chrome/browser/metrics/variations/variations_request_scheduler.cc

   1 // Copyright (c) 2013 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 "chrome/browser/metrics/variations/variations_request_scheduler.h"
   6
   7 #include "base/strings/string_number_conversions.h"
   8 #include "components/variations/variations_associated_data.h"
   9
  10 namespace chrome_variations {
  11
  12 namespace {
  13
  14 // Returns the time interval between variations seed fetches.
  15 base::TimeDelta GetFetchPeriod() {
  16   // The fetch interval can be overridden by a variation param.
  17   std::string period_min_str =
  18       variations::GetVariationParamValue("VarationsServiceControl",
  19                                          "fetch_period_min");
  20   size_t period_min;
  21   if (base::StringToSizeT(period_min_str, &period_min))
  22     return base::TimeDelta::FromMinutes(period_min);
  23
  24   // The default fetch interval is every 5 hours.
  25   return base::TimeDelta::FromHours(5);
  26 }
  27
  28 }  // namespace
  29
  30 VariationsRequestScheduler::VariationsRequestScheduler(
  31     const base::Closure& task) : task_(task) {
  32 }
  33
  34 VariationsRequestScheduler::~VariationsRequestScheduler() {
  35 }
  36
  37 void VariationsRequestScheduler::Start() {
  38   task_.Run();
  39   timer_.Start(FROM_HERE, GetFetchPeriod(), task_);
  40 }
  41
  42 void VariationsRequestScheduler::Reset() {
  43   if (timer_.IsRunning())
  44     timer_.Reset();
  45   one_shot_timer_.Stop();
  46 }
  47
  48 void VariationsRequestScheduler::ScheduleFetchShortly() {
  49   // Reset the regular timer to avoid it triggering soon after.
  50   Reset();
  51   // The delay before attempting a fetch shortly, in minutes.
  52   const int kFetchShortlyDelayMinutes = 5;
  53   one_shot_timer_.Start(FROM_HERE,
  54                         base::TimeDelta::FromMinutes(kFetchShortlyDelayMinutes),
  55                         task_);
  56 }
  57
  58 void VariationsRequestScheduler::OnAppEnterForeground() {
  59   NOTREACHED() << "Attempted to OnAppEnterForeground on non-mobile device";
  60 }
  61
  62 base::Closure VariationsRequestScheduler::task() const {
  63   return task_;
  64 }
  65
  66 #if !defined(OS_ANDROID) && !defined(OS_IOS)
  67 // static
  68 VariationsRequestScheduler* VariationsRequestScheduler::Create(
  69     const base::Closure& task,
  70     PrefService* local_state) {
  71   return new VariationsRequestScheduler(task);
  72 }
  73 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)
  74
  75 }  // namespace chrome_variations