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/* vim: set sw=4 sts=4 et foldmethod=syntax : */
/*
* Copyright (c) 2009 Piotr Jaroszyński
*
* This file is part of the Paludis package manager. Paludis is free software;
* you can redistribute it and/or modify it under the terms of the GNU General
* Public License version 2, as published by the Free Software Foundation.
*
* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <paludis/repositories/e/memoised_hashes.hh>
#include <paludis/util/mutex.hh>
#include <paludis/util/pimp-impl.hh>
#include <paludis/util/singleton-impl.hh>
#include <paludis/util/safe_ifstream.hh>
#include <paludis/util/digest_registry.hh>
#include <paludis/util/timestamp.hh>
#include <paludis/util/fs_path.hh>
#include <paludis/util/fs_stat.hh>
#include <map>
using namespace paludis;
using namespace paludis::erepository;
namespace paludis
{
typedef std::map<std::pair<std::string, std::string>, std::pair<Timestamp, std::string> > HashesMap;
template <>
struct Imp<MemoisedHashes>
{
mutable Mutex mutex;
mutable HashesMap hashes;
Imp()
{
}
};
}
MemoisedHashes::MemoisedHashes() :
_imp()
{
}
MemoisedHashes::~MemoisedHashes()
{
}
const std::string
MemoisedHashes::get(const std::string & algo, const FSPath & file, SafeIFStream & stream) const
{
std::pair<std::string, std::string> key(stringify(file), algo);
Timestamp mtime(file.stat().mtim());
Lock l(_imp->mutex);
HashesMap::iterator i(_imp->hashes.find(key));
if (i == _imp->hashes.end() || i->second.first != mtime)
{
std::pair<Timestamp, std::string> value(std::make_pair(mtime, DigestRegistry::get_instance()->get(algo)(stream)));
stream.clear();
stream.seekg(0, std::ios::beg);
if (i != _imp->hashes.end())
i->second = value;
else
i = _imp->hashes.insert(std::make_pair(key, value)).first;
}
return i->second.second;
}
namespace paludis
{
template class Pimp<MemoisedHashes>;
template class Singleton<MemoisedHashes>;
}
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