Source/cmDynamicLoader.cxx

   1 /*=========================================================================
   2
   3   Program:   CMake - Cross-Platform Makefile Generator
   4   Module:    $RCSfile: cmDynamicLoader.cxx,v $
   5   Language:  C++
   6   Date:      $Date: 2006-03-16 22:09:08 $
   7   Version:   $Revision: 1.29 $
   8
   9   Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  10   See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
  11
  12      This software is distributed WITHOUT ANY WARRANTY; without even
  13      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  14      PURPOSE.  See the above copyright notices for more information.
  15
  16 =========================================================================*/
  17 #include "cmDynamicLoader.h"
  18
  19 class cmDynamicLoaderCache
  20 {
  21 public:
  22   ~cmDynamicLoaderCache();
  23   void CacheFile(const char* path,
  24     const cmsys::DynamicLoader::LibraryHandle&);
  25   bool GetCacheFile(const char* path, cmsys::DynamicLoader::LibraryHandle&);
  26   bool FlushCache(const char* path);
  27   void FlushCache();
  28   static cmDynamicLoaderCache* GetInstance();
  29
  30 private:
  31   std::map<cmStdString, cmsys::DynamicLoader::LibraryHandle> CacheMap;
  32   static cmDynamicLoaderCache* Instance;
  33 };
  34
  35 cmDynamicLoaderCache* cmDynamicLoaderCache::Instance = 0;
  36
  37 cmDynamicLoaderCache::~cmDynamicLoaderCache()
  38 {
  39 }
  40
  41 void cmDynamicLoaderCache::CacheFile(const char* path,
  42   const cmsys::DynamicLoader::LibraryHandle& p)
  43 {
  44   cmsys::DynamicLoader::LibraryHandle h;
  45   if ( this->GetCacheFile(path, h) )
  46     {
  47     this->FlushCache(path);
  48     }
  49   this->CacheMap[path] = p;
  50 }
  51
  52 bool cmDynamicLoaderCache::GetCacheFile(const char* path,
  53   cmsys::DynamicLoader::LibraryHandle& p)
  54 {
  55   std::map<cmStdString, cmsys::DynamicLoader::LibraryHandle>::iterator it
  56     = this->CacheMap.find(path);
  57   if ( it != this->CacheMap.end() )
  58     {
  59     p = it->second;
  60     return true;
  61     }
  62   return false;
  63 }
  64
  65 bool cmDynamicLoaderCache::FlushCache(const char* path)
  66 {
  67   std::map<cmStdString, cmsys::DynamicLoader::LibraryHandle>::iterator it
  68     = this->CacheMap.find(path);
  69   bool ret = false;
  70   if ( it != this->CacheMap.end() )
  71     {
  72     cmsys::DynamicLoader::CloseLibrary(it->second);
  73     this->CacheMap.erase(it);
  74     ret = true;
  75     }
  76   return ret;
  77 }
  78
  79 void cmDynamicLoaderCache::FlushCache()
  80 {
  81   for ( std::map<cmStdString,
  82     cmsys::DynamicLoader::LibraryHandle>::iterator it
  83     = this->CacheMap.begin();
  84         it != this->CacheMap.end(); it++ )
  85     {
  86     cmsys::DynamicLoader::CloseLibrary(it->second);
  87     }
  88   delete cmDynamicLoaderCache::Instance;
  89   cmDynamicLoaderCache::Instance = 0;
  90 }
  91
  92 cmDynamicLoaderCache* cmDynamicLoaderCache::GetInstance()
  93 {
  94   if ( !cmDynamicLoaderCache::Instance )
  95     {
  96     cmDynamicLoaderCache::Instance = new cmDynamicLoaderCache;
  97     }
  98   return cmDynamicLoaderCache::Instance;
  99 }
 100
 101 cmsys::DynamicLoader::LibraryHandle cmDynamicLoader::OpenLibrary(
 102   const char* libname )
 103 {
 104   cmsys::DynamicLoader::LibraryHandle lh;
 105   if ( cmDynamicLoaderCache::GetInstance()->GetCacheFile(libname, lh) )
 106     {
 107     return lh;
 108     }
 109   lh = cmsys::DynamicLoader::OpenLibrary(libname);
 110   cmDynamicLoaderCache::GetInstance()->CacheFile(libname, lh);
 111   return lh;
 112 }
 113
 114 void cmDynamicLoader::FlushCache()
 115 {
 116   cmDynamicLoaderCache::GetInstance()->FlushCache();
 117 }