public void HandleMethodCall (MethodCall method_call)
		{
			Type type = obj.GetType ();
			//object retObj = type.InvokeMember (msg.Member, BindingFlags.InvokeMethod, null, obj, MessageHelper.GetDynamicValues (msg));

			//TODO: there is no member name mapping for properties etc. yet
			MethodInfo mi = Mapper.GetMethod (type, method_call);

			if (mi == null) {
				conn.MaybeSendUnknownMethodError (method_call);
				return;
			}

			object retObj = null;
			try {
				object[] inArgs = MessageHelper.GetDynamicValues (method_call.message, mi.GetParameters ());
				retObj = mi.Invoke (obj, inArgs);
			} catch (TargetInvocationException e) {
				if (!method_call.message.ReplyExpected)
					return;

				Exception ie = e.InnerException;
				//TODO: complete exception sending support

				Error error = new Error (Mapper.GetInterfaceName (ie.GetType ()), method_call.message.Header.Serial);
				error.message.Signature = new Signature (DType.String);

				MessageWriter writer = new MessageWriter (Connection.NativeEndianness);
				writer.connection = conn;
				writer.Write (ie.Message);
				error.message.Body = writer.ToArray ();

				//TODO: we should be more strict here, but this fallback was added as a quick fix for p2p
				if (method_call.Sender != null)
					error.message.Header.Fields[FieldCode.Destination] = method_call.Sender;

				conn.Send (error.message);
				return;
			}

			if (method_call.message.ReplyExpected) {
				/*
				object[] retObjs;

				if (retObj == null) {
					retObjs = new object[0];
				} else {
					retObjs = new object[1];
					retObjs[0] = retObj;
				}

				Message reply = ConstructReplyFor (method_call, retObjs);
				*/
				Message reply = MessageHelper.ConstructReplyFor (method_call, mi.ReturnType, retObj);
				conn.Send (reply);
			}
		}
Exemplo n.º 2
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		//this method walks the interface tree in an undefined manner and returns the first match, or if no matches are found, null
		//the logic needs review and cleanup
		//TODO: unify member name mapping as is already done with interfaces and args
		public static MethodInfo GetMethod (Type type, MethodCall method_call)
		{
			foreach (MemberInfo member in Mapper.GetPublicMembers (type)) {
				//this could be made more efficient by using the given interface name earlier and avoiding walking through all public interfaces
				if (method_call.Interface != null)
					if (GetInterfaceName (member) != method_call.Interface)
						continue;

				MethodInfo meth = null;
				Type[] inTypes = null;

				if (member is PropertyInfo) {
					PropertyInfo prop = member as PropertyInfo;

					MethodInfo getter = prop.GetGetMethod (false);
					MethodInfo setter = prop.GetSetMethod (false);

					if (getter != null && "Get" + prop.Name == method_call.Member) {
						meth = getter;
						inTypes = Type.EmptyTypes;
					} else if (setter != null && "Set" + prop.Name == method_call.Member) {
						meth = setter;
						inTypes = new Type[] {prop.PropertyType};
					}
				} else {
					meth = member as MethodInfo;

					if (meth == null)
						continue;

					if (meth.Name != method_call.Member)
						continue;

					inTypes = Mapper.GetTypes (ArgDirection.In, meth.GetParameters ());
				}

				if (meth == null || inTypes == null)
					continue;

				Signature inSig = Signature.GetSig (inTypes);

				if (inSig != method_call.Signature)
					continue;

				return meth;
			}

			return null;
		}
        public virtual void HandleMethodCall(MethodCall method_call)
        {
            Type type = obj.GetType ();

            //object retObj = type.InvokeMember (msg.Member, BindingFlags.InvokeMethod, null, obj, MessageHelper.GetDynamicValues (msg));

            //TODO: there is no member name mapping for properties etc. yet

            // FIXME: Inefficient to do this on every call
            MethodInfo mi = Mapper.GetMethod (type, method_call);

            if (mi == null) {
                conn.MaybeSendUnknownMethodError (method_call);
                return;
            }

            MethodCaller2 mCaller;
            if (!mCallers.TryGetValue (mi, out mCaller)) {
                //mCaller = TypeImplementer.GenCaller (mi, obj);
                mCaller = TypeImplementer.GenCaller2 (mi);
                mCallers[mi] = mCaller;
            }

            Signature inSig, outSig;
            TypeImplementer.SigsForMethod (mi, out inSig, out outSig);

