Request.cpp

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// $Id: Request.cpp 80380 2008-01-07 13:11:49Z mcorino $

#include "tao/DynamicInterface/Request.h"

ACE_RCSID (DynamicInterface,
           Request,
           "$Id: Request.cpp 80380 2008-01-07 13:11:49Z mcorino $")

#include "tao/DynamicInterface/DII_Invocation_Adapter.h"
#include "tao/DynamicInterface/DII_Arguments.h"
#include "tao/DynamicInterface/Context.h"

#if defined (TAO_HAS_AMI)
#include "tao/Messaging/Asynch_Invocation_Adapter.h"
#include "tao/DynamicInterface/DII_Reply_Handler.h"
#endif /* TAO_HAS_AMI */

#include "tao/AnyTypeCode/NVList.h"
#include "tao/Object.h"
#include "tao/Pluggable_Messaging_Utils.h"
#include "tao/AnyTypeCode/Any_Unknown_IDL_Type.h"

#include "ace/Log_Msg.h"
#include "ace/OS_NS_string.h"

#if !defined (__ACE_INLINE__)
# include "tao/DynamicInterface/Request.inl"
#endif /* ! __ACE_INLINE__ */


TAO_BEGIN_VERSIONED_NAMESPACE_DECL

// Reference counting for DII Request object.

CORBA::ULong
CORBA::Request::_incr_refcnt (void)
{
  return ++this->refcount_;
}

CORBA::ULong
CORBA::Request::_decr_refcnt (void)
{
  CORBA::ULong const new_count = --this->refcount_;

  if (new_count == 0)
    delete this;

  return new_count;
}

// DII Request class implementation

CORBA::Request::Request (CORBA::Object_ptr obj,
                         CORBA::ORB_ptr orb,
                         const CORBA::Char *op,
                         CORBA::NVList_ptr args,
                         CORBA::NamedValue_ptr result,
                         CORBA::Flags flags,
                         CORBA::ExceptionList_ptr exceptions)
  : target_ (CORBA::Object::_duplicate (obj)),
    orb_ (CORBA::ORB::_duplicate (orb)),
    opname_ (CORBA::string_dup (op)),
    args_ (CORBA::NVList::_duplicate (args)),
    result_ (CORBA::NamedValue::_duplicate (result)),
    flags_ (flags),
    // env_ (env),
    exceptions_ (CORBA::ExceptionList::_duplicate (exceptions)),
    contexts_ (0),
    ctx_ (CORBA::Context::_nil ()),
    refcount_ (1),
    lazy_evaluation_ (false),
    response_received_ (false),
    byte_order_ (TAO_ENCAP_BYTE_ORDER)
{
  if (this->exceptions_.in () == 0)
    {
      CORBA::ExceptionList *tmp = 0;
      ACE_NEW (tmp,
               CORBA::ExceptionList);

      this->exceptions_ = tmp;
    }
}

CORBA::Request::Request (CORBA::Object_ptr obj,
                         CORBA::ORB_ptr orb,
                         const CORBA::Char *op)
  : target_ (CORBA::Object::_duplicate (obj)),
    orb_ (CORBA::ORB::_duplicate (orb)),
    opname_ (CORBA::string_dup (op)),
    flags_ (0),
    // env_ (env),
    contexts_ (0),
    ctx_ (CORBA::Context::_nil ()),
    refcount_ (1),
    lazy_evaluation_ (false),
    response_received_ (false),
    byte_order_ (TAO_ENCAP_BYTE_ORDER)
{
  CORBA::ExceptionList *tmp = 0;
  ACE_NEW (tmp,
           CORBA::ExceptionList);

  this->exceptions_ = tmp;

  ACE_NEW (this->args_,
           CORBA::NVList);

  ACE_NEW (this->result_,
           CORBA::NamedValue);
}

CORBA::Request::~Request (void)
{
  ACE_ASSERT (refcount_ == 0);

