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path: root/TAO/tao/Object.cpp
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// @(#) $Id$
//
// Copyright 1994-1995 by Sun Microsystems Inc.
// Copyright 1997-2002 by Washington University
// All Rights Reserved
//
// ORB:         CORBA::Object operations

#include "tao/Object.h"
#include "tao/Stub.h"
#include "tao/Profile.h"
#include "tao/ORB_Core.h"
#include "tao/Invocation.h"
#include "tao/Connector_Registry.h"
#include "tao/debug.h"
#include "tao/Remote_Object_Proxy_Broker.h"
#include "tao/Dynamic_Adapter.h"
#include "tao/IFR_Client_Adapter.h"

#include "ace/Dynamic_Service.h"

#if !defined (__ACE_INLINE__)
# include "tao/Object.i"
#endif /* ! __ACE_INLINE__ */

ACE_RCSID (tao,
           Object,
           "$Id$")

int CORBA::Object::_tao_class_id = 0;

CORBA::Object::~Object (void)
{
  if (this->protocol_proxy_)
    (void) this->protocol_proxy_->_decr_refcnt ();

  delete this->refcount_lock_;
}

CORBA::Object::Object (TAO_Stub * protocol_proxy,
                       CORBA::Boolean collocated,
                       TAO_Abstract_ServantBase * servant)
  : is_collocated_ (collocated),
    servant_ (servant),
    is_local_ (protocol_proxy == 0 ? 1 : 0),
    proxy_broker_ (0),
    protocol_proxy_ (protocol_proxy),
    refcount_ (1),
    refcount_lock_ (0)
{
  if (protocol_proxy != 0)
    {
      // Only instantiate a lock if the object is unconstrained.
      // Locality-constrained objects have no-op reference counting by
      // default.  Furthermore locality-constrained objects may be
      // instantiated in the critical path.  Instantiating a lock for
      // unconstrained objects alone optimizes instantiation of such
      // locality-constrained objects.
      ACE_NEW (this->refcount_lock_, TAO_SYNCH_MUTEX);

      // If the object is collocated then set the broker using the
      // factory otherwise use the remote proxy broker.
      if (this->is_collocated_ &&
          _TAO_collocation_Object_Proxy_Broker_Factory_function_pointer != 0)
        this->proxy_broker_ = _TAO_collocation_Object_Proxy_Broker_Factory_function_pointer (this);
      else
        this->proxy_broker_ = the_tao_remote_object_proxy_broker ();
    }
}

void
CORBA::Object::_add_ref (void)
{
  if (this->refcount_lock_ != 0)
    {
      ACE_GUARD (TAO_SYNCH_MUTEX, mon, *this->refcount_lock_);

      this->refcount_++;
    }
}

void
CORBA::Object::_remove_ref (void)
{
  if (this->refcount_lock_ != 0)
    {
      {
        ACE_GUARD (TAO_SYNCH_MUTEX, mon, *this->refcount_lock_);

        this->refcount_--;

        if (this->refcount_ != 0)
          return;
      }

      delete this;
    }
}

void
CORBA::Object::_tao_any_destructor (void *x)
{
  CORBA::Object_ptr tmp = ACE_static_cast (CORBA::Object_ptr, x);
  CORBA::release (tmp);
}

TAO_Abstract_ServantBase*
CORBA::Object::_servant (void) const
{
  return this->servant_;
}

// IS_A ... ask the object if it's an instance of the type whose
// logical type ID is passed as a parameter.

CORBA::Boolean
CORBA::Object::_is_a (const char *type_id
                      ACE_ENV_ARG_DECL)
{
  // NOTE: if istub->type_id is nonzero and we have local knowledge of
  // it, we can answer this question without a costly remote call.
  //
  // That "local knowledge" could come from stubs or skeletons linked
  // into this process in the best case, or a "near" repository in a
  // slightly worse case.  Or in a trivial case, if the ID being asked
  // about is the ID we have recorded, we don't need to ask about the
  // inheritance relationships at all!
  //
  // In real systems having local knowledge will be common, though as
  // the systems built atop ORBs become richer it'll also become
  // common to have the "real type ID" not be directly understood
  // because it's more deeply derived than any locally known types.
  //
  // XXX if type_id is that of CORBA::Object, "yes, we comply" :-)

  if (this->protocol_proxy_ == 0)
    ACE_THROW_RETURN (CORBA::NO_IMPLEMENT (), 0);

  if (this->_stubobj ()->type_id.in () != 0
      && ACE_OS::strcmp (type_id,
                         this->_stubobj ()->type_id.in ()) == 0)
    return 1;

