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#pragma once
27
28#include <wtf/CompletionHandler.h>
29#include <wtf/MainThread.h>
30#include <wtf/ThreadSafeRefCounted.h>
31
32namespace WTF {
33
34class CallbackAggregator : public ThreadSafeRefCounted<CallbackAggregator> {
35public:
36 static Ref<CallbackAggregator> create(CompletionHandler<void()>&& callback) { return adoptRef(*new CallbackAggregator(WTFMove(callback))); }
37
38 ~CallbackAggregator()
39 {
40 ASSERT(m_wasConstructedOnMainThread == isMainThread());
41 if (m_callback)
42 m_callback();
43 }
44
45private:
46 explicit CallbackAggregator(CompletionHandler<void()>&& callback)
47 : m_callback(WTFMove(callback))
48#if !ASSERT_DISABLED
49 , m_wasConstructedOnMainThread(isMainThread())
50#endif
51 {
52 }
53
54 CompletionHandler<void()> m_callback;
55#if !ASSERT_DISABLED
56 bool m_wasConstructedOnMainThread;
57#endif
58};
59
60} // namespace WTF
61
62using WTF::CallbackAggregator;
63