            Message msg = method_call.message;
            MessageReader msgReader = new MessageReader (method_call.message);
            MessageWriter retWriter = new MessageWriter ();

            /*
            MessageWriter retWriter = null;
            if (msg.ReplyExpected)
                retWriter = new MessageWriter ();
            */

            Exception raisedException = null;
            try {
                //mCaller (msgReader, method_call.message, retWriter);
                mCaller (obj, msgReader, method_call.message, retWriter);
            } catch (Exception e) {
                raisedException = e;
            }

            if (!msg.ReplyExpected)
                return;

            Message replyMsg;

            if (raisedException == null) {
                MethodReturn method_return = new MethodReturn (msg.Header.Serial);
                replyMsg = method_return.message;
                replyMsg.Body = retWriter.ToArray ();
                replyMsg.Signature = outSig;
            } else {
                Error error;
                // BusException allows precisely formatted Error messages.
                BusException busException = raisedException as BusException;
                if (busException != null)
                    error = method_call.CreateError (busException.ErrorName, busException.ErrorMessage);
                else if (raisedException is ArgumentException && raisedException.TargetSite.Name == mi.Name) {
                    // Name match trick above is a hack since we don't have the resolved MethodInfo.
                    ArgumentException argException = (ArgumentException)raisedException;
                    using (System.IO.StringReader sr = new System.IO.StringReader (argException.Message)) {
                        error = method_call.CreateError ("org.freedesktop.DBus.Error.InvalidArgs", sr.ReadLine ());
                    }
                } else
                    error = method_call.CreateError (Mapper.GetInterfaceName (raisedException.GetType ()), raisedException.Message);

                replyMsg = error.message;
            }

            if (method_call.Sender != null)
                replyMsg.Header[FieldCode.Destination] = method_call.Sender;

            conn.Send (replyMsg);
        }
Exemplo n.º 4
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		public static Message ConstructDynamicReply (MethodCall method_call, MethodInfo mi, object retVal, object[] vals)
		{
			Type retType = mi.ReturnType;

			MethodReturn method_return = new MethodReturn (method_call.message.Header.Serial);
			Message replyMsg = method_return.message;

			Signature outSig = Signature.GetSig (retType);
			outSig += Signature.GetSig (Mapper.GetTypes (ArgDirection.Out, mi.GetParameters ()));

			if (outSig != Signature.Empty) {
				MessageWriter writer = new MessageWriter (Connection.NativeEndianness);

				//first write the return value, if any
				if (retType != null && retType != typeof (void))
					writer.Write (retType, retVal);

				//then write the out args
				WriteDynamicValues (writer, mi.GetParameters (), vals);

				replyMsg.Body = writer.ToArray ();
			}

			//TODO: we should be more strict here, but this fallback was added as a quick fix for p2p
			if (method_call.Sender != null)
				replyMsg.Header.Fields[FieldCode.Destination] = method_call.Sender;

			replyMsg.Signature = outSig;

			return replyMsg;
		}
Exemplo n.º 5
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		public static Message ConstructReply (MethodCall method_call, params object[] vals)
		{
			MethodReturn method_return = new MethodReturn (method_call.message.Header.Serial);
			Message replyMsg = method_return.message;

			Signature inSig = Signature.GetSig (vals);

			if (vals != null && vals.Length != 0) {
				MessageWriter writer = new MessageWriter (Connection.NativeEndianness);

				foreach (object arg in vals)
					writer.Write (arg.GetType (), arg);

				replyMsg.Body = writer.ToArray ();
			}

			//TODO: we should be more strict here, but this fallback was added as a quick fix for p2p
			if (method_call.Sender != null)
				replyMsg.Header.Fields[FieldCode.Destination] = method_call.Sender;

			replyMsg.Signature = inSig;

			//replyMsg.WriteHeader ();

			return replyMsg;
		}
Exemplo n.º 6
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		public static Message CreateUnknownMethodError (MethodCall method_call)
		{
			if (!method_call.message.ReplyExpected)
				return null;

			string errMsg = String.Format ("Method \"{0}\" with signature \"{1}\" on interface \"{2}\" doesn't exist", method_call.Member, method_call.Signature.Value, method_call.Interface);

			Error error = new Error ("org.freedesktop.DBus.Error.UnknownMethod", method_call.message.Header.Serial);
			error.message.Signature = new Signature (DType.String);

			MessageWriter writer = new MessageWriter (Connection.NativeEndianness);
			writer.Write (errMsg);
			error.message.Body = writer.ToArray ();

			//TODO: we should be more strict here, but this fallback was added as a quick fix for p2p
			if (method_call.Sender != null)
				error.message.Header.Fields[FieldCode.Destination] = method_call.Sender;

			return error.message;
		}
Exemplo n.º 7
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		public object SendMethodCall (string iface, string member, string inSigStr, MessageWriter writer, Type retType, out Exception exception)
		{
			exception = null;

			//TODO: don't ignore retVal, exception etc.