  CORBA::Boolean _tao_retval = 0;

  // Get the right Proxy Implementation.
  TAO_Object_Proxy_Impl &the_proxy =
    this->proxy_broker_->select_proxy (this ACE_ENV_ARG_PARAMETER);
  ACE_CHECK_RETURN (0);

  // Preform the Call.
  _tao_retval = the_proxy._is_a (this, type_id ACE_ENV_ARG_PARAMETER);
  ACE_CHECK_RETURN (0);

  return _tao_retval;
}

const char*
CORBA::Object::_interface_repository_id (void) const
{
  return "IDL:omg.org/CORBA/Object:1.0";
}

CORBA::Boolean
CORBA::Object::_is_collocated (void) const
{
  return this->is_collocated_;
}

CORBA::Boolean
CORBA::Object::_is_local (void) const
{
  return this->is_local_;
}

CORBA::ULong
CORBA::Object::_hash (CORBA::ULong maximum
                      ACE_ENV_ARG_DECL)
{
  if (this->protocol_proxy_ != 0)
    return this->protocol_proxy_->hash (maximum ACE_ENV_ARG_PARAMETER);
  else
    {
      // Locality-constrained object.

      // Note that we reinterpret_cast to an "unsigned long" instead
      // of CORBA::ULong since we need to first cast to an integer
      // large enough to hold an address to avoid compile-time
      // warnings on some 64-bit platforms.
      CORBA::ULong hash = ACE_reinterpret_cast (unsigned long, this);

      return hash % maximum;
    }
}

CORBA::Boolean
CORBA::Object::_is_equivalent (CORBA::Object_ptr other_obj
                               ACE_ENV_ARG_DECL_NOT_USED)
  ACE_THROW_SPEC (())
{
  if (other_obj == this)
    {
      return 1;
    }

  if (this->protocol_proxy_ != 0)
    return this->protocol_proxy_->is_equivalent (other_obj);

  return 0;
}

// TAO's extensions

TAO_ObjectKey *
CORBA::Object::_key (ACE_ENV_SINGLE_ARG_DECL)
{
  if (this->_stubobj () && this->_stubobj ()->profile_in_use ())
    return this->_stubobj ()->profile_in_use ()->_key ();

  if (TAO_debug_level > 2)
    ACE_ERROR ((LM_ERROR,
                ACE_TEXT ("TAO (%P|%t) Null object key return from ")
                ACE_TEXT ("profile in use\n")));

  ACE_THROW_RETURN (CORBA::INTERNAL (
                      CORBA::SystemException::_tao_minor_code (
                        TAO_DEFAULT_MINOR_CODE,
                        EINVAL),
                      CORBA::COMPLETED_NO),
                    0);
}

const TAO_ObjectKey &
CORBA::Object::_object_key (void)
{
  return this->_stubobj ()->profile_in_use ()->object_key ();
}

void *
CORBA::Object::_tao_QueryInterface (ptr_arith_t type)
{
  void *retv = 0;

  if (type == ACE_reinterpret_cast (ptr_arith_t,
                                    &CORBA::Object::_tao_class_id))
    retv = ACE_reinterpret_cast (void *, this);

  if (retv)
    this->_add_ref ();

  return retv;
}

void
CORBA::Object::_proxy_broker (TAO_Object_Proxy_Broker *proxy_broker)
{
  this->proxy_broker_ = proxy_broker;
}

TAO_Object_Proxy_Broker *
CORBA::Object::_proxy_broker (void)
{
  return this->proxy_broker_;
}

CORBA::Boolean
CORBA::Object::is_nil_i (CORBA::Object_ptr obj)
{
  // To accomodate new definitions.
  if (obj->_stubobj ())
    {
      return obj->_stubobj ()->orb_core ()->object_is_nil (obj);
    }

  return 0;
}

#if (TAO_HAS_MINIMUM_CORBA == 0)

void
CORBA::Object::_create_request (CORBA::Context_ptr ctx,
                                const char *operation,
                                CORBA::NVList_ptr arg_list,
                                CORBA::NamedValue_ptr result,
                                CORBA::Request_ptr &request,
                                CORBA::Flags req_flags
                                ACE_ENV_ARG_DECL)
{
  // Since we don't really support Context, anything but a null pointer
  // is a no-no.
  // Neither can we create a request object from locality constrained
  // object references.
  if (ctx != 0 || this->protocol_proxy_ == 0)
    {
      ACE_THROW (CORBA::NO_IMPLEMENT ());
    }

