/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2018 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero 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
 * Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#pragma once

#include "MessageBroker.h"
#include "IMessage.h"
#include "IObservable.h"

namespace OrthancStone {

  class IObservable;

  class IObserver : public boost::noncopyable
  {
  protected:
    MessageBroker&                    broker_;

  public:
    IObserver(MessageBroker& broker)
      : broker_(broker)
    {
      broker_.Register(*this);
    }

    virtual ~IObserver()
    {
      broker_.Unregister(*this);
    }

    virtual void HandleMessage(IObservable& from, const IMessage& message) = 0;
  };

}