//=============================================================================
/**
 *  @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 "tao/IOPC.h"


#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

class TAO_Profile;
class TAO_MProfile;
class TAO_GIOP_Invocation;
class TAO_ServerRequest;
class TAO_Message_State_Factory;

/**
 * @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:

  /// 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 (TAO_MProfile *mprofile,
                                         TAO_Profile *&pfile);

  /// Select the profile from MProfile as the needs of the services
  /// may be. Return the profile in <pfile>
  virtual CORBA::Boolean reselect_profile (TAO_Stub *stub,
                                           TAO_Profile *&pfile);

  /// Reset the profile flags that the services could have
  virtual void reset_profile_flags (void);

  /// Check whether <obj> is nil or not.
  virtual CORBA::Boolean object_is_nil (CORBA::Object_ptr obj);


  /// Allow the services to add service specific service context
  /// information.
  virtual void service_context_list (TAO_Stub *&stub,
                                     IOP::ServiceContextList &service_list,
                                     CORBA::Boolean restart
                                     ACE_ENV_ARG_DECL);

  /// Allow the service layer to decide whether the COMM_FAILURE
  /// exception should be thrown or a reinvocation is needed
  virtual int raise_comm_failure (TAO_GIOP_Invocation *invoke,
                                  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 int raise_transient_failure (TAO_GIOP_Invocation *invoke,
                                       TAO_Profile *profile
                                       ACE_ENV_ARG_DECL);


  /**
   * Send the message state to the FT service for logging. This hook
   * sends the message state after the server receives the
   * message. The message at this point has been verified that it is a
   * GIOP message.
   */
  virtual void service_log_msg_rcv (TAO_Message_State_Factory &state);

  /**
   * Send the message state to the FT service for logging. This hook
   * sends the message state after the POA receives upcall but just
   * before the call has been dispatched to the servant
   */
  virtual void service_log_msg_pre_upcall (TAO_ServerRequest &req);

  /**
   * Send the message state to the FT service for logging. This hook
   * sends the message state just before the reply is ready to be
   * dispatched.
   */
  virtual void service_log_msg_post_upcall (TAO_ServerRequest &req);
};


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

#include "ace/post.h"
#endif /*TAO_SERVICE_CALLBACK_H*/