e, StatusCodes.BadInternalError, "Could not close UA TCP request channel.");
}
}
/// <summary>
/// Opens the listener.
/// </summary>
private void InternalOpen(object state)
{
TcpAsyncOperation <int> operation = (TcpAsyncOperation <int>)state;
try
{
lock (m_lock)
{
Start();
}
operation.Complete(0);
}
catch (Exception e)
{
operation.Fault(e, StatusCodes.BadInternalError, "Could not start UA TCP listener.");
}
}
/// <summary cref="ChannelListenerBase{T}.OnBeginAcceptChannel" />
protected override IAsyncResult OnBeginAcceptChannel(TimeSpan timeout, AsyncCallback callback, object state)
{
TcpAsyncOperation <IReplySessionChannel> operation = new TcpAsyncOperation <IReplySessionChannel>(Utils.GetTimeout(timeout), callback, state);
lock (m_lock)
{
if (m_channelQueue.Count > 0)
{
UaTcpReplyChannel channel = m_channelQueue.Dequeue();
Utils.Trace("Channel Accepted: Id={0}", channel.Id);
operation.Complete(channel);
return(operation);
}
m_acceptQueue.Enqueue(operation);
}
return(operation);
}
/// <summary cref="System.ServiceModel.Channels.RequestContext.BeginReply(Message, TimeSpan, AsyncCallback, object)" />
public override IAsyncResult BeginReply(Message message, TimeSpan timeout, AsyncCallback callback, object state)
{
TcpAsyncOperation <uint> operation = new TcpAsyncOperation <uint>(Utils.GetTimeout(timeout), callback, state);
IServiceResponse response = null;
lock (m_lock)
{
if (m_channel != null)
{
response = (IServiceResponse)message.Properties[MessageProperties.UnencodedBody];
// Utils.Trace("Reply Sent: ChannelId={0}, RequestId={1}", this.m_channel.Id, m_requestId);
m_channel.SendResponse(m_requestId, response);
m_channel = null;
}
}
operation.Complete(StatusCodes.Good);
return(operation);
}
