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// -*- C++ -*-
// ===================================================================
/**
* @file PICurrent_Guard.h
*
* $Id$
*
* @author Ossama Othman <ossama@dre.vanderbilt.edu>
*/
// ===================================================================
#ifndef TAO_PI_CURRENT_GUARD_H
#define TAO_PI_CURRENT_GUARD_H
#include /**/ "ace/pre.h"
#include "pi_server_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "tao/orbconf.h"
#if TAO_HAS_INTERCEPTORS == 1
/// Forward declarations.
class TAO_ServerRequest;
namespace TAO
{
class PICurrent_Impl;
class PICurrent_Copy_Callback;
/**
* @class PICurrent_Guard
*
* @brief Class used to make copying between request scope current
* and thread scope current exception-safe.
*
* Since copies between the request scope current and thread scope
* current must also occur if an exception is thrown, e.g. made
* available to the send_exception() interception points, the
* "guard" idiom is used to make this action exception-safe.
*
* @note This Guard class is only used on the server side.
*/
class TAO_PI_Server_Export PICurrent_Guard
{
public:
/// Constructor
/**
* This constructor sets up this guard to copy the data held in a
* given PICurrent when transitioning from that PICurrent's scope
* to another scope (e.g. request scope to thread scope transition
* immediately following receive_request_service_contexts() on
* server side).
*
* @param tsc_to_rsc true when copying TSC slot table to RSC slot
* table, i.e. after target operation
* completes.
*/
PICurrent_Guard (TAO_ServerRequest &server_request,
bool tsc_to_rsc);
/// Destructor
/**
* The destructor copies (a logical copy whenever possible) data
* held in a given PICurrent when transitioning from one PICurrent
* scope to another immediately before any ending interception
* points are invoked, and after the starting and intermediate (if
* any) interception points are invoked.
*/
~PICurrent_Guard (void);
private:
/// The PICurrent implementation whose slot table will be copied.
PICurrent_Impl *src_;
/// The PICurrent implementation whose slot table will be filled
/// with the contents of another PICurrent's slot table.
PICurrent_Impl *dest_;
/// Callback object responsible for performing deep copies of a
/// PICurrent's slot table.
PICurrent_Copy_Callback *copy_callback_;
/// Flag that indicates if the TSC is to be copied to the RSC.
/**
* If false, then the RSC must be deep copied upon leaving the
* request scope and entering the thread scope. This is necessary
* since the RSC slot table is no longer available upon leaving
* the thread scope, meaning that a logical copy is not enough.
*/
const bool tsc_to_rsc_;
};
}
#endif /* TAO_HAS_INTERCEPTORS == 1 */
#include /**/ "ace/post.h"
#endif /* TAO_PI_CURRENT_GUARD_H */
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