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

Source/core/dom/LifecycleNotifier.cpp

+/*
+ * Copyright (C) 2008 Apple Inc. All Rights Reserved.
+ * 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.
+ *
+ */
+
+#include "config.h"
+#include "core/dom/LifecycleNotifier.h"
+
+namespace WebCore {
+
+LifecycleNotifier::LifecycleNotifier(LifecycleContext* context)
+    : m_context(context)
+    , m_inDestructor(false)
+    , m_iterating(IteratingNone)
+{
+}
+
+LifecycleNotifier::~LifecycleNotifier()
+{
+    m_inDestructor = true;
+    for (SimpleObserverSet::iterator it = m_observers.begin(); it != m_observers.end(); it = m_observers.begin()) {
+        LifecycleObserver* observer = *it;
+        m_observers.remove(observer);
+        ASSERT(observer->lifecycleContext() == m_context);
+        observer->contextDestroyed();
+    }
+}
+
+void LifecycleNotifier::addObserver(LifecycleObserver* observer, LifecycleObserver::Type type)
+{
+    RELEASE_ASSERT(!m_inDestructor);
+    m_observers.add(observer);
+}
+
+void LifecycleNotifier::removeObserver(LifecycleObserver* observer, LifecycleObserver::Type type)
+{
+    RELEASE_ASSERT(!m_inDestructor);
+    m_observers.remove(observer);
+}
+
+LifecycleContext* LifecycleNotifier::context()
+{
+    return m_context;
+}
+
+} // namespace WebCore