[英]WCF: Custom ServiceHostFactory errors after Application Pool suspension for NetMsmq but not Http
I've created a custom host factory to support container based serviced instantiation and imperfect async cancellation. 我创建了一个自定义宿主工厂,以支持基于容器的服务实例化和不完美的异步取消。 The service is instantiated on a per-call basis:
该服务在每个呼叫的基础上实例化:
public class DIServiceHostFactory : ServiceHostFactory
{
protected IContainer Container { get; private set; }
public DIServiceHostFactory()
: this(ContainerFactory.GetContainerForMap<DIServiceHostFactory>())
{
}
public DIServiceHostFactory(IContainer container)
{
this.Container = container;
}
protected override System.ServiceModel.ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
{
return new DIServiceHost(this.Container, serviceType, baseAddresses);
}
}
public class DIServiceHost : ServiceHost
{
protected IContainer Container { get; private set; }
public DIServiceHost() : this(ContainerFactory.GetContainerForMap<DIServiceHost>()) { }
public DIServiceHost(IContainer container)
{
this.Container = container;
}
public DIServiceHost(IContainer container, Type serviceType, params Uri[] baseAddresses) : base(serviceType, baseAddresses)
{
this.Container = container;
}
protected override void OnOpening()
{
Description.Behaviors.Add(CreateBehavior());
base.OnOpening();
}
protected virtual DIServiceBehavior CreateBehavior()
{
return new DIServiceBehavior(this.Container);
}
}
public class DIServiceBehavior : IServiceBehavior
{
protected IContainer Container { get; private set; }
public DIServiceBehavior(IContainer container)
{
this.Container = container;
}
public virtual void AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
{
}
protected virtual DIInstanceProvider ConstructProvider(ServiceDescription description)
{
return new DIInstanceProvider(description.ServiceType, Container);
}
public virtual void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
{
foreach (ChannelDispatcher cd in serviceHostBase.ChannelDispatchers.OfType<ChannelDispatcher>())
{
foreach (EndpointDispatcher ed in cd.Endpoints)
{
ed.DispatchRuntime.InstanceProvider = ConstructProvider(serviceDescription);
}
}
}
public virtual void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
{
}
}
public class DIInstanceProvider : IInstanceProvider
{
protected Type ServiceType { get; private set; }
protected IContainer Container { get; private set; }
protected ILogger Logger { get; private set; }
public DIInstanceProvider(Type serviceType, IContainer container)
{
this.ServiceType = serviceType;
this.Container = container;
ILogger logger;
container.TryResolve<ILogger>(out logger);
this.Logger = logger;
}
public virtual object GetInstance(InstanceContext instanceContext, Message message)
{
if (this.Logger != null)
this.Logger.Info(message.ToString());
CancellationTokenSource cancellationToken = new CancellationTokenSource();
var s = this.Container.Resolve(this.ServiceType);
var service = s as ICancellableService;
if (service != null)
{
service.CancellationToken = cancellationToken.Token;
instanceContext.Faulted += (sender, e) => cancellationToken.Cancel();
instanceContext.Closing += (sender, e) => cancellationToken.Cancel();
}
return s;
}
public object GetInstance(InstanceContext instanceContext)
{
return GetInstance(instanceContext, null);
}
public virtual void ReleaseInstance(InstanceContext instanceContext, object instance)
{
}
}
The primary usage is through the netmsmq binding, I notice when I first start the application the client receives no errors and the MSMQ just holds the data until I hit the service over HTTP through a web browser, I'm not sure if this error is generated at this time. 主要用法是通过netmsmq绑定,我注意到,当我第一次启动该应用程序时,客户端没有收到任何错误,而MSMQ只是保留数据,直到我通过Web浏览器通过HTTP命中该服务为止,我不确定是否是此错误此时产生的。 After that it will process through the queue until the app pool suspends due to inactivity (currently set at 20min).
之后,它将处理队列直到应用程序池由于不活动而暂停(当前设置为20分钟)。 Then I receive the follow error frequently (but not with every client request, I had ~250 errors in my event log this morning and over 1500 messages waiting in my queue):
然后,我经常收到跟随错误(但不是每次客户请求都收到,今天早上我的事件日志中有250个错误,队列中有1500多个消息在等待):
WebHost failed to process a request.
Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/17653682
Exception: System.ServiceModel.ServiceActivationException: The service '/MerchReport/reportconsumer.svc' cannot be activated due to an exception during compilation. The exception message is: Object reference not set to an instance of an object.. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at United.UEL.WCF.DIInstanceProvider..ctor(Type serviceType, IContainer container)
at United.UEL.WCF.DIServiceBehavior.ConstructProvider(ServiceDescription description)
at United.UEL.WCF.DIServiceBehavior.ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
at System.ServiceModel.Description.DispatcherBuilder.InitializeServiceHost(ServiceDescription description, ServiceHostBase serviceHost)
at System.ServiceModel.ServiceHostBase.InitializeRuntime()
at System.ServiceModel.ServiceHostBase.OnBeginOpen()
at System.ServiceModel.ServiceHostBase.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
at System.ServiceModel.Channels.CommunicationObject.Open()
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.ActivateService(ServiceActivationInfo serviceActivationInfo, EventTraceActivity eventTraceActivity)
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath, EventTraceActivity eventTraceActivity)
--- End of inner exception stack trace ---
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath, EventTraceActivity eventTraceActivity)
at System.ServiceModel.ServiceHostingEnvironment.EnsureServiceAvailableFast(String relativeVirtualPath, EventTraceActivity eventTraceActivity)
Process Name: w3wp
Process ID: 13740
It appears that my container is not configured when MSMQ hits it. 看来我的容器没有被MSMQ命中。 Currently I call my bootstrapper in the Global.asax.Application_Start event, is there possibly a better place to call it?
当前,我在Global.asax.Application_Start事件中调用我的引导程序,有没有更好的地方可以调用它?
Found this: http://blogs.msdn.com/b/wenlong/archive/2006/01/11/511514.aspx 找到了这个: http : //blogs.msdn.com/b/wenlong/archive/2006/01/11/511514.aspx
Explains several options for dealing with non-http activation initializations. 说明用于处理非http激活初始化的几个选项。
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