ash/metrics/task_switch_metrics_recorder.cc

   1 // Copyright 2015 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 #include "ash/metrics/task_switch_metrics_recorder.h"
   6
   7 #include "ash/metrics/task_switch_time_tracker.h"
   8
   9 namespace ash {
  10
  11 namespace {
  12
  13 const char kShelfHistogramName[] =
  14     "Ash.Shelf.TimeBetweenNavigateToTaskSwitches";
  15
  16 const char kTabStripHistogramName[] =
  17     "Ash.Tab.TimeBetweenSwitchToExistingTabUserActions";
  18
  19 const char kAcceleratorWindowCycleHistogramName[] =
  20     "Ash.WindowCycleController.TimeBetweenTaskSwitches";
  21
  22 const char kAppListHistogramName[] = "Ash.AppList.TimeBetweenTaskSwitches";
  23
  24 const char kOverviewModeHistogramName[] =
  25     "Ash.WindowSelector.TimeBetweenActiveWindowChanges";
  26
  27 // Returns the histogram name for the given |task_switch_source|.
  28 const char* GetHistogramName(
  29     TaskSwitchMetricsRecorder::TaskSwitchSource task_switch_source) {
  30   switch (task_switch_source) {
  31     case TaskSwitchMetricsRecorder::kAppList:
  32       return kAppListHistogramName;
  33     case TaskSwitchMetricsRecorder::kOverviewMode:
  34       return kOverviewModeHistogramName;
  35     case TaskSwitchMetricsRecorder::kShelf:
  36       return kShelfHistogramName;
  37     case TaskSwitchMetricsRecorder::kTabStrip:
  38       return kTabStripHistogramName;
  39     case TaskSwitchMetricsRecorder::kWindowCycleController:
  40       return kAcceleratorWindowCycleHistogramName;
  41   }
  42   NOTREACHED();
  43   return nullptr;
  44 }
  45
  46 }  // namespace
  47
  48 TaskSwitchMetricsRecorder::TaskSwitchMetricsRecorder() {
  49 }
  50
  51 TaskSwitchMetricsRecorder::~TaskSwitchMetricsRecorder() {
  52 }
  53
  54 void TaskSwitchMetricsRecorder::OnTaskSwitch(
  55     TaskSwitchSource task_switch_source) {
  56   TaskSwitchTimeTracker* task_switch_time_tracker =
  57       FindTaskSwitchTimeTracker(task_switch_source);
  58   if (!task_switch_time_tracker)
  59     AddTaskSwitchTimeTracker(task_switch_source);
  60
  61   task_switch_time_tracker = FindTaskSwitchTimeTracker(task_switch_source);
  62   CHECK(task_switch_time_tracker);
  63
  64   task_switch_time_tracker->OnTaskSwitch();
  65 }
  66
  67 TaskSwitchTimeTracker* TaskSwitchMetricsRecorder::FindTaskSwitchTimeTracker(
  68     TaskSwitchSource task_switch_source) {
  69   return histogram_map_.get(task_switch_source);
  70 }
  71
  72 void TaskSwitchMetricsRecorder::AddTaskSwitchTimeTracker(
  73     TaskSwitchSource task_switch_source) {
  74   CHECK(histogram_map_.find(task_switch_source) == histogram_map_.end());
  75
  76   const char* histogram_name = GetHistogramName(task_switch_source);
  77   DCHECK(histogram_name);
  78
  79   histogram_map_.add(
  80       task_switch_source,
  81       make_scoped_ptr(new TaskSwitchTimeTracker(histogram_name)));
  82 }
  83
  84 }  // namespace ash