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      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 
     33 namespace WebCore {
     34 
     35 class DocumentLoadTiming;
     36 
     37 class ResourceLoadTiming : public RefCounted<ResourceLoadTiming> {
     38 public:
     39     static PassRefPtr<ResourceLoadTiming> create()
     40     {
     41         return adoptRef(new ResourceLoadTiming);
     42     }
     43 
     44     PassRefPtr<ResourceLoadTiming> deepCopy()
     45     {
     46         RefPtr<ResourceLoadTiming> timing = create();
     47         timing->requestTime = requestTime;
     48         timing->proxyStart = proxyStart;
     49         timing->proxyEnd = proxyEnd;
     50         timing->dnsStart = dnsStart;
     51         timing->dnsEnd = dnsEnd;
     52         timing->connectStart = connectStart;
     53         timing->connectEnd = connectEnd;
     54         timing->sendStart = sendStart;
     55         timing->sendEnd = sendEnd;
     56         timing->receiveHeadersEnd = receiveHeadersEnd;
     57         timing->sslStart = sslStart;
     58         timing->sslEnd = sslEnd;
     59         return timing.release();
     60     }
     61 
     62     bool operator==(const ResourceLoadTiming& other) const
     63     {
     64         return requestTime == other.requestTime
     65             && proxyStart == other.proxyStart
     66             && proxyEnd == other.proxyEnd
     67             && dnsStart == other.dnsStart
     68             && dnsEnd == other.dnsEnd
     69             && connectStart == other.connectStart
     70             && connectEnd == other.connectEnd
     71             && sendStart == other.sendStart
     72             && sendEnd == other.sendEnd
     73             && receiveHeadersEnd == other.receiveHeadersEnd
     74             && sslStart == other.sslStart
     75             && sslEnd == other.sslEnd;
     76     }
     77 
     78     bool operator!=(const ResourceLoadTiming& other) const
     79     {
     80         return !(*this == other);
     81     }
     82 
     83     // We want to present a unified timeline to Javascript. Using walltime is problematic, because the clock may skew while resources
     84     // load. To prevent that skew, we record a single reference walltime when root document navigation begins. All other times are
     85     // recorded using monotonicallyIncreasingTime(). When a time needs to be presented to Javascript, we build a pseudo-walltime
     86     // using the following equation (requestTime as example):
     87     //   pseudo time = document wall reference + (requestTime - document monotonic reference).
     88     double requestTime; // All monotonicallyIncreasingTime() in seconds
     89     double proxyStart;
     90     double proxyEnd;
     91     double dnsStart;
     92     double dnsEnd;
     93     double connectStart;
     94     double connectEnd;
     95     double sendStart;
     96     double sendEnd;
     97     double receiveHeadersEnd;
     98     double sslStart;
     99     double sslEnd;
    100 
    101     double calculateMillisecondDelta(double time) const { return time ? (time - requestTime) * 1000 : -1; }
    102 
    103 private:
    104     ResourceLoadTiming()
    105         : requestTime(0)
    106         , proxyStart(0)
    107         , proxyEnd(0)
    108         , dnsStart(0)
    109         , dnsEnd(0)
    110         , connectStart(0)
    111         , connectEnd(0)
    112         , sendStart(0)
    113         , sendEnd(0)
    114         , receiveHeadersEnd(0)
    115         , sslStart(0)
    116         , sslEnd(0)
    117     {
    118     }
    119 };
    120 
    121 }
    122 
    123 #endif
    124