1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_HISTOGRAMS_H_ 6 #define CHROME_BROWSER_PRERENDER_PRERENDER_HISTOGRAMS_H_ 7 8 #include <string> 9 10 #include "base/time/time.h" 11 #include "chrome/browser/prerender/prerender_contents.h" 12 #include "chrome/browser/prerender/prerender_events.h" 13 #include "chrome/browser/prerender/prerender_final_status.h" 14 #include "chrome/browser/prerender/prerender_local_predictor.h" 15 #include "chrome/browser/prerender/prerender_origin.h" 16 #include "url/gurl.h" 17 18 namespace prerender { 19 20 // Navigation type for histograms. 21 enum NavigationType { 22 // A normal completed navigation. 23 NAVIGATION_TYPE_NORMAL, 24 // A completed navigation or swap that began as a prerender. 25 NAVIGATION_TYPE_PRERENDERED, 26 // A normal completed navigation in the control group or with a control 27 // prerender that would have been prerendered. 28 NAVIGATION_TYPE_WOULD_HAVE_BEEN_PRERENDERED, 29 NAVIGATION_TYPE_MAX, 30 }; 31 32 // PrerenderHistograms is responsible for recording all prerender specific 33 // histograms for PrerenderManager. It keeps track of the type of prerender 34 // currently underway (based on the PrerenderOrigin of the most recent 35 // prerenders, and any experiments detected). 36 // PrerenderHistograms does not necessarily record all histograms related to 37 // prerendering, only the ones in the context of PrerenderManager. 38 class PrerenderHistograms { 39 public: 40 // Owned by a PrerenderManager object for the lifetime of the 41 // PrerenderManager. 42 PrerenderHistograms(); 43 44 // Records the perceived page load time for a page - effectively the time from 45 // when the user navigates to a page to when it finishes loading. The actual 46 // load may have started prior to navigation due to prerender hints. 47 void RecordPerceivedPageLoadTime(Origin origin, 48 base::TimeDelta perceived_page_load_time, 49 NavigationType navigation_type, 50 const GURL& url); 51 52 // Records, in a histogram, the percentage of the page load time that had 53 // elapsed by the time it is swapped in. Values outside of [0, 1.0] are 54 // invalid and ignored. 55 void RecordPercentLoadDoneAtSwapin(Origin origin, double fraction) const; 56 57 // Records the actual pageload time of a prerender that has not been swapped 58 // in yet, but finished loading. 59 void RecordPageLoadTimeNotSwappedIn(Origin origin, 60 base::TimeDelta page_load_time, 61 const GURL& url) const; 62 63 // Records the time from when a page starts prerendering to when the user 64 // navigates to it. This must be called on the UI thread. 65 void RecordTimeUntilUsed(Origin origin, 66 base::TimeDelta time_until_used) const; 67 68 // Records the time from when a prerender is abandoned to when the user 69 // navigates to it. This must be called on the UI thread. 70 void RecordAbandonTimeUntilUsed(Origin origin, 71 base::TimeDelta time_until_used) const; 72 73 // Record a PerSessionCount data point. 74 void RecordPerSessionCount(Origin origin, int count) const; 75 76 // Record time between two prerender requests. 77 void RecordTimeBetweenPrerenderRequests(Origin origin, 78 base::TimeDelta time) const; 79 80 // Record a final status of a prerendered page in a histogram. 81 void RecordFinalStatus(Origin origin, 82 uint8 experiment_id, 83 PrerenderContents::MatchCompleteStatus mc_status, 84 FinalStatus final_status) const; 85 86 // To be called when a new prerender is added. 87 void RecordPrerender(Origin origin, const GURL& url); 88 89 // To be called when a new prerender is started. 90 void RecordPrerenderStarted(Origin origin) const; 91 92 // To be called when we know how many prerenders are running after starting 93 // a prerender. 94 void RecordConcurrency(size_t prerender_count) const; 95 96 // Called when we swap in a prerender. 97 void RecordUsedPrerender(Origin origin) const; 98 99 // Record the time since a page was recently visited. 100 void RecordTimeSinceLastRecentVisit(Origin origin, 101 base::TimeDelta time) const; 102 103 // Records a prerender event. 104 void RecordEvent(Origin origin, uint8 experiment_id, PrerenderEvent event) 105 const; 106 107 // Record a prerender cookie status bitmap. Must be in the range 108 // [0, PrerenderContents::kNumCookieStatuses). 109 void RecordCookieStatus(Origin origin, 110 uint8 experiment_id, 111 int cookie_status) const; 112 113 // Record a prerender cookie send type. Must be in the range 114 // [0, PrerenderContents::kNumCookieSendTypes). 115 void RecordCookieSendType(Origin origin, 116 uint8 experiment_id, 117 int cookie_send_type) const; 118 119 void RecordPrerenderPageVisitedStatus(Origin origin, 120 uint8 experiment_id, 121 bool visited_before) const; 122 123 // Record the bytes in the prerender, whether it was used or not, and the 124 // total number of bytes fetched for this profile since the last call to 125 // RecordBytes. 126 void RecordNetworkBytes(Origin origin, 127 bool used, 128 int64 prerender_bytes, 129 int64 profile_bytes); 130 131 private: 132 base::TimeTicks GetCurrentTimeTicks() const; 133 134 // Returns the time elapsed since the last prerender happened. 135 base::TimeDelta GetTimeSinceLastPrerender() const; 136 137 // Returns whether the PrerenderManager is currently within the prerender 138 // window - effectively, up to 30 seconds after a prerender tag has been 139 // observed. 140 bool WithinWindow() const; 141 142 // Returns the current experiment. 143 uint8 GetCurrentExperimentId() const; 144 145 // Returns whether or not there is currently an origin/experiment wash. 146 bool IsOriginExperimentWash() const; 147 148 // An integer indicating a Prerendering Experiment being currently conducted. 149 // (The last experiment ID seen). 150 uint8 last_experiment_id_; 151 152 // Origin of the last prerender seen. 153 Origin last_origin_; 154 155 // A boolean indicating that we have recently encountered a combination of 156 // different experiments and origins, making an attribution of PPLT's to 157 // experiments / origins impossible. 158 bool origin_experiment_wash_; 159 160 // The time when we last saw a prerender request coming from a renderer. 161 // This is used to record perceived PLT's for a certain amount of time 162 // from the point that we last saw a <link rel=prerender> tag. 163 base::TimeTicks last_prerender_seen_time_; 164 165 // Indicates whether we have recorded page load events after the most 166 // recent prerender. These must be initialized to true, so that we don't 167 // start recording events before the first prerender occurs. 168 bool seen_any_pageload_; 169 bool seen_pageload_started_after_prerender_; 170 171 DISALLOW_COPY_AND_ASSIGN(PrerenderHistograms); 172 }; 173 174 } // namespace prerender 175 176 #endif // CHROME_BROWSER_PRERENDER_PRERENDER_HISTOGRAMS_H_ 177
