annotate Framework/Messages/Promise.h @ 381:19bd222283ae

uncoupling LayerReadyMessage from the creation of the renderer
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 06 Nov 2018 15:36:06 +0100
parents 4a79193ffb58
children 99e31898910e
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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) 2017-2018 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 "MessageBroker.h"
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25 #include "ICallable.h"
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26 #include "IMessage.h"
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27
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28 #include <boost/noncopyable.hpp>
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29 #include <memory>
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30
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31 namespace OrthancStone {
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32
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33 class Promise : public boost::noncopyable
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34 {
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35 protected:
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36 MessageBroker& broker_;
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37
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38 std::auto_ptr<ICallable> successCallable_;
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39 std::auto_ptr<ICallable> failureCallable_;
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40
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41 public:
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42 Promise(MessageBroker& broker)
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43 : broker_(broker)
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44 {
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45 }
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46
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47 void Success(const IMessage& message)
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48 {
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49 // check the target is still alive in the broker
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50 if (broker_.IsActive(successCallable_->GetObserver()))
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51 {
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52 successCallable_->Apply(message);
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53 }
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54 }
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55
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56 void Failure(const IMessage& message)
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57 {
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58 // check the target is still alive in the broker
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59 if (broker_.IsActive(failureCallable_->GetObserver()))
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60 {
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61 failureCallable_->Apply(message);
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62 }
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63 }
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64
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65 Promise& Then(ICallable* successCallable)
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66 {
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67 if (successCallable_.get() != NULL)
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68 {
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69 // TODO: throw throw new "Promise may only have a single success target"
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70 }
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71 successCallable_.reset(successCallable);
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72 return *this;
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73 }
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74
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75 Promise& Else(ICallable* failureCallable)
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76 {
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77 if (failureCallable_.get() != NULL)
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78 {
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79 // TODO: throw throw new "Promise may only have a single failure target"
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80 }
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81 failureCallable_.reset(failureCallable);
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82 return *this;
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83 }
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84
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85 };
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88 }