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