/****************************************************************************
**
** 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 "clangiasyncjob.h"

#include <utils/runextensions.h>

#include <QFutureWatcher>
#include <QObject>

namespace ClangBackEnd {

template<class Result>
class AsyncJob : public IAsyncJob
{
public:
    AsyncJob() {}
    ~AsyncJob() {}

    using Runner = std::function<Result()>;
    Runner runner() const { return m_runner; }
    void setRunner(const Runner &runner) { m_runner = runner; }

    Result asyncResult() const { return m_futureWatcher.future().result(); }

    QFuture<void> runAsync() final
    {
        const auto onFinished = [this]() {
            finalizeAsyncRun();
            setIsFinished(true);
            finishedHandler()(this);
        };
        QObject::connect(&m_futureWatcher,
                         &QFutureWatcher<Result>::finished,
                         onFinished);

        // Use 16MB stack size as clang_annotateTokens() would with an internal thread.
        const Utils::StackSizeInBytes stackSize = 1024 * 1024 * 16;
        const QFuture<Result> future = Utils::runAsync(stackSize, m_runner);
        m_futureWatcher.setFuture(future);

        return future;
    }

    void preventFinalization() final
    {
        m_futureWatcher.disconnect();
    }

private:
    Runner m_runner;
    QFutureWatcher<Result> m_futureWatcher;
};

} // namespace ClangBackEnd