			Signature inSig = String.IsNullOrEmpty (inSigStr) ? Signature.Empty : new Signature (inSigStr);

			MethodCall method_call = new MethodCall (object_path, iface, member, bus_name, inSig);

			Message callMsg = method_call.message;
			callMsg.Body = writer.ToArray ();

			//Invoke Code::

			//TODO: complete out parameter support
			/*
			Type[] outParmTypes = Mapper.GetTypes (ArgDirection.Out, mi.GetParameters ());
			Signature outParmSig = Signature.GetSig (outParmTypes);

			if (outParmSig != Signature.Empty)
				throw new Exception ("Out parameters not yet supported: out_signature='" + outParmSig.Value + "'");
			*/

			Type[] outTypes = new Type[1];
			outTypes[0] = retType;

			//we default to always requiring replies for now, even though unnecessary
			//this is to make sure errors are handled synchronously
			//TODO: don't hard code this
			bool needsReply = true;

			//if (mi.ReturnType == typeof (void))
			//	needsReply = false;

			callMsg.ReplyExpected = needsReply;
			callMsg.Signature = inSig;

			if (!needsReply) {
				conn.Send (callMsg);
				return null;
			}

#if PROTO_REPLY_SIGNATURE
			if (needsReply) {
				Signature outSig = Signature.GetSig (outTypes);
				callMsg.Header.Fields[FieldCode.ReplySignature] = outSig;
			}
#endif

			Message retMsg = conn.SendWithReplyAndBlock (callMsg);

			object retVal = null;

			//handle the reply message
			switch (retMsg.Header.MessageType) {
				case MessageType.MethodReturn:
				object[] retVals = MessageHelper.GetDynamicValues (retMsg, outTypes);
				if (retVals.Length != 0)
					retVal = retVals[retVals.Length - 1];
				break;
				case MessageType.Error:
				//TODO: typed exceptions
				Error error = new Error (retMsg);
				string errMsg = String.Empty;
				if (retMsg.Signature.Value.StartsWith ("s")) {
					MessageReader reader = new MessageReader (retMsg);
					errMsg = reader.ReadString ();
				}
				exception = new Exception (error.ErrorName + ": " + errMsg);
				break;
				default:
				throw new Exception ("Got unexpected message of type " + retMsg.Header.MessageType + " while waiting for a MethodReturn or Error");
			}

			return retVal;
		}
Exemplo n.º 8
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		public void Invoke (MethodBase methodBase, string methodName, object[] inArgs, out object[] outArgs, out object retVal, out Exception exception)
		{
			outArgs = new object[0];
			retVal = null;
			exception = null;

			MethodInfo mi = methodBase as MethodInfo;

			if (mi != null && mi.IsSpecialName && (methodName.StartsWith ("add_") || methodName.StartsWith ("remove_"))) {
				string[] parts = methodName.Split (new char[]{'_'}, 2);
				string ename = parts[1];
				Delegate dlg = (Delegate)inArgs[0];

				ToggleSignal (Mapper.GetInterfaceName (mi), ename, dlg, parts[0] == "add");

				return;
			}

			Type[] inTypes = Mapper.GetTypes (ArgDirection.In, mi.GetParameters ());
			Signature inSig = Signature.GetSig (inTypes);

			MethodCall method_call;
			Message callMsg;

			//build the outbound method call message
			{
				//this bit is error-prone (no null checking) and will need rewriting when DProxy is replaced
				string iface = null;
				if (mi != null)
					iface = Mapper.GetInterfaceName (mi);

