/// <summary>
/// Start the UdpDiscovery process
/// </summary>
/// <param name="messageContext">The <see cref="IServiceMessageContext"/> object that should be used in encode/decode messages</param>
/// <returns></returns>
public virtual async Task StartAsync(IServiceMessageContext messageContext)
{
await Task.Run(() => {
lock (m_lock)
{
MessageContext = messageContext;
// initialize Discovery channels
m_discoveryUdpClients = UdpClientCreator.GetUdpClients(UsedInContext.Discovery, DiscoveryNetworkInterfaceName, DiscoveryNetworkAddressEndPoint);
}
}).ConfigureAwait(false);
}
/// <summary>
/// Perform specific Start tasks
/// </summary>
protected override Task InternalStart()
{
lock (m_lock)
{
//cleanup all existing UdpClient previously open
InternalStop();
NetworkAddressUrlDataType networkAddressUrlState = ExtensionObject.ToEncodeable(PubSubConnectionConfiguration.Address)
as NetworkAddressUrlDataType;
if (networkAddressUrlState == null)
{
Utils.Trace(Utils.TraceMasks.Error, "The configuration for connection {0} has invalid Address configuration.",
this.PubSubConnectionConfiguration.Name);
return(Task.FromResult <object>(null));
}
NetworkInterfaceName = networkAddressUrlState.NetworkInterface;
NetworkAddressEndPoint = UdpClientCreator.GetEndPoint(networkAddressUrlState.Url);
if (NetworkAddressEndPoint == null)
{
Utils.Trace(Utils.TraceMasks.Error, "The configuration for connection {0} with Url:'{1}' resulted in an invalid endpoint.",
this.PubSubConnectionConfiguration.Name, networkAddressUrlState.Url);
return(Task.FromResult <object>(null));
}
//publisher initialization
if (Publishers.Count > 0)
{
m_publisherUdpClients = UdpClientCreator.GetUdpClients(UsedInContext.Publisher, networkAddressUrlState, NetworkAddressEndPoint);
}
//subscriber initialization
if (GetAllDataSetReaders().Count > 0)
{
m_subscriberUdpClients = UdpClientCreator.GetUdpClients(UsedInContext.Subscriber, networkAddressUrlState, NetworkAddressEndPoint);
foreach (UdpClient subscriberUdpClient in m_subscriberUdpClients)
{
try
{
subscriberUdpClient.BeginReceive(new AsyncCallback(OnUadpReceive), subscriberUdpClient);
}
catch (Exception ex)
{
Utils.Trace(Utils.TraceMasks.Information, "UdpClient '{0}' Cannot receive data. Exception: {1}",
subscriberUdpClient.Client.LocalEndPoint, ex.Message);
}
}
}
}
return(Task.FromResult <object>(null));
}
/// <summary>
/// Perform specific Start tasks
/// </summary>
protected override async Task InternalStart()
{
//cleanup all existing UdpClient previously open
await InternalStop();
if (NetworkAddressEndPoint == null)
{
return;
}
//publisher initialization
if (Publishers.Count > 0)
{
lock (m_lock)
{
m_publisherUdpClients = UdpClientCreator.GetUdpClients(UsedInContext.Publisher, NetworkInterfaceName, NetworkAddressEndPoint);
}
m_udpDiscoveryPublisher = new UdpDiscoveryPublisher(this);
await m_udpDiscoveryPublisher.StartAsync(MessageContext);
}
//subscriber initialization
if (GetAllDataSetReaders().Count > 0)
{
lock (m_lock)
{
m_subscriberUdpClients = UdpClientCreator.GetUdpClients(UsedInContext.Subscriber, NetworkInterfaceName, NetworkAddressEndPoint);
foreach (UdpClient subscriberUdpClient in m_subscriberUdpClients)
{
try
{
subscriberUdpClient.BeginReceive(new AsyncCallback(OnUadpReceive), subscriberUdpClient);
}
catch (Exception ex)
{
Utils.Trace(Utils.TraceMasks.Information, "UdpClient '{0}' Cannot receive data. Exception: {1}",
subscriberUdpClient.Client.LocalEndPoint, ex.Message);
}
}
}
// initialize the discovery channel
m_udpDiscoverySubscriber = new UdpDiscoverySubscriber(this);
await m_udpDiscoverySubscriber.StartAsync(MessageContext);
// add handler to metaDataReceived event
this.Application.MetaDataReceived += Application_MetaDataReceived;
}
}
