third_party/WebKit/Source/core/dom/ContextLifecycleNotifier.h

   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
  28 #ifndef ContextLifecycleNotifier_h
  29 #define ContextLifecycleNotifier_h
  30
  31 #include "core/CoreExport.h"
  32 #include "platform/LifecycleNotifier.h"
  33 #include "wtf/Noncopyable.h"
  34
  35 namespace blink {
  36
  37 class ActiveDOMObject;
  38 class ContextLifecycleObserver;
  39 class ExecutionContext;
  40
  41 class CORE_EXPORT ContextLifecycleNotifier : public LifecycleNotifier<ExecutionContext, ContextLifecycleObserver> {
  42     WTF_MAKE_NONCOPYABLE(ContextLifecycleNotifier);
  43 public:
  44     void notifyResumingActiveDOMObjects();
  45     void notifySuspendingActiveDOMObjects();
  46     void notifyStoppingActiveDOMObjects();
  47
  48     unsigned activeDOMObjectCount() const;
  49     bool hasPendingActivity() const;
  50
  51 protected:
  52     // Need a default constructor to link core and modules separately.
  53     // If no default constructor, we will see an error: "constructor for
  54     // 'blink::ExecutionContext' must explicitly initialize the base class
  55     // 'blink::ContextLifecycleNotifier' which does not have a default
  56     // constructor ExecutionContext::ExecutionContext()".
  57     ContextLifecycleNotifier() { }
  58
  59 #if ENABLE(ASSERT)
  60     bool contains(ActiveDOMObject*) const;
  61 #endif
  62 };
  63
  64 } // namespace blink
  65
  66 #endif // ContextLifecycleNotifier_h