  ::CORBA::release (this->target_);
  ::CORBA::string_free ((char*) this->opname_);
  this->opname_ = 0;
  ::CORBA::release (this->args_);
  ::CORBA::release (this->result_);
}

// The public DII interfaces:  normal and oneway calls.
//
// NOTE that using DII, programmers can get the special behaviour of
// discarding the response for normal calls.  This doesn't change the
// semantics of any OMG-IDL interface, it just streamlines control
// flow in some exotic situations.

void
CORBA::Request::invoke (void)
{
  TAO::NamedValue_Argument _tao_retval (this->result_);

  TAO::NVList_Argument _tao_in_list (this->args_,
                                     this->lazy_evaluation_);

  TAO::Argument *_tao_arg_list [] = {
    &_tao_retval,
    &_tao_in_list
  };

  TAO::DII_Invocation_Adapter _tao_call (
       this->target_,
       _tao_arg_list,
       sizeof( _tao_arg_list ) / sizeof( TAO::Argument* ),
       this->opname_,
       static_cast<CORBA::ULong> (ACE_OS::strlen (this->opname_)),
       this->exceptions_.in (),
       this);

  _tao_call.invoke (0, 0);

  // If we returned without an exception being thrown the response
  // (if any) is assumed to be received.
  this->response_received_ = true;
  
  // If this request was created by a gateway, then result_
  // and/or args_ are shared by a CORBA::ServerRequest, whose
  // reply must be in the same byte order as the reply we are
  // handling here. So we set the member to be accessed later.
  this->byte_order_ = _tao_retval.byte_order ();
}

void
CORBA::Request::send_oneway (void)
{
  TAO::NamedValue_Argument _tao_retval (this->result_);

  TAO::NVList_Argument _tao_in_list (this->args_,
                                     this->lazy_evaluation_);

  TAO::Argument *_tao_arg_list [] = {
    &_tao_retval,
    &_tao_in_list
  };

  TAO::DII_Oneway_Invocation_Adapter _tao_call (
      this->target_,
      _tao_arg_list,
      sizeof( _tao_arg_list ) / sizeof( TAO::Argument* ),
      this->opname_,
      static_cast<CORBA::ULong> (ACE_OS::strlen (this->opname_)),
      TAO::TAO_SYNCHRONOUS_INVOCATION);

  _tao_call.invoke (0, 0);
}

void
CORBA::Request::send_deferred (void)
{
  {
    ACE_GUARD (TAO_SYNCH_MUTEX,
               ace_mon,
               this->lock_);

    this->response_received_ = false;
  }
  CORBA::Boolean const argument_flag = this->args_->count () ? true : false;

  TAO::NamedValue_Argument _tao_retval (this->result_);

  TAO::NVList_Argument _tao_in_list (this->args_,
                                     this->lazy_evaluation_);

  TAO::Argument *_tao_arg_list [] = {
    &_tao_retval,
    &_tao_in_list
  };

  size_t number_args = 0;

  if (argument_flag)
    number_args = 2;
  else
    number_args = 1;

  TAO::DII_Deferred_Invocation_Adapter _tao_call (
      this->target_,
      _tao_arg_list,
      number_args,
      this->opname_,
      static_cast<CORBA::ULong> (ACE_OS::strlen (this->opname_)),
      0,
      this->orb_->orb_core (),
      this);

  _tao_call.invoke (0, 0);
}

#if defined (TAO_HAS_AMI)
void
CORBA::Request::sendc (CORBA::Object_ptr handler)
{
  TAO::NamedValue_Argument _tao_retval (this->result_);

  TAO::NVList_Argument _tao_in_list (this->args_,
                                     this->lazy_evaluation_);

  TAO::Argument *_tao_arg_list [] = {
    &_tao_retval,
    &_tao_in_list
  };

  TAO::Asynch_Invocation_Adapter _tao_call (
       this->target_,
       _tao_arg_list,
       sizeof( _tao_arg_list ) / sizeof( TAO::Argument* ),
       const_cast<char *> (this->opname_),
       static_cast<CORBA::ULong> (ACE_OS::strlen (this->opname_)),
       0); // collocation proxy broker

