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Como fazer: Trocar mensagens com pontos de extremidade WCF e aplicações de filas de mensagens

Você pode integrar aplicações existentes de Fila de Mensagens (MSMQ) com aplicações Windows Communication Foundation (WCF) usando a ligação de integração MSMQ para converter mensagens MSMQ para e a partir de mensagens WCF. Isso permite que você ligue para aplicativos recetores MSMQ a partir de clientes WCF, bem como ligue para serviços WCF a partir de aplicativos remetentes MSMQ.

Nesta seção, explicamos como usar o MsmqIntegrationBinding para comunicação em fila entre (1) um cliente WCF e um serviço de aplicativo MSMQ escrito usando System.Messaging e (2) um cliente de aplicativo MSMQ e um serviço WCF.

Para obter um exemplo completo que demonstra como chamar uma aplicação recetora de MSMQ a partir de um cliente WCF, consulte o exemplo do Windows Communication Foundation para Message Queuing.

Para obter um exemplo completo que demonstra como chamar um serviço WCF de um cliente MSMQ, consulte o Message Queuing to Windows Communication Foundation exemplo.

Para criar um serviço WCF que recebe mensagens de um cliente MSMQ

  1. Defina uma interface que defina o contrato de serviço para o serviço WCF que recebe mensagens enfileiradas de um aplicativo remetente MSMQ, conforme mostrado no código de exemplo a seguir.

    [ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]
[ServiceKnownType(typeof(PurchaseOrder))]
public interface IOrderProcessor
{
    [OperationContract(IsOneWay = true, Action = "*")]
    void SubmitPurchaseOrder(MsmqMessage<PurchaseOrder> msg);
}

    <ServiceContract(Namespace:="http:'Microsoft.ServiceModel.Samples")> _
<ServiceKnownType(GetType(PurchaseOrder))> _
Public Interface IOrderProcessor
    <OperationContract(IsOneWay:=True, Action:="*")> _
    Sub SubmitPurchaseOrder(ByVal msg As MsmqMessage(Of PurchaseOrder))
End Interface

  2. Implemente a interface e aplique o atributo ServiceBehaviorAttribute à classe, conforme mostrado no código de exemplo a seguir.

    public class OrderProcessorService : IOrderProcessor
{
    [OperationBehavior(TransactionScopeRequired = true, TransactionAutoComplete = true)]
    public void SubmitPurchaseOrder(MsmqMessage<PurchaseOrder> ordermsg)
    {
        PurchaseOrder po = (PurchaseOrder)ordermsg.Body;
        Random statusIndexer = new Random();
        po.Status = (OrderStates)statusIndexer.Next(3);
        Console.WriteLine($"Processing {po} ");
    }

    // Host the service within this EXE console application.
public static void Main()
{
    // Get base address from appsettings in configuration.
    Uri baseAddress = new Uri(ConfigurationManager.AppSettings["baseAddress"]);

    // Create a ServiceHost for the CalculatorService type and provide the base address.
    using (ServiceHost serviceHost = new ServiceHost(typeof(IOrderProcessor), baseAddress))
    {
    // Open the ServiceHostBase to create listeners and start listening for messages.
        serviceHost.Open();

    // The service can now be accessed.
        Console.WriteLine("The service is ready.");
        Console.WriteLine($"The service is running in the following account: {WindowsIdentity.GetCurrent().Name}");
        Console.WriteLine("Press <ENTER> to terminate service.");
        Console.WriteLine();
        Console.ReadLine();

    // Close the ServiceHostBase to shutdown the service.
        serviceHost.Close();
    }
}
}

    Public Class OrderProcessorService
    Implements IOrderProcessor

    <OperationBehavior(TransactionScopeRequired:=True, TransactionAutoComplete:=True)> _
    Public Sub SubmitPurchaseOrder(ByVal ordermsg As MsmqMessage(Of PurchaseOrder)) Implements IOrderProcessor.SubmitPurchaseOrder
        Dim po As PurchaseOrder = ordermsg.Body
        Dim statusIndexer As New Random()
        po.Status = statusIndexer.Next(3)
        Console.WriteLine("Processing {0} ", po)
    End Sub
End Class

  3. Crie um arquivo de configuração que especifique o MsmqIntegrationBinding.

  4. Instancie um objeto ServiceHost que usa a associação configurada.

Para criar um cliente WCF que envia mensagens para um aplicativo recetor MSMQ

  1. Defina uma interface que defina o contrato de serviço para o cliente WCF que envia mensagens enfileiradas para o recetor MSMQ, conforme mostrado no código de exemplo a seguir.

