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annotate Framework/Messages/MessageForwarder.h @ 923:6b81c5453382

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RadiographyScene: avoid exporting to width+1 image size due to numerical noise in GetSceneExtent()
author Alain Mazy <alain@mazy.be>
date Mon, 22 Jul 2019 14:28:56 +0200
parents a750f11892ec
children e146743f6cdc 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
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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 "ICallable.h"
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25 #include "IObserver.h"
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26
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27 #include <boost/noncopyable.hpp>
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28
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29 namespace OrthancStone
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30 {
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31
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32 class IObservable;
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33
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34 class IMessageForwarder : public IObserver
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35 {
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36 IObservable& emitter_;
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37 public:
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38 IMessageForwarder(MessageBroker& broker, IObservable& emitter)
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39 : IObserver(broker),
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40 emitter_(emitter)
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41 {}
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42 virtual ~IMessageForwarder() {}
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43
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44 protected:
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45 void ForwardMessageInternal(const IMessage& message);
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46 void RegisterForwarderInEmitter();
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47
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48 };
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49
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50 /* When an Observer (B) simply needs to re-emit a message it has received, instead of implementing
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51 * a specific member function to forward the message, it can create a MessageForwarder.
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52 * The MessageForwarder will re-emit the message "in the name of (B)"
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53 *
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54 * Consider the chain where
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55 * A is an observable
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56 * |
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57 * B is an observer of A and observable
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58 * |
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59 * C is an observer of B and knows that B is re-emitting many messages from A
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60 *
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61 * instead of implementing a callback, B will create a MessageForwarder that will emit the messages in his name:
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62 * A.RegisterObserverCallback(new MessageForwarder<A::MessageType>(broker, *this) // where "this" is B
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63 *
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64 * in C:
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65 * B.RegisterObserverCallback(new Callable<C, A:MessageTyper>(*this, &B::MyCallback)) // where "this" is C
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66 */
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67 template<typename TMessage>
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68 class MessageForwarder : public IMessageForwarder, public Callable<MessageForwarder<TMessage>, TMessage>
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69 {
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70 public:
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71 MessageForwarder(MessageBroker& broker,
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72 IObservable& emitter // the object that will emit the messages to forward
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73 )
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74 : IMessageForwarder(broker, emitter),
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75 Callable<MessageForwarder<TMessage>, TMessage>(*this, &MessageForwarder::ForwardMessage)
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76 {
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77 RegisterForwarderInEmitter();
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78 }
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80 protected:
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81 void ForwardMessage(const TMessage& message)
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82 {
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83 ForwardMessageInternal(message);
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84 }
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85
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86 };
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87 }