[英]How to know whether a class method was called internally or remotely in .NET Remoting?
我有一个类,当通过.Net远程调用远程调用时需要表现不同。 在课堂上,如何确定是否属于这种情况?
class RemoteClass : MarshalByRefObject
{
public void SomeMethod ()
{
if (ConditionWhatINeed) //If this method was called internally/remotely
{
//Do one stuff
}
else
{
//Do another suff
}
}
您可能想要查看RemotingServices.IsObjectOutOfContext方法 。 它也有一个你可能会觉得有用的例子。 当然,因为您将在'this'上调用此方法服务器端,它永远不会被视为远程处理对象,但是如果您向方法添加一个参数,那么该参数将在本地上下文中,如果不进行远程处理和远程处理时的上下文(PS这是我帐户未经证实的假设)。 另一个有用的帮助器可能是RemotingServices.IsTransparentProxy方法 。
可能有一种方法使用System.Runtime.Remoting
层次结构下的*Services
对象之一,如mtijn所示。 但是,对象模型中存在深层问题。 对物体负有双重责任是不好的做法,难以维护和难以理解。 为什么不公开专用的“远程”对象; 以下示例演示了它:
class Program
{
static void Main(string[] args)
{
InitializeRemoting();
var remote = GetRemotingObject("localhost");
var local = new LocalClass();
remote.SomeMethod();
local.SomeMethod();
Console.ReadLine();
}
static void InitializeRemoting()
{
var c = new TcpServerChannel(9000);
ChannelServices.RegisterChannel(c, false);
WellKnownServiceTypeEntry entry = new WellKnownServiceTypeEntry
(
typeof(RemoteClass),
"LocalClass", // Lie about the object name.
WellKnownObjectMode.Singleton
);
RemotingConfiguration.RegisterWellKnownServiceType(entry);
}
static LocalClass GetRemotingObject(string serverName)
{
TcpClientChannel channel = new TcpClientChannel("tcp-client", new BinaryClientFormatterSinkProvider());
ChannelServices.RegisterChannel(channel, false);
return (LocalClass)Activator.GetObject
(
typeof(LocalClass), // Remoting will happily cast it to a type we have access to.
string.Format("tcp://{0}:9000/LocalClass", serverName)
);
}
}
public class LocalClass : MarshalByRefObject
{
public void SomeMethod()
{
OnSomeMethod();
}
protected virtual void OnSomeMethod()
{
// Method called locally.
Console.WriteLine("Local!");
}
}
// Note that we don't need to (and probably shouldn't) expose the remoting type publicly.
class RemoteClass : LocalClass
{
protected override void OnSomeMethod()
{
// Method called remotely.
Console.WriteLine("Remote!");
}
}
// Output:
// Remote!
// Local!
编辑:直接回答你的问题,即使你想要实现的是不好的做法,重复我的代码,只需提供一个virtual bool IsLocal { get { return true; } }
virtual bool IsLocal { get { return true; } }
在本地类并覆盖其上的远程类。 然后,您可以在if语句中使用该属性。
编辑:如果您的服务器和您的客户端需要共享完全相同的类实例,您应该使用Facade模式 。 例如:
class CommonImplementation
{
public static readonly CommonImplementation Instance = new CommonImplementation();
private CommonImplementation() { }
public void SomeMethod(string someArg, bool isServerCall)
{
if (isServerCall)
{
Console.WriteLine("Remote! {0}", someArg);
}
else
{
Console.WriteLine("Local! {0}", someArg);
}
}
}
// These two classes are the facade.
public class LocalClass : MarshalByRefObject
{
public virtual void SomeMethod(string someArg)
{
CommonImplementation.Instance.SomeMethod(someArg, false);
}
}
class RemoteClass : LocalClass
{
public override void SomeMethod(string someArg)
{
CommonImplementation.Instance.SomeMethod(someArg, true);
}
}
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