Procedimiento para implementar un servicio reconocible que se registra con el proxy de detección

Artículo
06/10/2024

Este tema es el segundo de cuatro temas que describe cómo implementar un proxy de detección. En el tema anterior, Procedimiento para implementar un proxy de detección, se implementó un proxy de detección. En este tema, se crea un servicio WCF que envía mensajes de anuncio (Hello y Bye) al proxy de detección, lo que hace que se registre y anule el registro con el proxy de detección.

Para definir el contrato de servicio

Agregue un nuevo proyecto de aplicación de consola a la solución DiscoveryProxyExample denominada Service.
Agregue referencias a los siguientes ensamblados:
1. System.ServiceModel
2. System.ServiceModel.Discovery
Agregue una nueva clase al proyecto CalculatorService.

Añade las siguientes directivas using.

using System;
using System.ServiceModel;

Dentro de CalculatorService.cs, defina el contrato de servicios.

// Define a service contract.
[ServiceContract(Namespace = "http://Microsoft.Samples.Discovery")]
public interface ICalculatorService
{
    [OperationContract]
    double Add(double n1, double n2);
    [OperationContract]
    double Subtract(double n1, double n2);
    [OperationContract]
    double Multiply(double n1, double n2);
    [OperationContract]
    double Divide(double n1, double n2);
}

También dentro de CalculatorService.cs, implemente el contrato de servicios.

// Service class which implements the service contract.
public class CalculatorService : ICalculatorService
{
    public double Add(double n1, double n2)
    {
        double result = n1 + n2;
        Console.WriteLine("Received Add({0},{1})", n1, n2);
        Console.WriteLine("Return: {0}", result);
        return result;
    }

    public double Subtract(double n1, double n2)
    {
        double result = n1 - n2;
        Console.WriteLine("Received Subtract({0},{1})", n1, n2);
        Console.WriteLine("Return: {0}", result);
        return result;
    }

    public double Multiply(double n1, double n2)
    {
        double result = n1 * n2;
        Console.WriteLine("Received Multiply({0},{1})", n1, n2);
        Console.WriteLine("Return: {0}", result);
        return result;
    }

    public double Divide(double n1, double n2)
    {
        double result = n1 / n2;
        Console.WriteLine("Received Divide({0},{1})", n1, n2);
        Console.WriteLine("Return: {0}", result);
        return result;
    }
}

Para hospedar el servicio

Abra el archivo Program.cs que se generó cuando creó el proyecto.

Añade las siguientes directivas using.

using System;
using System.ServiceModel;
using System.ServiceModel.Description;
using System.ServiceModel.Discovery;

Agregue el código siguiente en el método Main():

// Define the base address of the service
Uri baseAddress = new Uri("net.tcp://localhost:9002/CalculatorService/" + Guid.NewGuid().ToString());
// Define the endpoint address where announcement messages will be sent
Uri announcementEndpointAddress = new Uri("net.tcp://localhost:9021/Announcement");

// Create the service host
ServiceHost serviceHost = new ServiceHost(typeof(CalculatorService), baseAddress);
try
{
    // Add a service endpoint
    ServiceEndpoint netTcpEndpoint = serviceHost.AddServiceEndpoint(typeof(ICalculatorService),
        new NetTcpBinding(), string.Empty);

    // Create an announcement endpoint, which points to the Announcement Endpoint hosted by the proxy service.
    AnnouncementEndpoint announcementEndpoint = new AnnouncementEndpoint(new NetTcpBinding(),
        new EndpointAddress(announcementEndpointAddress));

    // Create a ServiceDiscoveryBehavior and add the announcement endpoint
    ServiceDiscoveryBehavior serviceDiscoveryBehavior = new ServiceDiscoveryBehavior();
    serviceDiscoveryBehavior.AnnouncementEndpoints.Add(announcementEndpoint);

    // Add the ServiceDiscoveryBehavior to the service host to make the service discoverable
    serviceHost.Description.Behaviors.Add(serviceDiscoveryBehavior);

    // Start listening for messages
    serviceHost.Open();

    Console.WriteLine("Calculator Service started at {0}", baseAddress);
    Console.WriteLine();
    Console.WriteLine("Press <ENTER> to terminate the service.");
    Console.WriteLine();
    Console.ReadLine();

    serviceHost.Close();
}
catch (CommunicationException e)
{
    Console.WriteLine(e.Message);
}
catch (TimeoutException e)
{
    Console.WriteLine(e.Message);
}

if (serviceHost.State != CommunicationState.Closed)
{
    Console.WriteLine("Aborting the service...");
    serviceHost.Abort();
}

Ha completado la implementación de un servicio que se puede detectar. Continúe con el Procedimiento para implementar una aplicación cliente que usa el proxy de detección para buscar un servicio.

