1 /*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 * Copyright (C) 2013 Google Inc. All Rights Reserved.
4 *
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.
13 *
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.
25 *
26 */
27 #ifndef ContextLifecycleNotifier_h
28 #define ContextLifecycleNotifier_h
29
30 #include "core/dom/ActiveDOMObject.h"
31 #include "platform/LifecycleNotifier.h"
32 #include "wtf/HashSet.h"
33 #include "wtf/PassOwnPtr.h"
34
35 namespace WebCore {
36
37 class ActiveDOMObject;
38 class ContextLifecycleObserver;
39 class ExecutionContext;
40
41 class ContextLifecycleNotifier : public LifecycleNotifier<ExecutionContext> {
42 public:
43 static PassOwnPtr<ContextLifecycleNotifier> create(ExecutionContext*);
44
45 virtual ~ContextLifecycleNotifier();
46
47 typedef HashSet<ActiveDOMObject*> ActiveDOMObjectSet;
48
activeDOMObjects()49 const ActiveDOMObjectSet& activeDOMObjects() const { return m_activeDOMObjects; }
50
51 virtual void addObserver(Observer*) OVERRIDE;
52 virtual void removeObserver(Observer*) OVERRIDE;
53
54 void notifyResumingActiveDOMObjects();
55 void notifySuspendingActiveDOMObjects();
56 void notifyStoppingActiveDOMObjects();
57
contains(ActiveDOMObject * object)58 bool contains(ActiveDOMObject* object) const { return m_activeDOMObjects.contains(object); }
59 bool hasPendingActivity() const;
60
61 protected:
62 explicit ContextLifecycleNotifier(ExecutionContext*);
63
64 private:
65 ActiveDOMObjectSet m_activeDOMObjects;
66 };
67
create(ExecutionContext * context)68 inline PassOwnPtr<ContextLifecycleNotifier> ContextLifecycleNotifier::create(ExecutionContext* context)
69 {
70 return adoptPtr(new ContextLifecycleNotifier(context));
71 }
72
73 } // namespace WebCore
74
75 #endif // ContextLifecycleNotifier_h
76