[英]wcf msmq listener service removes messages but doesn't process
我有一个WCF服务,可以在MSMQ中创建私人消息。 消息创建良好,并且可以看到我的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侦听器服务。 当我启动该服务时,它似乎已成功“处理”了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未执行。
我对MSMQ还是很陌生,我也不知道为什么从队列中删除消息,以及为什么我的侦听器方法中的代码没有得到执行。
以下是我的服务类别...
[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,并用一个简单的MSMQ消息send替换了它,以进行测试。 这似乎应该正常工作。 任何帮助将不胜感激。
下面的配置设置...
<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>
我能够弄清楚我的问题。 QueueOnPeekComplted事件没有任何事件处理。 我将其添加到Initialize方法中,并能够成功处理我的消息。 我还添加了对无法处理的消息的处理。 以下是我的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();
}
}
有人看到此实现有任何问题吗? 我不得不花很多时间弄弄它,但是它已经通过了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。 这可能会阻止我启动其他服务。 只有在测试时在控制台应用程序中启动它们时,这才可能是一个问题。 为了安全起见,我最后启动了此服务。
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