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