libcryfs/impl/IdList.h

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#pragma once
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#ifndef MESSMER_FSPP_IMPL_IDLIST_H_
#define MESSMER_FSPP_IMPL_IDLIST_H_
#include <map>
#include <mutex>
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#include <stdexcept>
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#include <messmer/cpp-utils/pointer/unique_ref.h>
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namespace fspp {
template<class Entry>
class IdList final {
public:
IdList();
virtual ~IdList();
int add(cpputils::unique_ref<Entry> entry);
Entry *get(int id);
const Entry *get(int id) const;
void remove(int id);
private:
std::map<int, cpputils::unique_ref<Entry>> _entries;
int _id_counter;
mutable std::mutex _mutex;
DISALLOW_COPY_AND_ASSIGN(IdList<Entry>);
};
template<class Entry>
IdList<Entry>::IdList()
: _entries(), _id_counter(0), _mutex() {
}
template<class Entry>
IdList<Entry>::~IdList() {
}
template<class Entry>
int IdList<Entry>::add(cpputils::unique_ref<Entry> entry) {
std::lock_guard<std::mutex> lock(_mutex);
//TODO Reuse IDs (ids = descriptors)
int new_id = ++_id_counter;
_entries.insert(std::make_pair(new_id, std::move(entry)));
return new_id;
}
template<class Entry>
Entry *IdList<Entry>::get(int id) {
return const_cast<Entry*>(const_cast<const IdList<Entry>*>(this)->get(id));
}
template<class Entry>
const Entry *IdList<Entry>::get(int id) const {
std::lock_guard<std::mutex> lock(_mutex);
const Entry *result = _entries.at(id).get();
return result;
}
template<class Entry>
void IdList<Entry>::remove(int id) {
std::lock_guard<std::mutex> lock(_mutex);
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auto found_iter = _entries.find(id);
if (found_iter == _entries.end()) {
throw std::out_of_range("Called IdList::remove() with an invalid ID");
}
_entries.erase(found_iter);
}
}
#endif