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annotate Framework/Messages/Promise.h @ 299:3897f9f28cfa am-callable-and-promise

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backup work in progress: updated messaging framework with ICallable
author am@osimis.io
date Fri, 14 Sep 2018 16:44:01 +0200
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children 4a79193ffb58
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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
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30 namespace OrthancStone {
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31
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32 class Promise : public boost::noncopyable
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33 {
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34 protected:
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35 MessageBroker& broker_;
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36
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37 ICallable* successCallable_;
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38 ICallable* failureCallable_;
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39
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40 public:
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41 Promise(MessageBroker& broker)
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42 : broker_(broker),
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43 successCallable_(NULL),
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44 failureCallable_(NULL)
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45 {
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46 }
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47
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48 void Success(const IMessage& message)
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49 {
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50 // check the target is still alive in the broker
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51 if (broker_.IsActive(successCallable_->GetObserver()))
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52 {
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53 successCallable_->Apply(message);
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54 }
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55 }
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56
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57 void Failure(const IMessage& message)
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58 {
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59 // check the target is still alive in the broker
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60 if (broker_.IsActive(failureCallable_->GetObserver()))
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61 {
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62 failureCallable_->Apply(message);
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63 }
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64 }
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65
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66 Promise& Then(ICallable* successCallable)
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67 {
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68 if (successCallable_ != NULL)
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69 {
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70 // TODO: throw throw new "Promise may only have a single success target"
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71 }
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72 successCallable_ = successCallable;
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73 return *this;
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74 }
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75
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76 Promise& Else(ICallable* failureCallable)
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77 {
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78 if (failureCallable_ != NULL)
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79 {
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80 // TODO: throw throw new "Promise may only have a single failure target"
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81 }
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82 failureCallable_ = failureCallable;
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83 return *this;
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84 }
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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 }