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