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/****************************************************************************
**
** Copyright (C) 2020 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.
**
****************************************************************************/
#include "imagecachegenerator.h"
#include "imagecachecollectorinterface.h"
#include "imagecachestorage.h"
#include <QThread>
namespace QmlDesigner {
ImageCacheGenerator::~ImageCacheGenerator()
{
std::lock_guard threadLock{*m_threadMutex.get()};
if (m_backgroundThread)
m_backgroundThread->wait();
clean();
}
void ImageCacheGenerator::generateImage(Utils::SmallStringView name,
Sqlite::TimeStamp timeStamp,
ImageCacheGeneratorInterface::CaptureCallback &&captureCallback,
AbortCallback &&abortCallback)
{
{
std::lock_guard lock{m_dataMutex};
m_tasks.emplace_back(name, timeStamp, std::move(captureCallback), std::move(abortCallback));
}
startGenerationAsynchronously();
}
void ImageCacheGenerator::clean()
{
std::lock_guard dataLock{m_dataMutex};
m_tasks.clear();
}
class ReleaseProcessing
{
public:
ReleaseProcessing(std::atomic_flag &processing)
: m_processing(processing)
{
m_processing.test_and_set(std::memory_order_acquire);
}
~ReleaseProcessing() { m_processing.clear(std::memory_order_release); }
private:
std::atomic_flag &m_processing;
};
void ImageCacheGenerator::startGeneration(std::shared_ptr<std::mutex> threadMutex)
{
ReleaseProcessing guard(m_processing);
while (true) {
Task task;
{
std::unique_lock threadLock{*threadMutex.get(), std::defer_lock_t{}};
if (!threadLock.try_lock())
return;
std::lock_guard dataLock{m_dataMutex};
if (m_tasks.empty()) {
m_storage.walCheckpointFull();
return;
}
task = std::move(m_tasks.back());
m_tasks.pop_back();
}
m_collector.start(
task.filePath,
[this, threadMutex, task](QImage &&image) {
std::unique_lock lock{*threadMutex.get(), std::defer_lock_t{}};
if (!lock.try_lock())
return;
if (threadMutex.use_count() == 1)
return;
if (image.isNull())
task.abortCallback();
else
task.captureCallback(image);
m_storage.storeImage(std::move(task.filePath), task.timeStamp, image);
},
[this, threadMutex, task] {
std::unique_lock lock{*threadMutex.get(), std::defer_lock_t{}};
if (!lock.try_lock())
return;
if (threadMutex.use_count() == 1)
return;
task.abortCallback();
m_storage.storeImage(std::move(task.filePath), task.timeStamp, {});
});
}
}
void ImageCacheGenerator::startGenerationAsynchronously()
{
if (m_processing.test_and_set(std::memory_order_acquire))
return;
std::unique_lock lock{*m_threadMutex.get(), std::defer_lock_t{}};
if (!lock.try_lock())
return;
if (m_backgroundThread)
m_backgroundThread->wait();
m_backgroundThread.reset(QThread::create(
[this](std::shared_ptr<std::mutex> threadMutex) { startGeneration(threadMutex); },
m_threadMutex));
m_backgroundThread->start();
// m_backgroundThread = std::thread(
// [this](std::shared_ptr<std::mutex> threadMutex) { startGeneration(threadMutex); },
// m_threadMutex);
}
} // namespace QmlDesigner
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