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_PERFORMANCE_MONITOR_STARTUP_TIMER_H_ 6 #define CHROME_BROWSER_PERFORMANCE_MONITOR_STARTUP_TIMER_H_ 7 8 #include "base/time/time.h" 9 #include "content/public/browser/notification_observer.h" 10 #include "content/public/browser/notification_registrar.h" 11 12 namespace performance_monitor { 13 14 // This class is responsible for recording the startup and session restore times 15 // (if applicable) for PerformanceMonitor. This allows us to initialize this 16 // relatively small object early in the startup process, and start the whole of 17 // PerformanceMonitor at a later time. StartupTimer will record the times and 18 // insert them into PerformanceMonitor's database. 19 class StartupTimer : public content::NotificationObserver { 20 public: 21 // Indicates the type of startup; i.e. either a normal startup or a testing 22 // environment. 23 enum StartupType { 24 STARTUP_NORMAL, 25 STARTUP_TEST 26 }; 27 28 StartupTimer(); 29 virtual ~StartupTimer(); 30 31 // Inform StartupTimer that the startup process has been completed; stop the 32 // timer. Returns false if the timer has already stopped. 33 bool SignalStartupComplete(StartupType startup_type); 34 35 // Pauses the timer until UnpauseTimer() is called; any time spent within a 36 // pause does not count towards the measured startup time. This will DCHECK if 37 // PauseTimer() is called while paused or UnpauseTimer() is called while 38 // unpaused. 39 static void PauseTimer(); 40 static void UnpauseTimer(); 41 42 // content::NotificationObserver 43 // We keep track of whether or not PerformanceMonitor has been started via 44 // the PERFORMANCE_MONITOR_INITIALIZED notification; we need to know this so 45 // we know when to insert startup data into the database. We either insert 46 // data as we gather it (if PerformanceMonitor is started prior to data 47 // collection) or at the notification (if PerformanceMonitor is started 48 // later). 49 virtual void Observe(int type, 50 const content::NotificationSource& source, 51 const content::NotificationDetails& details) OVERRIDE; 52 53 static void SetElapsedSessionRestoreTime( 54 const base::TimeDelta& elapsed_session_restore_time); 55 56 private: 57 // Insert the elapsed time measures into PerformanceMonitor's database. 58 void InsertElapsedStartupTime(); 59 void InsertElapsedSessionRestoreTime(); 60 61 // The time at which the startup process begins (the creation of 62 // ChromeBrowserMain). 63 base::TimeTicks startup_begin_; 64 65 // The time at which the timer was most recently paused, or null if the timer 66 // is not currently paused. 67 base::TimeTicks pause_started_; 68 69 // The total duration for which the timer has been paused. 70 base::TimeDelta total_pause_; 71 72 // A flag of whether or not this was a "normal" startup (e.g. whether or not 73 // this was in a testing environment, which would change the startup time 74 // values). If it is not a normal startup, we use a different metric. 75 StartupType startup_type_; 76 77 // The total duration of the startup process, minus any pauses. 78 base::TimeDelta elapsed_startup_time_; 79 80 // The total duration of the session restore(s), if any occurred. This is 81 // independent of the startup time, because: 82 // - If the user has auto-restore on, the restore is synchronous, and we pause 83 // the startup timer during the session restore; the restore will not 84 // interfere with startup timing. 85 // - If Chrome crashed and the user chooses to restore the crashed session, 86 // then the startup is already completed; the restore will not interfere 87 // with startup timing. 88 std::vector<base::TimeDelta> elapsed_session_restore_times_; 89 90 // Flag whether or not PerformanceMonitor has been fully started. 91 bool performance_monitor_initialized_; 92 93 content::NotificationRegistrar registrar_; 94 95 // The singleton of this class. 96 static StartupTimer* g_startup_timer_; 97 98 DISALLOW_COPY_AND_ASSIGN(StartupTimer); 99 }; 100 101 } // namespace performance_monitor 102 103 #endif // CHROME_BROWSER_PERFORMANCE_MONITOR_STARTUP_TIMER_H_ 104