Ejemplo

Esta es la lista completa del código empleado en este tema.

// CalculatorService.cs
//----------------------------------------------------------------
// Copyright (c) Microsoft Corporation.  All rights reserved.
//----------------------------------------------------------------

using System;
using System.ServiceModel;

namespace Microsoft.Samples.Discovery
{
    // Define a service contract.
    [ServiceContract(Namespace = "http://Microsoft.Samples.Discovery")]
    public interface ICalculatorService
    {
        [OperationContract]
        double Add(double n1, double n2);
        [OperationContract]
        double Subtract(double n1, double n2);
        [OperationContract]
        double Multiply(double n1, double n2);
        [OperationContract]
        double Divide(double n1, double n2);
    }

    // Service class which implements the service contract.
    public class CalculatorService : ICalculatorService
    {
        public double Add(double n1, double n2)
        {
            double result = n1 + n2;
            Console.WriteLine("Received Add({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }

        public double Subtract(double n1, double n2)
        {
            double result = n1 - n2;
            Console.WriteLine("Received Subtract({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }

        public double Multiply(double n1, double n2)
        {
            double result = n1 * n2;
            Console.WriteLine("Received Multiply({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }

        public double Divide(double n1, double n2)
        {
            double result = n1 / n2;
            Console.WriteLine("Received Divide({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }
    }
}

// Program.cs
//----------------------------------------------------------------
// Copyright (c) Microsoft Corporation.  All rights reserved.
//----------------------------------------------------------------

using System;
using System.ServiceModel;
using System.ServiceModel.Description;
using System.ServiceModel.Discovery;

namespace Microsoft.Samples.Discovery
{
    class Program
    {
        public static void Main()
        {
            Uri baseAddress = new Uri("net.tcp://localhost:9002/CalculatorService/" + Guid.NewGuid().ToString());
            Uri announcementEndpointAddress = new Uri("net.tcp://localhost:9021/Announcement");

            ServiceHost serviceHost = new ServiceHost(typeof(CalculatorService), baseAddress);
            try
            {
                ServiceEndpoint netTcpEndpoint = serviceHost.AddServiceEndpoint(typeof(ICalculatorService),
                    new NetTcpBinding(), string.Empty);

                // Create an announcement endpoint, which points to the Announcement Endpoint hosted by the proxy service.
                AnnouncementEndpoint announcementEndpoint = new AnnouncementEndpoint(new NetTcpBinding(),
                    new EndpointAddress(announcementEndpointAddress));

                ServiceDiscoveryBehavior serviceDiscoveryBehavior = new ServiceDiscoveryBehavior();
                serviceDiscoveryBehavior.AnnouncementEndpoints.Add(announcementEndpoint);

                // Make the service discoverable
                serviceHost.Description.Behaviors.Add(serviceDiscoveryBehavior);

                serviceHost.Open();

                Console.WriteLine("Calculator Service started at {0}", baseAddress);
                Console.WriteLine();
                Console.WriteLine("Press <ENTER> to terminate the service.");
                Console.WriteLine();
                Console.ReadLine();

                serviceHost.Close();
            }
            catch (CommunicationException e)
            {
                Console.WriteLine(e.Message);
            }
            catch (TimeoutException e)
            {
                Console.WriteLine(e.Message);
            }

            if (serviceHost.State != CommunicationState.Closed)
            {
                Console.WriteLine("Aborting the service...");
                serviceHost.Abort();
            }
        }
    }
}

Compartir a través de

Procedimiento para implementar un servicio reconocible que se registra con el proxy de detección

Para definir el contrato de servicio

Para hospedar el servicio

Ejemplo

Consulte también

Recursos adicionales