  TAO_Dynamic_Adapter *dynamic_adapter =
    ACE_Dynamic_Service<TAO_Dynamic_Adapter>::instance (
        TAO_ORB_Core::dynamic_adapter_name ()
      );

  dynamic_adapter->create_request (
                       this,
                       this->protocol_proxy_->orb_core ()-> orb (),
                       operation,
                       arg_list,
                       result,
                       0,
                       request,
                       req_flags
                       ACE_ENV_ARG_PARAMETER
                     );
}

void
CORBA::Object::_create_request (CORBA::Context_ptr ctx,
                                const char *operation,
                                CORBA::NVList_ptr arg_list,
                                CORBA::NamedValue_ptr result,
                                CORBA::ExceptionList_ptr exceptions,
                                CORBA::ContextList_ptr,
                                CORBA::Request_ptr &request,
                                CORBA::Flags req_flags
                                ACE_ENV_ARG_DECL)
{
  // Since we don't really support Context, anything but a null pointer
  // is a no-no.
  // Neither can we create a request object from locality constrained
  // object references.
  if (ctx != 0 || this->protocol_proxy_ == 0)
    {
      ACE_THROW (CORBA::NO_IMPLEMENT ());
    }

  TAO_Dynamic_Adapter *dynamic_adapter =
    ACE_Dynamic_Service<TAO_Dynamic_Adapter>::instance (
        TAO_ORB_Core::dynamic_adapter_name ()
      );

  dynamic_adapter->create_request (
                       this,
                       this->protocol_proxy_->orb_core ()-> orb (),
                       operation,
                       arg_list,
                       result,
                       exceptions,
                       request,
                       req_flags
                       ACE_ENV_ARG_PARAMETER
                     );
}

CORBA::Request_ptr
CORBA::Object::_request (const char *operation
                         ACE_ENV_ARG_DECL)
{
  if (this->protocol_proxy_)
    {
      TAO_Dynamic_Adapter *dynamic_adapter =
        ACE_Dynamic_Service<TAO_Dynamic_Adapter>::instance (
            TAO_ORB_Core::dynamic_adapter_name ()
          );

      return dynamic_adapter->request (
                                  this,
                                  this->protocol_proxy_->orb_core ()->orb (),
                                  operation
                                  ACE_ENV_ARG_PARAMETER
                                );
    }
  else
    {
      ACE_THROW_RETURN (CORBA::NO_IMPLEMENT (),
                        0);
    }
}

// NON_EXISTENT ... send a simple call to the object, which will
// either elicit a FALSE response or a OBJECT_NOT_EXIST exception.  In
// the latter case, return FALSE.

CORBA::Boolean
CORBA::Object::_non_existent (ACE_ENV_SINGLE_ARG_DECL)
{
  CORBA::Boolean _tao_retval = 0;

  // Get the right Proxy.
  TAO_Object_Proxy_Impl &the_proxy =
    this->proxy_broker_->select_proxy (this
                                       ACE_ENV_ARG_PARAMETER);
  ACE_CHECK_RETURN (0);

  // Perform the Call.
  _tao_retval = the_proxy._non_existent (this
                                         ACE_ENV_ARG_PARAMETER);
  ACE_CHECK_RETURN (0);

  return _tao_retval;
}


CORBA::InterfaceDef_ptr
CORBA::Object::_get_interface (ACE_ENV_SINGLE_ARG_DECL)
{
  // Get the right Proxy.
  TAO_Object_Proxy_Impl &the_proxy =
    this->proxy_broker_->select_proxy (this
                                       ACE_ENV_ARG_PARAMETER);
  ACE_CHECK_RETURN (0);

  // Perform the Call.
  return the_proxy._get_interface (this
                                   ACE_ENV_ARG_PARAMETER);
}

CORBA::ImplementationDef_ptr
CORBA::Object::_get_implementation (ACE_ENV_SINGLE_ARG_DECL_NOT_USED)
{
  return 0;
}

CORBA::Object_ptr
CORBA::Object::_get_component (ACE_ENV_SINGLE_ARG_DECL)
{
  // Get the right Proxy.
  TAO_Object_Proxy_Impl &the_proxy =
    this->proxy_broker_->select_proxy (this
                                       ACE_ENV_ARG_PARAMETER);
  ACE_CHECK_RETURN (0);

  // Perform the Call.
  return the_proxy._get_component (this
                                   ACE_ENV_ARG_PARAMETER);
}


#endif /* TAO_HAS_MINIMUM_CORBA */

// ****************************************************************

// @@ Does it make sense to support policy stuff for locality constrained
//    objects?  Also, does it make sense to bind policies with stub object?
//    - nw.

