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 "ActiveDOMObject.h" 29 30#include "ScriptExecutionContext.h" 31#include "WorkerContext.h" 32#include "WorkerThread.h" 33 34namespace WebCore { 35 36ActiveDOMObject::ActiveDOMObject(ScriptExecutionContext* scriptExecutionContext) 37 : ContextDestructionObserver(scriptExecutionContext) 38 , m_pendingActivityCount(0) 39#if !ASSERT_DISABLED 40 , m_suspendIfNeededCalled(false) 41#endif 42{ 43 if (!m_scriptExecutionContext) 44 return; 45 46 ASSERT(m_scriptExecutionContext->isContextThread()); 47 m_scriptExecutionContext->didCreateActiveDOMObject(this); 48} 49 50ActiveDOMObject::~ActiveDOMObject() 51{ 52 if (!m_scriptExecutionContext) 53 return; 54 55 ASSERT(m_suspendIfNeededCalled); 56 57 // ActiveDOMObject may be inherited by a sub-class whose life-cycle 58 // exceeds that of the associated ScriptExecutionContext. In those cases, 59 // m_scriptExecutionContext would/should have been nullified by 60 // ContextDestructionObserver::contextDestroyed() (which we implement / 61 // inherit). Hence, we should ensure that this is not 0 before use it 62 // here. 63 if (m_scriptExecutionContext) { 64 ASSERT(m_scriptExecutionContext->isContextThread()); 65 m_scriptExecutionContext->willDestroyActiveDOMObject(this); 66 } 67} 68 69void ActiveDOMObject::suspendIfNeeded() 70{ 71#if !ASSERT_DISABLED 72 ASSERT(!m_suspendIfNeededCalled); 73 m_suspendIfNeededCalled = true; 74#endif 75 if (!m_scriptExecutionContext) 76 return; 77 78 m_scriptExecutionContext->suspendActiveDOMObjectIfNeeded(this); 79} 80 81bool ActiveDOMObject::hasPendingActivity() const 82{ 83 return m_pendingActivityCount; 84} 85 86bool ActiveDOMObject::canSuspend() const 87{ 88 return false; 89} 90 91void ActiveDOMObject::suspend(ReasonForSuspension) 92{ 93} 94 95void ActiveDOMObject::resume() 96{ 97} 98 99void ActiveDOMObject::stop() 100{ 101} 102 103} // namespace WebCore 104