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#include "config.h"
27#include "NetworkStateNotifier.h"
28
29#if PLATFORM(IOS)
30#include "Settings.h"
31#endif
32
33#include <mutex>
34#include <wtf/Assertions.h>
35#include <wtf/NeverDestroyed.h>
36
37namespace WebCore {
38
39NetworkStateNotifier& networkStateNotifier()
40{
41    static std::once_flag onceFlag;
42    static LazyNeverDestroyed<NetworkStateNotifier> networkStateNotifier;
43
44    std::call_once(onceFlag, []{
45        networkStateNotifier.construct();
46    });
47
48    return networkStateNotifier;
49}
50
51void NetworkStateNotifier::addNetworkStateChangeListener(std::function<void (bool)> listener)
52{
53    ASSERT(listener);
54#if PLATFORM(IOS)
55    if (Settings::shouldOptOutOfNetworkStateObservation())
56        return;
57    registerObserverIfNecessary();
58#endif
59
60    m_listeners.append(WTF::move(listener));
61}
62
63void NetworkStateNotifier::notifyNetworkStateChange() const
64{
65    for (const auto& listener : m_listeners)
66        listener(m_isOnLine);
67}
68
69} // namespace WebCore
70