/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2019 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 "../StoneEnumerations.h"
#include "ICallable.h"
#include "IObserver.h"
#include "MessageBroker.h"
#include "MessageForwarder.h"

#include <set>
#include <map>

namespace OrthancStone 
{
  class IObservable : public boost::noncopyable
  {
  private:
    typedef std::map<MessageIdentifier, std::set<ICallable*> >  Callables;

    typedef std::set<IMessageForwarder*>     Forwarders;

    MessageBroker&  broker_;
    Callables       callables_;
    Forwarders      forwarders_;

    void EmitMessageInternal(const IObserver* receiver,
                             const IMessage& message);

  public:
    IObservable(MessageBroker& broker) :
      broker_(broker)
    {
    }

    virtual ~IObservable();

    MessageBroker& GetBroker() const
    {
      return broker_;
    }

    // Takes ownsership
    void RegisterObserverCallback(ICallable* callable);

    void Unregister(IObserver* observer);

    void BroadcastMessage(const IMessage& message);

    void EmitMessage(const IObserver& observer,
                     const IMessage& message);

    // Takes ownsership
    void RegisterForwarder(IMessageForwarder* forwarder);
  };
}