1/*
2 * Copyright (C) 2019 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 <WebCore/Timer.h>
29#include <wtf/Deque.h>
30
31namespace WebKit {
32
33class Download;
34
35class DownloadMonitor {
36 WTF_MAKE_NONCOPYABLE(DownloadMonitor); WTF_MAKE_FAST_ALLOCATED;
37public:
38 DownloadMonitor(Download&);
39
40 void applicationDidEnterBackground();
41 void applicationWillEnterForeground();
42 void downloadReceivedBytes(uint64_t);
43 void timerFired();
44
45private:
46 Download& m_download;
47
48 double measuredThroughputRate() const;
49 uint32_t speedMultiplier() const;
50
51 struct Timestamp {
52 MonotonicTime time;
53 uint64_t bytesReceived;
54 };
55 static constexpr size_t timestampCapacity = 10;
56 Deque<Timestamp, timestampCapacity> m_timestamps;
57 WebCore::Timer m_timer { *this, &DownloadMonitor::timerFired };
58 size_t m_interval { 0 };
59};
60
61} // namespace WebKit
62