synchronizedVar.h

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/* Copyright 2015 CyberTech Labs Ltd.
 *
 * Licensed 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. */

#pragma once

#include <QtCore/QScopedPointer>
#include <QtCore/QReadWriteLock>

#include "commandLineParser.h"

namespace trikKernel {

template<typename T> class SynchronizedVar
{
public:
    SynchronizedVar()
        : mValue(new T())
        , mBuffer(new T())
    {
    }

    inline T get()
    {
        mLock.lockForRead();
        T temp = *mValue;
        mLock.unlock();
        return temp;
    }

    inline T *operator->()
    {
        return mBuffer.data();
    }

    inline const T &operator*() const
    {
        return *mBuffer;
    }

    inline void sync()
    {
        mLock.lockForWrite();
        mValue.swap(mBuffer);
        mLock.unlock();
    }

    inline void reset()
    {
        mLock.lockForWrite();
        mValue.reset(new T());
        mBuffer.reset(new T());
        mLock.unlock();
    }

private:
    QScopedPointer<T> mValue;

    QScopedPointer<T> mBuffer;

    QReadWriteLock mLock;
};

}