/* * Copyright (C) 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. AND ITS CONTRIBUTORS ``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 ITS 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 "AbortSignal.h" #include "Event.h" #include "EventNames.h" #include "ScriptExecutionContext.h" #include <wtf/IsoMallocInlines.h> namespace WebCore { WTF_MAKE_ISO_ALLOCATED_IMPL(AbortSignal); Ref<AbortSignal> AbortSignal::create(ScriptExecutionContext& context) { return adoptRef(*new AbortSignal(context)); } AbortSignal::AbortSignal(ScriptExecutionContext& context) : ContextDestructionObserver(&context) { } // https://dom.spec.whatwg.org/#abortsignal-signal-abort void AbortSignal::abort() { // 1. If signal's aborted flag is set, then return. if (m_aborted) return; // 2. Set signal’s aborted flag. m_aborted = true; auto protectedThis = makeRef(*this); auto algorithms = WTFMove(m_algorithms); for (auto& algorithm : algorithms) algorithm(); // 5. Fire an event named abort at signal. dispatchEvent(Event::create(eventNames().abortEvent, Event::CanBubble::No, Event::IsCancelable::No)); } // https://dom.spec.whatwg.org/#abortsignal-follow void AbortSignal::follow(AbortSignal& signal) { if (aborted()) return; if (signal.aborted()) { abort(); return; } ASSERT(!m_followingSignal); m_followingSignal = makeWeakPtr(signal); signal.addAlgorithm([weakThis = makeWeakPtr(this)] { if (!weakThis) return; weakThis->abort(); }); } }