我在使用Saga超时时遇到NServiceBus 4.6.1依赖注入问题。我在ASP.NET Web应用程序中使用自托管并具有属性注入设置。它可以在从Web控制器发送消息时起作用,但是,当在saga中处理Timeout消息时,相同的DI属性未被设置且为null。
以下是设置的关键部分:
的Global.asax.cs
public class MvcApplication : System.Web.HttpApplication
{
public static IWindsorContainer Container { get; private set; }
protected void Application_Start()
{
ConfigureIoC();
AreaRegistration.RegisterAllAreas();
GlobalConfiguration.Configure(WebApiConfig.Register);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
DeviceManagerDbInitializer.Instance.InitializeDatabase();
ConfigureNServiceBus();
}
protected void Application_End()
{
if (Container != null)
{
Container.Dispose();
}
}
private static void ConfigureIoC()
{
Container = new WindsorContainer()
.Install(FromAssembly.This());
var controllerFactory = new WindsorControllerFactory(Container.Kernel);
ControllerBuilder.Current.SetControllerFactory(controllerFactory);
GlobalConfiguration.Configuration.DependencyResolver
= new WindsorDependencyResolver(Container);
}
private void ConfigureNServiceBus()
{
Configure.ScaleOut(s => s.UseSingleBrokerQueue());
Configure.Instance.PeekInterval(500);
Configure.Instance.MaximumWaitTimeWhenIdle(2000);
Feature.Enable<TimeoutManager>();
Feature.Enable<Sagas>();
IStartableBus startableBus = Configure.With()
.DefineEndpointName("MyQueue")
.CastleWindsorBuilder(Container) //using NServiceBus CastleWindsor 4.6.1
.UseTransport<AzureStorageQueue>()
.UseAzureTimeoutPersister()
.AzureSagaPersister()
.PurgeOnStartup(false)
.UnicastBus()
.LoadMessageHandlers()
.RunHandlersUnderIncomingPrincipal(false)
.Log4Net(new DebugAppender { Threshold = Level.Warn })
.RijndaelEncryptionService()
.CreateBus();
Configure.Instance.ForInstallationOn<Windows>().Install();
startableBus.Start();
}
}
佐贺班
public class MySaga: Saga<MySagaData>,
IAmStartedByMessages<StartMySagaCommand>,
IHandleMessages<SomeMessage>,
IHandleTimeouts<SomeTimeout>
{
public DependentService MyInjectedService {get; set;}
public override void ConfigureHowToFindSaga()
{
ConfigureMapping<StartMySagaCommand>( message => message.MyId).ToSaga( saga => saga.MyId );
ConfigureMapping<SomeMessage>( message => message.MyId).ToSaga( saga => saga.MyId );
ConfigureMapping<SomeTimeout>( message => message.MyId).ToSaga( saga => saga.MyId );
}
public void Handle(SomeMessage message)
{
// Here MyInjectedService is fine
MyInjectedService.DoSomething(message);
}
public void Timeout(SomeTimeout state)
{
// Here MyInjectedService is always null
MyInjectedService.DoSomething(state);
}
}
答案 0 :(得分:2)
我在这里想出了问题。由于Castle.Windsor生活方式设置为LifestylePerWebRequest,因此依赖注入在Saga的超时处理程序中无效,例如:
public class WindsorServicesInstaller : IWindsorInstaller
{
public void Install(IWindsorContainer container, IConfigurationStore store)
{
container.Register( Component.For<DependentService>()
.LifestylePerWebRequest() );
}
}
将Lifestyle更改为LifeStyleTransient后,它开始工作。任何其他非网络请求&#39;生活方式也应该在这里发挥作用。
在我们的设置中,NServiceBus主机在Web应用程序下运行,并且常规消息处理程序很好,因为它们是在控制器操作中调用的,例如:
[HttpPost]
public ActionResult DoSomething( int myId)
{
_bus.Send( "MyBus", new SomeMessage { MyId = something.MyId } );
return View();
}
当saga为此处理SomeMessage消息时,它仍然必须是Web请求的一部分,Windsor会正常解析依赖关系。但是,超时会在一段时间后触发(在这种情况下为五分钟),它们不是Web请求的一部分。 Windsor无法解析DependentService对象,它保持为null。