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85 lines
3 KiB
C++
85 lines
3 KiB
C++
/*
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* Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 or (at your option)
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* version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef KEEPASSXC_ASYNCTASK_HPP
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#define KEEPASSXC_ASYNCTASK_HPP
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#include <QFuture>
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#include <QFutureWatcher>
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#include <QtConcurrent/QtConcurrent>
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/**
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* Asynchronously run computations outside the GUI thread.
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*/
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namespace AsyncTask
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{
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/**
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* Wait for the given future without blocking the event loop.
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*
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* @param future future to wait for
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* @return async task result
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*/
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template <typename FunctionObject>
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typename std::result_of<FunctionObject()>::type
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waitForFuture(QFuture<typename std::result_of<FunctionObject()>::type> future)
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{
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QEventLoop loop;
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QFutureWatcher<typename std::result_of<FunctionObject()>::type> watcher;
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QObject::connect(&watcher, SIGNAL(finished()), &loop, SLOT(quit()));
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watcher.setFuture(future);
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loop.exec();
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return future.result();
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}
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/**
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* Run a given task and wait for it to finish without blocking the event loop.
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*
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* @param task std::function object to run
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* @return async task result
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*/
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template <typename FunctionObject>
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typename std::result_of<FunctionObject()>::type runAndWaitForFuture(FunctionObject task)
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{
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return waitForFuture<FunctionObject>(QtConcurrent::run(task));
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}
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/**
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* Run a given task then call the defined callback. Prevents event loop blocking and
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* ensures the validity of the follow-on task through the context. If the context is
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* deleted, the callback will not be processed preventing use after free errors.
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*
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* @param task std::function object to run
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* @param context QObject responsible for calling this function
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* @param callback std::function object to run after the task completess
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*/
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template <typename FunctionObject, typename FunctionObject2>
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void runThenCallback(FunctionObject task, QObject* context, FunctionObject2 callback)
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{
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typedef QFutureWatcher<typename std::result_of<FunctionObject()>::type> FutureWatcher;
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auto future = QtConcurrent::run(task);
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auto watcher = new FutureWatcher(context);
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QObject::connect(watcher, &QFutureWatcherBase::finished, context, [=]() {
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watcher->deleteLater();
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callback(future.result());
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});
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watcher->setFuture(future);
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}
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}; // namespace AsyncTask
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#endif // KEEPASSXC_ASYNCTASK_HPP
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