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diff --git a/trunk/TAO/tao/Service_Callbacks.h b/trunk/TAO/tao/Service_Callbacks.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file    Service_Callbacks.h
+ *
+ *  $Id$
+ *
+ * This is a generic interface that would be used to override many
+ * of the default functionalities that the ORB provides by the
+ * services if they have been loaded in to the ORB_Core
+ *
+ *  @author Bala Natarajan <bala@cs.wustl.edu>
+ */
+//=============================================================================
+
+#ifndef TAO_SERVICE_CALLBACK_H
+#define TAO_SERVICE_CALLBACK_H
+
+#include /**/ "ace/pre.h"
+#include "ace/CORBA_macros.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include /**/ "tao/TAO_Export.h"
+#include "tao/Basic_Types.h"
+#include "tao/Invocation_Utils.h"
+#include "tao/Object.h"
+#include "tao/Service_Context.h"
+
+TAO_BEGIN_VERSIONED_NAMESPACE_DECL
+
+class TAO_Profile;
+class TAO_MProfile;
+class TAO_Stub;
+
+namespace CORBA
+{
+  class Object;
+  typedef Object *Object_ptr;
+
+  class Environment;
+}
+
+namespace IOP
+{
+  class ServiceContextList;
+}
+
+/**
+ * @class TAO_Service_Callbacks
+ *
+ * @brief An Abstract Base class for the hooks in the ORB.
+ *
+ * This class (would) define all the hooks that may be needed by
+ * the ORB to override some of its default behaviour. The methods
+ * can be potentially used to call service level specific
+ * processing that may be required.
+ */
+class TAO_Export TAO_Service_Callbacks
+{
+
+public:
+
+  enum Profile_Equivalence
+  {
+    EQUIVALENT,
+    NOT_EQUIVALENT,
+    DONT_KNOW
+  };
+
+
+  /// Dtor
+  virtual ~TAO_Service_Callbacks (void);
+
+  /// Select the profile from MProfile as the needs of the services
+  /// may be. Return the profile in <pfile>
+  virtual CORBA::Boolean select_profile (const TAO_MProfile &mprofile,
+                                         TAO_Profile *&pfile);
+
+  /// Check whether <obj> is nil or not.
+  virtual CORBA::Boolean object_is_nil (CORBA::Object_ptr obj);
+
+
+  /// Check for equivalency of the two profiles
+  virtual Profile_Equivalence is_profile_equivalent (const TAO_Profile *,
+                                                     const TAO_Profile *);
+
+  /// Calculate the hash value..
+  virtual CORBA::ULong hash_ft (TAO_Profile *p,
+                                CORBA::ULong m);
+
+  // Verify if condition is given for LOCATION_FORWARD_PERM reply
+  virtual CORBA::Boolean is_permanent_forward_condition (const CORBA::Object_ptr obj,
+                                                         const TAO_Service_Context &service_context) const;
+
+
+
+  /// Allow the service layer to decide whether the COMM_FAILURE
+  /// exception should be thrown or a reinvocation is needed
+  virtual TAO::Invocation_Status raise_comm_failure (
+      IOP::ServiceContextList &clist,
+      TAO_Profile *profile
+      ACE_ENV_ARG_DECL);
+
+  /// Allow the service layer to decide whether the TRANSIENT
+  /// exception should be thrown or a reinvocation is needed
+  virtual TAO::Invocation_Status raise_transient_failure (
+      IOP::ServiceContextList &clist,
+      TAO_Profile *profile
+      ACE_ENV_ARG_DECL);
+};
+
+TAO_END_VERSIONED_NAMESPACE_DECL
+
+#include /**/ "ace/post.h"
+
+#endif /*TAO_SERVICE_CALLBACK_H*/