Mercurial > hg > orthanc-stone

annotate Framework/Messages/LockingEmitter.h @ 1284:1bb54005e2bd bugs/2020-02-invisible-slice

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merged default into branch
author Benjamin Golinvaux <bgo@osimis.io>
date Tue, 11 Feb 2020 14:38:36 +0100
parents 2d8ab34c8c91
children
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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) 2017-2020 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 <Core/Enumerations.h>
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24 #include <Core/OrthancException.h>
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25
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26 #include "IMessageEmitter.h"
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27 #include "IObservable.h"
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28
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29 #include <boost/thread.hpp>
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30
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31 namespace OrthancStone
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32 {
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33 /**
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34 * This class is used when using the ThreadedOracle : since messages
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35 * can be sent from multiple Oracle threads, this IMessageEmitter
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36 * implementation serializes the callbacks.
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37 *
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38 * The internal mutex used in Oracle messaging can also be used to
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39 * protect the application data. Thus, this class can be used as a single
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40 * application-wide mutex.
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41 */
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42 class LockingEmitter : public IMessageEmitter
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43 {
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44 private:
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45 boost::shared_mutex mutex_;
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46 MessageBroker broker_;
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47 IObservable oracleObservable_;
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48
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49 public:
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50 LockingEmitter() :
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51 oracleObservable_(broker_)
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52 {
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53 }
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54
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55 MessageBroker& GetBroker()
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56 {
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57 return broker_;
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58 }
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59
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60 virtual void EmitMessage(const IObserver& observer,
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61 const IMessage& message) ORTHANC_OVERRIDE
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62 {
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63 try
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64 {
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65 boost::unique_lock<boost::shared_mutex> lock(mutex_);
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66 oracleObservable_.EmitMessage(observer, message);
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67 }
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68 catch (Orthanc::OrthancException& e)
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69 {
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70 LOG(ERROR) << "Exception while emitting a message: " << e.What();
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71 }
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72 }
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73
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74
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75 class ReaderLock : public boost::noncopyable
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76 {
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77 private:
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78 LockingEmitter& that_;
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79 boost::shared_lock<boost::shared_mutex> lock_;
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80
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81 public:
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82 ReaderLock(LockingEmitter& that) :
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83 that_(that),
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84 lock_(that.mutex_)
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85 {
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86 }
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87 };
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88
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89
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90 class WriterLock : public boost::noncopyable
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91 {
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92 private:
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93 LockingEmitter& that_;
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94 boost::unique_lock<boost::shared_mutex> lock_;
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95
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96 public:
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97 WriterLock(LockingEmitter& that) :
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98 that_(that),
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99 lock_(that.mutex_)
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100 {
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101 }
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102
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103 MessageBroker& GetBroker()
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104 {
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105 return that_.broker_;
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106 }
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107
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108 IObservable& GetOracleObservable()
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109 {
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110 return that_.oracleObservable_;
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111 }
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112 };
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113 };
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114 }