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

Source/core/dom/SimpleLifecycleNotifier.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/ContextLifecycleObserver.h"
-
-#include "core/dom/ScriptExecutionContext.h"
+#include "core/dom/SimpleLifecycleNotifier.h"
 
 namespace WebCore {
 
-ContextLifecycleObserver::ContextLifecycleObserver(ScriptExecutionContext* scriptExecutionContext, Type type)
-    : m_scriptExecutionContext(0)
+SimpleLifecycleNotifier::SimpleLifecycleNotifier(SimpleLifecycleContext* context)
+    : m_context(context)
+    , m_inDestructor(false)
+    , m_iterating(IteratingNone)
 {
-    observeContext(scriptExecutionContext, type);
 }
 
-ContextLifecycleObserver::~ContextLifecycleObserver()
+SimpleLifecycleNotifier::~SimpleLifecycleNotifier()
 {
-    if (m_scriptExecutionContext)
-        observeContext(0, GenericType);
-}
-
-void ContextLifecycleObserver::observeContext(ScriptExecutionContext* scriptExecutionContext, Type as)
-{
-    if (m_scriptExecutionContext) {
-        ASSERT(m_scriptExecutionContext->isContextThread());
-        m_scriptExecutionContext->wasUnobservedBy(this, as);
-    }
-
-    m_scriptExecutionContext = scriptExecutionContext;
-
-    if (m_scriptExecutionContext) {
-        ASSERT(m_scriptExecutionContext->isContextThread());
-        m_scriptExecutionContext->wasObservedBy(this, as);
+    m_inDestructor = true;
+    for (SimpleObserverSet::iterator it = m_observers.begin(); it != m_observers.end(); it = m_observers.begin()) {
+        SimpleLifecycleObserver* observer = *it;
+        m_observers.remove(observer);
+        ASSERT(observer->simpleLifecycleContext() == m_context);
+        observer->contextDestroyed();
     }
 }
 
-void ContextLifecycleObserver::contextDestroyed()
+void SimpleLifecycleNotifier::addObserver(SimpleLifecycleObserver* observer, SimpleLifecycleObserver::Type type)
 {
-    m_scriptExecutionContext = 0;
+    RELEASE_ASSERT(!m_inDestructor);
+    m_observers.add(observer);
+}
+
+void SimpleLifecycleNotifier::removeObserver(SimpleLifecycleObserver* observer, SimpleLifecycleObserver::Type type)
+{
+    RELEASE_ASSERT(!m_inDestructor);
+    m_observers.remove(observer);
+}
+
+SimpleLifecycleContext* SimpleLifecycleNotifier::context()
+{
+    return m_context;
 }
 
 } // namespace WebCore