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/*
* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
* Copyright (C) 2021+ WarheadCore <https://github.com/WarheadCore>
*/
#include "QueryCallback.h"
#include "Errors.h"
template<typename T, typename... Args>
inline void Construct(T& t, Args&&... args)
{
new (&t) T(std::forward<Args>(args)...);
}
template<typename T>
inline void Destroy(T& t)
{
t.~T();
}
template<typename T>
inline void ConstructActiveMember(T* obj)
{
if (!obj->_isPrepared)
Construct(obj->_string);
else
Construct(obj->_prepared);
}
template<typename T>
inline void DestroyActiveMember(T* obj)
{
if (!obj->_isPrepared)
Destroy(obj->_string);
else
Destroy(obj->_prepared);
}
template<typename T>
inline void MoveFrom(T* to, T&& from)
{
ASSERT(to->_isPrepared == from._isPrepared);
if (!to->_isPrepared)
to->_string = std::move(from._string);
else
to->_prepared = std::move(from._prepared);
}
struct QueryCallback::QueryCallbackData
{
public:
friend class QueryCallback;
QueryCallbackData(std::function<void(QueryCallback&, QueryResult)>&& callback) : _string(std::move(callback)), _isPrepared(false) { }
QueryCallbackData(std::function<void(QueryCallback&, PreparedQueryResult)>&& callback) : _prepared(std::move(callback)), _isPrepared(true) { }
QueryCallbackData(QueryCallbackData&& right)
{
_isPrepared = right._isPrepared;
ConstructActiveMember(this);
MoveFrom(this, std::move(right));
}
QueryCallbackData& operator=(QueryCallbackData&& right)
{
if (this != &right)
{
if (_isPrepared != right._isPrepared)
{
DestroyActiveMember(this);
_isPrepared = right._isPrepared;
ConstructActiveMember(this);
}
MoveFrom(this, std::move(right));
}
return *this;
}
~QueryCallbackData() { DestroyActiveMember(this); }
private:
QueryCallbackData(QueryCallbackData const&) = delete;
QueryCallbackData& operator=(QueryCallbackData const&) = delete;
template<typename T> friend void ConstructActiveMember(T* obj);
template<typename T> friend void DestroyActiveMember(T* obj);
template<typename T> friend void MoveFrom(T* to, T&& from);
union
{
std::function<void(QueryCallback&, QueryResult)> _string;
std::function<void(QueryCallback&, PreparedQueryResult)> _prepared;
};
bool _isPrepared;
};
// Not using initialization lists to work around segmentation faults when compiling with clang without precompiled headers
QueryCallback::QueryCallback(std::future<QueryResult>&& result)
{
_isPrepared = false;
Construct(_string, std::move(result));
}
QueryCallback::QueryCallback(std::future<PreparedQueryResult>&& result)
{
_isPrepared = true;
Construct(_prepared, std::move(result));
}
QueryCallback::QueryCallback(QueryCallback&& right)
{
_isPrepared = right._isPrepared;
ConstructActiveMember(this);
MoveFrom(this, std::move(right));
_callbacks = std::move(right._callbacks);
}
QueryCallback& QueryCallback::operator=(QueryCallback&& right)
{
if (this != &right)
{
if (_isPrepared != right._isPrepared)
{
DestroyActiveMember(this);
_isPrepared = right._isPrepared;
ConstructActiveMember(this);
}
MoveFrom(this, std::move(right));
_callbacks = std::move(right._callbacks);
}
return *this;
}
QueryCallback::~QueryCallback()
{
DestroyActiveMember(this);
}
QueryCallback&& QueryCallback::WithCallback(std::function<void(QueryResult)>&& callback)
{
return WithChainingCallback([callback](QueryCallback& /*this*/, QueryResult result) { callback(std::move(result)); });
}
QueryCallback&& QueryCallback::WithPreparedCallback(std::function<void(PreparedQueryResult)>&& callback)
{
return WithChainingPreparedCallback([callback](QueryCallback& /*this*/, PreparedQueryResult result) { callback(std::move(result)); });
}
QueryCallback&& QueryCallback::WithChainingCallback(std::function<void(QueryCallback&, 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);
}
QueryCallback&& QueryCallback::WithChainingPreparedCallback(std::function<void(QueryCallback&, 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);
}
void QueryCallback::SetNextQuery(QueryCallback&& next)
{
MoveFrom(this, std::move(next));
}
bool QueryCallback::InvokeIfReady()
{
QueryCallbackData& callback = _callbacks.front();
auto checkStateAndReturnCompletion = [this]()
{
_callbacks.pop();
bool hasNext = !_isPrepared ? _string.valid() : _prepared.valid();
if (_callbacks.empty())
{
ASSERT(!hasNext);
return true;
}
// abort chain
if (!hasNext)
return true;
ASSERT(_isPrepared == _callbacks.front()._isPrepared);
return false;
};
if (!_isPrepared)
{
if (_string.valid() && _string.wait_for(std::chrono::seconds(0)) == std::future_status::ready)
{
QueryResultFuture f(std::move(_string));
std::function<void(QueryCallback&, QueryResult)> cb(std::move(callback._string));
cb(*this, f.get());
return checkStateAndReturnCompletion();
}
}
else
{
if (_prepared.valid() && _prepared.wait_for(std::chrono::seconds(0)) == std::future_status::ready)
{
PreparedQueryResultFuture f(std::move(_prepared));
std::function<void(QueryCallback&, PreparedQueryResult)> cb(std::move(callback._prepared));
cb(*this, f.get());
return checkStateAndReturnCompletion();
}
}
return false;
}
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