Windows Azure: Service Bus Relay

Service Host:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.ServiceModel;



namespace Test.WCF.ServiceBus.Host.Service

{

    [ServiceContract(Namespace = "urn:ps")]

    interface IProblemSolver

    {

        [OperationContract]

        int AddNumbers(int a, int b);

    }



    interface IProblemSolverChannel : IProblemSolver, IClientChannel { }

}

IProblemSolver.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;



namespace Test.WCF.ServiceBus.Host.Service

{

    class ProblemSolver : IProblemSolver

    {

        public int AddNumbers(int a, int b)

        {

            return a + b;

        }

    }

}

ProblemSolver.cs

using Microsoft.ServiceBus;

using System;

using System.Collections.Generic;

using System.Linq;

using System.ServiceModel;

using System.Text;

using System.Threading.Tasks;

using Test.WCF.ServiceBus.Host.Service;



namespace Test.WCF.ServiceBus.Host

{

    class Program

    {

        static void Main(string[] args)

        {

            ServiceHost sh = new ServiceHost(typeof(ProblemSolver));



            sh.AddServiceEndpoint(

               typeof(IProblemSolver), new NetTcpBinding(),

               "net.tcp://localhost:9358/***Relay Name***");



            sh.AddServiceEndpoint(

               typeof(IProblemSolver), new NetTcpRelayBinding(),

               ServiceBusEnvironment.CreateServiceUri("sb", "***Service Bus Name***", "***Relay Name***"))

                .Behaviors.Add(new TransportClientEndpointBehavior

                {

                    TokenProvider = TokenProvider.CreateSharedSecretTokenProvider("owner", "***Service Bus Token***")

                });



            sh.Open();



            Console.WriteLine("Press ENTER to close");

            Console.ReadLine();



            sh.Close();

        }

    }

}

Program.cs

 

Service Client:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.ServiceModel;



namespace Test.WCF.ServiceBus.Client

{

    [ServiceContract(Namespace = "urn:ps")]

    interface IProblemSolver

    {

        [OperationContract]

        int AddNumbers(int a, int b);

    }



    interface IProblemSolverChannel : IProblemSolver, IClientChannel { }

}

IProblemSolver.cs

using Microsoft.ServiceBus;

using System;

using System.Collections.Generic;

using System.Linq;

using System.ServiceModel;

using System.Text;

using System.Threading.Tasks;



namespace Test.WCF.ServiceBus.Client

{

    class Program

    {

        public static ChannelFactory<IMediaServicesManagementServiceChannel> testCF=null;

        static void Main(string[] args)

        {



            Retry(

                () =>

                {

                    bool flag = false;

                    var cf = new ChannelFactory<IMediaServicesManagementServiceChannel>(

                                   new NetTcpRelayBinding(),

                                   new EndpointAddress(ServiceBusEnvironment.CreateServiceUri("sb", "***Service Bus Name***", "***Relay Name***")));



                    cf.Endpoint.Behaviors.Add(new TransportClientEndpointBehavior { TokenProvider = TokenProvider.CreateSharedSecretTokenProvider("owner", "***Service Bus Token***") });



         

                    var ch1 = cf.CreateChannel();



                    try

                    {

                        Console.WriteLine(ch1.AddNumbers(3, 4));

                        flag = true;

                    }

                    catch

                    {

                        ch1.Abort();

                        flag = false;

                    }

                    finally

                    {

                        if (ch1 != null)

                        {

                            ch1.Close();

                        }

                    }

                    return flag;

                },

                5);

            





            Console.WriteLine("Press ENTER to close");

            Console.ReadLine();

        }



        public static void Retry(Func<bool> task, int times)

        {

            bool flag = false;

            

            for (int i = 0; i < times; i++ )

            {

                flag = task();

                

                if(flag==true)

                {

                    break;

                }

            }

        }





    }

}

Program.cs

这里在client端加入了Retry的逻辑以用于由于网络不稳定或其他原因造成的Host Service Faulted State的情形。

同时要注意，WCF创建的Channel是Fault State时，在调用.Close()之前, 要先调用.Abort().

Reference Links:

http://jeffbarnes.net/blog/post/2007/04/24/wcf-your-proxy-can-only-fault-once.aspx

http://blog.tallan.com/2009/05/06/recover-from-a-wcf-service-fault/