				//map property accessors
				//TODO: this needs to be done properly, not with simple String.Replace
				//note that IsSpecialName is also for event accessors, but we already handled those and returned
				if (mi != null && mi.IsSpecialName) {
					methodName = methodName.Replace ("get_", "Get");
					methodName = methodName.Replace ("set_", "Set");
				}

				method_call = new MethodCall (object_path, iface, methodName, bus_name, inSig);

				callMsg = method_call.message;

				if (inArgs != null && inArgs.Length != 0) {
					MessageWriter writer = new MessageWriter (Connection.NativeEndianness);
					writer.connection = conn;

					for (int i = 0 ; i != inTypes.Length ; i++)
						writer.Write (inTypes[i], inArgs[i]);

					callMsg.Body = writer.ToArray ();
				}
			}

			//TODO: complete out parameter support
			/*
			Type[] outParmTypes = Mapper.GetTypes (ArgDirection.Out, mi.GetParameters ());
			Signature outParmSig = Signature.GetSig (outParmTypes);

			if (outParmSig != Signature.Empty)
				throw new Exception ("Out parameters not yet supported: out_signature='" + outParmSig.Value + "'");
			*/

			Type[] outTypes = new Type[1];
			outTypes[0] = mi.ReturnType;

			//we default to always requiring replies for now, even though unnecessary
			//this is to make sure errors are handled synchronously
			//TODO: don't hard code this
			bool needsReply = true;

			//if (mi.ReturnType == typeof (void))
			//	needsReply = false;

			callMsg.ReplyExpected = needsReply;
			callMsg.Signature = inSig;

			if (!needsReply) {
				conn.Send (callMsg);
				return;
			}

#if PROTO_REPLY_SIGNATURE
			if (needsReply) {
				Signature outSig = Signature.GetSig (outTypes);
				callMsg.Header.Fields[FieldCode.ReplySignature] = outSig;
			}
#endif

			Message retMsg = conn.SendWithReplyAndBlock (callMsg);

			//handle the reply message
			switch (retMsg.Header.MessageType) {
				case MessageType.MethodReturn:
				object[] retVals = MessageHelper.GetDynamicValues (retMsg, outTypes);
				if (retVals.Length != 0)
					retVal = retVals[retVals.Length - 1];
				break;
				case MessageType.Error:
				//TODO: typed exceptions
				Error error = new Error (retMsg);
				string errMsg = String.Empty;
				if (retMsg.Signature.Value.StartsWith ("s")) {
					MessageReader reader = new MessageReader (retMsg);
					errMsg = reader.ReadString ();
				}
				exception = new Exception (error.ErrorName + ": " + errMsg);
				break;
				default:
				throw new Exception ("Got unexpected message of type " + retMsg.Header.MessageType + " while waiting for a MethodReturn or Error");
			}

			return;
		}
Exemplo n.º 9
0
		private void FetchUiaDbusNames ()
		{
			var busNames = new List<string> ();

			IBus ibus = Bus.Session.GetObject<IBus> (DBusName,
			                                         new ObjectPath (DBusPath));
			// Look for buses that contain DCI.IApplication
			foreach (string busName in ibus.ListNames ()) {
				// Reading introspection data hangs on some buses
				// for unknown reasons, so we call Introspect
				// asynchronously.  Note that we are using
				// internal dbus-sharp classes.  The old
				// behavior was to spin off threads, but this
				// triggers a Mono bug on Fedora
				// (BNC#628639/632133)
				ObjectPath op = new ObjectPath (DC.Constants.ApplicationPath);
				MethodCall methodCall = new MethodCall (op,
					"org.freedesktop.DBus.Introspectable",
					"Introspect", busName, Signature.Empty);
				PendingCall pendingCall = Bus.Session.SendWithReply (methodCall.message);
				pendingCall.Completed +=  (message) => {
					MessageReader reader = new MessageReader (message);
					string data = reader.ReadString ();
					if (data.Contains (DC.Constants.ApplicationInterfaceName))
						busNames.Add ((string)message.Header [FieldCode.Sender]);
				};
			}
			Thread.Sleep (1000);

			lock (uiaDbusNamesLock)
				uiaDbusNames = busNames;
		}
Exemplo n.º 10
0
		//TODO: merge this with the above method
		public static Message ConstructReplyFor (MethodCall method_call, Type retType, object retVal)
		{
			MethodReturn method_return = new MethodReturn (method_call.message.Header.Serial);
			Message replyMsg = method_return.message;

			Signature inSig = Signature.GetSig (retType);

			if (inSig != Signature.Empty) {
				MessageWriter writer = new MessageWriter (Connection.NativeEndianness);
				writer.Write (retType, retVal);
				replyMsg.Body = writer.ToArray ();
			}

			//TODO: we should be more strict here, but this fallback was added as a quick fix for p2p
			if (method_call.Sender != null)
				replyMsg.Header.Fields[FieldCode.Destination] = method_call.Sender;

			replyMsg.Signature = inSig;

