third_party/WebKit/Source/core/dom/ActiveDOMObject.cpp

   1 /*
   2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  */
  26
  27 #include "config.h"
  28 #include "core/dom/ActiveDOMObject.h"
  29
  30 #include "core/dom/ExecutionContext.h"
  31 #include "core/inspector/InstanceCounters.h"
  32
  33 namespace blink {
  34
  35 ActiveDOMObject::ActiveDOMObject(ExecutionContext* executionContext)
  36     : ContextLifecycleObserver(executionContext, ActiveDOMObjectType)
  37 #if ENABLE(ASSERT)
  38     , m_suspendIfNeededCalled(false)
  39 #endif
  40 {
  41     ASSERT(!executionContext || executionContext->isContextThread());
  42     // TODO(hajimehoshi): Now the leak detector can't treat vaious threads other
  43     // than the main thread and worker threads. After fixing the leak detector,
  44     // let's count objects on other threads as many as possible.
  45     if (isMainThread())
  46         InstanceCounters::incrementCounter(InstanceCounters::ActiveDOMObjectCounter);
  47 }
  48
  49 ActiveDOMObject::~ActiveDOMObject()
  50 {
  51     if (isMainThread())
  52         InstanceCounters::decrementCounter(InstanceCounters::ActiveDOMObjectCounter);
  53
  54     ASSERT(m_suspendIfNeededCalled);
  55
  56     // Oilpan: not valid to access executionContext() in the destructor.
  57 #if !ENABLE(OILPAN)
  58     ASSERT(!executionContext() || executionContext()->isContextThread());
  59 #endif
  60 }
  61
  62 void ActiveDOMObject::suspendIfNeeded()
  63 {
  64 #if ENABLE(ASSERT)
  65     ASSERT(!m_suspendIfNeededCalled);
  66     m_suspendIfNeededCalled = true;
  67 #endif
  68     if (ExecutionContext* context = executionContext())
  69         context->suspendActiveDOMObjectIfNeeded(this);
  70 }
  71
  72 bool ActiveDOMObject::hasPendingActivity() const
  73 {
  74     return false;
  75 }
  76
  77 void ActiveDOMObject::suspend()
  78 {
  79 }
  80
  81 void ActiveDOMObject::resume()
  82 {
  83 }
  84
  85 void ActiveDOMObject::stop()
  86 {
  87 }
  88
  89 void ActiveDOMObject::didMoveToNewExecutionContext(ExecutionContext* context)
  90 {
  91     setContext(context);
  92
  93     if (context->activeDOMObjectsAreStopped()) {
  94         stop();
  95         return;
  96     }
  97
  98     if (context->activeDOMObjectsAreSuspended()) {
  99         suspend();
 100         return;
 101     }
 102
 103     resume();
 104 }
 105
 106 } // namespace blink