    [System.ServiceModel.ServiceContractAttribute(Namespace = "http://Microsoft.ServiceModel.Samples")]
public interface IOrderProcessor
{
    [OperationContract(IsOneWay = true, Action = "*")]
    void SubmitPurchaseOrder(MsmqMessage<PurchaseOrder> msg);
}

public interface IOrderProcessorChannel : IOrderProcessor, System.ServiceModel.IClientChannel
{
}

    <System.ServiceModel.ServiceContractAttribute(Namespace:="http:'Microsoft.ServiceModel.Samples")> _
Public Interface IOrderProcessor
    <OperationContract(IsOneWay:=True, Action:="*")> _
    Sub SubmitPurchaseOrder(ByVal msg As MsmqMessage(Of PurchaseOrder))
end interface

Public Interface IOrderProcessorChannel
    Inherits IOrderProcessor, System.ServiceModel.IClientChannel
End Interface

  2. Defina uma classe de cliente que o cliente WCF usa para chamar o recetor MSMQ.

    MsmqIntegrationBinding binding = new MsmqIntegrationBinding();
EndpointAddress address = new EndpointAddress("msmq.formatname:DIRECT=OS:.\\private$\\Orders");
ChannelFactory<IOrderProcessor> channelFactory = new ChannelFactory<IOrderProcessor>(binding, address);
IOrderProcessor channel = channelFactory.CreateChannel();

PurchaseOrder po = new PurchaseOrder();
po.customerId = "somecustomer.com";
po.poNumber = Guid.NewGuid().ToString();

PurchaseOrderLineItem lineItem1 = new PurchaseOrderLineItem();
lineItem1.productId = "Blue Widget";
lineItem1.quantity = 54;
lineItem1.unitCost = 29.99F;

PurchaseOrderLineItem lineItem2 = new PurchaseOrderLineItem();
lineItem2.productId = "Red Widget";
lineItem2.quantity = 890;
lineItem2.unitCost = 45.89F;

po.orderLineItems = new PurchaseOrderLineItem[2];
po.orderLineItems[0] = lineItem1;
po.orderLineItems[1] = lineItem2;

MsmqMessage<PurchaseOrder> ordermsg = new MsmqMessage<PurchaseOrder>(po);
using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required))
{
    channel.SubmitPurchaseOrder(ordermsg);
    scope.Complete();
}
Console.WriteLine($"Order has been submitted:{po}");

    Dim binding As New MsmqIntegrationBinding()
Dim address As New EndpointAddress("msmq.formatname:DIRECT=OS:.\\private$\\Orders")
Dim channelFactory As New ChannelFactory(Of IOrderProcessor)(binding, address)
Dim channel As IOrderProcessor = channelFactory.CreateChannel()

Dim po As New PurchaseOrder()
po.customerId = "somecustomer.com"
po.poNumber = Guid.NewGuid().ToString()

Dim lineItem1 As New PurchaseOrderLineItem()
lineItem1.productId = "Blue Widget"
lineItem1.quantity = 54
lineItem1.unitCost = 29.99F

Dim lineItem2 = New PurchaseOrderLineItem()
lineItem2.productId = "Red Widget"
lineItem2.quantity = 890
lineItem2.unitCost = 45.89F

Dim lineItems(1) As PurchaseOrderLineItem
lineItems(0) = lineItem1
lineItems(1) = lineItem2

po.orderLineItems = lineItems

Dim ordermsg As MsmqMessage(Of PurchaseOrder) = New MsmqMessage(Of PurchaseOrder)(po)
Using scope As New TransactionScope(TransactionScopeOption.Required)
    channel.SubmitPurchaseOrder(ordermsg)
    scope.Complete()
End Using
Console.WriteLine("Order has been submitted:{0}", po)

  3. Crie uma configuração que especifique o uso da associação MsmqIntegrationBinding.

    MsmqIntegrationBinding binding = new MsmqIntegrationBinding("MyBindingConfig");

    Dim binding As New MsmqIntegrationBinding("MyBindingConfig")

  4. Crie uma instância da classe client e chame o método definido pelo serviço de recebimento de mensagens.

    // Create the purchase order.
PurchaseOrder po = new PurchaseOrder();
po.customerId = "somecustomer.com";
po.poNumber = Guid.NewGuid().ToString();

PurchaseOrderLineItem lineItem1 = new PurchaseOrderLineItem();
lineItem1.productId = "Blue Widget";
lineItem1.quantity = 54;
lineItem1.unitCost = 29.99F;

PurchaseOrderLineItem lineItem2 = new PurchaseOrderLineItem();
lineItem2.productId = "Red Widget";
lineItem2.quantity = 890;
lineItem2.unitCost = 45.89F;

po.orderLineItems = new PurchaseOrderLineItem[2];
po.orderLineItems[0] = lineItem1;
po.orderLineItems[1] = lineItem2;

OrderProcessorClient client = new OrderProcessorClient("OrderResponseEndpoint");
MsmqMessage<PurchaseOrder> ordermsg = new MsmqMessage<PurchaseOrder>(po);
using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required))
{
    client.SubmitPurchaseOrder(ordermsg);
    scope.Complete();
}

Console.WriteLine($"Order has been submitted:{po}");

//Closing the client gracefully closes the connection and cleans up resources.
client.Close();

Console.WriteLine();
Console.WriteLine("Press <ENTER> to terminate client.");
Console.ReadLine();

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