Mercurial > hg > orthanc-stone
view Framework/Messages/MessageBroker.h @ 872:733c6db3e5a3 am-dev
limiting the size of the cache
author | Alain Mazy <alain@mazy.be> |
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date | Mon, 01 Jul 2019 13:36:51 +0200 |
parents | d492c3b71c65 |
children | f6be9412e42a |
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/** * 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 "../StoneException.h" #include "boost/noncopyable.hpp" #include <set> namespace OrthancStone { class IObserver; /* * This is a central message broker. It keeps track of all observers and knows * when an observer is deleted. * This way, it can prevent an observable to send a message to a deleted observer. */ class MessageBroker : public boost::noncopyable { private: std::set<const IObserver*> activeObservers_; // the list of observers that are currently alive (that have not been deleted) public: MessageBroker() { } void Register(const IObserver& observer) { activeObservers_.insert(&observer); } void Unregister(const IObserver& observer) { activeObservers_.erase(&observer); } bool IsActive(const IObserver& observer) { return activeObservers_.find(&observer) != activeObservers_.end(); } }; }