mirror of
https://github.com/flutter/flutter.git
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122 lines
4.2 KiB
C++
122 lines
4.2 KiB
C++
/*
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* Copyright (C) 2010 Google, Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ResourceLoadTiming_h
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#define ResourceLoadTiming_h
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#include "wtf/PassRefPtr.h"
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#include "wtf/RefCounted.h"
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#include "wtf/RefPtr.h"
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namespace blink {
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class ResourceLoadTiming : public RefCounted<ResourceLoadTiming> {
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public:
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static PassRefPtr<ResourceLoadTiming> create()
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{
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return adoptRef(new ResourceLoadTiming);
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}
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PassRefPtr<ResourceLoadTiming> deepCopy()
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{
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RefPtr<ResourceLoadTiming> timing = create();
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timing->requestTime = requestTime;
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timing->proxyStart = proxyStart;
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timing->proxyEnd = proxyEnd;
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timing->dnsStart = dnsStart;
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timing->dnsEnd = dnsEnd;
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timing->connectStart = connectStart;
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timing->connectEnd = connectEnd;
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timing->sendStart = sendStart;
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timing->sendEnd = sendEnd;
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timing->receiveHeadersEnd = receiveHeadersEnd;
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timing->sslStart = sslStart;
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timing->sslEnd = sslEnd;
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return timing.release();
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}
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bool operator==(const ResourceLoadTiming& other) const
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{
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return requestTime == other.requestTime
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&& proxyStart == other.proxyStart
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&& proxyEnd == other.proxyEnd
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&& dnsStart == other.dnsStart
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&& dnsEnd == other.dnsEnd
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&& connectStart == other.connectStart
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&& connectEnd == other.connectEnd
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&& sendStart == other.sendStart
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&& sendEnd == other.sendEnd
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&& receiveHeadersEnd == other.receiveHeadersEnd
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&& sslStart == other.sslStart
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&& sslEnd == other.sslEnd;
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}
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bool operator!=(const ResourceLoadTiming& other) const
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{
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return !(*this == other);
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}
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// We want to present a unified timeline to Javascript. Using walltime is problematic, because the clock may skew while resources
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// load. To prevent that skew, we record a single reference walltime when root document navigation begins. All other times are
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// recorded using monotonicallyIncreasingTime(). When a time needs to be presented to Javascript, we build a pseudo-walltime
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// using the following equation (requestTime as example):
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// pseudo time = document wall reference + (requestTime - document monotonic reference).
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double requestTime; // All monotonicallyIncreasingTime() in seconds
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double proxyStart;
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double proxyEnd;
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double dnsStart;
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double dnsEnd;
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double connectStart;
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double connectEnd;
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double sendStart;
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double sendEnd;
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double receiveHeadersEnd;
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double sslStart;
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double sslEnd;
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double calculateMillisecondDelta(double time) const { return time ? (time - requestTime) * 1000 : -1; }
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private:
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ResourceLoadTiming()
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: requestTime(0)
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, proxyStart(0)
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, proxyEnd(0)
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, dnsStart(0)
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, dnsEnd(0)
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, connectStart(0)
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, connectEnd(0)
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, sendStart(0)
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, sendEnd(0)
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, receiveHeadersEnd(0)
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, sslStart(0)
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, sslEnd(0)
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{
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}
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};
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}
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#endif
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