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// -*- C++ -*-
//=============================================================================
/**
* @file Framework_Component.h
*
* $Id$
*
* A prototype mechanism that allows framework components, singletons
* such as ACE_Reactor, ACE_Proactor, etc, to be registered with a
* central repository managed by the <ACE_Object_Manager> or
* ACE_Service_Config that will handle destruction.
*
* This technique obviates changing ACE_Object_Manager and
* ACE_Service_Config everytime a new framework is added. Which also
* means that unused framework components don't need to linked into
* the final application which is important for applications with
* stringent footprint requirements.
*
* Framework components need only provide a static method,
* close_singleton() and add the ACE_REGISTER_FRAMEWORK_COMPONENT macro
* call to their instance() methods in order to participate. Components
* that don't have a close_singleton() method can also participate via
* template specialization of ACE_Framework_Component_T.
*
* This design uses the External Polymorphism pattern to avoid having
* to derive all framework components from a common base class that
* has virtual methods (this is crucial to avoid unnecessary overhead),
* and is based on the dump debugging implementation found in
* <ace/Dump.h>.
*
* @author Don Hinton <dhinton@ieee.org>.
*/
//=============================================================================
#ifndef ACE_FRAMEWORK_COMPONENT_H
#define ACE_FRAMEWORK_COMPONENT_H
#include /**/ "ace/pre.h"
#include "ace/ACE_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/os_include/os_signal.h"
#include "ace/Thread_Mutex.h"
#define ACE_DEFAULT_FRAMEWORK_REPOSITORY_SIZE 1024
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Framework_Component
*
* @brief Base class that defines a uniform interface for all managed
* framework components.
*/
class ACE_Export ACE_Framework_Component
{
public:
friend class ACE_Framework_Repository;
/// Constructor.
ACE_Framework_Component (void *_this,
const ACE_TCHAR *dll_name = 0,
const ACE_TCHAR *name = 0);
/// Close the contained singleton.
virtual void close_singleton (void) = 0;
protected:
/// Destructor.
virtual ~ACE_Framework_Component (void);
private:
// No copy possible
ACE_Framework_Component (const ACE_Framework_Component &);
void operator= (const ACE_Framework_Component &);
private:
/// Pointer to the actual component.
const void *this_;
/// Library associated with this component
const ACE_TCHAR *dll_name_;
/// Component name
const ACE_TCHAR *name_;
};
/**
* @class ACE_Framework_Repository
*
* @brief Contains all framework components used by an application.
*
* This class contains a vector of ACE_Framework_Component *'s. On
* destruction, framework components are destroyed in the reverse order
* that they were added originally.
*/
class ACE_Export ACE_Framework_Repository
{
public:
// This is just to silence a compiler warning about no public ctors
friend class ACE_Framework_Component;
enum
{
DEFAULT_SIZE = ACE_DEFAULT_FRAMEWORK_REPOSITORY_SIZE
};
/// Close down the repository and free up dynamically allocated
/// resources.
~ACE_Framework_Repository (void);
/// Initialize the repository.
int open (int size = DEFAULT_SIZE);
/// Close down the repository and free up dynamically allocated
/// resources, also called by dtor.
int close (void);
/// Get pointer to a process-wide <ACE_Framework_Repository>.
static ACE_Framework_Repository *instance
(int size = ACE_Framework_Repository::DEFAULT_SIZE);
/// Delete the dynamically allocated Singleton.
static void close_singleton (void);
// = Search structure operations (all acquire locks as necessary).
/// Insert a new component. Returns -1 when the repository is full
/// and 0 on success.
int register_component (ACE_Framework_Component *fc);
/// Remove a component. Returns -1 on error or if component not found
/// and 0 on success.
int remove_component (const ACE_TCHAR *name);
/// Remove all components associated with a particular dll.
int remove_dll_components (const ACE_TCHAR *dll_name);
/// Return the current size of the repository.
int current_size (void) const;
/// Return the total size of the repository.
int total_size (void) const;
/// Dump the state of an object.
void dump (void) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
protected:
/// Initialize the repository.
ACE_Framework_Repository (int size = ACE_Framework_Repository::DEFAULT_SIZE);
private:
/// Actually removes the dll components, must be called with locks held.
int remove_dll_components_i (const ACE_TCHAR *dll_name);
/// Compact component_vector_ after components have been removed__maintains
/// order.
void compact (void);
/// Disallow copying and assignment.
ACE_Framework_Repository (const ACE_Framework_Repository &);
ACE_Framework_Repository &operator= (const ACE_Framework_Repository &);
private:
/// Contains all the framework components.
ACE_Framework_Component **component_vector_;
/// Current number of components.
int current_size_;
/// Maximum number of components.
int total_size_;
/// Pointer to a process-wide ACE_Framework_Repository.
static ACE_Framework_Repository *repository_;
/// Flag set when repository is the process of shutting down. This
/// is necessary to keep from self-deadlocking since some of
/// the components might make calls back to the repository to
/// unload their components, e.g., ACE_DLL_Manager.
static sig_atomic_t shutting_down_;
#if defined (ACE_MT_SAFE) && (ACE_MT_SAFE != 0)
/// Synchronization variable for the MT_SAFE Repository
ACE_Thread_Mutex lock_;
#endif /* ACE_MT_SAFE */
};
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "ace/Framework_Component.inl"
#endif /* __ACE_INLINE__ */
// Include the templates classes at this point.
#include "ace/Framework_Component_T.h"
#include /**/ "ace/post.h"
#endif /* ACE_FRAMEWORK_COMPONENT_H */
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