root/chrome/browser/metrics/metrics_service_android.cc

DEFINITIONS

1. IncrementListValue
2. GetActivityFlag
3. RegisterPrefsAndroid
4. LogAndroidStabilityToPrefs
5. ConvertAndroidStabilityPrefsToHistograms
6. OnForegroundActivityChanged
7. DiscardOldStabilityStatsAndroid

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/metrics/metrics_service.h"

#include "base/metrics/histogram.h"
#include "base/prefs/pref_registry_simple.h"
#include "base/prefs/pref_service.h"
#include "base/prefs/scoped_user_pref_update.h"
#include "base/values.h"
#include "chrome/browser/android/activity_type_ids.h"
#include "chrome/browser/browser_process.h"
#include "chrome/common/pref_names.h"

namespace {

// Increments a particular entry in the ListValue.
void IncrementListValue(base::ListValue* counts, int index) {
  int current_count = 0;
  counts->GetInteger(index, &current_count);
  counts->Set(index, new base::FundamentalValue(current_count + 1));
}

// Takes an int corresponding to a Type and returns the corresponding flag.
int GetActivityFlag(int type_id) {
  ActivityTypeIds::Type type = ActivityTypeIds::GetActivityType(type_id);
  DCHECK_LT(type, ActivityTypeIds::ACTIVITY_MAX_VALUE);
  return (1 << type);
}

}  // namespace

// static
void MetricsService::RegisterPrefsAndroid(PrefRegistrySimple* registry) {
  registry->RegisterIntegerPref(prefs::kStabilityForegroundActivityType,
                                ActivityTypeIds::ACTIVITY_NONE);
  registry->RegisterIntegerPref(prefs::kStabilityLaunchedActivityFlags, 0);
  registry->RegisterListPref(prefs::kStabilityLaunchedActivityCounts);
  registry->RegisterListPref(prefs::kStabilityCrashedActivityCounts);
}

void MetricsService::LogAndroidStabilityToPrefs(PrefService* pref) {
  // Track which Activities were launched by the user.
  // A 'launch' is defined as starting the Activity at least once during a
  // UMA session.  Multiple launches are counted only once since it is possible
  // for users to hop between Activities (e.g. entering and leaving Settings).
  int launched = pref->GetInteger(prefs::kStabilityLaunchedActivityFlags);
  ListPrefUpdate update_launches(pref, prefs::kStabilityLaunchedActivityCounts);
  base::ListValue* launch_counts = update_launches.Get();
  for (int activity_type = ActivityTypeIds::ACTIVITY_NONE;
       activity_type < ActivityTypeIds::ACTIVITY_MAX_VALUE;
       ++activity_type) {
    if (launched & GetActivityFlag(activity_type))
      IncrementListValue(launch_counts, activity_type);
  }
  pref->SetInteger(prefs::kStabilityLaunchedActivityFlags, 0);

  // Track any Activities that were in the foreground when Chrome died.
  // These Activities failed to be recorded as leaving the foreground, so Chrome
  // couldn't have ended the UMA session cleanly.  Record them as crashing.
  int foreground = pref->GetInteger(prefs::kStabilityForegroundActivityType);
  if (foreground != ActivityTypeIds::ACTIVITY_NONE) {
    ListPrefUpdate update_crashes(pref, prefs::kStabilityCrashedActivityCounts);
    base::ListValue* crash_counts = update_crashes.Get();
    IncrementListValue(crash_counts, foreground);
    pref->SetInteger(prefs::kStabilityForegroundActivityType,
                     ActivityTypeIds::ACTIVITY_NONE);
  }

  pref->CommitPendingWrite();
}

void MetricsService::ConvertAndroidStabilityPrefsToHistograms(
    PrefService* pref) {
  ListPrefUpdate launch_updater(pref, prefs::kStabilityLaunchedActivityCounts);
  ListPrefUpdate crash_updater(pref, prefs::kStabilityCrashedActivityCounts);

  base::ListValue* launch_counts = launch_updater.Get();
  base::ListValue* crash_counts = crash_updater.Get();

  for (int activity_type = ActivityTypeIds::ACTIVITY_NONE;
       activity_type < ActivityTypeIds::ACTIVITY_MAX_VALUE;
       ++activity_type) {
    int launch_count = 0;
    int crash_count = 0;

    launch_counts->GetInteger(activity_type, &launch_count);
    crash_counts->GetInteger(activity_type, &crash_count);

    for (int count = 0; count < launch_count; ++count) {
      UMA_STABILITY_HISTOGRAM_ENUMERATION(
          "Chrome.Android.Activity.LaunchCounts",
          activity_type,
          ActivityTypeIds::ACTIVITY_MAX_VALUE);
    }

    for (int count = 0; count < crash_count; ++count) {
      UMA_STABILITY_HISTOGRAM_ENUMERATION("Chrome.Android.Activity.CrashCounts",
                                          activity_type,
                                          ActivityTypeIds::ACTIVITY_MAX_VALUE);
    }
  }

  launch_counts->Clear();
  crash_counts->Clear();
}

void MetricsService::OnForegroundActivityChanged(PrefService* pref,
                                                 ActivityTypeIds::Type type) {
  DCHECK(type < ActivityTypeIds::ACTIVITY_MAX_VALUE);

  int activity_type = pref->GetInteger(prefs::kStabilityForegroundActivityType);
  if (activity_type == type)
    return;

  // Record that the Activity is now in the foreground.
  pref->SetInteger(prefs::kStabilityForegroundActivityType, type);

  // Record that the Activity was launched this sesaion.
  // The pref stores a set of flags ORed together, where each set flag
  // corresponds to a launched Activity type.
  int launched = pref->GetInteger(prefs::kStabilityLaunchedActivityFlags);
  if (type != ActivityTypeIds::ACTIVITY_NONE) {
    launched |= GetActivityFlag(type);
    pref->SetInteger(prefs::kStabilityLaunchedActivityFlags, launched);
  }

  pref->CommitPendingWrite();
}

// static
void MetricsService::DiscardOldStabilityStatsAndroid(PrefService* local_state) {
  local_state->SetInteger(prefs::kStabilityForegroundActivityType,
                          ActivityTypeIds::ACTIVITY_NONE);
  local_state->SetInteger(prefs::kStabilityLaunchedActivityFlags, 0);

  ListPrefUpdate launches(local_state, prefs::kStabilityLaunchedActivityCounts);
  launches.Get()->Clear();

  ListPrefUpdate crashes(local_state, prefs::kStabilityCrashedActivityCounts);
  crashes.Get()->Clear();
}