1/*
2 * Copyright (C) 2012 Google Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include <memory>
29#include <wtf/Forward.h>
30#include <wtf/HashMap.h>
31#include <wtf/HashSet.h>
32#include <wtf/text/AtomicString.h>
33
34namespace WebCore {
35
36class IdTargetObserver;
37
38class IdTargetObserverRegistry {
39 WTF_MAKE_FAST_ALLOCATED;
40 friend class IdTargetObserver;
41public:
42 IdTargetObserverRegistry() { }
43
44 void notifyObservers(const AtomicString& id);
45 void notifyObservers(const AtomicStringImpl& id);
46
47private:
48 void addObserver(const AtomicString& id, IdTargetObserver*);
49 void removeObserver(const AtomicString& id, IdTargetObserver*);
50 void notifyObserversInternal(const AtomicStringImpl& id);
51
52 typedef HashSet<IdTargetObserver*> ObserverSet;
53 typedef HashMap<const AtomicStringImpl*, std::unique_ptr<ObserverSet>> IdToObserverSetMap;
54 IdToObserverSetMap m_registry;
55 ObserverSet* m_notifyingObserversInSet { nullptr };
56};
57
58inline void IdTargetObserverRegistry::notifyObservers(const AtomicString& id)
59{
60 if (!id.isEmpty())
61 return notifyObservers(*id.impl());
62}
63
64inline void IdTargetObserverRegistry::notifyObservers(const AtomicStringImpl& id)
65{
66 ASSERT(!m_notifyingObserversInSet);
67 ASSERT(id.length());
68 if (m_registry.isEmpty())
69 return;
70 IdTargetObserverRegistry::notifyObserversInternal(id);
71}
72
73} // namespace WebCore
74