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// -*- C++ -*-
//=============================================================================
/**
* @file TAO_Singleton.h
*
* $Id$
*
* Header file for the TAO-specific Singleton implementation.
* Based entirely on ace/Singleton.*.
*
* @author Ossama Othman <ossama@uci.edu>
*/
//=============================================================================
#ifndef TAO_SINGLETON_H
#define TAO_SINGLETON_H
#include /**/ "ace/pre.h"
#include "ace/TSS_T.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include /**/ "tao/Versioned_Namespace.h"
#include "ace/Cleanup.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class TAO_Singleton
*
* @brief TAO-specific Singleton class
*
* TAO_Singletons are used by TAO to register TAO-specific
* singleton instances with the TAO_Object_Manager. This
* ensures that TAO singletons are isolated from ACE's
* Object_Manager, thus allowing TAO to be safely dynamically
* unloaded.
*/
template <class TYPE, class ACE_LOCK>
class TAO_Singleton : public ACE_Cleanup
{
public:
/// Global access point to the Singleton.
static TYPE *instance (void);
/// Cleanup method, used by @c ace_cleanup_destroyer to destroy the
/// singleton.
virtual void cleanup (void *param = 0);
/// Dump the state of the object.
static void dump (void);
protected:
/// Default constructor.
TAO_Singleton (void);
/// Contained instance.
TYPE instance_;
#if !defined (ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES)
/// Pointer to the Singleton (ACE_Cleanup) instance.
static TAO_Singleton<TYPE, ACE_LOCK> *singleton_;
#endif /* ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES */
/// Get pointer to the TAO Singleton instance.
static TAO_Singleton<TYPE, ACE_LOCK> *&instance_i (void);
};
/**
* @class TAO_TSS_Singleton
*
* @brief TAO-specific Singleton class
*
* TAO_Singletons are used by TAO to register TAO-specific
* singleton instances with the TAO_Object_Manager. This
* ensures that TAO singletons are isolated from ACE's
* Object_Manager, thus allowing TAO to be safely dynamically
* unloaded.
*/
template <class TYPE, class ACE_LOCK>
class TAO_TSS_Singleton : public ACE_Cleanup,
private ACE_Copy_Disabled
{
public:
/// Global access point to the Singleton.
static TYPE *instance (void);
/// Cleanup method, used by @c ace_cleanup_destroyer to destroy the
/// singleton.
virtual void cleanup (void *param = 0);
/// Dump the state of the object.
static void dump (void);
protected:
/// Default constructor.
TAO_TSS_Singleton (void);
/// Contained instance.
ACE_TSS_TYPE (TYPE) instance_;
#if !defined (ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES)
/// Pointer to the Singleton (ACE_Cleanup) instance.
static TAO_TSS_Singleton<TYPE, ACE_LOCK> *singleton_;
#endif /* ACE_LACKS_STATIC_DATA_MEMBER_TEMPLATES */
/// Get pointer to the TAO TSS Singleton instance.
static TAO_TSS_Singleton<TYPE, ACE_LOCK> *&instance_i (void);
};
TAO_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "tao/TAO_Singleton.inl"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "tao/TAO_Singleton.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("TAO_Singleton.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#include /**/ "ace/post.h"
#endif /* TAO_SINGLETON_H */
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