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/************************************************************************
*
* Copyright (C) 2009-2024 IRCAD France
* Copyright (C) 2012-2021 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
// cspell:ignore NOLINT
#include "object.hpp"
#include "tools/uuid.hpp"
#include <map>
#include <mutex>
namespace sight::core
{
static std::map<const object*, std::string> s_ptr_to_uuid;
static std::map<std::string, object::wptr> s_uuid_to_wptr;
static std::mutex s_maps_mutex;
//------------------------------------------------------------------------------
object::sptr object::from_uuid(const std::string& _uuid)
{
// Find the weak pointer associated to this uuid
std::lock_guard guard(s_maps_mutex);
const auto found = s_uuid_to_wptr.find(_uuid);
if(found != s_uuid_to_wptr.cend())
{
// If we found it, return it now
return found->second.lock();
}
return {};
}
//------------------------------------------------------------------------------
std::string object::get_uuid() const
{
// First, try to find the uuid
std::lock_guard guard(s_maps_mutex);
const auto found = s_ptr_to_uuid.find(this);
if(found != s_ptr_to_uuid.cend())
{
// If we found it, return it now
return found->second;
}
// If not found, generate a new one
std::string uuid;
// Since we can manually set an uuid, we must ensure that the generated one did not generate an existing one.
// Almost impossible, but possible
do
{
uuid = tools::uuid::generate();
}
while(s_uuid_to_wptr.find(uuid) != s_uuid_to_wptr.end());
// Store the uuid
s_ptr_to_uuid[this] = uuid;
// Store also a weak pointer
// As we don't modify the underlying object, but only store a non const weak pointer,
// the "const" contract is not really broken in this method.
// This is a compromise to allow a "lazy" uuid generation
s_uuid_to_wptr[uuid] = const_cast<object*>(this)->get_sptr(); // NOLINT(cppcoreguidelines-pro-type-const-cast)
return uuid;
}
//------------------------------------------------------------------------------
void object::set_uuid(const std::string& _uuid, const bool _force)
{
std::lock_guard guard(s_maps_mutex);
if(!_force)
{
// Look if the uuid has already been used
const auto found_wptr = s_uuid_to_wptr.find(_uuid);
if(found_wptr != s_uuid_to_wptr.cend())
{
// Try to see if the object is different
object::sptr old = found_wptr->second.lock();
if(old && this != old.get())
{
/// That's no good, we set an already used uuid
SIGHT_FATAL("UUID '" << _uuid << "' is already used for object '" << old->get_id() << "'");
}
}
// Look if the object has already been registered
const auto found_uuid = s_ptr_to_uuid.find(this);
if(found_uuid != s_ptr_to_uuid.cend())
{
// Try to see if the uuid is different
const std::string& old = found_uuid->second;
if(!old.empty() && _uuid != old)
{
/// That's no good, the object has already be registered with a different uuid
SIGHT_FATAL("Object '" << get_id() << "' is already registered with UUID '" << old << "'");
}
}
}
s_ptr_to_uuid[this] = _uuid;
s_uuid_to_wptr[_uuid] = get_sptr();
}
object::~object()
{
std::lock_guard guard(s_maps_mutex);
const auto found = s_ptr_to_uuid.find(this);
// If we found it, erase us.
if(found != s_ptr_to_uuid.cend())
{
s_uuid_to_wptr.erase(found->second);
s_ptr_to_uuid.erase(found);
}
}
} //namespace sight::core
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