ACE_DLL_Manager Class Reference

This class is a singleton and serves as a factory and repository for instances of ACE_DLL_Handle. More...

#include <DLL_Manager.h>

Collaboration diagram for ACE_DLL_Manager:

Collaboration graph
[legend]
List of all members.

Public Types

enum  { DEFAULT_SIZE = ACE_DEFAULT_DLL_MANAGER_SIZE }

Public Member Functions

ACE_DLL_Handleopen_dll (const ACE_TCHAR *dll_name, int openmode, ACE_SHLIB_HANDLE handle)
int close_dll (const ACE_TCHAR *dll_name)
 Close the underlying dll. Decrements the refcount.
u_long unload_policy (void) const
 Returns the current per-process UNLOAD_POLICY.
void unload_policy (u_long unload_policy)

Static Public Member Functions

static ACE_DLL_Managerinstance (int size=ACE_DLL_Manager::DEFAULT_SIZE)
 Return a unique instance.

Protected Member Functions

int open (int size)
int close (void)
ACE_DLL_Handlefind_dll (const ACE_TCHAR *dll_name) const
int unload_dll (ACE_DLL_Handle *dll_handle, int force_unload=0)

Private Member Functions

 ACE_DLL_Manager (int size=ACE_DLL_Manager::DEFAULT_SIZE)
 Default constructor.
 ~ACE_DLL_Manager (void)
 Destructor.
 ACE_DLL_Manager (const ACE_DLL_Manager &)
void operator= (const ACE_DLL_Manager &)

Static Private Member Functions

static void close_singleton (void)
 Close the singleton instance.

Private Attributes

ACE_DLL_Handle ** handle_vector_
 Vector containing all loaded handle objects.
int current_size_
 Current number of handles.
int total_size_
 Maximum number of handles.
u_long unload_policy_
 Unload strategy.

Static Private Attributes

static ACE_DLL_Managerinstance_ = 0
 Pointer to a process-wide <ACE_DLL_Manager>.

Friends

class ACE_Framework_Repository

Detailed Description

This class is a singleton and serves as a factory and repository for instances of ACE_DLL_Handle.

This class is a singleton whose lifetime is managed by the ACE_Framework_Repository. Although it is normally meant to be used directly only by ACE_DLL, applications can call the unload_policy() methods in order get/set the the dll unload policy. Unload policies include per_process/per-dll and eager/lazy. Dlls can export set their own policy by using the ACE_DLL_UNLOAD_POLICY macro found in config-all.h. If a dll choses to set an unload policy, it will be used when the per-dll policy (the default) is in effect. If the per-dll policy is in effect and a dll has not chosen to set a policy, the current per-process policy will be used.

The following policy macros are provided in config-all.h:

ACE_DLL_UNLOAD_POLICY_PER_PROCESS - Per-process policy that unloads dlls eagerly.

ACE_DLL_UNLOAD_POLICY_PER_DLL - Apply policy on a per-dll basis. If the dll doesn't use one of the macros below, the current per-process policy will be used.

ACE_DLL_UNLOAD_POLICY_LAZY - Don't unload dll when refcount reaches zero, i.e., wait for either an explicit unload request or program exit.

ACE_DLL_UNLOAD_POLICY_DEFAULT - Default policy allows dlls to control their own destinies, but will unload those that don't make a choice eagerly.


Member Enumeration Documentation

anonymous enum
 

Enumerator:
DEFAULT_SIZE 


Constructor & Destructor Documentation

ACE_DLL_Manager::ACE_DLL_Manager int  size = ACE_DLL_Manager::DEFAULT_SIZE  )  [private]
 

Default constructor.

ACE_DLL_Manager::~ACE_DLL_Manager void   )  [private]
 

Destructor.

ACE_DLL_Manager::ACE_DLL_Manager const ACE_DLL_Manager  )  [private]
 


Member Function Documentation

int ACE_DLL_Manager::close void   )  [protected]
 

int ACE_DLL_Manager::close_dll const ACE_TCHAR dll_name  ) 
 

Close the underlying dll. Decrements the refcount.

void ACE_DLL_Manager::close_singleton void   )  [static, private]
 

Close the singleton instance.

ACE_DLL_Handle * ACE_DLL_Manager::find_dll const ACE_TCHAR dll_name  )  const [protected]
 

ACE_DLL_Manager * ACE_DLL_Manager::instance int  size = ACE_DLL_Manager::DEFAULT_SIZE  )  [static]
 

Return a unique instance.

int ACE_DLL_Manager::open int  size  )  [protected]
 

ACE_DLL_Handle * ACE_DLL_Manager::open_dll const ACE_TCHAR dll_name,
int  openmode,
ACE_SHLIB_HANDLE  handle
 

Factory for ACE_DLL_Handle objects. If one already exits, its refcount is incremented.

void ACE_DLL_Manager::operator= const ACE_DLL_Manager  )  [private]
 

int ACE_DLL_Manager::unload_dll ACE_DLL_Handle dll_handle,
int  force_unload = 0
[protected]
 

void ACE_DLL_Manager::unload_policy u_long  unload_policy  ) 
 

Set the per-process UNLOAD_POLICY. If the policy is changed from LAZY to EAGER, then it will also unload any dlls with zero refcounts.

u_long ACE_DLL_Manager::unload_policy void   )  const
 

Returns the current per-process UNLOAD_POLICY.


Friends And Related Function Documentation

friend class ACE_Framework_Repository [friend]
 


Member Data Documentation

int ACE_DLL_Manager::current_size_ [private]
 

Current number of handles.

ACE_DLL_Handle** ACE_DLL_Manager::handle_vector_ [private]
 

Vector containing all loaded handle objects.

ACE_DLL_Manager * ACE_DLL_Manager::instance_ = 0 [static, private]
 

Pointer to a process-wide <ACE_DLL_Manager>.

int ACE_DLL_Manager::total_size_ [private]
 

Maximum number of handles.

u_long ACE_DLL_Manager::unload_policy_ [private]
 

Unload strategy.


The documentation for this class was generated from the following files:
Generated on Wed Nov 23 15:48:27 2005 for ACE by  doxygen 1.4.5