| /* |
| * 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> |
| |
| #if USE(WEB_THREAD) |
| #include "WebCoreThread.h" |
| #endif |
| |
| namespace WebCore { |
| |
| static const Seconds updateStateSoonInterval { 2_s }; |
| |
| static bool shouldSuppressThreadSafetyCheck() |
| { |
| #if USE(WEB_THREAD) |
| return WebThreadIsEnabled(); |
| #else |
| return false; |
| #endif |
| } |
| |
| NetworkStateNotifier& NetworkStateNotifier::singleton() |
| { |
| RELEASE_ASSERT(shouldSuppressThreadSafetyCheck() || isMainThread()); |
| static NeverDestroyed<NetworkStateNotifier> networkStateNotifier; |
| return networkStateNotifier; |
| } |
| |
| NetworkStateNotifier::NetworkStateNotifier() |
| : m_updateStateTimer([] { |
| singleton().updateState(); |
| }) |
| { |
| } |
| |
| bool NetworkStateNotifier::onLine() |
| { |
| if (!m_isOnLine) |
| updateState(); |
| return m_isOnLine.valueOr(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 |