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 75
