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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#pragma once
#include <com/sun/star/document/XActionLockable.hpp>
#include <mutex>
namespace framework{
/** @short implements a guard, which can use the interface
<type scope="css::document">XActionLockable</type>.
@descr This guard should be used to be sure, that any lock will be
released. Otherwise the locked document can hinder the office on shutdown!
*/
class ActionLockGuard final
{
// member
private:
std::mutex m_mutex;
/** @short points to the object, which can be locked from outside. */
css::uno::Reference< css::document::XActionLockable > m_xActionLock;
/** @short knows if a lock exists on the internal lock object
forced by this guard instance. */
bool m_bActionLocked;
// interface
public:
/** @short default ctor to initialize a "non working guard".
@descr That can be useful in cases, where no resource still exists,
but will be available next time. Then this guard can be used
in a mode "use guard for more than one resources".
*/
ActionLockGuard()
: m_bActionLocked(false)
{
}
/** @short release this guard instance and make sure, that no lock
will exist afterwards on the internal wrapped resource.
*/
~ActionLockGuard()
{
unlock();
}
/** @short set a new resource for locking at this guard.
@descr This call will fail, if an internal resource already exists
and is currently locked.
@param xLock
points to the outside resource, which should be locked.
@return sal_True, if new resource could be set and locked.
sal_False otherwise.
*/
bool setResource(const css::uno::Reference< css::document::XActionLockable >& xLock)
{
std::unique_lock g(m_mutex);
if (m_bActionLocked || !xLock.is())
return false;
m_xActionLock = xLock;
m_xActionLock->addActionLock();
m_bActionLocked = m_xActionLock->isActionLocked();
return true;
}
/** @short set a new resource for locking at this guard.
@descr This call will fail, if an internal resource already exists
and is currently locked.
@param xLock
points to the outside resource, which should be locked.
@return sal_True, if new resource could be set and locked.
sal_False otherwise.
*/
void freeResource()
{
// SAFE -> ..........................
std::unique_lock aMutexLock(m_mutex);
css::uno::Reference< css::document::XActionLockable > xLock = m_xActionLock;
bool bLocked = m_bActionLocked;
m_xActionLock.clear();
m_bActionLocked = false;
aMutexLock.unlock();
// <- SAFE ..........................
if (bLocked && xLock.is())
xLock->removeActionLock();
}
/** @short unlock the internal wrapped resource, if it's not already done. */
void unlock()
{
std::unique_lock g(m_mutex);
if (m_bActionLocked && m_xActionLock.is())
{
m_xActionLock->removeActionLock();
// don't check for any locks here ...
// May another guard use the same lock object :-(
m_bActionLocked = false;
}
}
};
} // namespace framework
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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