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 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 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 "ContextDestructionObserver.h" 29 30#include "ScriptExecutionContext.h" 31 32namespace WebCore { 33 34ContextDestructionObserver::ContextDestructionObserver(ScriptExecutionContext* scriptExecutionContext) 35 : m_scriptExecutionContext(nullptr) 36{ 37 observeContext(scriptExecutionContext); 38} 39 40ContextDestructionObserver::~ContextDestructionObserver() 41{ 42 observeContext(nullptr); 43} 44 45void ContextDestructionObserver::observeContext(ScriptExecutionContext* scriptExecutionContext) 46{ 47 if (m_scriptExecutionContext) { 48 ASSERT(m_scriptExecutionContext->isContextThread()); 49 m_scriptExecutionContext->willDestroyDestructionObserver(*this); 50 } 51 52 m_scriptExecutionContext = scriptExecutionContext; 53 54 if (m_scriptExecutionContext) { 55 ASSERT(m_scriptExecutionContext->isContextThread()); 56 m_scriptExecutionContext->didCreateDestructionObserver(*this); 57 } 58} 59 60void ContextDestructionObserver::contextDestroyed() 61{ 62 m_scriptExecutionContext = nullptr; 63} 64 65} // namespace WebCore 66