Ejemplo: escucha de cola persistente
Publicado: noviembre de 2016
Se aplica a: Dynamics CRM 2015
Este código de ejemplo es para Microsoft Dynamics CRM 2015 y actualización de Microsoft Dynamics CRM Online 2015. Descargue el paquete de SDK de Microsoft Dynamics CRM. Este código se puede encontrar en la siguiente ubicación en el paquete de descarga:
SampleCode\CS\Azure\PersistentQueueListener\PersistentQueueListener.cs
Requisitos
Este código de muestra requiere la siguiente referencia adicional del proyecto de Microsoft Visual Studio: Microsoft.ServiceBus. El ensamblado Microsoft.ServiceBus.dll se encuentra en Microsoft Azure SDK.
Muestra
Este ejemplo muestra cómo escribir una aplicación de escucha de Bus de servicio de Microsoft Azure para un contrato persistente de extremo de cola.
La aplicación de escucha espera a que se publique un mensaje de Microsoft Dynamics 365 en el bus del servicio y a que esté disponible en la cola del extremo. Cuando un mensaje está disponible en la cola, el paquete de escucha lee el mensaje, imprime el contexto de ejecución de Microsoft Dynamics 365 contenido en el mensaje a la consola y elimina el mensaje de la cola.
Ejemplo
using System;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Collections.Generic;
using System.Text;
using Microsoft.ServiceBus;
using Microsoft.ServiceBus.Messaging;
using Microsoft.Xrm.Sdk;
namespace Microsoft.Crm.Sdk.Samples
{
class Program
{
public static void Main(string[] args)
{
Consumer consumer = new Consumer();
consumer.CreateQueueClient();
consumer.ProcessMessages();
consumer.DeleteQueue();
}
}
internal class Consumer
{
private const String MyQueuePath = "MyQueue";
private QueueDescription queueDescription;
private QueueClient queueClient;
private Uri namespaceUri;
private TransportClientEndpointBehavior credential;
public Consumer()
{
Console.Write("Your Service Namespace: ");
string serviceNamespace = Console.ReadLine();
Console.Write("Your Issuer Name: ");
string issuerName = Console.ReadLine();
Console.Write("Your Issuer Secret: ");
string issuerSecret = Console.ReadLine();
// Configure queue settings.
this.queueDescription = new QueueDescription(MyQueuePath);
// Setting Max Size and TTL for demonstration purpose
// but can be changed per user discretion to suite their system needs.
// Refer service bus documentation to understand the limitations.
// Setting Queue max size to 1GB where as default Max Size is 5GB.
this.queueDescription.MaxSizeInMegabytes = 1024;
// Setting message TTL to 5 days where as default TTL is 14 days.
this.queueDescription.DefaultMessageTimeToLive = TimeSpan.FromDays(5);
// Create management credentials.
this.credential = new TransportClientEndpointBehavior()
{
TokenProvider = TokenProvider.CreateSharedSecretTokenProvider(issuerName, issuerSecret)
};
// Create the URI for the queue.
this.namespaceUri = ServiceBusEnvironment.CreateServiceUri("sb", serviceNamespace, String.Empty);
Console.WriteLine("Service Bus Namespace Uri address '{0}'", this.namespaceUri.AbsoluteUri);
}
public void CreateQueueClient()
{
// get the existing queue or create a new queue if it doesn't exist.
this.queueClient = GetOrCreateQueue(namespaceUri, this.credential.TokenProvider);
}
public void ProcessMessages()
{
// Get receive mode (PeekLock or ReceiveAndDelete) from queueClient.
ReceiveMode mode = this.queueClient.Mode;
while (true)
{
Console.Write("Press [Enter] to retrieve a message from the queue (type quit to exit): ");
string line = Console.ReadLine();
if (!string.IsNullOrEmpty(line) && string.Equals(line, "quit", StringComparison.OrdinalIgnoreCase))
{
break;
}
// Retrieve a message from the queue.
