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/*
* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license, you may redistribute it and/or modify it under version 2 of the License, or (at your option), any later version.
* Copyright (C) 2021+ WarheadCore <https://github.com/WarheadCore>
*/
#ifndef _TRANSACTION_H
#define _TRANSACTION_H
#include "DatabaseEnvFwd.h"
#include "Define.h"
#include "SQLOperation.h"
#include "StringFormat.h"
#include <functional>
#include <mutex>
#include <vector>
/*! Transactions, high level class. */
class AC_DATABASE_API TransactionBase
{
friend class TransactionTask;
friend class MySQLConnection;
template <typename T>
friend class DatabaseWorkerPool;
public:
TransactionBase() : _cleanedUp(false) { }
virtual ~TransactionBase() { Cleanup(); }
void Append(char const* sql);
template<typename Format, typename... Args>
void PAppend(Format&& sql, Args&&... args)
{
Append(Acore::StringFormat(std::forward<Format>(sql), std::forward<Args>(args)...).c_str());
}
std::size_t GetSize() const { return m_queries.size(); }
protected:
void AppendPreparedStatement(PreparedStatementBase* statement);
void Cleanup();
std::vector<SQLElementData> m_queries;
private:
bool _cleanedUp;
};
template<typename T>
class Transaction : public TransactionBase
{
public:
using TransactionBase::Append;
void Append(PreparedStatement<T>* statement)
{
AppendPreparedStatement(statement);
}
};
/*! Low level class*/
class AC_DATABASE_API TransactionTask : public SQLOperation
{
template <class T> friend class DatabaseWorkerPool;
friend class DatabaseWorker;
friend class TransactionCallback;
public:
TransactionTask(std::shared_ptr<TransactionBase> trans) : m_trans(trans) { }
~TransactionTask() { }
protected:
bool Execute() override;
int TryExecute();
void CleanupOnFailure();
std::shared_ptr<TransactionBase> m_trans;
static std::mutex _deadlockLock;
};
class AC_DATABASE_API TransactionWithResultTask : public TransactionTask
{
public:
TransactionWithResultTask(std::shared_ptr<TransactionBase> trans) : TransactionTask(trans) { }
TransactionFuture GetFuture() { return m_result.get_future(); }
protected:
bool Execute() override;
TransactionPromise m_result;
};
class AC_DATABASE_API TransactionCallback
{
public:
TransactionCallback(TransactionFuture&& future) : m_future(std::move(future)) { }
TransactionCallback(TransactionCallback&&) = default;
TransactionCallback& operator=(TransactionCallback&&) = default;
void AfterComplete(std::function<void(bool)> callback) &
{
m_callback = std::move(callback);
}
bool InvokeIfReady();
TransactionFuture m_future;
std::function<void(bool)> m_callback;
};
#endif
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