C# AppDomain和MarshallByRefObject生命周期:如何避免RemotingException?
当MarshalByRef对象从一个AppDomain(1)传递到另一个AppDomain(2)时,如果您在第二个AppDomain(2)中对其调用方法之前等待6分钟,您将获得RemotingException: System.Runtime.Remoting.RemotingException: 对象[…]已断开连接或 服务器上不存在 有关此isse的一些文档:C# AppDomain和MarshallByRefObject生命周期:如何避免RemotingException?,c#,.net,remoting,appdomain,object-lifetime,C#,.net,Remoting,Appdomain,Object Lifetime,当MarshalByRef对象从一个AppDomain(1)传递到另一个AppDomain(2)时,如果您在第二个AppDomain(2)中对其调用方法之前等待6分钟,您将获得RemotingException: System.Runtime.Remoting.RemotingException: 对象[…]已断开连接或 服务器上不存在 有关此isse的一些文档: -实例生命周期,cbrumme说“我们应该解决这个问题。”:( 如果我错了,请纠正我:如果InitializeLifetime
- -实例生命周期,cbrumme说“我们应该解决这个问题。”:(
是否有一种方法可以禁用生存期并使代理(在AppDomain 2中)和对象(在AppDomain1中)保持活动状态,直到代理最终确定?可能是使用ISponsor…?我终于找到了一种方法来执行客户端激活的实例,但它涉及到终结器中的托管代码:( 我将我的类专门用于跨AppDomain通信,但您可以修改它并尝试其他远程处理。 如果你发现任何错误,请告诉我 以下两个类必须位于加载到所有相关应用程序域中的程序集中
/// <summary>
/// Stores all relevant information required to generate a proxy in order to communicate with a remote object.
/// Disconnects the remote object (server) when finalized on local host (client).
/// </summary>
[Serializable]
[EditorBrowsable(EditorBrowsableState.Never)]
public sealed class CrossAppDomainObjRef : ObjRef
{
/// <summary>
/// Initializes a new instance of the CrossAppDomainObjRef class to
/// reference a specified CrossAppDomainObject of a specified System.Type.
/// </summary>
/// <param name="instance">The object that the new System.Runtime.Remoting.ObjRef instance will reference.</param>
/// <param name="requestedType"></param>
public CrossAppDomainObjRef(CrossAppDomainObject instance, Type requestedType)
: base(instance, requestedType)
{
//Proxy created locally (not remoted), the finalizer is meaningless.
GC.SuppressFinalize(this);
}
/// <summary>
/// Initializes a new instance of the System.Runtime.Remoting.ObjRef class from
/// serialized data.
/// </summary>
/// <param name="info">The object that holds the serialized object data.</param>
/// <param name="context">The contextual information about the source or destination of the exception.</param>
private CrossAppDomainObjRef(SerializationInfo info, StreamingContext context)
: base(info, context)
{
Debug.Assert(context.State == StreamingContextStates.CrossAppDomain);
Debug.Assert(IsFromThisProcess());
Debug.Assert(IsFromThisAppDomain() == false);
//Increment ref counter
CrossAppDomainObject remoteObject = (CrossAppDomainObject)GetRealObject(new StreamingContext(StreamingContextStates.CrossAppDomain));
remoteObject.AppDomainConnect();
}
/// <summary>
/// Disconnects the remote object.
/// </summary>
~CrossAppDomainObjRef()
{
Debug.Assert(IsFromThisProcess());
Debug.Assert(IsFromThisAppDomain() == false);
//Decrement ref counter
CrossAppDomainObject remoteObject = (CrossAppDomainObject)GetRealObject(new StreamingContext(StreamingContextStates.CrossAppDomain));
remoteObject.AppDomainDisconnect();
}
/// <summary>
/// Populates a specified System.Runtime.Serialization.SerializationInfo with
/// the data needed to serialize the current System.Runtime.Remoting.ObjRef instance.
