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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#pragma once
#include "sqliteglobal.h"
#include <exception>
#include <mutex>
namespace Sqlite {
class DatabaseBackend;
class Database;
class TransactionInterface
{
public:
TransactionInterface() = default;
TransactionInterface(const TransactionInterface &) = delete;
TransactionInterface &operator=(const TransactionInterface &) = delete;
virtual void deferredBegin() = 0;
virtual void immediateBegin() = 0;
virtual void exclusiveBegin() = 0;
virtual void commit() = 0;
virtual void rollback() = 0;
virtual void lock() = 0;
virtual void unlock() = 0;
protected:
~TransactionInterface() = default;
};
class AbstractTransaction
{
public:
AbstractTransaction(const AbstractTransaction &) = delete;
AbstractTransaction &operator=(const AbstractTransaction &) = delete;
void commit()
{
m_interface.commit();
m_isAlreadyCommited = true;
m_locker.unlock();
}
protected:
~AbstractTransaction() = default;
AbstractTransaction(TransactionInterface &interface)
: m_interface(interface)
{
}
protected:
TransactionInterface &m_interface;
std::unique_lock<TransactionInterface> m_locker{m_interface};
bool m_isAlreadyCommited = false;
bool m_rollback = false;
};
class AbstractThrowingTransaction : public AbstractTransaction
{
public:
AbstractThrowingTransaction(const AbstractThrowingTransaction &) = delete;
AbstractThrowingTransaction &operator=(const AbstractThrowingTransaction &) = delete;
~AbstractThrowingTransaction() noexcept(false)
{
try {
if (m_rollback)
m_interface.rollback();
} catch (...) {
if (!std::uncaught_exception())
throw;
}
}
protected:
AbstractThrowingTransaction(TransactionInterface &interface)
: AbstractTransaction(interface)
{
}
};
class AbstractNonThrowingDestructorTransaction : public AbstractTransaction
{
public:
AbstractNonThrowingDestructorTransaction(const AbstractNonThrowingDestructorTransaction &) = delete;
AbstractNonThrowingDestructorTransaction &operator=(const AbstractNonThrowingDestructorTransaction &) = delete;
~AbstractNonThrowingDestructorTransaction()
{
try {
if (m_rollback)
m_interface.rollback();
} catch (...) {
}
}
protected:
AbstractNonThrowingDestructorTransaction(TransactionInterface &interface)
: AbstractTransaction(interface)
{
}
};
template <typename BaseTransaction>
class BasicDeferredTransaction final : public BaseTransaction
{
public:
BasicDeferredTransaction(TransactionInterface &interface)
: BaseTransaction(interface)
{
interface.deferredBegin();
}
~BasicDeferredTransaction()
{
BaseTransaction::m_rollback = !BaseTransaction::m_isAlreadyCommited;
}
};
using DeferredTransaction = BasicDeferredTransaction<AbstractThrowingTransaction>;
using DeferredNonThrowingDestructorTransaction = BasicDeferredTransaction<AbstractNonThrowingDestructorTransaction>;
template <typename BaseTransaction>
class BasicImmediateTransaction final : public BaseTransaction
{
public:
BasicImmediateTransaction(TransactionInterface &interface)
: BaseTransaction(interface)
{
interface.immediateBegin();
}
~BasicImmediateTransaction()
{
BaseTransaction::m_rollback = !BaseTransaction::m_isAlreadyCommited;
}
};
using ImmediateTransaction = BasicImmediateTransaction<AbstractThrowingTransaction>;
using ImmediateNonThrowingDestructorTransaction = BasicImmediateTransaction<AbstractNonThrowingDestructorTransaction>;
template <typename BaseTransaction>
class BasicExclusiveTransaction final : public BaseTransaction
{
public:
BasicExclusiveTransaction(TransactionInterface &interface)
: BaseTransaction(interface)
{
interface.exclusiveBegin();
}
~BasicExclusiveTransaction()
{
BaseTransaction::m_rollback = !BaseTransaction::m_isAlreadyCommited;
}
};
using ExclusiveTransaction = BasicExclusiveTransaction<AbstractThrowingTransaction>;
using ExclusiveNonThrowingDestructorTransaction = BasicExclusiveTransaction<AbstractNonThrowingDestructorTransaction>;
} // namespace Sqlite
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