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: create()39 static PassRefPtr<ResourceLoadTiming> create() 40 { 41 return adoptRef(new ResourceLoadTiming); 42 } 43 deepCopy()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 calculateMillisecondDelta(double time)101 double calculateMillisecondDelta(double time) const { return time ? (time - requestTime) * 1000 : -1; } 102 103 private: ResourceLoadTiming()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