Dynamic_Service_Base.h

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00001 /* -*- C++ -*- */
00002 
00003 //=============================================================================
00004 /**
00005  *  @file Dynamic_Service_Base.h
00006  *
00007  *  $Id: Dynamic_Service_Base.h 78936 2007-07-18 13:00:06Z johnnyw $
00008  *
00009  *  @author Prashant Jain <pjain@cs.wustl.edu>
00010  *  @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
00011  */
00012 //=============================================================================
00013 
00014 #ifndef ACE_DYNAMIC_SERVICE_BASE_H
00015 #define ACE_DYNAMIC_SERVICE_BASE_H
00016 
00017 #include /**/ "ace/pre.h"
00018 
00019 #include /**/ "ace/ACE_export.h"
00020 
00021 #if !defined (ACE_LACKS_PRAGMA_ONCE)
00022 # pragma once
00023 #endif /* ACE_LACKS_PRAGMA_ONCE */
00024 
00025 ACE_BEGIN_VERSIONED_NAMESPACE_DECL
00026 
00027 class ACE_Service_Gestalt;
00028 class ACE_Service_Type;
00029 
00030 /**
00031  * @class ACE_Dynamic_Service_Base
00032  *
00033  * @brief Base class for all ACE_Dynamic_Service instantiations.
00034  *
00035  * Factors out common code shared by all ACE_Dynamic_Service
00036  * instantiations, this avoid code bloat.
00037  */
00038 class ACE_Export ACE_Dynamic_Service_Base
00039 {
00040 
00041 public:
00042   /// Dump the current static of the object
00043   void dump (void) const;
00044 
00045 protected:
00046   /// Return instance using @a name to search the (default) Service_Repository.
00047   static void* instance (const ACE_TCHAR *name);
00048 
00049   /// Perform the default repo search, but optionally skip searching the global
00050   /// repo.
00051   static void* instance (const ACE_TCHAR *name, bool no_global);
00052 
00053   /// Return instance using @a name to search the specific @a repo instance.
00054   static void* instance (const ACE_Service_Gestalt* repo,
00055                          const ACE_TCHAR *name);
00056 
00057   static void* instance (const ACE_Service_Gestalt* repo,
00058                          const ACE_TCHAR *name,
00059                          bool no_global);
00060 
00061   /// No need to create, or assign instances of this class
00062   ACE_Dynamic_Service_Base (void);
00063   ~ACE_Dynamic_Service_Base (void);
00064   const ACE_Dynamic_Service_Base& operator= (const ACE_Dynamic_Service_Base&);
00065 
00066 private:
00067   /// Implement the service search policy, i.e. "look for the service first
00068   /// locally and then globally"
00069   static const ACE_Service_Type *find_i (const ACE_Service_Gestalt* &repo,
00070                                          const ACE_TCHAR *name,
00071                                          bool no_global);
00072 
00073   /// The dependency declaration class needs access to the service search
00074   /// policy, implemented by find_i()
00075   friend class ACE_Dynamic_Service_Dependency;
00076 };
00077 
00078 ACE_END_VERSIONED_NAMESPACE_DECL
00079 
00080 #include /**/ "ace/post.h"
00081 #endif /* ACE_DYNAMIC_SERVICE_BASE_H */

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