/* * Copyright (C) 2008-2017 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "NetworkStateNotifier.h" #include <wtf/NeverDestroyed.h> namespace WebCore { static const Seconds updateStateSoonInterval { 2_s }; NetworkStateNotifier& NetworkStateNotifier::singleton() { RELEASE_ASSERT(isMainThread()); static NeverDestroyed<NetworkStateNotifier> networkStateNotifier; return networkStateNotifier; } NetworkStateNotifier::NetworkStateNotifier() : m_updateStateTimer([] { singleton().updateState(); }) { } bool NetworkStateNotifier::onLine() { if (!m_isOnLine) updateState(); return m_isOnLine.value_or(true); } void NetworkStateNotifier::addListener(WTF::Function<void(bool)>&& listener) { ASSERT(listener); if (m_listeners.isEmpty()) startObserving(); m_listeners.append(WTFMove(listener)); } void NetworkStateNotifier::updateState() { auto wasOnLine = m_isOnLine; updateStateWithoutNotifying(); if (m_isOnLine == wasOnLine) return; for (auto& listener : m_listeners) listener(m_isOnLine.value()); } void NetworkStateNotifier::updateStateSoon() { m_updateStateTimer.startOneShot(updateStateSoonInterval); } } // namespace WebCore