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// This may look like C, but it's really -*- C++ -*-
// $Id$
// ============================================================================
//
// = LIBRARY
// TAO
//
// = FILENAME
// Environment.h
//
// = DESCRIPTION
// 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 "tao/corbafwd.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
class TAO_ORB_Core;
class TAO_Export CORBA_Environment
{
// = TITLE
// CORBA_Environment
//
// = DESCRIPTION
// 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.
public:
// = Initialization and termination methods.
CORBA_Environment (void);
// The default constructor, the environment will hold no exceptions.
CORBA_Environment (const CORBA_Environment &ACE_TRY_ENV);
// Copy constructor.
CORBA_Environment &operator=(const CORBA_Environment &ACE_TRY_ENV);
// Assingment.
~CORBA_Environment (void);
// Destructor, release the exception.
static CORBA_Environment * _duplicate (CORBA_Environment *);
static CORBA_Environment * _nil (void);
// Some static methods that need to be defined in every pseudo object
CORBA_Exception* exception (void) const;
// Return the exception. Caller must call <_incr_refcnf> in order
// to keep the ptr.
void exception (CORBA_Exception *ex);
// Set the exception to <ex>, taking a reference on it.
int exception_type (void) const;
// Return if the exception is a user exception or a system
// exception.
const char *exception_id (void) const;
// return the repository ID for the exception.
void clear (void);
// Clear the exception.
void print_exception (const char *info,
FILE *f=stdout) const;
// Print the exception to output determined by f. This function is
// not CORBA compliant.
// = Obtain a default environment to use with TAO.
static CORBA_Environment &default_environment (void);
// = Reference counting.
CORBA::ULong _incr_refcnt (void);
CORBA::ULong _decr_refcnt (void);
#if !defined(__GNUC__) || __GNUC__ > 2 || __GNUC_MINOR__ >= 8
typedef CORBA_Environment_ptr _ptr_type;
typedef CORBA_Environment_var _var_type;
#endif /* __GNUC__ */
// Useful for template programming.
private:
friend class TAO_ORB_Core;
CORBA_Environment (TAO_ORB_Core *orb_core);
// Initialize using a well known ORB Core; this is intended for the
// bootstraping of the ORB_Core, not for general consumption.
CORBA_Exception *exception_;
// Pointer to the exception object contained in the environment.
CORBA_Environment *previous_;
// The previous environment on the "default environment stack".
CORBA::ULong refcount_;
// Reference counting.
ACE_SYNCH_MUTEX refcount_lock_;
// Protect the reference count.
};
class TAO_Export CORBA_Environment_var
{
// = TITLE
// CORBA_Environment_var
//
// = DESCRIPTION
// Provide for automatic storage deallocation on going out of
// scope.
public:
CORBA_Environment_var (void);
// default constructor
CORBA_Environment_var (CORBA_Environment_ptr);
CORBA_Environment_var (const CORBA_Environment_var &);
// copy constructor
~CORBA_Environment_var (void);
// destructor
CORBA_Environment_var &operator= (CORBA_Environment_ptr);
CORBA_Environment_var &operator= (const CORBA_Environment_var &);
CORBA_Environment_ptr operator-> (void) const;
operator const CORBA_Environment_ptr &() const;
operator CORBA_Environment_ptr &();
// in, inout, out, _retn
CORBA_Environment_ptr in (void) const;
CORBA_Environment_ptr &inout (void);
CORBA_Environment_ptr &out (void);
CORBA_Environment_ptr _retn (void);
CORBA_Environment_ptr ptr (void) const;
private:
CORBA_Environment_ptr ptr_;
};
class TAO_Export CORBA_Environment_out
{
// = TITLE
// CORBA_Environment_out
//
// = DESCRIPTION
// The _out class for CORBA_Environment. This is used to help in
// managing the out parameters.
public:
CORBA_Environment_out (CORBA_Environment_ptr &);
CORBA_Environment_out (CORBA_Environment_var &);
CORBA_Environment_out (const CORBA_Environment_out &);
CORBA_Environment_out &operator= (const CORBA_Environment_out &);
CORBA_Environment_out &operator= (CORBA_Environment_ptr);
operator CORBA_Environment_ptr &();
CORBA_Environment_ptr &ptr (void);
CORBA_Environment_ptr operator-> (void);
private:
CORBA_Environment_ptr &ptr_;
CORBA_Environment_out &operator= (const CORBA_Environment_var &);
// Assignment from _var not allowed.
};
#if defined (__ACE_INLINE__)
# include "tao/Environment.i"
#endif /* __ACE_INLINE__ */
#endif /* TAO_ENVIRONMENT_H */
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