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Esempio di .NET Remoting Servizio di rilevamento

  • Articolo

La classe TrackingServices fornisce un servizio di rilevamento generale con gestori di rilevamento collegabili. I metodi sull'interfaccia ITrackingHandler vengono chiamati nelle seguenti circostanze:

  • Un oggetto ObjRef è stato generato (come risultato di un'operazione di marshalling).

  • Un ObjRef è stato ricevuto (come risultato di un unmarshal).

  • Un oggetto è stato disconnesso.

Per informazioni dettagliate, vedere TrackingServices e ITrackingHandler nella documentazione di riferimento.

Caution noteAttenzione:

.NET Framework Remoting non esegue l'autenticazione o la crittografia per impostazione predefinita. È pertanto consigliato che vengano effettuati tutti i passaggi necessari per assicurarsi dell'identità di client o server prima di interagirvi in modalità remota. Poiché le applicazioni di .NET Framework Remoting richiedono autorizzazioni di tipo FullTrust per essere eseguite, se si concede l'accesso al proprio server a un client non autorizzato, questi potrebbe eseguire codice come se fosse completamente attendibile. Autenticare sempre gli endpoint e crittografare i flussi di comunicazione eseguendo l'hosting dei tipi remoti in Internet Information Services (IIS) o compilando una coppia di sink di canale personalizzata per eseguire questo lavoro.

Per compilare ed eseguire l'esempio

  1. Copiare tutti i file in una directory.

  2. Al prompt dei comandi, digitare i comandi seguenti:

    vbc /t:library /r:System.Runtime.Remoting.dll TrackingHandler.vb
vbc /t:library /r:System.Runtime.Remoting.dll RemoteType.vb
vbc /r:RemoteType.dll /r:System.Runtime.Remoting.dll /r:TrackingHandler.dll server.vb
vbc /r:RemoteType.dll /r:System.Runtime.Remoting.dll client.vb

csc /t:library /r:System.Runtime.Remoting.dll TrackingHandler.cs
csc /t:library /r:System.Runtime.Remoting.dll RemoteType.cs
csc /r:RemoteType.dll /r:System.Runtime.Remoting.dll /r:TrackingHandler.dll server.cs
csc /r:RemoteType.dll /r:System.Runtime.Remoting.dll client.cs

Questa applicazione è in esecuzione su un solo computer o attraverso una rete. Se si desidera eseguire questa applicazione su una rete, è necessario sostituire "localhost" nella configurazione client con il nome del computer remoto.

TrackingHandler

Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels
Imports System.Runtime.Remoting.Services

Public Class TrackingHandler
    Implements ITrackingHandler

    ' Notifies a handler that an object has been marshaled.
    Public Sub MarshaledObject(ByVal obj As Object, ByVal objref As System.Runtime.Remoting.ObjRef) Implements System.Runtime.Remoting.Services.ITrackingHandler.MarshaledObject
        Console.WriteLine("Tracking: An instance of {0} was marshaled. The instance HashCode is: {1}", _
            obj.ToString(), obj.GetHashCode().ToString())
        Console.WriteLine("ObjRef dump:")
        If (objref.ChannelInfo IsNot Nothing) Then
            Console.WriteLine("  -- ChannelInfo: ")
            DumpChannelInfo(objref.ChannelInfo)
        End If

        If (objref.EnvoyInfo IsNot Nothing) Then
            Console.WriteLine("  -- EnvoyInfo: " + CType(objref.EnvoyInfo, Object).ToString())
        End If
        If (objref.TypeInfo IsNot Nothing) Then
            Console.WriteLine("  -- TypeInfo: " + CType(objref.TypeInfo, Object).ToString())
            Console.WriteLine("      -- " + objref.TypeInfo.TypeName)
        End If
        If (objref.URI IsNot Nothing) Then
            Console.WriteLine("  -- URI: " + objref.URI.ToString())
        End If
    End Sub

    Private Sub DumpChannelInfo(ByVal info As IChannelInfo)
        Dim obj As Object
        For Each obj In info.ChannelData
            If (obj Is GetType(ChannelDataStore)) Then
                Dim uri As String
                For Each uri In CType(obj, ChannelDataStore).ChannelUris
                    Console.WriteLine("      -- ChannelUris:" + uri)
                Next
            End If
        Next

    End Sub

    ' Notifies a handler that an object has been unmarshaled.
    Public Sub UnmarshaledObject(ByVal obj As Object, ByVal [or] As System.Runtime.Remoting.ObjRef) Implements System.Runtime.Remoting.Services.ITrackingHandler.UnmarshaledObject
        Console.WriteLine("Tracking: An instance of {0} was unmarshaled. The instance HashCode is: {1}", obj.ToString(), obj.GetHashCode().ToString())
    End Sub

    ' Notifies a handler that an object has been disconnected.
    Public Sub DisconnectedObject(ByVal obj As Object) Implements System.Runtime.Remoting.Services.ITrackingHandler.DisconnectedObject
        Console.WriteLine("Tracking: An instance of {0} was disconnected. The instance HashCode is: {1}", obj.ToString(), obj.GetHashCode().ToString())
    End Sub
End Class

using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Services;

namespace TrackingHandler
{
    public class TrackingHandler : ITrackingHandler
    {
        // Notifies a handler that an object has been marshaled.
        public void MarshaledObject(Object obj, ObjRef objref)
        {
            Console.WriteLine("Tracking: An instance of {0} was marshaled. The instance HashCode is: {1}", obj.ToString(), obj.GetHashCode().ToString());
            Console.WriteLine("ObjRef dump:");
            if (objref.ChannelInfo != null)
            {
                Console.WriteLine("  -- ChannelInfo: ");
                DumpChannelInfo(objref.ChannelInfo);
            }
            if (objref.EnvoyInfo != null)
                Console.WriteLine("  -- EnvoyInfo: " + objref.EnvoyInfo.ToString());
            if (objref.TypeInfo != null)
            {
                Console.WriteLine("  -- TypeInfo: " + objref.TypeInfo.ToString());
                Console.WriteLine("      -- " + objref.TypeInfo.TypeName);
            }
            if (objref.URI != null)
                Console.WriteLine("  -- URI: " + objref.URI.ToString());
        }

        private void DumpChannelInfo(IChannelInfo info)
        {

            foreach (object obj in info.ChannelData)
            {
                if (obj is ChannelDataStore)
                {
                    foreach (string uri in ((ChannelDataStore)obj).ChannelUris)
                        Console.WriteLine("      -- ChannelUris:" + uri);
                }
            }
        }

