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// -*- C++ -*-
//=============================================================================
/**
* @file Managed_Object.h
*
* @author David L. Levine <levine@cs.wustl.edu>
*/
//=============================================================================
#ifndef ACE_MANAGED_OBJECT_H
#define ACE_MANAGED_OBJECT_H
#include /**/ "ace/pre.h"
#include /**/ "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Object_Manager.h"
#include "ace/Global_Macros.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Cleanup_Adapter
*
* @brief Adapter for ACE_Cleanup objects that allows them to be readily
* managed by the ACE_Object_Manager.
*
* This template class adapts an object of any type to be an
* ACE_Cleanup object. The object can then be destroyed
* type-safely by the ACE_Object_Manager. This class is
* typically used to replace a cast; but, it's a bit cleaner and
* allows insertion of, say, run-time type identification
* internally if desired.
*/
template <class TYPE>
class ACE_Cleanup_Adapter : public ACE_Cleanup
{
public:
/// Default constructor.
ACE_Cleanup_Adapter ();
/// Virtual destructor, needed by some compilers for vtable placement.
virtual ~ACE_Cleanup_Adapter ();
/// Accessor for contained object.
TYPE &object ();
private:
ACE_Cleanup_Adapter (const ACE_Cleanup_Adapter<TYPE> &) = delete;
void operator= (const ACE_Cleanup_Adapter<TYPE> &) = delete;
/// Contained object.
TYPE object_;
};
/**
* @class ACE_Managed_Object
*
* @brief Wrapper for interface to allocate an object managed by the
* ACE_Object_Manager.
*
* This template class wraps an interface that is used to
* allocate and access an object that is managed by the
* ACE_Object_Manager. Because static template member functions
* are not supported by some compilers, it is a separate
* (template) class.
* This interface is typically used to replace a static object
* with one that is dynamically allocated. It helps to avoid
* problems with order of static object
* construction/destruction. Managed objects won't be allocated
* until needed, but should be allocated when first needed. And
* they are destroyed in the reverse order of construction.
* <get_preallocated_object> accesses a "preallocated" object,
* i.e., one that is identified by a value in the
* ACE_Object_Manager:: Preallocated_Object enum. These objects
* are used internally by the ACE library.
* Hooks are provided for the application to preallocate objects
* via the same mechanism.
* ACE_APPLICATION_PREALLOCATED_OBJECT_DECLARATIONS can be used
* to define enum values;
* ACE_APPLICATION_PREALLOCATED_OBJECT_DEFINITIONS can be used
* to define the corresponding objects. The format of the ACE
* internal library definitions should be followed. And
* similarly, ACE_APPLICATION_PREALLOCATED_ARRAY_DECLARATIONS
* and ACE_APPLICATION_PREALLOCATED_ARRAY_DEFINITIONS can be
* used to preallocate arrays.
* By default, preallocation uses dynamic allocation. The
* preallocated objects and arrays are allocated off the heap in
* the ACE_Object_Manager constructor. To statically place the
* preallocated objects in program global data instead of on the
* heap, #define ACE_HAS_STATIC_PREALLOCATION prior to building
* the ACE library.
*/
template <class TYPE>
class ACE_Managed_Object
{
public:
static TYPE *get_preallocated_object (ACE_Object_Manager::Preallocated_Object identifier)
{
// The preallocated objects are in a separate, "read-only" array so
// that this function doesn't need a lock. Also, because it is
// intended _only_ for use with hard-code values, it performs no
// range checking on "id".
// Cast the return type of the the object pointer based
// on the type of the function template parameter.
return &((ACE_Cleanup_Adapter<TYPE> *)
ACE_Object_Manager::preallocated_object[identifier])->object ();
}
// Get the preallocated object identified by "id". Returns a
// pointer to the object. Beware: no error indication is provided,
// because it can _only_ be used for accessing preallocated objects.
// @note The function definition is inlined here so that it compiles
// on AIX 4.1 w/xlC v. 3.01.
static TYPE *get_preallocated_array (ACE_Object_Manager::Preallocated_Array identifier)
{
// The preallocated array are in a separate, "read-only" array so
// that this function doesn't need a lock. Also, because it is
// intended _only_ for use with hard-code values, it performs no
// range checking on "id".
// Cast the return type of the the object pointer based
// on the type of the function template parameter.
return &((ACE_Cleanup_Adapter<TYPE> *)
ACE_Object_Manager::preallocated_array[identifier])->object ();
}
// Get the preallocated array identified by "id". Returns a
// pointer to the array. Beware: no error indication is provided,
// because it can _only_ be used for accessing preallocated arrays.
// @note The function definition is inlined here so that it compiles
// on AIX 4.1 w/xlC v. 3.01.
protected:
// Disallow instantiation of this class.
ACE_Managed_Object (void) = delete;
private:
ACE_Managed_Object (const ACE_Managed_Object<TYPE> &) = delete;
void operator= (const ACE_Managed_Object<TYPE> &) = delete;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "ace/Managed_Object.inl"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Managed_Object.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Managed_Object.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#include /**/ "ace/post.h"
#endif /* ACE_MANAGED_OBJECT_H */
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