			//replyMsg.WriteHeader ();

			return replyMsg;
		}
Exemplo n.º 11
0
        //this method walks the interface tree in an undefined manner and returns the first match, or if no matches are found, null
        //the logic needs review and cleanup
        //TODO: unify member name mapping as is already done with interfaces and args
        public static MethodInfo GetMethod(Type type, MethodCall method_call)
        {
            foreach (MemberInfo member in Mapper.GetPublicMembers(type))
            {
                //this could be made more efficient by using the given interface name earlier and avoiding walking through all public interfaces
                if (method_call.Interface != null)
                {
                    if (GetInterfaceName(member) != method_call.Interface)
                    {
                        continue;
                    }
                }

                MethodInfo meth    = null;
                Type[]     inTypes = null;

                if (member is PropertyInfo)
                {
                    PropertyInfo prop = member as PropertyInfo;

                    MethodInfo getter = prop.GetGetMethod(false);
                    MethodInfo setter = prop.GetSetMethod(false);

                    if (getter != null && "Get" + prop.Name == method_call.Member)
                    {
                        meth    = getter;
                        inTypes = Type.EmptyTypes;
                    }
                    else if (setter != null && "Set" + prop.Name == method_call.Member)
                    {
                        meth    = setter;
                        inTypes = new Type[] { prop.PropertyType };
                    }
                }
                else
                {
                    meth = member as MethodInfo;

                    if (meth == null)
                    {
                        continue;
                    }

                    if (meth.Name != method_call.Member)
                    {
                        continue;
                    }

                    inTypes = Mapper.GetTypes(ArgDirection.In, meth.GetParameters());
                }

                if (meth == null || inTypes == null)
                {
                    continue;
                }

                Signature inSig = Signature.GetSig(inTypes);

                if (inSig != method_call.Signature)
                {
                    continue;
                }

                return(meth);
            }

            return(null);
        }
Exemplo n.º 12
0
        //not particularly efficient and needs to be generalized
        internal void HandleMethodCall(MethodCall method_call)
        {
            //TODO: Ping and Introspect need to be abstracted and moved somewhere more appropriate once message filter infrastructure is complete

            //FIXME: these special cases are slightly broken for the case where the member but not the interface is specified in the message
            if (method_call.Interface == "org.freedesktop.DBus.Peer" && method_call.Member == "Ping")
            {
                Message reply = MessageHelper.ConstructReply(method_call);
                Send(reply);
                return;
            }

            if (method_call.Interface == "org.freedesktop.DBus.Introspectable" && method_call.Member == "Introspect")
            {
                Introspector intro = new Introspector();
                intro.root_path = method_call.Path;
                intro.WriteStart();

                //FIXME: do this properly
                //this is messy and inefficient
                List <string> linkNodes = new List <string> ();
                int           depth     = method_call.Path.Decomposed.Length;
                foreach (ObjectPath pth in RegisteredObjects.Keys)
                {
                    if (pth.Value == (method_call.Path.Value))
                    {
                        ExportObject exo = (ExportObject)RegisteredObjects[pth];
                        intro.WriteType(exo.obj.GetType());
                    }
                    else
                    {
                        for (ObjectPath cur = pth; cur != null; cur = cur.Parent)
                        {
                            if (cur.Value == method_call.Path.Value)
                            {
                                string linkNode = pth.Decomposed[depth];
                                if (!linkNodes.Contains(linkNode))
                                {
                                    intro.WriteNode(linkNode);
                                    linkNodes.Add(linkNode);
                                }
                            }
                        }
                    }
                }

                intro.WriteEnd();

                Message reply = MessageHelper.ConstructReply(method_call, intro.xml);
                Send(reply);
                return;
            }

            BusObject bo;

            if (RegisteredObjects.TryGetValue(method_call.Path, out bo))
            {
                ExportObject eo = (ExportObject)bo;
                eo.HandleMethodCall(method_call);
            }
            else
            {
                MaybeSendUnknownMethodError(method_call);
            }
        }
Exemplo n.º 13
0
        internal void HandleMessage(Message msg)
        {
            //TODO: support disconnection situations properly and move this check elsewhere
            if (msg == null)
            {
                throw new ArgumentNullException("msg", "Cannot handle a null message; maybe the bus was disconnected");
            }

            {
                object field_value;
                if (msg.Header.Fields.TryGetValue(FieldCode.ReplySerial, out field_value))
                {
                    uint        reply_serial = (uint)field_value;
                    PendingCall pending;

                    if (pendingCalls.TryGetValue(reply_serial, out pending))
                    {
                        if (pendingCalls.Remove(reply_serial))
                        {
                            pending.Reply = msg;
                        }

