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/*************************************************
* DL Group Cache Source File *
* (C) 1999-2005 The Botan Project *
*************************************************/
#include <botan/dl_param.h>
#include <botan/mutex.h>
#include <botan/init.h>
#include <map>
namespace Botan {
/*************************************************
* Try to obtain a particular DL group *
*************************************************/
extern DL_Group try_to_get_dl_group(const std::string&);
namespace {
/*************************************************
* Cache for DL_Group objects *
*************************************************/
class DL_Group_Cache
{
public:
const DL_Group& get(const std::string&);
void add(const std::string&, const DL_Group&);
DL_Group_Cache() { groups_mutex = get_mutex(); }
~DL_Group_Cache() { groups.clear(); delete groups_mutex; }
private:
std::map<std::string, DL_Group> groups;
Mutex* groups_mutex;
};
/*************************************************
* Get a DL_Group *
*************************************************/
const DL_Group& DL_Group_Cache::get(const std::string& name)
{
Mutex_Holder lock(groups_mutex);
std::map<std::string, DL_Group>::const_iterator group;
group = groups.find(name);
if(group != groups.end())
return group->second;
groups.insert(std::make_pair(name, try_to_get_dl_group(name)));
group = groups.find(name);
if(group != groups.end())
return group->second;
throw Lookup_Error("DL group \"" + name + "\" not found");
}
/*************************************************
* Add a new DL_Group *
*************************************************/
void DL_Group_Cache::add(const std::string& name, const DL_Group& group)
{
Mutex_Holder lock(groups_mutex);
groups.insert(std::make_pair(name, group));
}
/*************************************************
* Global state for DL_Group cache *
*************************************************/
DL_Group_Cache* dl_groups = 0;
}
/*************************************************
* Retrieve a DL group by name *
*************************************************/
const DL_Group& get_dl_group(const std::string& name)
{
return dl_groups->get(name);
}
/*************************************************
* Register a named DL group *
*************************************************/
void add_dl_group(const std::string& name, const DL_Group& group)
{
dl_groups->add(name, group);
}
namespace Init {
/*************************************************
* Create the cache *
*************************************************/
void startup_dl_cache()
{
dl_groups = new DL_Group_Cache;
}
/*************************************************
* Destroy the cache *
*************************************************/
void shutdown_dl_cache()
{
delete dl_groups;
dl_groups = 0;
}
}
}
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