Move parseFontFaceDescriptor to CSSPropertyParser.cpp
[chromium-blink-merge.git] / third_party / WebKit / Source / platform / LifecycleNotifier.h
blobc22dea35b25ade4b8aa6a867f3aa237c7f6addd7
1 /*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 * Copyright (C) 2013 Google Inc. All Rights Reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #ifndef LifecycleNotifier_h
28 #define LifecycleNotifier_h
30 #include "platform/heap/Handle.h"
31 #include "wtf/HashSet.h"
32 #include "wtf/TemporaryChange.h"
34 namespace blink {
36 template<typename T, typename Observer>
37 class LifecycleNotifier : public virtual WillBeGarbageCollectedMixin {
38 public:
39 virtual ~LifecycleNotifier();
41 void addObserver(Observer*);
42 void removeObserver(Observer*);
44 // notifyContextDestroyed() should be explicitly dispatched from an
45 // observed context to notify observers that contextDestroyed().
47 // When contextDestroyed() is called, the observer's lifecycleContext()
48 // is still valid and safe to use during the notification.
49 virtual void notifyContextDestroyed();
51 DEFINE_INLINE_VIRTUAL_TRACE()
53 #if ENABLE(OILPAN)
54 visitor->trace(m_observers);
55 #endif
58 bool isIteratingOverObservers() const { return m_iterating != IteratingNone; }
60 protected:
61 LifecycleNotifier()
62 : m_iterating(IteratingNone)
63 , m_didCallContextDestroyed(false)
67 enum IterationType {
68 IteratingNone,
69 IteratingOverAll,
72 IterationType m_iterating;
74 protected:
75 using ObserverSet = WillBeHeapHashSet<RawPtrWillBeWeakMember<Observer>>;
77 ObserverSet m_observers;
79 #if ENABLE(ASSERT)
80 T* context() { return static_cast<T*>(this); }
81 #endif
83 private:
84 bool m_didCallContextDestroyed;
87 template<typename T, typename Observer>
88 inline LifecycleNotifier<T, Observer>::~LifecycleNotifier()
90 // FIXME: Enable the following ASSERT. Also see a FIXME in Document::detach().
91 // ASSERT(!m_observers.size() || m_didCallContextDestroyed);
93 #if !ENABLE(OILPAN)
94 TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
95 for (Observer* observer : m_observers) {
96 ASSERT(observer->lifecycleContext() == context());
97 observer->clearLifecycleContext();
99 #endif
102 template<typename T, typename Observer>
103 inline void LifecycleNotifier<T, Observer>::notifyContextDestroyed()
105 // Don't notify contextDestroyed() twice.
106 if (m_didCallContextDestroyed)
107 return;
109 TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
110 Vector<Observer*> snapshotOfObservers;
111 copyToVector(m_observers, snapshotOfObservers);
112 for (Observer* observer : snapshotOfObservers) {
113 // FIXME: Oilpan: At the moment, it's possible that the Observer is
114 // destructed during the iteration. Once we enable Oilpan by default
115 // for Observers, we can remove the hack by making m_observers
116 // a HeapHashSet<WeakMember<Observers>>. (i.e., we can just iterate
117 // m_observers without taking a snapshot).
118 if (m_observers.contains(observer)) {
119 ASSERT(observer->lifecycleContext() == context());
120 observer->contextDestroyed();
123 m_didCallContextDestroyed = true;
126 template<typename T, typename Observer>
127 inline void LifecycleNotifier<T, Observer>::addObserver(Observer* observer)
129 RELEASE_ASSERT(m_iterating != IteratingOverAll);
130 m_observers.add(observer);
133 template<typename T, typename Observer>
134 inline void LifecycleNotifier<T, Observer>::removeObserver(Observer* observer)
136 m_observers.remove(observer);
139 } // namespace blink
141 #endif // LifecycleNotifier_h