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// Copyright 2014 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 "components/metrics/daily_event.h"
#include "base/i18n/time_formatting.h"
#include "base/metrics/histogram.h"
#include "base/prefs/pref_registry_simple.h"
#include "base/prefs/pref_service.h"
namespace metrics {
namespace {
enum IntervalType {
FIRST_RUN,
DAY_ELAPSED,
CLOCK_CHANGED,
NUM_INTERVAL_TYPES
};
void RecordIntervalTypeHistogram(const std::string& histogram_name,
IntervalType type) {
base::Histogram::FactoryGet(
histogram_name,
1,
NUM_INTERVAL_TYPES,
NUM_INTERVAL_TYPES + 1,
base::HistogramBase::kUmaTargetedHistogramFlag)->Add(type);
}
} // namespace
DailyEvent::Observer::Observer() {
}
DailyEvent::Observer::~Observer() {
}
DailyEvent::DailyEvent(PrefService* pref_service,
const char* pref_name,
const std::string& histogram_name)
: pref_service_(pref_service),
pref_name_(pref_name),
histogram_name_(histogram_name) {
}
DailyEvent::~DailyEvent() {
}
// static
void DailyEvent::RegisterPref(PrefRegistrySimple* registry,
const char* pref_name) {
registry->RegisterInt64Pref(pref_name, base::Time().ToInternalValue());
}
void DailyEvent::AddObserver(scoped_ptr<DailyEvent::Observer> observer) {
DVLOG(2) << "DailyEvent observer added.";
DCHECK(last_fired_.is_null());
observers_.push_back(observer.release());
}
void DailyEvent::CheckInterval() {
base::Time now = base::Time::Now();
if (last_fired_.is_null()) {
// The first time we call CheckInterval, we read the time stored in prefs.
last_fired_ = base::Time::FromInternalValue(
pref_service_->GetInt64(pref_name_));
DVLOG(1) << "DailyEvent time loaded: "
<< base::TimeFormatShortDateAndTime(last_fired_);
if (last_fired_.is_null()) {
DVLOG(1) << "DailyEvent first run.";
RecordIntervalTypeHistogram(pref_name_, FIRST_RUN);
OnInterval(now);
return;
}
}
int days_elapsed = (now - last_fired_).InDays();
if (days_elapsed >= 1) {
DVLOG(1) << "DailyEvent day elapsed.";
RecordIntervalTypeHistogram(pref_name_, DAY_ELAPSED);
OnInterval(now);
} else if (days_elapsed <= -1) {
// The "last fired" time is more than a day in the future, so the clock
// must have been changed.
DVLOG(1) << "DailyEvent clock change detected.";
RecordIntervalTypeHistogram(pref_name_, CLOCK_CHANGED);
OnInterval(now);
}
}
void DailyEvent::OnInterval(base::Time now) {
DCHECK(!now.is_null());
last_fired_ = now;
pref_service_->SetInt64(pref_name_, last_fired_.ToInternalValue());
// Notify all observers
for (ScopedVector<DailyEvent::Observer>::iterator it = observers_.begin();
it != observers_.end();
++it) {
(*it)->OnDailyEvent();
}
}
} // namespace metrics
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