1/*
2 * Copyright (C) 2017 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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "AbortSignal.h"
28
29#include "Event.h"
30#include "EventNames.h"
31#include "ScriptExecutionContext.h"
32#include <wtf/IsoMallocInlines.h>
33
34namespace WebCore {
35
36WTF_MAKE_ISO_ALLOCATED_IMPL(AbortSignal);
37
38Ref<AbortSignal> AbortSignal::create(ScriptExecutionContext& context)
39{
40 return adoptRef(*new AbortSignal(context));
41}
42
43AbortSignal::AbortSignal(ScriptExecutionContext& context)
44 : ContextDestructionObserver(&context)
45{
46}
47
48// https://dom.spec.whatwg.org/#abortsignal-signal-abort
49void AbortSignal::abort()
50{
51 // 1. If signal's aborted flag is set, then return.
52 if (m_aborted)
53 return;
54
55 // 2. Set signal’s aborted flag.
56 m_aborted = true;
57
58 auto protectedThis = makeRef(*this);
59 auto algorithms = WTFMove(m_algorithms);
60 for (auto& algorithm : algorithms)
61 algorithm();
62
63 // 5. Fire an event named abort at signal.
64 dispatchEvent(Event::create(eventNames().abortEvent, Event::CanBubble::No, Event::IsCancelable::No));
65}
66
67// https://dom.spec.whatwg.org/#abortsignal-follow
68void AbortSignal::follow(AbortSignal& signal)
69{
70 if (aborted())
71 return;
72
73 if (signal.aborted()) {
74 abort();
75 return;
76 }
77
78 signal.addAlgorithm([weakThis = makeWeakPtr(this)] {
79 if (!weakThis)
80 return;
81 weakThis->abort();
82 });
83}
84
85}
86