        // Notifies a handler that an object has been unmarshaled.
        public void UnmarshaledObject(Object obj, ObjRef or)
        {
            Console.WriteLine("Tracking: An instance of {0} was unmarshaled. The instance HashCode is: {1}", obj.ToString(), obj.GetHashCode().ToString());
        }

        // Notifies a handler that an object has been disconnected.
        public void DisconnectedObject(Object obj)
        {
            Console.WriteLine("Tracking: An instance of {0} was disconnected. The instance HashCode is: {1}", 
                obj.ToString(), obj.GetHashCode().ToString());
        }
    }
}

RemoteType

Imports System

Public Class ServiceClass
    Inherits MarshalByRefObject

    Private starttime As DateTime

    Public Sub New()
        Console.WriteLine("A ServiceClass has been created.")
        starttime = DateTime.Now
    End Sub

    Protected Overrides Sub Finalize()
        Console.WriteLine("ServiceClass being collected after " & (New TimeSpan(DateTime.Now.Ticks - starttime.Ticks)).ToString() & " seconds.")
    End Sub

    Public Function GetServerTime() As DateTime
        Console.WriteLine("Time requested by client")
        Return DateTime.Now
    End Function
End Class

using System;

namespace RemoteType
{
    public class ServiceClass : MarshalByRefObject
    {
        private DateTime starttime;

        public ServiceClass()
        {
            Console.WriteLine("A ServiceClass has been created.");
            starttime = DateTime.Now;
        }

        ~ServiceClass()
        {
            Console.WriteLine("ServiceClass being collected after " + (new TimeSpan(DateTime.Now.Ticks - starttime.Ticks)).ToString() + " seconds.");
        }

        public DateTime GetServerTime()
        {
            Console.WriteLine("Time requested by client.");
            return DateTime.Now;
        }
    }
}

Server

[Visual Basic]

Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels
Imports System.Runtime.Remoting.Channels.Tcp
Imports System.Runtime.Remoting.Services
Imports TrackingHandler

Public Class Server
    Public Shared Sub Main()
        Dim channel As TcpChannel = New TcpChannel(8080)
        ChannelServices.RegisterChannel(channel, False)

        TrackingServices.RegisterTrackingHandler(New TrackingHandler())

        Dim service As ServiceClass = New ServiceClass()
        Dim obj As ObjRef = RemotingServices.Marshal(service, "TcpService")

        Console.WriteLine("Press Enter to unmarshal the object.")
        Console.ReadLine()

        RemotingServices.Unmarshal(obj)

        Console.WriteLine("Press Enter to disconnect the object.")
        Console.ReadLine()

        RemotingServices.Disconnect(service)
    End Sub
End Class

[C#]

using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Remoting.Services;
using TrackingHandler;
using RemoteType;

namespace Server
{
    public class Server
    {
        public static void Main(string[] Args)
        {
            TcpChannel channel = new TcpChannel(8080);
            ChannelServices.RegisterChannel(channel, false);

            TrackingServices.RegisterTrackingHandler(new TrackingHandler.TrackingHandler());

            ServiceClass service = new ServiceClass();
            ObjRef obj = RemotingServices.Marshal(service, "TcpService");

            Console.WriteLine("\r\nPress Enter to unmarshal the object.");
            Console.ReadLine();

            RemotingServices.Unmarshal(obj);

            Console.WriteLine("Press Enter to disconnect the object.");
            Console.ReadLine();

            RemotingServices.Disconnect(service);
        }
    }
}

Client

Imports System
Imports System.Runtime.Remoting
Imports System.Runtime.Remoting.Channels
Imports System.Runtime.Remoting.Channels.Tcp

Public Class Client

    Public Shared Sub Main()
        ChannelServices.RegisterChannel(New TcpChannel(), False)

        Dim remotetype As WellKnownClientTypeEntry = New WellKnownClientTypeEntry( _
            GetType(ServiceClass), _
            "tcp://localhost:8080/TcpService")
        RemotingConfiguration.RegisterWellKnownClientType(remotetype)

        Dim service As ServiceClass = New ServiceClass()
        Console.WriteLine("Server time is: " & service.GetServerTime().ToLongTimeString())
    End Sub

End Class

using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using RemoteType;

namespace Client
{
    public class ClientProcess
    {
        public static void Main(string[] Args)
        {
            ChannelServices.RegisterChannel(new TcpChannel(), false);

            WellKnownClientTypeEntry remotetype = new WellKnownClientTypeEntry(
                typeof(ServiceClass), 
                "tcp://localhost:8080/TcpService");
            RemotingConfiguration.RegisterWellKnownClientType(remotetype);

            ServiceClass service = new ServiceClass();
            Console.WriteLine("Server time is: " + service.GetServerTime().ToLongTimeString());
        }
    }
}

Vedere anche

Riferimenti

ITrackingHandler
TrackingServices

Altre risorse

Esempi di .NET Remoting

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