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 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 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 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