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/*
* 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 "AbortAlgorithm.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));
}
// https://dom.spec.whatwg.org/#dom-abortsignal-abort
Ref<AbortSignal> AbortSignal::abort(ScriptExecutionContext& context)
{
return adoptRef(*new AbortSignal(context, Aborted::Yes));
}
AbortSignal::AbortSignal(ScriptExecutionContext& context, Aborted aborted)
: ContextDestructionObserver(&context)
, m_aborted(aborted == Aborted::Yes)
{
}
// https://dom.spec.whatwg.org/#abortsignal-signal-abort
void AbortSignal::signalAbort()
{
// 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 = std::exchange(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::signalFollow(AbortSignal& signal)
{
if (aborted())
return;
if (signal.aborted()) {
signalAbort();
return;
}
ASSERT(!m_followingSignal);
m_followingSignal = makeWeakPtr(signal);
signal.addAlgorithm([weakThis = makeWeakPtr(this)] {
if (weakThis)
weakThis->signalAbort();
});
}
bool AbortSignal::whenSignalAborted(AbortSignal& signal, Ref<AbortAlgorithm>&& algorithm)
{
if (signal.aborted()) {
algorithm->handleEvent();
return true;
}
signal.addAlgorithm([algorithm = WTFMove(algorithm)]() mutable {
algorithm->handleEvent();
});
return false;
}
}
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