Mercurial > hg > orthanc-stone
annotate Framework/Messages/MessageBroker.h @ 1132:58799b7317fa
merge
author | Alain Mazy <alain@mazy.be> |
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date | Wed, 06 Nov 2019 10:47:05 +0100 |
parents | f6be9412e42a |
children | e713f1a99861 2d8ab34c8c91 |
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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 |
439 | 5 * Copyright (C) 2017-2019 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 |
828 | 21 #pragma once |
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22 |
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23 #include "boost/noncopyable.hpp" |
403 | 24 |
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25 #include <set> |
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26 |
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27 namespace OrthancStone |
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28 { |
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29 class IObserver; |
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30 |
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31 /* |
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32 * This is a central message broker. It keeps track of all observers and knows |
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33 * when an observer is deleted. |
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34 * This way, it can prevent an observable to send a message to a deleted observer. |
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35 */ |
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36 class MessageBroker : public boost::noncopyable |
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37 { |
403 | 38 private: |
39 std::set<const IObserver*> activeObservers_; // the list of observers that are currently alive (that have not been deleted) | |
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40 |
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41 public: |
828 | 42 MessageBroker() |
43 { | |
44 } | |
45 | |
403 | 46 void Register(const IObserver& observer) |
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47 { |
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48 activeObservers_.insert(&observer); |
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49 } |
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50 |
403 | 51 void Unregister(const IObserver& observer) |
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52 { |
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53 activeObservers_.erase(&observer); |
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54 } |
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55 |
403 | 56 bool IsActive(const IObserver& observer) |
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57 { |
403 | 58 return activeObservers_.find(&observer) != activeObservers_.end(); |
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59 } |
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60 }; |
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61 } |