  _tao_call.invoke (dynamic_cast<Messaging::ReplyHandler_ptr>(handler),
                    &CORBA::Request::_tao_reply_stub);
}

void
CORBA::Request::_tao_reply_stub (TAO_InputCDR &_tao_in,
                                 Messaging::ReplyHandler_ptr rh,
                                 CORBA::ULong reply_status)
{
  // Retrieve Reply Handler object.
  TAO_DII_Reply_Handler* reply_handler =
    dynamic_cast<TAO_DII_Reply_Handler*> (rh);

  // Exception handling
  switch (reply_status)
    {
    case TAO_AMI_REPLY_OK:
    case TAO_AMI_REPLY_NOT_OK:
      {
        reply_handler->handle_response(_tao_in);
        break;
      }
    case TAO_AMI_REPLY_USER_EXCEPTION:
    case TAO_AMI_REPLY_SYSTEM_EXCEPTION:
      {
        reply_handler->handle_excep (_tao_in, reply_status);
        break;
      }
    case TAO_AMI_REPLY_LOCATION_FORWARD:
    case TAO_AMI_REPLY_LOCATION_FORWARD_PERM:
      {
        reply_handler->handle_location_forward (_tao_in, reply_status);
        break;
      }
    }
}
#endif /* TAO_HAS_AMI */

void
CORBA::Request::get_response (void)
{
  while (!this->response_received_)
    {
      (void) this->orb_->perform_work ();
    }

  if (this->lazy_evaluation_)
    {
      this->args_->evaluate ();
    }
}

CORBA::Boolean
CORBA::Request::poll_response (void)
{
  CORBA::Boolean response_received = false;

  {
    ACE_GUARD_RETURN (TAO_SYNCH_MUTEX,
                      ace_mon,
                      this->lock_,
                      false);
    response_received = this->response_received_;
  }

  if (!response_received)
    {
      // If we're single-threaded, the application could starve the ORB,
      // and the response never gets received, so let the ORB do an
      // atom of work, if necessary, each time we poll.
      ACE_Time_Value tv (0, 0);
      (void) this->orb_->perform_work (&tv);

      {
        ACE_GUARD_RETURN (TAO_SYNCH_MUTEX,
                          ace_mon,
                          this->lock_,
                          false);
        response_received = this->response_received_;
      }
    }

  return response_received;
}

void
CORBA::Request::handle_response (TAO_InputCDR &incoming,
                                 GIOP::ReplyStatusType reply_status)
{
  // If this request was created by a gateway, then result_
  // and/or args_ are shared by a CORBA::ServerRequest, whose
  // reply must be in the same byte order as the reply we are
  // handling here. So we set the member to be accessed later.
  this->byte_order_ = incoming.byte_order ();

  switch (reply_status)
  {
    case GIOP::NO_EXCEPTION:
      if (this->result_ != 0)
        {
          // We can be sure that the impl is a TAO::Unknown_IDL_Type.
          this->result_->value ()->impl ()->_tao_decode (incoming);
        }

      this->args_->_tao_incoming_cdr (incoming,
                                      CORBA::ARG_OUT | CORBA::ARG_INOUT,
                                      this->lazy_evaluation_);

      {
        ACE_GUARD (TAO_SYNCH_MUTEX,
                   ace_mon,
                   this->lock_);

        this->response_received_ = true;
      }

      break;
    case GIOP::USER_EXCEPTION:
    case GIOP::SYSTEM_EXCEPTION:
    case GIOP::LOCATION_FORWARD:
    case GIOP::LOCATION_FORWARD_PERM:
    default:
      // @@ (JP) Don't know what to do about any of these yet.
      ACE_ERROR ((LM_ERROR,
                  ACE_TEXT ("(%P|%t) unhandled reply status\n")));
  }
}

TAO_END_VERSIONED_NAMESPACE_DECL

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