src/chrome/browser/metrics/variations/variations_request_scheduler_mobile.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_mobile.h"
   6
   7 #include "base/prefs/pref_service.h"
   8 #include "chrome/common/pref_names.h"
   9
  10 namespace chrome_variations {
  11
  12 namespace {
  13
  14 // Time before attempting a seed fetch after a ScheduleFetch(), in seconds.
  15 const int kScheduleFetchDelaySeconds = 5;
  16
  17 // Time between seed fetches, in hours.
  18 const int kSeedFetchPeriodHours = 5;
  19
  20 }  // namespace
  21
  22 VariationsRequestSchedulerMobile::VariationsRequestSchedulerMobile(
  23     const base::Closure& task,
  24     PrefService* local_state) :
  25   VariationsRequestScheduler(task), local_state_(local_state) {
  26 }
  27
  28 VariationsRequestSchedulerMobile::~VariationsRequestSchedulerMobile() {
  29 }
  30
  31 void VariationsRequestSchedulerMobile::Start() {
  32   // Check the time of the last request. If it has been longer than the fetch
  33   // period, run the task. Otherwise, do nothing. Note that no future requests
  34   // are scheduled since it is unlikely that the mobile process would live long
  35   // enough for the timer to fire.
  36   const base::Time last_fetch_time = base::Time::FromInternalValue(
  37       local_state_->GetInt64(prefs::kVariationsLastFetchTime));
  38   if (base::Time::Now() >
  39       last_fetch_time + base::TimeDelta::FromHours(kSeedFetchPeriodHours)) {
  40     last_request_time_ = base::Time::Now();
  41     task().Run();
  42   }
  43 }
  44
  45 void VariationsRequestSchedulerMobile::Reset() {
  46 }
  47
  48 void VariationsRequestSchedulerMobile::OnAppEnterForeground() {
  49   // Verify we haven't just attempted a fetch (which has not completed). This
  50   // is mainly used to verify we don't trigger a second fetch for the
  51   // OnAppEnterForeground right after startup.
  52   if (base::Time::Now() <
  53       last_request_time_ + base::TimeDelta::FromHours(kSeedFetchPeriodHours)) {
  54     return;
  55   }
  56
  57   // Since Start() launches a one-off execution, we can reuse it here. Also
  58   // note that since Start() verifies that the seed needs to be refreshed, we
  59   // do not verify here.
  60   schedule_fetch_timer_.Start(
  61       FROM_HERE,
  62       base::TimeDelta::FromSeconds(kScheduleFetchDelaySeconds),
  63       this,
  64       &VariationsRequestSchedulerMobile::Start);
  65 }
  66
  67 // static
  68 VariationsRequestScheduler* VariationsRequestScheduler::Create(
  69     const base::Closure& task,
  70     PrefService* local_state) {
  71   return new VariationsRequestSchedulerMobile(task, local_state);
  72 }
  73
  74 }  // namespace chrome_variations