RedirectionProxy.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Runtime / Remoting / RedirectionProxy.cs / 1 / RedirectionProxy.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// File: RedirectionProxy.cs
 
using System; 
using System.Runtime.InteropServices;
using System.Runtime.Remoting.Messaging; 
using System.Runtime.Remoting.Proxies;


namespace System.Runtime.Remoting 
{
 
    internal class RedirectionProxy : MarshalByRefObject, IMessageSink 
    {
        private MarshalByRefObject _proxy; 
        private RealProxy _realProxy;
        private Type _serverType;
        private WellKnownObjectMode _objectMode;
 
        internal RedirectionProxy(MarshalByRefObject proxy, Type serverType)
        { 
            _proxy = proxy; 
            _realProxy = RemotingServices.GetRealProxy(_proxy);
            _serverType = serverType; 
            _objectMode = WellKnownObjectMode.Singleton;
        } // RedirectionProxy

 
        public WellKnownObjectMode ObjectMode
        { 
            set { _objectMode = value; } 
        } // ObjectMode
 
        public virtual IMessage SyncProcessMessage(IMessage msg)
        {
            IMessage replyMsg = null;
 
            try
            { 
                msg.Properties["__Uri"] = _realProxy.IdentityObject.URI; 

                if (_objectMode == WellKnownObjectMode.Singleton) 
                {
                    replyMsg = _realProxy.Invoke(msg);
                }
                else 
                {
                    // This is a single call object, so we need to create 
                    // a new instance. 
                    MarshalByRefObject obj = (MarshalByRefObject)Activator.CreateInstance(_serverType, true);
                    BCLDebug.Assert(RemotingServices.IsTransparentProxy(obj), "expecting a proxy"); 

                    RealProxy rp = RemotingServices.GetRealProxy(obj);
                    replyMsg = rp.Invoke(msg);
                } 
            }
            catch (Exception e) 
            { 
                replyMsg = new ReturnMessage(e, msg as IMethodCallMessage);
            } 

            return replyMsg;
        } // SyncProcessMessage
 

        public virtual IMessageCtrl AsyncProcessMessage(IMessage msg, IMessageSink replySink) 
        { 
            // <
 


            IMessage replyMsg = null;
 
            replyMsg = SyncProcessMessage(msg);
 
            if (replySink != null) 
                replySink.SyncProcessMessage(replyMsg);
 
            return null;
        } // AsyncProcessMessage

        public IMessageSink NextSink { get { return null; } } 

    } // class RedirectionProxy 
 

 
    // This is only to be used for wellknown Singleton COM objects.
    internal class ComRedirectionProxy : MarshalByRefObject, IMessageSink
    {
        private MarshalByRefObject _comObject; 
        private Type _serverType;
 
        internal ComRedirectionProxy(MarshalByRefObject comObject, Type serverType) 
        {
            BCLDebug.Assert(serverType.IsCOMObject, "This must be a COM object type."); 

            _comObject = comObject;
            _serverType = serverType;
        } // ComRedirectionProxy 

 
        public virtual IMessage SyncProcessMessage(IMessage msg) 
        {
            IMethodCallMessage mcmReqMsg = (IMethodCallMessage)msg; 
            IMethodReturnMessage replyMsg = null;

            replyMsg = RemotingServices.ExecuteMessage(_comObject, mcmReqMsg);
 
            if (replyMsg != null)
            { 
                // If an "RPC server not available" (HRESULT=0x800706BA) COM 
                //   exception is thrown, we will try to recreate the object once.
                const int RPC_S_SERVER_UNAVAILABLE = unchecked((int)0x800706BA); 
                const int RPC_S_CALL_FAILED_DNE    = unchecked((int)0x800706BF);
                COMException comException = replyMsg.Exception as COMException;
                if ((comException != null) &&
                    ((comException._HResult == RPC_S_SERVER_UNAVAILABLE) || 
                     (comException._HResult == RPC_S_CALL_FAILED_DNE)))
                { 
                    _comObject = (MarshalByRefObject)Activator.CreateInstance(_serverType, true); 

                    replyMsg = RemotingServices.ExecuteMessage(_comObject, mcmReqMsg); 
                }
            }

            return replyMsg; 
        } // SyncProcessMessage
 
 
        public virtual IMessageCtrl AsyncProcessMessage(IMessage msg, IMessageSink replySink)
        { 
            // <


 
            IMessage replyMsg = null;
 
            replyMsg = SyncProcessMessage(msg); 

            if (replySink != null) 
                replySink.SyncProcessMessage(replyMsg);

            return null;
        } // AsyncProcessMessage 

        public IMessageSink NextSink { get { return null; } } 
 
    } // class ComRedirectionProxy
 

} // namespace System.Runtime.Remoting

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