Console.WriteLine("Waiting for a message from the queue... ");
BrokeredMessage message;
try
{
message = this.queueClient.Receive();
// Check if the message received.
if (message != null)
{
try
{
// Verify EntityLogicalName and RequestName message properties
// to only process specific message sent from Microsoft Dynamics CRM.
string keyRoot = "https://schemas.microsoft.com/xrm/2011/Claims/";
string entityLogicalNameKey = "EntityLogicalName";
string requestNameKey = "RequestName";
object entityLogicalNameValue;
object requestNameValue;
message.Properties.TryGetValue(keyRoot + entityLogicalNameKey, out entityLogicalNameValue);
message.Properties.TryGetValue(keyRoot + requestNameKey, out requestNameValue);
// Filter message with specific message properties. i.e. EntityLogicalName=letter and RequestName=Create
if (entityLogicalNameValue != null && requestNameValue != null)
{
if (entityLogicalNameValue.ToString() == "letter" && requestNameValue.ToString() == "Create")
{
Console.WriteLine("--------------------------------");
Console.WriteLine(string.Format("Message received: Id = {0}", message.MessageId));
// Display message properties that are set on the brokered message.
Utility.PrintMessageProperties(message.Properties);
// Display body details.
Utility.Print(message.GetBody<RemoteExecutionContext>());
Console.WriteLine("--------------------------------");
}
else
{
continue;
}
}
else
{
continue;
}
// If receive mode is PeekLock then set message complete to remove message from queue.
if (mode == ReceiveMode.PeekLock)
{
message.Complete();
}
}
catch (System.Exception ex)
{
// Indicate a problem, unlock message in queue.
if (mode == ReceiveMode.PeekLock)
{
message.Abandon();
}
Console.WriteLine(ex.Message);
continue;
}
}
else
{
break;
}
}
catch (System.TimeoutException e)
{
Console.WriteLine(e.Message);
continue;
}
catch (System.ServiceModel.FaultException e)
{
Console.WriteLine(e.Message);
continue;
}
}
}
public void DeleteQueue()
{
DeleteQueueInternal(namespaceUri, MyQueuePath, credential.TokenProvider);
}
private void DeleteQueueInternal(Uri address, string path, TokenProvider tokenProvider)
{
var settings = new NamespaceManagerSettings() { TokenProvider = tokenProvider };
var namespaceClient = new ServiceBus.NamespaceManager(address, settings);
try
{
namespaceClient.DeleteQueue(path);
Console.WriteLine("Queue deleted successfully.");
}
catch (FaultException e)
{
Console.WriteLine("Exception when deleting queue.. {0}", e);
}
}
private QueueClient GetOrCreateQueue(Uri namespaceUri, TokenProvider tokenProvider)
{
NamespaceManager namespaceClient = new NamespaceManager(namespaceUri, tokenProvider);
// Create queue if not already exist.
if (!namespaceClient.QueueExists(MyQueuePath))
{
namespaceClient.CreateQueue(this.queueDescription);
Console.WriteLine("Queue created.");
}
else
{
Console.WriteLine("Queue already exists.");
}
MessagingFactory factory = MessagingFactory.Create(namespaceUri, tokenProvider);
Console.WriteLine("Creating queue client...");
return factory.CreateQueueClient(MyQueuePath, ReceiveMode.PeekLock);
}
}
internal static class Utility
{
public static void Print(RemoteExecutionContext context)
{
if (context == null)
{
Console.WriteLine("Context is null.");
return;
}
Console.WriteLine("UserId: {0}", context.UserId);
Console.WriteLine("OrganizationId: {0}", context.OrganizationId);
Console.WriteLine("OrganizationName: {0}", context.OrganizationName);
Console.WriteLine("MessageName: {0}", context.MessageName);
Console.WriteLine("Stage: {0}", context.Stage);
Console.WriteLine("Mode: {0}", context.Mode);
Console.WriteLine("PrimaryEntityName: {0}", context.PrimaryEntityName);
