1/*
2 * Copyright (C) 2010 Google, 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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef ResourceLoadTiming_h
27#define ResourceLoadTiming_h
28
29#include "wtf/PassRefPtr.h"
30#include "wtf/RefCounted.h"
31#include "wtf/RefPtr.h"
32
33namespace blink {
34
35class ResourceLoadTiming : public RefCounted<ResourceLoadTiming> {
36public:
37    static PassRefPtr<ResourceLoadTiming> create()
38    {
39        return adoptRef(new ResourceLoadTiming);
40    }
41
42    PassRefPtr<ResourceLoadTiming> deepCopy()
43    {
44        RefPtr<ResourceLoadTiming> timing = create();
45        timing->requestTime = requestTime;
46        timing->proxyStart = proxyStart;
47        timing->proxyEnd = proxyEnd;
48        timing->dnsStart = dnsStart;
49        timing->dnsEnd = dnsEnd;
50        timing->connectStart = connectStart;
51        timing->connectEnd = connectEnd;
52        timing->serviceWorkerFetchStart = serviceWorkerFetchStart;
53        timing->serviceWorkerFetchReady = serviceWorkerFetchReady;
54        timing->serviceWorkerFetchEnd = serviceWorkerFetchEnd;
55        timing->sendStart = sendStart;
56        timing->sendEnd = sendEnd;
57        timing->receiveHeadersEnd = receiveHeadersEnd;
58        timing->sslStart = sslStart;
59        timing->sslEnd = sslEnd;
60        return timing.release();
61    }
62
63    bool operator==(const ResourceLoadTiming& other) const
64    {
65        return requestTime == other.requestTime
66            && proxyStart == other.proxyStart
67            && proxyEnd == other.proxyEnd
68            && dnsStart == other.dnsStart
69            && dnsEnd == other.dnsEnd
70            && connectStart == other.connectStart
71            && connectEnd == other.connectEnd
72            && serviceWorkerFetchStart == other.serviceWorkerFetchStart
73            && serviceWorkerFetchReady == other.serviceWorkerFetchReady
74            && serviceWorkerFetchEnd == other.serviceWorkerFetchEnd
75            && sendStart == other.sendStart
76            && sendEnd == other.sendEnd
77            && receiveHeadersEnd == other.receiveHeadersEnd
78            && sslStart == other.sslStart
79            && sslEnd == other.sslEnd;
80    }
81
82    bool operator!=(const ResourceLoadTiming& other) const
83    {
84        return !(*this == other);
85    }
86
87    // We want to present a unified timeline to Javascript. Using walltime is problematic, because the clock may skew while resources
88    // load. To prevent that skew, we record a single reference walltime when root document navigation begins. All other times are
89    // recorded using monotonicallyIncreasingTime(). When a time needs to be presented to Javascript, we build a pseudo-walltime
90    // using the following equation (requestTime as example):
91    //   pseudo time = document wall reference + (requestTime - document monotonic reference).
92    double requestTime; // All monotonicallyIncreasingTime() in seconds
93    double proxyStart;
94    double proxyEnd;
95    double dnsStart;
96    double dnsEnd;
97    double connectStart;
98    double connectEnd;
99    double serviceWorkerFetchStart;
100    double serviceWorkerFetchReady;
101    double serviceWorkerFetchEnd;
102    double sendStart;
103    double sendEnd;
104    double receiveHeadersEnd;
105    double sslStart;
106    double sslEnd;
107
108    double calculateMillisecondDelta(double time) const { return time ? (time - requestTime) * 1000 : -1; }
109
110private:
111    ResourceLoadTiming()
112        : requestTime(0)
113        , proxyStart(0)
114        , proxyEnd(0)
115        , dnsStart(0)
116        , dnsEnd(0)
117        , connectStart(0)
118        , connectEnd(0)
119        , serviceWorkerFetchStart(0)
120        , serviceWorkerFetchReady(0)
121        , serviceWorkerFetchEnd(0)
122        , sendStart(0)
123        , sendEnd(0)
124        , receiveHeadersEnd(0)
125        , sslStart(0)
126        , sslEnd(0)
127    {
128    }
129};
130
131}
132
133#endif
134