internal UdpChannelListener(UdpTransportBindingElement udpTransportBindingElement, BindingContext context)
: base(context.Binding)
{
Fx.Assert(udpTransportBindingElement != null, "udpTransportBindingElement can't be null");
Fx.Assert(context != null, "BindingContext parameter can't be null");
this.udpTransportBindingElement = udpTransportBindingElement;
this.cleanedUp = 0;
this.duplicateDetector = null;
if (udpTransportBindingElement.DuplicateMessageHistoryLength > 0)
{
this.duplicateDetector = new DuplicateMessageDetector(udpTransportBindingElement.DuplicateMessageHistoryLength);
}
this.onChannelClosed = new EventHandler(OnChannelClosed);
// We should only throw this exception if the user specified realistic MaxReceivedMessageSize less than or equal to max message size over UDP.
// If the user specified something bigger like Long.MaxValue, we shouldn't stop them.
if (this.udpTransportBindingElement.MaxReceivedMessageSize <= UdpConstants.MaxMessageSizeOverIPv4 &&
this.udpTransportBindingElement.SocketReceiveBufferSize < this.udpTransportBindingElement.MaxReceivedMessageSize)
{
throw FxTrace.Exception.ArgumentOutOfRange("SocketReceiveBufferSize", this.udpTransportBindingElement.SocketReceiveBufferSize,
SR.Property1LessThanOrEqualToProperty2("MaxReceivedMessageSize", this.udpTransportBindingElement.MaxReceivedMessageSize,
"SocketReceiveBufferSize", this.udpTransportBindingElement.SocketReceiveBufferSize));
}
int maxBufferSize = (int)Math.Min(udpTransportBindingElement.MaxReceivedMessageSize, UdpConstants.MaxMessageSizeOverIPv4);
this.bufferManager = BufferManager.CreateBufferManager(udpTransportBindingElement.MaxBufferPoolSize, maxBufferSize);
this.messageEncoderFactory = UdpUtility.GetEncoder(context);
UdpUtility.ValidateDuplicateDetectionAndRetransmittionSupport(this.messageEncoderFactory, this.udpTransportBindingElement.RetransmissionSettings.Enabled, this.udpTransportBindingElement.DuplicateMessageHistoryLength > 0);
InitUri(context);
//Note: because we are binding the sockets in InitSockets, we can start receiving data immediately.
//If there is a delay between the Building of the listener and the call to Open, stale data could build up
//inside the Winsock buffer. We have decided that making sure the port is updated correctly in the listen uri
//(e.g. in the ListenUriMode.Unique case) before leaving the build step is more important than the
//potential for stale data.
InitSockets(context.ListenUriMode == ListenUriMode.Unique);
Fx.Assert(!this.listenUri.IsDefaultPort, "Listen Uri's port should never be the default port: " + this.listenUri);
}
public static Message DecodeMessage(DuplicateMessageDetector duplicateDetector, MessageEncoder encoder, BufferManager bufferManager, ArraySegment <byte> data, IPEndPoint remoteEndPoint, int interfaceIndex, bool ignoreSerializationException, out string messageHash)
{
Fx.Assert(data != null, "data can't be null");
Fx.Assert(remoteEndPoint != null, "remoteEndPoint can't be null");
Fx.Assert(encoder != null, "encoder can't be null");
Fx.Assert(bufferManager != null, "bufferManager can't be null");
Message message = null;
messageHash = null;
if (duplicateDetector == null || !duplicateDetector.IsDuplicate(data, out messageHash))
{
try
{
message = encoder.ReadMessage(data, bufferManager);
}
catch (XmlException error)
{
// Don't throw serialization exceptions when the channel supports Multicast
if (!ignoreSerializationException)
{
throw;
}
FxTrace.Exception.AsWarning(error);
}
if (message != null)
{
message.Properties.Add(RemoteEndpointMessageProperty.Name,
new RemoteEndpointMessageProperty(remoteEndPoint.Address.ToString(), remoteEndPoint.Port));
NetworkInterfaceMessageProperty networkInterfaceMessageProperty = new NetworkInterfaceMessageProperty(interfaceIndex);
networkInterfaceMessageProperty.AddTo(message);
}
}
return(message);
}
protected override void OnClosing()
{
if (this.channelInstance != null)
{
lock (ThisLock)
{
if (this.channelInstance != null)
{
if (this.channelInstance.TransferReceiveManagerOwnership(this.socketReceiveManager,
this.duplicateDetector))
{
//don't clean these objects up, they now belong to the channel instance
this.socketReceiveManager = null;
this.duplicateDetector = null;
this.bufferManager = null;
}
}
this.channelInstance = null;
}
}
base.OnClosing();
}
// Since ChannelListener and channel lifetimes can be different, we need a
// way to transfer the socketReceiveManager and DuplicateMessageDetection
// objects to the channel if the listener gets closed. If this method succeeds, then
// this also indicates that the bufferManager is no longer owned by the channel listener,
// so we have to clean that up also.
internal bool TransferReceiveManagerOwnership(UdpSocketReceiveManager socketReceiveManager, DuplicateMessageDetector duplicateDetector)
{
bool success = false;
if (this.State == CommunicationState.Opened)
{
lock (ThisLock)
{
if (this.State == CommunicationState.Opened)
{
Fx.Assert(this.ReceiveManager == null, "ReceiveManager is already set to a non-null value");
Fx.Assert(this.DuplicateDetector == null, "DuplicateDetector is already set to a non-null value");
this.ReceiveManager = socketReceiveManager;
this.OwnsBufferManager = true;
this.ReceiveManager.SetReceiveHandler(this);
this.DuplicateDetector = duplicateDetector;
success = true;
}
}
}
return(success);
}
public static Message DecodeMessage(DuplicateMessageDetector duplicateDetector, MessageEncoder encoder, BufferManager bufferManager, ArraySegment<byte> data, IPEndPoint remoteEndPoint, int interfaceIndex, bool ignoreSerializationException, out string messageHash)
{
Fx.Assert(data != null, "data can't be null");
Fx.Assert(remoteEndPoint != null, "remoteEndPoint can't be null");
Fx.Assert(encoder != null, "encoder can't be null");
Fx.Assert(bufferManager != null, "bufferManager can't be null");
Message message = null;
messageHash = null;
if (duplicateDetector == null || !duplicateDetector.IsDuplicate(data, out messageHash))
{
try
{
message = encoder.ReadMessage(data, bufferManager);
}
catch (XmlException error)
{
// Don't throw serialization exceptions when the channel supports Multicast
if (!ignoreSerializationException)
{
throw;
}
FxTrace.Exception.AsWarning(error);
}
if (message != null)
{
message.Properties.Add(RemoteEndpointMessageProperty.Name,
new RemoteEndpointMessageProperty(remoteEndPoint.Address.ToString(), remoteEndPoint.Port));
NetworkInterfaceMessageProperty networkInterfaceMessageProperty = new NetworkInterfaceMessageProperty(interfaceIndex);
networkInterfaceMessageProperty.AddTo(message);
}
}
return message;
}