我有一个在MSMQ中创建私人消息的WCF服务。消息创建正常，我可以看到客户端应用程序正在创建的消息。
我也有一个似乎运行良好的MSMQ监听器服务。当我启动服务时，它似乎成功“处理”队列中的消息并将其删除。但是，我的侦听器服务的实现似乎没有被执行。
我对MSMQ很新，我不知道为什么要从队列中删除消息，以及为什么我的侦听器方法中的代码没有被执行。
以下是我的服务类......
[ServiceContract(Namespace = ServiceConstants.NAMESPACE, Name = "IOrderService")]
public interface IOrderQueueProcessingService
{
[OperationContract(IsOneWay = true, Action = "*")]
void ProcessOrderQueue(MsmqMessage<string> message);
}
public abstract class OrderQueueProcessingServiceBase : ServiceBase, IOrderQueueProcessingService
{
#region CONSTRUCTORS
protected OrderQueueProcessingServiceBase() { }
protected OrderQueueProcessingServiceBase(List<EventRecord> existingList) : base(existingList) { }
#endregion //CONSTRUCTORS
#region IOrderQueueProcessingService Members
[OperationBehavior(TransactionScopeRequired = false, TransactionAutoComplete = true)]
public virtual void ProcessOrderQueue(MsmqMessage<string> message)
{
throw new NotImplementedException();
}
#endregion
}
public class OrderQueueProcessingService : OrderQueueProcessingServiceBase
{
#region Constructors
public OrderQueueProcessingService() {}
public OrderQueueProcessingService(List<EventRecord> existingList) : base(existingList) { }
#endregion
/// <summary>
/// Processes any Orders in the Orders Queue
/// </summary>
/// <param name="message"></param>
public override void ProcessOrderQueue(MsmqMessage<string> message)
{
var q = new MessageQueue(@".\private$\msmqdemo/submitorderservice.svc");
q.Send("hey");
/*
using (new Tracer("OrderQueueProcessingService"))
{
// add data context to work with.
using (var unitOfWork = new TLFDataContext())
{
var newOrderLines = new List<OrderLineDataContract>
{
new OrderLineDataContract
{
C = "test",
IC = "msw",
Qty = 1,
T = "volume" ,
ED = DateTime.UtcNow.AddDays(5)
}
};
var newOrder = new OrderDataContract
{
LIs = newOrderLines.AsEnumerable(),
PId = 9323,
POId = 8686,
S = "new"
};
var orderService = new OrderService();
var createdOrder = orderService.CreateOrder(null, null, newOrder);
//unitOfWork.SubmitUnitOfWork();
//return null;
}
}*/
}
}
我注释掉了我最终尝试执行的代码，并将其替换为简单的MSMQ消息发送，以进行测试。这似乎应该工作正常。任何帮助将不胜感激。
以下配置设置......
<service name="ServiceImplementation.OrderQueueProcessingService">
<host>
<baseAddresses>
<add baseAddress="https://localhost:9000/OrderQueueProcessingService.svc" />
</baseAddresses>
</host>
<endpoint address="net.msmq://localhost/private/testingqueue/OrderQueueProcessingService.svc" binding="netMsmqBinding" bindingConfiguration="MsmqBindingNonTransactionalNoSecurity" contract="IOrderQueueProcessingService" />
</service>
答案 0 :(得分：0)
我能够找出问题所在。我没有为QueueOnPeekComplted事件处理任何事件。我将它添加到Initialize方法，并能够成功处理我的消息。我还添加了无法处理的消息的处理。下面是我的OrderQueueProcessingService的新实现。
public class OrderQueueProcessingService : OrderQueueProcessingServiceBase, IDisposable
{
#region Constructors
public OrderQueueProcessingService()
{
Initialize(ConfigurationManager.AppSettings["OrderQueueProcessingQueueName"]);
}
public OrderQueueProcessingService(List<EventRecord> existingList) : base(existingList) {}
#endregion
#region Properties
private MessageQueue Queue { get; set; }
#endregion
#region IDisposable Members
public new void Dispose()
{
if (Queue == null) return;
//unsubscribe and dispose
Queue.PeekCompleted -= QueueOnPeekCompleted;
Queue.Dispose();
}
#endregion
private void Initialize(string queueName)
{
Queue = new MessageQueue(queueName, false, true, QueueAccessMode.Receive)
{
Formatter = new XmlMessageFormatter(new[] {typeof (OrderQueueDataContract)})
};
//setup events and start.
Queue.PeekCompleted += QueueOnPeekCompleted;
Queue.BeginPeek();
}
private static void MoveMessageToDeadLetter(IDisposable message)
{
var q = new MessageQueue(ConfigurationManager.AppSettings["OrderProcessingDLQ"], QueueAccessMode.Send)
{
Formatter = new XmlMessageFormatter(new[] {typeof (OrderQueueDataContract)})
};
q.Send(message, MessageQueueTransactionType.Single);
q.Dispose();
}
/// <summary>
/// Processes the specified Order message
/// </summary>
/// <param name="orderMessage"></param>
public override void ProcessOrderQueue(OrderQueueDataContract orderMessage)
{
using (var unitOfWork = new MyDataContext())
{
switch (orderMessage.M.ToLower())
{
case "create":
DataAccessLayer.CreateOrder(unitOfWork, orderMessage.O.TranslateToBe());
break;
default:
break;
}
}
}
private void QueueOnPeekCompleted(object sender, PeekCompletedEventArgs peekCompletedEventArgs)
{
var asyncQueue = (MessageQueue) sender;
using (var transaction = new MessageQueueTransaction())
{
transaction.Begin();
try
{
using (var message = asyncQueue.ReceiveById(peekCompletedEventArgs.Message.Id, TimeSpan.FromSeconds(30), transaction))
{
if (message != null) ProcessOrderQueue((OrderQueueDataContract) message.Body);
}
}
catch (InvalidOperationException ex)
{
transaction.Abort();
}
catch (Exception ex)
{
transaction.Abort();
}
if (transaction.Status != MessageQueueTransactionStatus.Aborted) transaction.Commit();
else
{
using (var message = asyncQueue.ReceiveById(peekCompletedEventArgs.Message.Id, TimeSpan.FromSeconds(30), transaction))
{
if (message != null)
{
MoveMessageToDeadLetter(message);
message.Dispose();
}
}
EventLog.WriteEntry("OrderQueueProcessingService", "Could not process message: " + peekCompletedEventArgs.Message.Id);
}
transaction.Dispose();
}
asyncQueue.EndPeek(peekCompletedEventArgs.AsyncResult);
asyncQueue.BeginPeek();
}
}
是否有人发现此实施有任何问题？我不得不摆弄它，但它已通过单元测试和过程测试。
我注意到的一件事是，当我的服务首次启动时，它会处理队列中的所有消息;这可能会阻碍我的其他服务的启动。当我在测试时在我的控制台应用程序中启动它时，这可能只是一个问题。为了安全起见，我最后开始这项服务。