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comparison Framework/Messages/MessageBroker.h @ 250:5e642859267e am-2

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added new Observable/Observer & MessageBroker (not used yet)
author am@osimis.io
date Mon, 02 Jul 2018 16:36:17 +0200
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children 192e6e349e69
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249:54c7284b0eff 250:5e642859267e
1 /**
2 * Stone of Orthanc
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2018 Osimis S.A., Belgium
6 *
7 * This program is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU Affero General Public License
9 * as published by the Free Software Foundation, either version 3 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Affero General Public License for more details.
16 *
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 **/
20
21
22 #pragma once
23
24 #include "../StoneEnumerations.h"
25
26 #include "boost/noncopyable.hpp"
27 #include <map>
28 #include <list>
29 #include <set>
30 namespace OrthancStone
31 {
32 class IObserver;
33 class IObservable;
34 class IMessage;
35
36 /*
37 * This is a central message broker. It keeps track of all observers and knows
38 * when an observer is deleted.
39 * This way, it can prevent an observable to send a message to a dead observer.
40 */
41 class MessageBroker : public boost::noncopyable
42 {
43
44 std::set<IObserver*> activeObservers_; // the list of observers that are currently alive (that have not been deleted)
45
46 public:
47
48 void Register(IObserver& observer)
49 {
50 activeObservers_.insert(&observer);
51 }
52
53 void Unregister(IObserver& observer)
54 {
55 activeObservers_.erase(&observer);
56 }
57
58 void Emit(IObservable& from, std::set<IObserver*> observers, const IMessage& message);
59 };
60
61 }