Extract simpler classes for observing context lifecycle and observe Page lifecycle inNavigatorVibra…

Source/core/dom/LifecycleContext.h

+
+/*
+ * Copyright (C) 2013 Google Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef LifecycleContext_h
+#define LifecycleContext_h
+
+#include "core/dom/LifecycleObserver.h"
+#include "wtf/HashSet.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
+
+namespace WebCore {
+
+class LifecycleNotifier;
+class LifecycleObserver;
+
+class LifecycleContext {
+public:
+    LifecycleContext();
+    virtual ~LifecycleContext();
+
+    virtual bool isContextThread() const { return true; }
+
+    // Called from the constructor of observers.
+    void wasObservedBy(LifecycleObserver*, LifecycleObserver::Type);
+
+    // Called from the destructor of observers.
+    void wasUnobservedBy(LifecycleObserver*, LifecycleObserver::Type);
+
+protected:
+    LifecycleNotifier* lifecycleNotifier();
+
+private:
+    virtual PassOwnPtr<LifecycleNotifier> createLifecycleNotifier();
+
+    OwnPtr<LifecycleNotifier> m_lifecycleNotifier;
+};
+
+} // namespace WebCore
+
+#endif // LifecycleContext_h