Console.WriteLine("SecondaryEntityName: {0}", context.SecondaryEntityName);
Console.WriteLine("BusinessUnitId: {0}", context.BusinessUnitId);
Console.WriteLine("CorrelationId: {0}", context.CorrelationId);
Console.WriteLine("Depth: {0}", context.Depth);
Console.WriteLine("InitiatingUserId: {0}", context.InitiatingUserId);
Console.WriteLine("IsExecutingOffline: {0}", context.IsExecutingOffline);
Console.WriteLine("IsInTransaction: {0}", context.IsInTransaction);
Console.WriteLine("IsolationMode: {0}", context.IsolationMode);
Console.WriteLine("Mode: {0}", context.Mode);
Console.WriteLine("OperationCreatedOn: {0}", context.OperationCreatedOn.ToString());
Console.WriteLine("OperationId: {0}", context.OperationId);
Console.WriteLine("PrimaryEntityId: {0}", context.PrimaryEntityId);
Console.WriteLine("OwningExtension LogicalName: {0}", context.OwningExtension.LogicalName);
Console.WriteLine("OwningExtension Name: {0}", context.OwningExtension.Name);
Console.WriteLine("OwningExtension Id: {0}", context.OwningExtension.Id);
Console.WriteLine("SharedVariables: {0}", (context.SharedVariables == null ? "NULL" :
SerializeParameterCollection(context.SharedVariables)));
Console.WriteLine("InputParameters: {0}", (context.InputParameters == null ? "NULL" :
SerializeParameterCollection(context.InputParameters)));
Console.WriteLine("OutputParameters: {0}", (context.OutputParameters == null ? "NULL" :
SerializeParameterCollection(context.OutputParameters)));
Console.WriteLine("PreEntityImages: {0}", (context.PreEntityImages == null ? "NULL" :
SerializeEntityImageCollection(context.PreEntityImages)));
Console.WriteLine("PostEntityImages: {0}", (context.PostEntityImages == null ? "NULL" :
SerializeEntityImageCollection(context.PostEntityImages)));
}
#region Private methods.
private static string SerializeEntity(Entity e)
{
StringBuilder sb = new StringBuilder();
sb.Append(Environment.NewLine);
sb.Append(" LogicalName: " + e.LogicalName);
sb.Append(Environment.NewLine);
sb.Append(" EntityId: " + e.Id);
sb.Append(Environment.NewLine);
sb.Append(" Attributes: [");
foreach (KeyValuePair<string, object> parameter in e.Attributes)
{
sb.Append(parameter.Key + ": " + parameter.Value + "; ");
}
sb.Append("]");
return sb.ToString();
}
private static string SerializeParameterCollection(ParameterCollection parameterCollection)
{
StringBuilder sb = new StringBuilder();
foreach (KeyValuePair<string, object> parameter in parameterCollection)
{
if (parameter.Value != null && parameter.Value.GetType() == typeof(Entity))
{
Entity e = (Entity)parameter.Value;
sb.Append(parameter.Key + ": " + SerializeEntity(e));
}
else
{
sb.Append(parameter.Key + ": " + parameter.Value + "; ");
}
}
return sb.ToString();
}
private static string SerializeEntityImageCollection(EntityImageCollection entityImageCollection)
{
StringBuilder sb = new StringBuilder();
foreach (KeyValuePair<string, Entity> entityImage in entityImageCollection)
{
sb.Append(Environment.NewLine);
sb.Append(entityImage.Key + ": " + SerializeEntity(entityImage.Value));
}
return sb.ToString();
}
#endregion
internal static void PrintMessageProperties(IDictionary<string, object> iDictionary)
{
if (iDictionary.Count == 0)
{
Console.WriteLine("No Message properties found.");
return;
}
foreach (var item in iDictionary)
{
String key = (item.Key != null) ? item.Key.ToString() : "";
String value = (item.Value != null)? item.Value.ToString() : "";
Console.WriteLine( key + " " + value);
}
}
}
}
Ver también
Escribir un agente de escucha para una solución de Microsoft Azure
Ejecutar un programa sencillo mediante los servicios web de Microsoft Dynamics CRM 2015
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