                        return;
                    }

                    //we discard reply messages with no corresponding PendingCall
                    if (Protocol.Verbose)
                    {
                        Console.Error.WriteLine("Unexpected reply message received: MessageType='" + msg.Header.MessageType + "', ReplySerial=" + reply_serial);
                    }

                    return;
                }
            }

            switch (msg.Header.MessageType)
            {
            case MessageType.MethodCall:
                MethodCall method_call = new MethodCall(msg);
                HandleMethodCall(method_call);
                break;

            case MessageType.Signal:
                //HandleSignal (msg);
                lock (Inbound)
                    Inbound.Enqueue(msg);
                break;

            case MessageType.Error:
                //TODO: better exception handling
                Error  error  = new Error(msg);
                string errMsg = String.Empty;
                if (msg.Signature.Value.StartsWith("s"))
                {
                    MessageReader reader = new MessageReader(msg);
                    errMsg = reader.ReadString();
                }
                //throw new Exception ("Remote Error: Signature='" + msg.Signature.Value + "' " + error.ErrorName + ": " + errMsg);
                //if (Protocol.Verbose)
                Console.Error.WriteLine("Remote Error: Signature='" + msg.Signature.Value + "' " + error.ErrorName + ": " + errMsg);
                break;

            case MessageType.Invalid:
            default:
                throw new Exception("Invalid message received: MessageType='" + msg.Header.MessageType + "'");
            }
        }
Exemplo n.º 14
0
        public virtual void HandleMethodCall(MethodCall method_call)
        {
            Type type = obj.GetType();

            //object retObj = type.InvokeMember (msg.Member, BindingFlags.InvokeMethod, null, obj, MessageHelper.GetDynamicValues (msg));

            //TODO: there is no member name mapping for properties etc. yet

            // FIXME: Inefficient to do this on every call
            MethodInfo mi = Mapper.GetMethod(type, method_call);

            if (mi == null)
            {
                conn.MaybeSendUnknownMethodError(method_call);
                return;
            }

            MethodCaller2 mCaller;

            if (!mCallers.TryGetValue(mi, out mCaller))
            {
                //mCaller = TypeImplementer.GenCaller (mi, obj);
                mCaller      = TypeImplementer.GenCaller2(mi);
                mCallers[mi] = mCaller;
            }

            Signature inSig, outSig;

            TypeImplementer.SigsForMethod(mi, out inSig, out outSig);

            Message       msg       = method_call.message;
            MessageReader msgReader = new MessageReader(method_call.message);
            MessageWriter retWriter = new MessageWriter();

            /*
             * MessageWriter retWriter = null;
             * if (msg.ReplyExpected)
             *      retWriter = new MessageWriter ();
             */

            Exception raisedException = null;

            try {
                //mCaller (msgReader, method_call.message, retWriter);
                mCaller(obj, msgReader, method_call.message, retWriter);
            } catch (Exception e) {
                raisedException = e;
            }

            if (!msg.ReplyExpected)
            {
                return;
            }

            Message replyMsg;

            if (raisedException == null)
            {
                MethodReturn method_return = new MethodReturn(msg.Header.Serial);
                replyMsg           = method_return.message;
                replyMsg.Body      = retWriter.ToArray();
                replyMsg.Signature = outSig;
            }
            else
            {
                Error error;
                // BusException allows precisely formatted Error messages.
                BusException busException = raisedException as BusException;
                if (busException != null)
                {
                    error = method_call.CreateError(busException.ErrorName, busException.ErrorMessage);
                }
                else if (raisedException is ArgumentException && raisedException.TargetSite.Name == mi.Name)
                {
                    // Name match trick above is a hack since we don't have the resolved MethodInfo.
                    ArgumentException argException = (ArgumentException)raisedException;
                    using (System.IO.StringReader sr = new System.IO.StringReader(argException.Message)) {
                        error = method_call.CreateError("org.freedesktop.DBus.Error.InvalidArgs", sr.ReadLine());
                    }
                }
                else
                {
                    error = method_call.CreateError(Mapper.GetInterfaceName(raisedException.GetType()), raisedException.Message);
                }

                replyMsg = error.message;
            }

            if (method_call.Sender != null)
            {
                replyMsg.Header[FieldCode.Destination] = method_call.Sender;
            }

            conn.Send(replyMsg);
        }