src/actorref.cpp

/*                                                                            *\
**                          Copyright (C) 2009-2010                           **
**       Dominik Charousset < Dominik.Charousset (at) haw-hamburg.de >        **
**                                                                            **
**            MMM       MMMMMM   MMMMMMMMM MMMMMMM   MMM       MMM            **
**           MMMMM     MMMMMMMM  MMMMMMMMM MMMMMMMM  MMM      MMMMM           **
**          MMM MMM   MMM        MMMM      MMM   MMM MMM     MMM MMM          **
**         MMM   MMM  MMM        MMMMMMMMM MMM   MMM MMM    MMM   MMM         **
**        MMMMMMMMMMM MMMM   MMM MMMM      MMM   MMM MMM   MMMMMMMMMMM        **
**       MMM       MMM MMMMMMMM  MMMMMMMMM MMMMMMMM  MMM  MMM       MMM       **
**      MMM         MMM MMMMMM   MMMMMMMMM MMMMMMM   MMM MMM         MMM      **
**                                                                            **
**                                                                            **
** This file is part of the acedia library.                                   **
**                                                                            **
** This library is free software: you can redistribute it and/or modify       **
** it under the terms of the GNU Lesser General Public License as published   **
** by the Free Software Foundation, either version 3 of the License, or       **
** (at your option) any later version.                                        **
**                                                                            **
** 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 acedia. If not, see <http://www.gnu.org/licenses/>.             **
\*                                                                            */

#define ACEDIA_REDUCED_ANNOUNCE

#include "actorref.hpp"
#include "acedia.hpp"
#include "actorproxy.hpp"

namespace acedia
{
    namespace details
    {
        class DummyActor : public AbstractActor
        {
         protected:
            virtual void enqueue(const Message&) { }
            virtual void linkTo(const ActorRef&) { }
            virtual bool backlinkTo(ActorRef &) { return false; }
         public:
            DummyActor() : AbstractActor(false, true) { }
        };
    }
}

static acedia::util::Singleton<acedia::details::DummyActor> m_dummyActor;

namespace acedia
{
    ActorRef::ActorRef(const ActorRef &other) :
            actor(other.actor), m_weak(false)
    {
        if (isValid()) actor->ref();
        else m_weak = true;
    }

    ActorRef::~ActorRef()
    {
        if (!m_weak && !actor->deref()) delete actor;
    }

    ActorRef::ActorRef() throw() :
            actor(m_dummyActor.instance()), m_weak(true)
    {
    }

    ActorRef &ActorRef::operator=(const ActorRef &other)
    {
        if (!m_weak && !actor->deref()) delete actor;
        actor = other.actor;
        if (isValid())
        {
            m_weak = false;
            other.actor->ref();
        }
        else
        {
            m_weak = true;
        }
        return *this;
    }

    bool ActorRef::isValid() const
    {
        return actor != m_dummyActor.instance();
    }

    boost::uint32_t ActorRef::actorId() const
    {
        return isValid() ? actor->id() : 0;
    }

    boost::uint32_t ActorRef::realActorId() const
    {
        return isFarRef()
                ? dynamic_cast<ActorProxy*>(actor)->originalActorId()
                : actorId();
    }

}

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