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

Source/core/page/PageLifecycleNotifier.h

+
 /*
- * Copyright (C) 2008, 2010 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 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 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. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef PurgeableBuffer_h
-#define PurgeableBuffer_h
+#ifndef PageLifecycleNotifier_h
+#define PageLifecycleNotifier_h
 
-#include "wtf/OwnPtr.h"
+#include "core/dom/SimpleLifecycleNotifier.h"
+#include "core/page/PageLifecycleObserver.h"
 #include "wtf/PassOwnPtr.h"
-
-namespace WebKit {
-class WebDiscardableMemory;
-}
+#include "wtf/TemporaryChange.h"
 
 namespace WebCore {
 
-class PurgeableBuffer {
-    WTF_MAKE_NONCOPYABLE(PurgeableBuffer);
+class Page;
+
+class PageLifecycleNotifier : public SimpleLifecycleNotifier {
 public:
-    static PassOwnPtr<PurgeableBuffer> create(const char* data, size_t);
-    ~PurgeableBuffer();
+    static PassOwnPtr<PageLifecycleNotifier> create(SimpleLifecycleContext*);
 
-    // Call lock and check the return value before accessing the data.
-    const char* data() const;
-    size_t size() const { return m_size; }
+    void notifyPageVisibilityChanged();
 
-    bool isPurgeable() const { return m_state != Locked; }
-    bool wasPurged() const;
-
-    bool lock();
-    void unlock();
+    virtual void addObserver(SimpleLifecycleObserver*, SimpleLifecycleObserver::Type) OVERRIDE;
+    virtual void removeObserver(SimpleLifecycleObserver*, SimpleLifecycleObserver::Type) OVERRIDE;
 
 private:
-    enum State {
-        Locked,
-        Unlocked,
-        Purged
-    };
+    explicit PageLifecycleNotifier(SimpleLifecycleContext*);
 
-    PurgeableBuffer(PassOwnPtr<WebKit::WebDiscardableMemory>, const char* data, size_t);
-
-    OwnPtr<WebKit::WebDiscardableMemory> m_memory;
-    size_t m_size;
-    State m_state;
+    typedef HashSet<PageLifecycleObserver*> PageObserverSet;
+    PageObserverSet m_pageObservers;
 };
 
+inline PassOwnPtr<PageLifecycleNotifier> PageLifecycleNotifier::create(SimpleLifecycleContext* context)
+{
+    return adoptPtr(new PageLifecycleNotifier(context));
 }
 
-#endif
+inline void PageLifecycleNotifier::notifyPageVisibilityChanged()
+{
+    TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverPageObservers);
+    for (PageObserverSet::iterator it = m_pageObservers.begin(); it != m_pageObservers.end(); ++it)
+        (*it)->pageVisibilityChanged();
+}
+
+} // namespace WebCore
+
+#endif // PageLifecycleNotifier_h