Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / MarshalByRefObject.cs / 1 / MarshalByRefObject.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** File: MarshalByRefObject.cs ** ** ** ** Purpose: Defines the root type for all marshal by reference aka ** AppDomain bound types ** ** ** ===========================================================*/ namespace System { using System; using System.Security; using System.Security.Permissions; using System.Threading; using System.Runtime.Remoting; using System.Runtime.Remoting.Lifetime; using System.Runtime.Remoting.Services; using System.Runtime.InteropServices; using System.Reflection; using System.Runtime.CompilerServices; using CultureInfo = System.Globalization.CultureInfo; [Serializable()] [System.Runtime.InteropServices.ComVisible(true)] public abstract class MarshalByRefObject { private Object __identity; private Object Identity { get { return __identity; } set { __identity = value; } } #if FEATURE_COMINTEROP internal IntPtr GetComIUnknown(bool fIsBeingMarshalled) { IntPtr pUnk; if(RemotingServices.IsTransparentProxy(this)) { pUnk = RemotingServices.GetRealProxy(this).GetCOMIUnknown(fIsBeingMarshalled); } else { pUnk = Marshal.GetIUnknownForObject(this); } return pUnk; } [MethodImplAttribute(MethodImplOptions.InternalCall)] internal static extern IntPtr GetComIUnknown(MarshalByRefObject o); #endif // FEATURE_COMINTEROP // (1) for remote COM objects IsInstance of can't be executed on // the proxies, so we need this method to be executed on the // actual object. // (2) for remote objects that do not have the complete type information // we intercept calls to check the type and execute it on the actual // object internal bool IsInstanceOfType(Type T) { return T.IsInstanceOfType(this); } // for remote COM Objects the late binding methods can't be // executed on proxies, so we need this method to execute on // the real object internal Object InvokeMember(String name,BindingFlags invokeAttr,Binder binder, Object[] args,ParameterModifier[] modifiers,CultureInfo culture,String[] namedParameters) { Type t = GetType(); // Sanity check if(!t.IsCOMObject) throw new InvalidOperationException(Environment.GetResourceString("Arg_InvokeMember")); // Call into the runtime to invoke on the COM object. return t.InvokeMember(name, invokeAttr, binder, this, args, modifiers, culture, namedParameters); } // Returns a new cloned MBR instance that is a memberwise copy of this // with the identity nulled out, so there are no identity conflicts // when the cloned object is marshalled protected MarshalByRefObject MemberwiseClone(bool cloneIdentity) { MarshalByRefObject mbr = (MarshalByRefObject)base.MemberwiseClone(); // set the identity on the cloned object to null if (!cloneIdentity) mbr.Identity = null; return mbr; } // A helper routine to extract the identity either from the marshalbyrefobject base // class if it is not a proxy, otherwise from the real proxy. // A flag is set to indicate whether the object passed in is a server or a proxy internal static Identity GetIdentity(MarshalByRefObject obj, out bool fServer) { fServer = true; Identity id = null; if(null != obj) { if(!RemotingServices.IsTransparentProxy(obj)) { id = (Identity)obj.Identity; } else { // Toggle flag to indicate that we have a proxy fServer = false; id = RemotingServices.GetRealProxy(obj).IdentityObject; } } return id; } // Another helper that delegates to the helper above internal static Identity GetIdentity(MarshalByRefObject obj) { BCLDebug.Assert(!RemotingServices.IsTransparentProxy(obj), "Use this method for server objects only"); bool fServer; return GetIdentity(obj, out fServer); } internal ServerIdentity __RaceSetServerIdentity(ServerIdentity id) { if (__identity == null) { // For strictly MBR types, the TP field in the identity // holds the real server if (!id.IsContextBound) { id.RaceSetTransparentProxy(this); } Interlocked.CompareExchange(ref __identity, id, null); } return (ServerIdentity)__identity; } internal void __ResetServerIdentity() { __identity = null; } // This method is used return a lifetime service object which // is used to control the lifetime policy to the object. // For the default Lifetime service this will be an object of typoe ILease. // [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] public Object GetLifetimeService() { return LifetimeServices.GetLease(this); } // This method is used return lifetime service object. This method // can be overridden to return a LifetimeService object with properties unique to // this object. // For the default Lifetime service this will be an object of type ILease. // [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] public virtual Object InitializeLifetimeService() { return LifetimeServices.GetLeaseInitial(this); } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] public virtual ObjRef CreateObjRef(Type requestedType) { if(__identity == null) { throw new RemotingException(Environment.GetResourceString( "Remoting_NoIdentityEntry")); } return new ObjRef(this, requestedType); } // This is for casting interop ObjRefLite's. // ObjRefLite's have been deprecated. These methods are not exposed // through any user APIs and would be removed in the future internal bool CanCastToXmlType(String xmlTypeName, String xmlTypeNamespace) { Type castType = SoapServices.GetInteropTypeFromXmlType(xmlTypeName, xmlTypeNamespace); if (castType == null) { String typeNamespace; String assemblyName; if (!SoapServices.DecodeXmlNamespaceForClrTypeNamespace(xmlTypeNamespace, out typeNamespace, out assemblyName)) return false; String typeName; if ((typeNamespace != null) && (typeNamespace.Length > 0)) typeName = typeNamespace + "." + xmlTypeName; else typeName = xmlTypeName; try { Assembly asm = Assembly.Load(assemblyName); castType = asm.GetType(typeName, false, false); } catch { return false; } } if (castType != null) return castType.IsAssignableFrom(this.GetType()); return false; } // CanCastToXmlType // helper method for calling CanCastToXmlType // ObjRefLite's have been deprecated. These methods are not exposed // through any user APIs and would be removed in the future internal static bool CanCastToXmlTypeHelper(Type castType, MarshalByRefObject o) { if (castType == null) throw new ArgumentNullException("castType"); // MarshalByRefObject's can only be casted to MarshalByRefObject's or interfaces. if (!castType.IsInterface && !castType.IsMarshalByRef) return false; // figure out xml type name String xmlTypeName = null; String xmlTypeNamespace = null; if (!SoapServices.GetXmlTypeForInteropType(castType, out xmlTypeName, out xmlTypeNamespace)) { // There's no registered interop type name, so just use the default. xmlTypeName = castType.Name; xmlTypeNamespace = SoapServices.CodeXmlNamespaceForClrTypeNamespace( castType.Namespace, castType.Module.Assembly.nGetSimpleName()); } return o.CanCastToXmlType(xmlTypeName, xmlTypeNamespace); } // CanCastToXmlType } } // namespace
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