distributable.h

/* Copyright (c) 2015-2016 Daniel.Nachbaur@epfl.ch
 *
 * This file is part of Collage <https://github.com/Eyescale/Collage>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 2.1 as published
 * by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef CO_DISTRIBUTABLE_H
#define CO_DISTRIBUTABLE_H

#include <co/object.h>      // default base class
#include <co/dataIStream.h> // used inline
#include <co/dataOStream.h> // used inline
#include <servus/serializable.h> //used inline

namespace co
{

template< class T, class S = Object, typename... Args > class Distributable : public T, public S
{
public:
    Distributable( Args... args ) : T(), S( args... ), _dirty( false ) {}

    Distributable( const Distributable& rhs )
        : T( rhs ), S( rhs ), _dirty( false ) {}

    virtual ~Distributable() {}

    bool isDirty() const final { return S::isDirty() || _dirty; }

    uint128_t commit( const uint32_t incarnation = CO_COMMIT_NEXT ) final
    {
        const uint128_t& version = S::commit( incarnation );
        _dirty = false;
        return version;
    }

    void notifyChanged() override
    {
        T::notifyChanged();
        if( S::isMaster( ))
            _dirty = true;
    }

private:
    typename S::ChangeType getChangeType() const final { return S::INSTANCE; }

    void getInstanceData( co::DataOStream& os ) override
    {
        S::getInstanceData( os );
        const auto& data = T::toBinary();
        os << data.size << Array< const void >( data.ptr.get(), data.size );
    }

    void applyInstanceData( co::DataIStream& is ) override
    {
        S::applyInstanceData( is );
        const size_t size = is.read< size_t >();
        T::fromBinary( is.getRemainingBuffer( size ), size );
    }

    bool _dirty;
};

template< class T > inline
std::ostream& operator << ( std::ostream& os, const Distributable< T >& object )
{
    return os << static_cast< const T& >( object );
}
}

#endif