/// </summary>
/// <param name="info">The System.Runtime.Serialization.SerializationInfo to populate with data.</param>
/// <param name="context">The contextual information about the source or destination of the serialization.</param>
public override void GetObjectData(SerializationInfo info, StreamingContext context)
{
Debug.Assert(context.State == StreamingContextStates.CrossAppDomain);
base.GetObjectData(info, context);
info.SetType(typeof(CrossAppDomainObjRef));
}
}
//
///存储生成代理以与远程对象通信所需的所有相关信息。
///在本地主机(客户端)上完成时断开远程对象(服务器)的连接。
///
[可序列化]
[EditorBrowsable(EditorBrowsableState.Never)]
公共密封类CrossAppDomainObjRef:ObjRef
{
///
///将CrossAppDomainObjRef类的新实例初始化为
///引用指定System.Type的指定CrossAppDomainObject。
///
///新System.Runtime.Remoting.ObjRef实例将引用的对象。
///
公共CrossAppDomainObjRef(CrossAppDomainObject实例,类型requestedType)
:base(实例,requestedType)
{
//本地创建的代理(非远程),终结器没有意义。
总干事(本);
}
///
///从初始化System.Runtime.Remoting.ObjRef类的新实例
///序列化数据。
///
///保存序列化对象数据的对象。
///有关异常源或目标的上下文信息。
私有CrossAppDomainObjRef(SerializationInfo信息,StreamingContext上下文)
:base(信息、上下文)
{
Assert(context.State==streamingContextState.CrossAppDomain);
Assert(IsFromThisProcess());
Assert(IsFromThisAppDomain()==false);
//增量参考计数器
CrossAppDomainObject remoteObject=(CrossAppDomainObject)GetRealObject(新StreamingContext(StreamingContextState.CrossAppDomain));
remoteObject.AppDomainConnect();
}
///
///断开远程对象的连接。
///
~CrossAppDomainObjRef()
{
Assert(IsFromThisProcess());
Assert(IsFromThisAppDomain()==false);
//减量参考计数器
CrossAppDomainObject remoteObject=(CrossAppDomainObject)GetRealObject(新StreamingContext(StreamingContextState.CrossAppDomain));
remoteObject.AppDomainDisconnect();
}
///
///将指定的System.Runtime.Serialization.SerializationInfo填充为
///序列化当前System.Runtime.Remoting.ObjRef实例所需的数据。
///
///要使用数据填充的System.Runtime.Serialization.SerializationInfo。
///有关序列化的源或目标的上下文信息。
公共覆盖无效GetObjectData(SerializationInfo、StreamingContext上下文)
{
Assert(context.State==streamingContextState.CrossAppDomain);
base.GetObjectData(信息、上下文);
info.SetType(typeof(CrossAppDomainObjRef));
}
}
现在是CrossAppDomainObject,您的远程对象必须继承自该类,而不是MarshalByRefObject
/// <summary>
/// Enables access to objects across application domain boundaries.
/// Contrary to MarshalByRefObject, the lifetime is managed by the client.
/// </summary>
public abstract class CrossAppDomainObject : MarshalByRefObject
{
/// <summary>
/// Count of remote references to this object.
/// </summary>
[NonSerialized]
private int refCount;
/// <summary>
/// Creates an object that contains all the relevant information required to
/// generate a proxy used to communicate with a remote object.
/// </summary>
/// <param name="requestedType">The System.Type of the object that the new System.Runtime.Remoting.ObjRef will reference.</param>
/// <returns>Information required to generate a proxy.</returns>
[EditorBrowsable(EditorBrowsableState.Never)]
public sealed override ObjRef CreateObjRef(Type requestedType)
{
CrossAppDomainObjRef objRef = new CrossAppDomainObjRef(this, requestedType);
return objRef;
}
/// <summary>
/// Disables LifeTime service : object has an infinite life time until it's Disconnected.
/// </summary>
/// <returns>null.</returns>
[EditorBrowsable(EditorBrowsableState.Never)]
public sealed override object InitializeLifetimeService()
{
return null;
}
/// <summary>
/// Connect a proxy to the object.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public void AppDomainConnect()
{
int value = Interlocked.Increment(ref refCount);
Debug.Assert(value > 0);
}
/// <summary>
/// Disconnects a proxy from the object.
