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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#pragma once
#include "utils_global.h"
#include "futuresynchronizer.h"
#include "qtcassert.h"
#include "tasktree.h"
#include <QFutureWatcher>
#include <QtConcurrent>
namespace Utils {
QTCREATOR_UTILS_EXPORT QThreadPool *asyncThreadPool(QThread::Priority priority);
template <typename Function, typename ...Args>
auto asyncRun(QThreadPool *threadPool, QThread::Priority priority,
Function &&function, Args &&...args)
{
QThreadPool *pool = threadPool ? threadPool : asyncThreadPool(priority);
return QtConcurrent::run(pool, std::forward<Function>(function), std::forward<Args>(args)...);
}
template <typename Function, typename ...Args>
auto asyncRun(QThread::Priority priority, Function &&function, Args &&...args)
{
return asyncRun<Function, Args...>(nullptr, priority,
std::forward<Function>(function), std::forward<Args>(args)...);
}
template <typename Function, typename ...Args>
auto asyncRun(QThreadPool *threadPool, Function &&function, Args &&...args)
{
return asyncRun<Function, Args...>(threadPool, QThread::InheritPriority,
std::forward<Function>(function), std::forward<Args>(args)...);
}
template <typename Function, typename ...Args>
auto asyncRun(Function &&function, Args &&...args)
{
return asyncRun<Function, Args...>(nullptr, QThread::InheritPriority,
std::forward<Function>(function), std::forward<Args>(args)...);
}
/*!
Adds a handler for when a result is ready.
This creates a new QFutureWatcher. Do not use if you intend to react on multiple conditions
or create a QFutureWatcher already for other reasons.
*/
template <typename R, typename T>
const QFuture<T> &onResultReady(const QFuture<T> &future, R *receiver, void(R::*member)(const T &))
{
auto watcher = new QFutureWatcher<T>();
QObject::connect(watcher, &QFutureWatcherBase::finished, watcher, &QObject::deleteLater);
QObject::connect(watcher, &QFutureWatcherBase::resultReadyAt, receiver, [=](int index) {
(receiver->*member)(watcher->future().resultAt(index));
});
watcher->setFuture(future);
return future;
}
/*!
Adds a handler for when a result is ready. The guard object determines the lifetime of
the connection.
This creates a new QFutureWatcher. Do not use if you intend to react on multiple conditions
or create a QFutureWatcher already for other reasons.
*/
template <typename T, typename Function>
const QFuture<T> &onResultReady(const QFuture<T> &future, QObject *guard, Function f)
{
auto watcher = new QFutureWatcher<T>();
QObject::connect(watcher, &QFutureWatcherBase::finished, watcher, &QObject::deleteLater);
QObject::connect(watcher, &QFutureWatcherBase::resultReadyAt, guard, [f, watcher](int index) {
f(watcher->future().resultAt(index));
});
watcher->setFuture(future);
return future;
}
/*!
Adds a handler for when the future is finished.
This creates a new QFutureWatcher. Do not use if you intend to react on multiple conditions
or create a QFutureWatcher already for other reasons.
*/
template<typename R, typename T>
const QFuture<T> &onFinished(const QFuture<T> &future,
R *receiver, void (R::*member)(const QFuture<T> &))
{
auto watcher = new QFutureWatcher<T>();
QObject::connect(watcher, &QFutureWatcherBase::finished, watcher, &QObject::deleteLater);
QObject::connect(watcher, &QFutureWatcherBase::finished, receiver,
[=] { (receiver->*member)(watcher->future()); });
watcher->setFuture(future);
return future;
}
/*!
Adds a handler for when the future is finished. The guard object determines the lifetime of
the connection.
This creates a new QFutureWatcher. Do not use if you intend to react on multiple conditions
or create a QFutureWatcher already for other reasons.
*/
template<typename T, typename Function>
const QFuture<T> &onFinished(const QFuture<T> &future, QObject *guard, Function f)
{
auto watcher = new QFutureWatcher<T>();
QObject::connect(watcher, &QFutureWatcherBase::finished, watcher, &QObject::deleteLater);
QObject::connect(watcher, &QFutureWatcherBase::finished, guard, [f, watcher] {
f(watcher->future());
});
watcher->setFuture(future);
return future;
}
class QTCREATOR_UTILS_EXPORT AsyncBase : public QObject
{
Q_OBJECT
signals:
void started();
void done();
void resultReadyAt(int index);
};
template <typename ResultType>
class Async : public AsyncBase
{
public:
Async() {
connect(&m_watcher, &QFutureWatcherBase::finished, this, &AsyncBase::done);
connect(&m_watcher, &QFutureWatcherBase::resultReadyAt, this, &AsyncBase::resultReadyAt);
}
~Async()
{
if (isDone())
return;
m_watcher.cancel();
if (!m_synchronizer)
m_watcher.waitForFinished();
}
template <typename Function, typename ...Args>
void setConcurrentCallData(Function &&function, Args &&...args)
{
return wrapConcurrent(std::forward<Function>(function), std::forward<Args>(args)...);
}
void setFutureSynchronizer(FutureSynchronizer *synchorizer) { m_synchronizer = synchorizer; }
void setThreadPool(QThreadPool *pool) { m_threadPool = pool; }
void setPriority(QThread::Priority priority) { m_priority = priority; }
void start()
{
QTC_ASSERT(m_startHandler, qWarning("No start handler specified."); return);
m_watcher.setFuture(m_startHandler());
emit started();
if (m_synchronizer)
m_synchronizer->addFuture(m_watcher.future());
}
bool isDone() const { return m_watcher.isFinished(); }
bool isCanceled() const { return m_watcher.isCanceled(); }
QFuture<ResultType> future() const { return m_watcher.future(); }
ResultType result() const { return m_watcher.result(); }
ResultType resultAt(int index) const { return m_watcher.resultAt(index); }
QList<ResultType> results() const { return future().results(); }
bool isResultAvailable() const { return future().resultCount(); }
private:
template <typename Function, typename ...Args>
void wrapConcurrent(Function &&function, Args &&...args)
{
m_startHandler = [=] {
return asyncRun(m_threadPool, m_priority, function, args...);
};
}
template <typename Function, typename ...Args>
void wrapConcurrent(std::reference_wrapper<const Function> &&wrapper, Args &&...args)
{
m_startHandler = [=] {
return asyncRun(m_threadPool, m_priority, std::forward<const Function>(wrapper.get()),
args...);
};
}
using StartHandler = std::function<QFuture<ResultType>()>;
StartHandler m_startHandler;
FutureSynchronizer *m_synchronizer = nullptr;
QThreadPool *m_threadPool = nullptr;
QThread::Priority m_priority = QThread::InheritPriority;
QFutureWatcher<ResultType> m_watcher;
};
template <typename ResultType>
class AsyncTaskAdapter : public Tasking::TaskAdapter<Async<ResultType>>
{
public:
AsyncTaskAdapter() {
this->connect(this->task(), &AsyncBase::done, this, [this] {
emit this->done(!this->task()->isCanceled());
});
}
void start() final { this->task()->start(); }
};
} // namespace Utils
TASKING_DECLARE_TEMPLATE_TASK(AsyncTask, Utils::AsyncTaskAdapter);
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