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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmDynamicLoader.h"
#include <map>
#include <string>
#include <utility>
class cmDynamicLoaderCache
{
public:
~cmDynamicLoaderCache();
void CacheFile(const char* path, cmsys::DynamicLoader::LibraryHandle /*p*/);
bool GetCacheFile(const char* path,
cmsys::DynamicLoader::LibraryHandle& /*p*/);
bool FlushCache(const char* path);
void FlushCache();
static cmDynamicLoaderCache* GetInstance();
private:
std::map<std::string, cmsys::DynamicLoader::LibraryHandle> CacheMap;
static cmDynamicLoaderCache* Instance;
};
cmDynamicLoaderCache* cmDynamicLoaderCache::Instance = nullptr;
cmDynamicLoaderCache::~cmDynamicLoaderCache() = default;
void cmDynamicLoaderCache::CacheFile(const char* path,
cmsys::DynamicLoader::LibraryHandle p)
{
cmsys::DynamicLoader::LibraryHandle h;
if (this->GetCacheFile(path, h)) {
this->FlushCache(path);
}
this->CacheMap[path] = p;
}
bool cmDynamicLoaderCache::GetCacheFile(const char* path,
cmsys::DynamicLoader::LibraryHandle& p)
{
auto it = this->CacheMap.find(path);
if (it != this->CacheMap.end()) {
p = it->second;
return true;
}
return false;
}
bool cmDynamicLoaderCache::FlushCache(const char* path)
{
auto it = this->CacheMap.find(path);
bool ret = false;
if (it != this->CacheMap.end()) {
cmsys::DynamicLoader::CloseLibrary(it->second);
this->CacheMap.erase(it);
ret = true;
}
return ret;
}
void cmDynamicLoaderCache::FlushCache()
{
for (auto const& it : this->CacheMap) {
cmsys::DynamicLoader::CloseLibrary(it.second);
}
delete cmDynamicLoaderCache::Instance;
cmDynamicLoaderCache::Instance = nullptr;
}
cmDynamicLoaderCache* cmDynamicLoaderCache::GetInstance()
{
if (!cmDynamicLoaderCache::Instance) {
cmDynamicLoaderCache::Instance = new cmDynamicLoaderCache;
}
return cmDynamicLoaderCache::Instance;
}
cmsys::DynamicLoader::LibraryHandle cmDynamicLoader::OpenLibrary(
const char* libname)
{
cmsys::DynamicLoader::LibraryHandle lh;
if (cmDynamicLoaderCache::GetInstance()->GetCacheFile(libname, lh)) {
return lh;
}
lh = cmsys::DynamicLoader::OpenLibrary(libname);
cmDynamicLoaderCache::GetInstance()->CacheFile(libname, lh);
return lh;
}
void cmDynamicLoader::FlushCache()
{
cmDynamicLoaderCache::GetInstance()->FlushCache();
}
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