/// When all proxy are disconnected, the object is disconnected from RemotingServices.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public void AppDomainDisconnect()
{
Debug.Assert(refCount > 0);
if (Interlocked.Decrement(ref refCount) == 0)
RemotingServices.Disconnect(this);
}
}
//
///允许跨应用程序域边界访问对象。
///与MarshalByRefObject相反,生存期由客户端管理。
///
公共抽象类CrossAppDomainObject:MarshalByRefObject
{
///
///对此对象的远程引用计数。
///
[非串行化]
私人int refCount;
///
///创建包含所需的所有相关信息的对象
///生成用于与远程对象通信的代理。
///
///新System.Runtime.Remoting.ObjRef将引用的对象的System.Type。
///生成代理所需的信息。
[EditorBrowsable(EditorBrowsableState.Never)]
公共密封覆盖ObjRef CreateObjRef(类型requestedType)
{
CrossAppDomainObjRef objRef=新的CrossAppDomainObjRef(此,requestedType);
返回objRef;
}
///
///禁用生存期服务:对象在断开连接之前有无限的生存期。
///
///空。
[EditorBrowsable(EditorBrowsableState.Never)]
公共密封覆盖对象初始化ElifetimeService()
{
返回null;
}
///
///将代理连接到对象。
///
[EditorBrowsable(EditorBrowsableState.Never)]
public void AppDomainConnect()
{
int值=联锁增量(参考计数);
断言(值>0);
}
///
///断开代理与对象的连接。
///断开所有代理连接后,对象将与远程服务断开连接。
///
[EditorBrowsable(EditorBrowsableState.Never)]
public void AppDomainDisconnect()
{
断言(refCount>0);
if(联锁减量(参考计数)==0)
远程服务。断开(此);
}
}
不幸的是,当AppDomains用于插件目的时,此解决方案是错误的(插件程序集不得加载到主appdomain中)
GetRealObject()是ca
[SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.Infrastructure)]
public override object InitializeLifetimeService()
{
return null;
}
[SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.Infrastructure)]
public override object InitializeLifetimeService()
{
return null;
}
public class MarshalByRefObjectPermanent : MarshalByRefObject
{
public override object InitializeLifetimeService()
{
return null;
}
~MarshalByRefObjectPermanent()
{
RemotingServices.Disconnect(this);
}
}
public static class MyClientClass
{
private static MarshalByRefObject remoteClass;
static MyClientClass()
{
CreateRemoteInstance();
}
// ...
public static void DoStuff()
{
// Before doing stuff, check if the remote object is still reachable
try {
remoteClass.GetLifetimeService();
}
catch(RemotingException) {
CreateRemoteInstance(); // Re-create remote instance
}
// Now we are sure the remote class is reachable
// Do actual stuff ...
}
private static void CreateRemoteInstance()
{
remoteClass = (MarshalByRefObject)AppDomain.CurrentAppDomain.CreateInstanceFromAndUnwrap(remoteClassPath, typeof(MarshalByRefObject).FullName);
}
}
class MyMarshaledObject : MarshalByRefObject
{
public bool DoSomethingRemote()
{
// ... execute some code remotely ...
return true;
}
[SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.Infrastructure)]
public override object InitializeLifetimeService()
{
return null;
}
}
using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Remoting.Lifetime;
namespace RemotingSamples
{
class HelloClient
{
static void Main()
{
// Register a channel.
TcpChannel myChannel = new TcpChannel ();
ChannelServices.RegisterChannel(myChannel);
RemotingConfiguration.RegisterActivatedClientType(
typeof(HelloService),"tcp://localhost:8085/");
// Get the remote object.
HelloService myService = new HelloService();
// Get a sponsor for renewal of time.
ClientSponsor mySponsor = new ClientSponsor();
// Register the service with sponsor.
mySponsor.Register(myService);
// Set renewaltime.
mySponsor.RenewalTime = TimeSpan.FromMinutes(2);
// Renew the lease.
ILease myLease = (ILease)mySponsor.InitializeLifetimeService();
TimeSpan myTime = mySponsor.Renewal(myLease);
Console.WriteLine("Renewed time in minutes is " + myTime.Minutes.ToString());
// Call the remote method.
Console.WriteLine(myService.HelloMethod("World"));
// Unregister the channel.
mySponsor.Unregister(myService);
mySponsor.Close();
}
}
}