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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/metrics/variations/variations_request_scheduler_mobile.h"
#include "base/prefs/pref_service.h"
#include "chrome/common/pref_names.h"
namespace chrome_variations {
namespace {
// Time before attempting a seed fetch after a ScheduleFetch(), in seconds.
const int kScheduleFetchDelaySeconds = 5;
// Time between seed fetches, in hours.
const int kSeedFetchPeriodHours = 5;
} // namespace
VariationsRequestSchedulerMobile::VariationsRequestSchedulerMobile(
const base::Closure& task,
PrefService* local_state) :
VariationsRequestScheduler(task), local_state_(local_state) {
}
VariationsRequestSchedulerMobile::~VariationsRequestSchedulerMobile() {
}
void VariationsRequestSchedulerMobile::Start() {
// Check the time of the last request. If it has been longer than the fetch
// period, run the task. Otherwise, do nothing. Note that no future requests
// are scheduled since it is unlikely that the mobile process would live long
// enough for the timer to fire.
const base::Time last_fetch_time = base::Time::FromInternalValue(
local_state_->GetInt64(prefs::kVariationsLastFetchTime));
if (base::Time::Now() >
last_fetch_time + base::TimeDelta::FromHours(kSeedFetchPeriodHours)) {
last_request_time_ = base::Time::Now();
task().Run();
}
}
void VariationsRequestSchedulerMobile::Reset() {
}
void VariationsRequestSchedulerMobile::OnAppEnterForeground() {
// Verify we haven't just attempted a fetch (which has not completed). This
// is mainly used to verify we don't trigger a second fetch for the
// OnAppEnterForeground right after startup.
if (base::Time::Now() <
last_request_time_ + base::TimeDelta::FromHours(kSeedFetchPeriodHours)) {
return;
}
// Since Start() launches a one-off execution, we can reuse it here. Also
// note that since Start() verifies that the seed needs to be refreshed, we
// do not verify here.
schedule_fetch_timer_.Start(
FROM_HERE,
base::TimeDelta::FromSeconds(kScheduleFetchDelaySeconds),
this,
&VariationsRequestSchedulerMobile::Start);
}
// static
VariationsRequestScheduler* VariationsRequestScheduler::Create(
const base::Closure& task,
PrefService* local_state) {
return new VariationsRequestSchedulerMobile(task, local_state);
}
} // namespace chrome_variations
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