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annotate Framework/Messages/LockingEmitter.h @ 1075:81b29bc7c3d4 broker

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 17 Oct 2019 14:39:51 +0200
parents 229ea1389845
children f72d1ab42932
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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) 2017-2019 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
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21 #pragma once
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22
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23 #include "IMessageEmitter.h"
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24 #include "IObservable.h"
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25
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26 #include <Core/Enumerations.h> // For ORTHANC_OVERRIDE
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27
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28 #include <boost/thread/shared_mutex.hpp>
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29
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30 namespace OrthancStone
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31 {
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32 /**
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33 * This class is used when using the ThreadedOracle : since messages
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34 * can be sent from multiple Oracle threads, this IMessageEmitter
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35 * implementation serializes the callbacks.
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36 *
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37 * The internal mutex used in Oracle messaging can also be used to
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38 * protect the application data. Thus, this class can be used as a single
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39 * application-wide mutex.
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40 */
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41 class LockingEmitter : public IMessageEmitter
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42 {
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43 private:
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44 boost::shared_mutex mutex_;
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45 IObservable oracleObservable_;
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46
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47 public:
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48 virtual void EmitMessage(boost::weak_ptr<IObserver>& observer,
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49 const IMessage& message) ORTHANC_OVERRIDE;
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50
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51
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52 class ReaderLock : public boost::noncopyable
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53 {
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54 private:
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55 LockingEmitter& that_;
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56 boost::shared_lock<boost::shared_mutex> lock_;
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57
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58 public:
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59 ReaderLock(LockingEmitter& that) :
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60 that_(that),
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61 lock_(that.mutex_)
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62 {
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63 }
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64 };
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66
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67 class WriterLock : public boost::noncopyable
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68 {
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69 private:
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70 LockingEmitter& that_;
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71 boost::unique_lock<boost::shared_mutex> lock_;
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72
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73 public:
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74 WriterLock(LockingEmitter& that) :
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75 that_(that),
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76 lock_(that.mutex_)
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77 {
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78 }
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79
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80 IObservable& GetOracleObservable()
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81 {
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82 return that_.oracleObservable_;
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83 }
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84 };
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85 };
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86 }