/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2020 Osimis S.A., Belgium
 *
 * This program 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 program 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 program. If not, see
 * <http://www.gnu.org/licenses/>.
 **/


#pragma once

#include "IObserver.h"
#include "IMessage.h"

#include <boost/weak_ptr.hpp>

namespace OrthancStone
{
  /**
   This class may be used to customize the way the messages are sent between
   a source and a destination, for instance by the ThreadedOracle.

   See the concrete class LockingEmitter for an example of when it is useful.
   */
  class IMessageEmitter : public boost::noncopyable
  {
  public:
    virtual ~IMessageEmitter()
    {
    }

    virtual void EmitMessage(boost::weak_ptr<IObserver> observer,
                             const IMessage& message) = 0;
  };
}