Rhino ServiceBus 启动时出现异常

Question

我的系统分为两部分。两个部分相互通信 其他使用Rhino服务总线。 在Windows 7上没有问题，但是如果我在其他地方启动它 （WinXP，Server 2003，...）我得到以下异常 当我调用Rhino.ServiceBus.Hosting.DefaultHost.Start(..)时：

System.NullReferenceException: Object reference not set to an instance of an object.
   at Spring.Objects.Factory.Support.AbstractObjectFactory.GetObjectFromFactoryObject(IFactoryObject factory, String objectName, RootObjectDefinition rod)
   at Spring.Objects.Factory.Support.AbstractObjectFactory.GetObjectForInstance(Object instance, String name, String canonicalName, RootObjectDefinition rod)
   at Spring.Objects.Factory.Support.AbstractObjectFactory.GetObjectInternal(String name, Type requiredType, Object[] arguments, Boolean suppressConfigure)
   at Spring.Objects.Factory.Support.AbstractObjectFactory.GetObject(String name)
   at Spring.Context.Support.AbstractApplicationContext.GetObject(String name)
   at Rhino.ServiceBus.Spring.ApplicationContextExtensions.Get(IApplicationContext context, Type type)
   at Rhino.ServiceBus.Spring.ApplicationContextExtensions.Get[T](IConfigurableApplicationContext context)
   at Rhino.ServiceBus.Spring.SpringBootStrapper.GetInstance[T]()
   at Rhino.ServiceBus.Hosting.DefaultHost.InitailizeBus(String asmName)
   at Rhino.ServiceBus.Hosting.DefaultHost.Start(String asmName)

这是Spring日志的片段：

2012-01-14 13:25:01,084 DEBUG Spring.Objects.Factory.Support.DefaultListableObjectFactory - Invoking IObjectPostProcessors after initialization of object '351a5f07-e33d-4be0-84cf-1738a8feba24'
2012-01-14 13:25:01,084 DEBUG Spring.Objects.Factory.Support.DefaultListableObjectFactory -          GetObjectInternal: returning instance for objectname 351a5f07-e33d-4be0-84cf-1738a8feba24
2012-01-14 13:25:01,084 ERROR Spring.Objects.Factory.Support.DefaultListableObjectFactory -       GetObjectInternal: error obtaining object Rhino.ServiceBus.Msmq.FlatQueueStrategy
2012-01-14 13:25:01,084 ERROR Spring.Objects.Factory.Support.DefaultListableObjectFactory -    GetObjectInternal: error obtaining object Rhino.ServiceBus.Msmq.MsmqTransport
2012-01-14 13:25:01,084 ERROR Spring.Objects.Factory.Support.DefaultListableObjectFactory - GetObjectInternal: error obtaining object 1a769f24-5410-4cee-8d7a-76c3a91b1ce1

Answer 1

问题已解决：
在 MSMQ 版本 3 或更低版本中（在 Windows XP、Windows Server 2003 等系统上），不支持子队列，因此 Rhino SB 使用 FlatQueueStrategy 来管理队列。
配置Spring对象容器时出现问题。具体来说，Rhino.ServiceBus.Spring.SpringBuilder类中有两个地方需要修改。

1) 方法RegisterMsmqTransport：

if (queueStrategyType.GetConstructor(new[] { typeof(IQueueStrategy), typeof(Uri) }) != null)
{
    applicationContext.RegisterSingleton(queueStrategyType, typeof (IQueueStrategy).FullName, applicationContext.Get<IEndpointRouter>(), config.Endpoint);
}
else
{
    // use default
    applicationContext.RegisterSingleton(queueStrategyType);
}

总是调用if语句的第二部分，因为FlatQueueStrategy没有参数为IQueueStrategy和Uri类型的构造函数。
但它甚至没有不带参数的构造函数。因此FlatQueueStrategy没有在对象容器中正确注册。
这部分的修改是：

if (queueStrategyType.GetConstructor(new[] { typeof(IEndpointRouter), typeof(Uri) }) != null)
{
    applicationContext.RegisterSingleton(queueStrategyType, typeof (IQueueStrategy).FullName, applicationContext.Get<IEndpointRouter>(), config.Endpoint);
}
else
{
    // use default
    applicationContext.RegisterSingleton(queueStrategyType);
}

2) 方法RegisterDefaultServices

下一个问题是在方法RegisterDefaultServices 中：

    applicationContext.RegisterSingleton<IServiceLocator>(() => new SpringServiceLocator(applicationContext));
    applicationContext.RegisterSingletons<IBusConfigurationAware>(typeof(IServiceBus).Assembly);

    foreach (var busConfigurationAware in applicationContext.GetAll<IBusConfigurationAware>())
    {
        busConfigurationAware.Configure(config, this);  // here is the method RegisterMsmqTransport called
    }

    foreach (var module in config.MessageModules)
    {
        applicationContext.RegisterSingleton(module, module.FullName);
    }

    applicationContext.RegisterSingleton<IReflection>(() => new DefaultReflection());
    applicationContext.RegisterSingleton(config.SerializerType);
    applicationContext.RegisterSingleton<IEndpointRouter>(() => new EndpointRouter());

在IEndpointRouter 在对象容器中注册之前调用方法RegisterMsmqTransport。
IEndpointRouter 在 RegisterMsmqTransport 方法中使用（参见 1），因此方法调用

    applicationContext.Get<IEndpointRouter>()

会产生异常。
这里的修改是：

    applicationContext.RegisterSingleton<IServiceLocator>(() => new SpringServiceLocator(applicationContext));
    applicationContext.RegisterSingletons<IBusConfigurationAware>(typeof(IServiceBus).Assembly);
    applicationContext.RegisterSingleton<IReflection>(() => new DefaultReflection());
    applicationContext.RegisterSingleton<IEndpointRouter>(() => new EndpointRouter());

    foreach (var busConfigurationAware in applicationContext.GetAll<IBusConfigurationAware>())
    {
        busConfigurationAware.Configure(config, this);
    }

    foreach (var module in config.MessageModules)
    {
        applicationContext.RegisterSingleton(module, module.FullName);
    }

    applicationContext.RegisterSingleton(config.SerializerType);