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annotate Framework/Messages/ICallable.h @ 872:733c6db3e5a3 am-dev

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author Alain Mazy <alain@mazy.be>
date Mon, 01 Jul 2019 13:36:51 +0200
parents f0008c55e5f7
children 38409549db43
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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
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22 #pragma once
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23
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24 #include "IMessage.h"
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25
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26 #include <boost/noncopyable.hpp>
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27
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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 // This is referencing an object and member function that can be notified
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33 // by an IObservable. The object must derive from IO
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34 // The member functions must be of type "void Function(const IMessage& message)" or reference a derived class of IMessage
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35 class ICallable : public boost::noncopyable
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36 {
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37 public:
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38 virtual ~ICallable()
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39 {
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40 }
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41
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42 virtual void Apply(const IMessage& message) = 0;
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43
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44 virtual const MessageIdentifier& GetMessageIdentifier() = 0;
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45
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46 virtual IObserver* GetObserver() const = 0;
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47 };
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48
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49 template <typename TMessage>
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50 class MessageHandler: public ICallable
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51 {
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52 };
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53
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54
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55 template <typename TObserver,
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56 typename TMessage>
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57 class Callable : public MessageHandler<TMessage>
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58 {
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59 private:
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60 typedef void (TObserver::* MemberFunction) (const TMessage&);
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61
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62 TObserver& observer_;
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63 MemberFunction function_;
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64
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65 public:
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66 Callable(TObserver& observer,
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67 MemberFunction function) :
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68 observer_(observer),
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69 function_(function)
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70 {
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71 }
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72
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73 void ApplyInternal(const TMessage& message)
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74 {
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75 (observer_.*function_) (message);
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76 }
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77
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78 virtual void Apply(const IMessage& message)
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79 {
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80 ApplyInternal(dynamic_cast<const TMessage&>(message));
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81 }
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82
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83 virtual const MessageIdentifier& GetMessageIdentifier()
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84 {
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85 return TMessage::GetStaticIdentifier();
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86 }
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87
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88 virtual IObserver* GetObserver() const
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89 {
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90 return &observer_;
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91 }
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92 };
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93
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94 #if 0 /* __cplusplus >= 201103L*/
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95
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96 #include <functional>
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97
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98 template <typename TMessage>
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99 class LambdaCallable : public MessageHandler<TMessage>
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100 {
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101 private:
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102
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103 IObserver& observer_;
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104 std::function<void (const TMessage&)> lambda_;
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105
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106 public:
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107 LambdaCallable(IObserver& observer,
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108 std::function<void (const TMessage&)> lambdaFunction) :
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109 observer_(observer),
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110 lambda_(lambdaFunction)
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111 {
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112 }
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113
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114 virtual void Apply(const IMessage& message)
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115 {
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116 lambda_(dynamic_cast<const TMessage&>(message));
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117 }
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118
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119 virtual IObserver* GetObserver() const
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120 {
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121 return &observer_;
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122 }
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123 };
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124 #endif //__cplusplus >= 201103L
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125 }