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// -*- C++ -*-
//=============================================================================
/**
* @file Environment.h
*
* $Id$
*
* Declare the CORBA::Environment class. Note that this header file
* only requires a few forward declarations of CORBA classes, this
* is *very* important because even the ORB needs to know about it;
* make your changes with care. It is also a good idea trying to
* minimize cross dependencies between header files.
*
* @author Carlos O'Ryan <coryan@cs.wustl.edu>
*/
//=============================================================================
#ifndef TAO_ENVIRONMENT_H
#define TAO_ENVIRONMENT_H
#include /**/ "ace/pre.h"
#include "tao/TAO_Export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "tao/Basic_Types.h"
#include "tao/CORBA_methods.h"
#include "tao/orbconf.h"
#include "tao/Pseudo_VarOut_T.h"
#include "tao/default_environment.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
class TAO_ORB_Core;
namespace CORBA
{
class Exception;
class Environment;
typedef Environment *Environment_ptr;
typedef TAO_Pseudo_Var_T<Environment> Environment_var;
typedef TAO_Pseudo_Out_T<Environment> Environment_out;
/**
* @class Environment
*
* @brief Environment
*
* A CORBA::Environment is a way to automagically ensure that
* exception data is freed -- the "var" class for Exceptions. It
* adds just a bit of convenience function support, helping
* classify exceptions as well as reducing memory leakage.
* The thread has a default environment to simplify porting
* between platforms that support native C++ exceptions and those
* that don't. This is a TSS resource (always), but with a twist:
* if the user creates a new environment the old one is "pushed"
* (actually the new one remembers it), eventually the new
* environment destructor pops itself from the stack and we
* recover the old environment. This means that if the user
* create a new environment and somebody calls a function using
* the default one the exception will still be received in the
* environment created by the user. The only drawback is that
* environments life time must nest properly, this shouldn't be a
* problem because environments are usually created on the stack,
* but, the spec allows their creation on the heap and/or as class
* members; we need to investigate the tradeoffs and take a
* decision.
*/
class TAO_Export Environment
{
public:
/// The default constructor. The environment will hold no
/// exceptions.
Environment (void);
/// Copy constructor.
Environment (const Environment &ACE_TRY_ENV);
/// Assingment.
Environment &operator=(const Environment &ACE_TRY_ENV);
/// Destructor, release the exception.
~Environment (void);
/// Some static methods that need to be defined in every pseudo object
static Environment * _duplicate (Environment *);
static Environment * _nil (void);
/// Return the contained CORBA::Exception.
/**
* CORBA::Environment retains ownership of the exception, this is
* contrary to the normal memory management rules in the C++
* mapping, but actually mandated by the specification:
*
* "C++ Language Mapping" (formal/00-01-02). Section 1.27
* Environment (page 1-113)
*/
CORBA::Exception* exception (void) const;
/// Set the contained CORBA::Exception to <ex>
/**
* CORBA::Environment assumes ownership of the exception, this is
* contrary to the normal memory management rules in the C++
* mapping, but actually mandated by the specification:
*
* "C++ Language Mapping" (formal/00-01-02). Section 1.27
* Environment (page 1-113)
*
*/
void exception (CORBA::Exception *ex);
/// Return if the exception is a user exception or a system
/// exception.
int exception_type (void) const;
/// return the repository ID for the exception.
const char *exception_id (void) const;
/// Clear the exception.
void clear (void);
/// Print the exception to output determined by f. This function
/// is not CORBA compliant.
void print_exception (const char *info,
FILE *f=stdout) const;
// = Obtain a default environment to use with TAO.
static CORBA::Environment &default_environment (void);
// Useful for template programming.
typedef CORBA::Environment_ptr _ptr_type;
typedef CORBA::Environment_var _var_type;
typedef CORBA::Environment_out _out_type;
private:
/// Initialize using a well known ORB Core; this is intended for
/// the bootstraping of the ORB_Core, not for general
/// consumption.
Environment (TAO_ORB_Core *orb_core);
/// Pointer to the exception object contained in the environment.
CORBA::Exception *exception_;
/// The previous environment on the "default environment stack".
Environment *previous_;
};
} // End CORBA namespace
TAO_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
# include "tao/Environment.i"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /* TAO_ENVIRONMENT_H */
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