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annotate Framework/Messages/MessageBroker.h @ 403:99e31898910e

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IObservable.cpp
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sun, 11 Nov 2018 12:13:31 +0100
parents 3897f9f28cfa
children b70e9be013e4
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2018 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #pragma once
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23
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24 #include "boost/noncopyable.hpp"
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26 #include <set>
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28 namespace OrthancStone
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29 {
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30 class IObserver;
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31
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32 /*
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33 * This is a central message broker. It keeps track of all observers and knows
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34 * when an observer is deleted.
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35 * This way, it can prevent an observable to send a message to a deleted observer.
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36 */
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37 class MessageBroker : public boost::noncopyable
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38 {
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39 private:
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40 std::set<const IObserver*> activeObservers_; // the list of observers that are currently alive (that have not been deleted)
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41
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42 public:
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43 void Register(const IObserver& observer)
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44 {
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45 activeObservers_.insert(&observer);
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46 }
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47
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48 void Unregister(const IObserver& observer)
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49 {
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50 activeObservers_.erase(&observer);
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51 }
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52
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53 bool IsActive(const IObserver& observer)
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54 {
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55 return activeObservers_.find(&observer) != activeObservers_.end();
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56 }
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57 };
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58 }