#if (TAO_HAS_CORBA_MESSAGING == 1)

CORBA::Policy_ptr
CORBA::Object::_get_policy (
  CORBA::PolicyType type
  ACE_ENV_ARG_DECL)
{
  if (this->protocol_proxy_)
    return this->protocol_proxy_->get_policy (type
                                              ACE_ENV_ARG_PARAMETER);
  else
    ACE_THROW_RETURN (CORBA::NO_IMPLEMENT (), CORBA::Policy::_nil ());
}

CORBA::Policy_ptr
CORBA::Object::_get_client_policy (
  CORBA::PolicyType type
  ACE_ENV_ARG_DECL)
{
  if (this->protocol_proxy_)
    return this->_stubobj ()->get_client_policy (type
                                                 ACE_ENV_ARG_PARAMETER);
  else
    ACE_THROW_RETURN (CORBA::NO_IMPLEMENT (), CORBA::Policy::_nil ());
}

CORBA::Object_ptr
CORBA::Object::_set_policy_overrides (
  const CORBA::PolicyList & policies,
  CORBA::SetOverrideType set_add
  ACE_ENV_ARG_DECL)
{
  if (!this->protocol_proxy_)
    ACE_THROW_RETURN (CORBA::NO_IMPLEMENT (), CORBA::Policy::_nil ());

  TAO_Stub* stub =
    this->protocol_proxy_->set_policy_overrides (policies,
                                                 set_add
                                                 ACE_ENV_ARG_PARAMETER);
  ACE_CHECK_RETURN (CORBA::Object::_nil ());

  TAO_Stub_Auto_Ptr safe_stub (stub);

  CORBA::Object_ptr obj = CORBA::Object::_nil ();

  ACE_NEW_THROW_EX (obj,
                    CORBA::Object (stub,
                                  this->is_collocated_),
                    CORBA::NO_MEMORY (
                      CORBA::SystemException::_tao_minor_code (
                        TAO_DEFAULT_MINOR_CODE,
                        ENOMEM),
                      CORBA::COMPLETED_MAYBE));
  ACE_CHECK_RETURN (CORBA::Object::_nil ());

  (void) safe_stub.release ();

  return obj;
}

CORBA::PolicyList *
CORBA::Object::_get_policy_overrides (const CORBA::PolicyTypeSeq & types
                                      ACE_ENV_ARG_DECL)
{
  if (this->protocol_proxy_)
    return this->protocol_proxy_->get_policy_overrides (types
                                                        ACE_ENV_ARG_PARAMETER);
  else
    ACE_THROW_RETURN (CORBA::NO_IMPLEMENT (), 0);
}

CORBA::Boolean
CORBA::Object::_validate_connection (
  CORBA::PolicyList_out inconsistent_policies
  ACE_ENV_ARG_DECL)
{
  inconsistent_policies = 0;

#if (TAO_HAS_MINIMUM_CORBA == 1)

  ACE_ENV_ARG_NOT_USED; // FUZZ: ignore check_for_ace_check

#else

  // If the object is collocated then use non_existent to see whether
  // it's there.
  if (this->is_collocated_)
      return !(this->_non_existent (ACE_ENV_SINGLE_ARG_PARAMETER));

  if (this->protocol_proxy_)
    return this->protocol_proxy_->validate_connection (inconsistent_policies
                                                       ACE_ENV_ARG_PARAMETER);

#endif /* TAO_HAS_MINIMUM_CORBA */

  return 0;
}

#endif /* TAO_HAS_CORBA_MESSAGING == 1 */

// ****************************************************************

CORBA::Boolean
operator<< (TAO_OutputCDR& cdr, const CORBA::Object* x)
{
  if (x == 0)
    {
      // NIL objrefs ... marshal as empty type hint, no elements.
      cdr.write_ulong (1);
      cdr.write_char ('\0');
      cdr.write_ulong (0);
      return (CORBA::Boolean) cdr.good_bit ();
    }

