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// -*- C++ -*-
//=============================================================================
/**
* @file ORB_Table.h
*
* $Id$
*
* @author Ossama Othman
* @author Carlos O'Ryan
*/
//=============================================================================
#ifndef TAO_ORB_TABLE_H
#define TAO_ORB_TABLE_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/orbconf.h"
#include "tao/CORBA_String.h"
#include "ace/Array_Map.h"
#include "ace/Thread_Mutex.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
// Forward declarations.
class TAO_ORB_Core;
namespace TAO
{
class ORB_Core_Ref_Counter;
/**
* @class ORB_Table
*
* @brief Keep a table with all the ORBs in the system.
*
* CORBA::ORB_init() is supposed to return the same ORB if the
* user specifies the same ORBid, either in the ORB_init()
* parameter or in the -ORBid option.
* This class is used to implement that feature.
* It is also useful when trying to determine if an object
* reference is collocated or not.
*
* @note This class should be instantiated via its instance()
* method. Normally this would be enforced by making the
* constructor protected but that forces a friend declaration
* containing a template type (TAO_Singleton) with a static
* member to be introduced. In turn, this potentially
* introduces problems in MS Windows DLL environments due to
* the occurance of multiple singleton instances. There
* should only be one!
*/
class TAO_Export ORB_Table
{
public:
/// Constructor
/**
* @note See the note in the class description for an explanation
* of why this constructor is not protected.
*/
ORB_Table (void);
typedef ACE_Array_Map<CORBA::String_var,
ORB_Core_Ref_Counter,
TAO::String_Var_Equal_To> Table;
typedef Table::key_type key_type;
typedef Table::data_type data_type;
typedef Table::value_type value_type;
typedef Table::size_type size_type;
typedef Table::iterator iterator;
/**
* @name The canonical ACE_Map methods.
*/
//@{
iterator begin (void);
iterator end (void);
int bind (const char *orb_id, ::TAO_ORB_Core *orb_core);
/// Return @c TAO_ORB_Core corresponding to ORB with given @a
/// orb_id.
/**
* @note The caller must decrease the reference count on the
* returned ORB_Core, i.e. the callers "owns" it.
*/
::TAO_ORB_Core* find (const char *orb_id);
int unbind (const char *orb_id);
//@}
::TAO_ORB_Core * const * get_orbs (size_t& num_orbs);
/// Obtain the first ORB for the @c ORB_Core_instance()
/// implementation.
::TAO_ORB_Core * first_orb (void);
/// Return a unique instance
static ORB_Table * instance (void);
/// Set the ORB related to the orb_id as the default ORB and not the
/// ORB that is first binded.
void set_default (char const * orb_id);
/// Method the ORB invokes to specify that it doesnt want to be the
/// default ORB if there are more than one ORB registered.
void not_default (char const * orb_id);
/// Accessor to the underlying table_
Table * table (void);
/// Return reference to underlying lock.
TAO_SYNCH_MUTEX & lock (void);
private:
// Prevent copying
ORB_Table (const ORB_Table &);
void operator= (const ORB_Table &);
/// Return @c TAO_ORB_Core corresponding to ORB with given @a
/// orb_id. (underlying unlocked implementation).
::TAO_ORB_Core * find_i (char const * orb_id);
private:
/// Lock used to synchronize access to the internal state.
::TAO_SYNCH_MUTEX lock_;
/// Variable to check if the first ORB decides not to be the
/// default.
bool first_orb_not_default_;
/// The underlying table.
Table table_;
/// The first ORB created by the user
::TAO_ORB_Core * first_orb_;
/// List of orbs for get_orbs call
/**
* @todo ORB_Table::orbs_ appears to be unused. Remove it?
*/
::TAO_ORB_Core ** orbs_;
/// Number of ORBs in the table.
size_t num_orbs_;
};
// -----------------------------------------------
/**
* @class ORB_Table_Ref_Counter
*
* @brief Class contained by ORB_Table's Unbounded_Set.
*
* Class contained by ORB_Table's Unbounded_Set.
*/
class ORB_Core_Ref_Counter
{
public:
/// Constructor.
ORB_Core_Ref_Counter (void);
/// Constructor.
ORB_Core_Ref_Counter (::TAO_ORB_Core * core);
/// Destructor.
~ORB_Core_Ref_Counter (void);
/// Copy constructor.
ORB_Core_Ref_Counter (ORB_Core_Ref_Counter const & rhs);
/// Assignment operator.
void operator= (ORB_Core_Ref_Counter const & rhs);
/// ORB_Core pointer accessor.
::TAO_ORB_Core * core (void) const { return this->core_; }
private:
::TAO_ORB_Core * core_;
};
}
TAO_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
# include "tao/ORB_Table.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /* TAO_ORB_TABLE_H */
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