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/*
* Copyright (C) 2008-2017 TrinityCore <http://www.trinitycore.org/>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program 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, see <http://www.gnu.org/licenses/>.
*/
#include "QueryCallback.h"
template<typename T>
inline void Destroy(T& t)
{
t.~T();
}
template<typename T>
void DestroyActiveMember(T& obj)
{
if (!obj._isPrepared)
Destroy(obj._string);
else
Destroy(obj._prepared);
}
template<typename T>
void MoveFrom(T& to, T&& from)
{
DestroyActiveMember(to);
to._isPrepared = from._isPrepared;
if (!to._isPrepared)
to._string = std::move(from._string);
else
to._prepared = std::move(from._prepared);
}
struct QueryCallbackNew::QueryCallbackData
{
public:
friend class QueryCallbackNew;
QueryCallbackData(std::function<void(QueryResult)>&& callback) : _string(std::move(callback)), _isPrepared(false) { }
QueryCallbackData(std::function<void(PreparedQueryResult)>&& callback) : _prepared(std::move(callback)), _isPrepared(true) { }
QueryCallbackData(QueryCallbackData&& right) { MoveFrom(*this, std::move(right)); }
QueryCallbackData& operator=(QueryCallbackData&& right) { MoveFrom(*this, std::move(right)); }
~QueryCallbackData() { DestroyActiveMember(*this); }
private:
QueryCallbackData(QueryCallbackData const&) = delete;
QueryCallbackData& operator=(QueryCallbackData const&) = delete;
template<typename T> friend void MoveFrom(T& to, T&& from);
template<typename T> friend void DestroyActiveMember(T& obj);
union
{
std::function<void(QueryResult)> _string;
std::function<void(PreparedQueryResult)> _prepared;
};
bool _isPrepared;
};
QueryCallbackNew::QueryCallbackNew(std::future<QueryResult>&& result) : _string(std::move(result)), _isPrepared(false)
{
}
QueryCallbackNew::QueryCallbackNew(std::future<PreparedQueryResult>&& result) : _prepared(std::move(result)), _isPrepared(true)
{
}
QueryCallbackNew::QueryCallbackNew(QueryCallbackNew&& right)
{
MoveFrom(*this, std::move(right));
_callbacks = std::move(right._callbacks);
}
QueryCallbackNew& QueryCallbackNew::operator=(QueryCallbackNew&& right)
{
MoveFrom(*this, std::move(right));
_callbacks = std::move(right._callbacks);
return *this;
}
QueryCallbackNew::~QueryCallbackNew()
{
DestroyActiveMember(*this);
}
QueryCallbackNew&& QueryCallbackNew::WithCallback(std::function<void(QueryResult)>&& callback)
{
ASSERT(!_callbacks.empty() || !_isPrepared, "Attempted to set callback function for string query on a prepared async query");
_callbacks.emplace(std::move(callback));
return std::move(*this);
}
QueryCallbackNew&& QueryCallbackNew::WithPreparedCallback(std::function<void(PreparedQueryResult)>&& callback)
{
ASSERT(!_callbacks.empty() || _isPrepared, "Attempted to set callback function for prepared query on a string async query");
_callbacks.emplace(std::move(callback));
return std::move(*this);
}
QueryCallbackNew::Status QueryCallbackNew::InvokeIfReady()
{
QueryCallbackData& callback = _callbacks.front();
if (!_isPrepared)
{
if (_string.valid() && _string.wait_for(std::chrono::seconds(0)) == std::future_status::ready)
{
std::function<void(QueryResult)> cb(std::move(callback._string));
cb(_string.get());
_callbacks.pop();
if (_callbacks.empty())
{
ASSERT(!_isPrepared ? !_string.valid() : !_prepared.valid());
return Completed;
}
ASSERT(_isPrepared == _callbacks.front()._isPrepared);
return NextStep;
}
}
else
{
if (_prepared.valid() && _prepared.wait_for(std::chrono::seconds(0)) == std::future_status::ready)
{
std::future<PreparedQueryResult> f(std::move(_prepared));
std::function<void(PreparedQueryResult)> cb(std::move(callback._prepared));
cb(_prepared.get());
_callbacks.pop();
if (_callbacks.empty())
{
ASSERT(!_isPrepared ? !_string.valid() : !_prepared.valid());
return Completed;
}
ASSERT(_isPrepared == _callbacks.front()._isPrepared);
return NextStep;
}
}
return NotReady;
}
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