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 | |
34 | namespace WebCore { |
35 | |
36 | WTF_MAKE_ISO_ALLOCATED_IMPL(AbortSignal); |
37 | |
38 | Ref<AbortSignal> AbortSignal::create(ScriptExecutionContext& context) |
39 | { |
40 | return adoptRef(*new AbortSignal(context)); |
41 | } |
42 | |
43 | AbortSignal::AbortSignal(ScriptExecutionContext& context) |
44 | : ContextDestructionObserver(&context) |
45 | { |
46 | } |
47 | |
48 | // https://dom.spec.whatwg.org/#abortsignal-signal-abort |
49 | void 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 |
68 | void 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 | |