  TAO_Stub *stubobj = x->_stubobj ();

  if (stubobj == 0)
    return 0;

  // STRING, a type ID hint
  if ((cdr << stubobj->type_id.in ()) == 0)
    return 0;

  const TAO_MProfile& mprofile = stubobj->base_profiles ();

  CORBA::ULong profile_count = mprofile.profile_count ();
  if ((cdr << profile_count) == 0)
    return 0;

  // @@ The MProfile should be locked during this iteration, is there
  // anyway to achieve that?
  for (CORBA::ULong i = 0; i < profile_count; ++i)
    {
      const TAO_Profile* p = mprofile.get_profile (i);
      if (p->encode (cdr) == 0)
        return 0;
    }
  return (CORBA::Boolean) cdr.good_bit ();
}

CORBA::Boolean
operator>> (TAO_InputCDR& cdr, CORBA::Object*& x)
{
  CORBA::String_var type_hint;

  if ((cdr >> type_hint.inout ()) == 0)
    return 0;

  CORBA::ULong profile_count;
  if ((cdr >> profile_count) == 0)
    return 0;

  if (profile_count == 0)
    {
      x = CORBA::Object::_nil ();
      return (CORBA::Boolean) cdr.good_bit ();
    }

  // get a profile container to store all profiles in the IOR.
  TAO_MProfile mp (profile_count);

  TAO_ORB_Core *orb_core = cdr.orb_core ();
  if (orb_core == 0)
    {
      orb_core = TAO_ORB_Core_instance ();
      if (TAO_debug_level > 0)
        {
          ACE_DEBUG ((LM_WARNING,
                      ACE_LIB_TEXT ("TAO (%P|%t) WARNING: extracting object from ")
                      ACE_LIB_TEXT ("default ORB_Core\n")));
        }
    }

  // Ownership of type_hint is given to TAO_Stub
  // TAO_Stub will make a copy of mp!

  TAO_Stub *objdata = 0;

  ACE_DECLARE_NEW_CORBA_ENV;
  ACE_TRY
    {
      TAO_Connector_Registry *connector_registry =
        orb_core->connector_registry (ACE_ENV_SINGLE_ARG_PARAMETER);
      ACE_TRY_CHECK;

      for (CORBA::ULong i = 0; i != profile_count && cdr.good_bit (); ++i)
        {
          TAO_Profile *pfile =
            connector_registry->create_profile (cdr);
          if (pfile != 0)
            mp.give_profile (pfile);
        }

      // Make sure we got some profiles!
      if (mp.profile_count () != profile_count)
        {
          // @@ This occurs when profile creation fails when decoding the
          //    profile from the IOR.
          ACE_ERROR_RETURN ((LM_ERROR,
                             ACE_LIB_TEXT ("TAO (%P|%t) ERROR: Could not create all ")
                             ACE_LIB_TEXT ("profiles while extracting object\n")
                             ACE_LIB_TEXT ("TAO (%P|%t) ERROR: reference from the ")
                             ACE_LIB_TEXT ("CDR stream.\n")),
                            0);
        }


      objdata = orb_core->create_stub (type_hint.in (),
                                       mp
                                       ACE_ENV_ARG_PARAMETER);
      ACE_TRY_CHECK;
    }
  ACE_CATCHANY
    {
      if (TAO_debug_level > 0)
        ACE_PRINT_EXCEPTION (ACE_ANY_EXCEPTION,
                             ACE_LIB_TEXT ("TAO (%P|%t) ERROR creating stub ")
                             ACE_LIB_TEXT ("object when demarshaling object ")
                             ACE_LIB_TEXT ("reference.\n"));

      return 0;
    }
  ACE_ENDTRY;
  ACE_CHECK_RETURN (0);

  TAO_Stub_Auto_Ptr safe_objdata (objdata);

  x = orb_core->create_object (safe_objdata.get ());
  if (x == 0)
    return 0;

  // Transfer ownership to the CORBA::Object
  (void) safe_objdata.release ();

  return (CORBA::Boolean) cdr.good_bit ();
}

TAO_Object_Proxy_Broker * (*_TAO_collocation_Object_Proxy_Broker_Factory_function_pointer) (
    CORBA::Object_ptr obj
    ) = 0;

// ****************************************************************

#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)

template class TAO_Object_Manager<CORBA::Object, CORBA::Object_var>;

#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)

#pragma instantiate TAO_Object_Manager<CORBA::Object, CORBA::Object_var>

#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */