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// Copyright 2014 The Chromium Authors
// 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 <memory>
#include <utility>
#include "base/logging.h"
#include "base/metrics/histogram_functions.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service.h"
namespace metrics {
namespace {
class CallbackObserver : public DailyEvent::Observer {
public:
explicit CallbackObserver(base::RepeatingClosure closure)
: closure_(std::move(closure)) {}
~CallbackObserver() override = default;
CallbackObserver(const CallbackObserver&) = delete;
CallbackObserver& operator=(const CallbackObserver&) = delete;
void OnDailyEvent(DailyEvent::IntervalType _) override { closure_.Run(); }
private:
base::RepeatingClosure closure_;
};
void RecordIntervalTypeHistogram(const std::string& histogram_name,
DailyEvent::IntervalType type) {
if (histogram_name.empty()) {
return;
}
base::UmaHistogramEnumeration(histogram_name, type);
}
} // namespace
DailyEvent::Observer::Observer() = default;
DailyEvent::Observer::~Observer() = default;
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() = default;
// static
void DailyEvent::RegisterPref(PrefRegistrySimple* registry,
const std::string& pref_name) {
registry->RegisterInt64Pref(pref_name, 0);
}
void DailyEvent::AddObserver(std::unique_ptr<DailyEvent::Observer> observer) {
DVLOG(2) << "DailyEvent observer added.";
DCHECK(last_fired_.is_null());
observers_.push_back(std::move(observer));
}
void DailyEvent::AddObserverClosure(base::RepeatingClosure closure) {
AddObserver(std::make_unique<CallbackObserver>(std::move(closure)));
}
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() + base::Microseconds(pref_service_->GetInt64(pref_name_));
DVLOG(1) << "DailyEvent time loaded: " << last_fired_;
if (last_fired_.is_null()) {
DVLOG(1) << "DailyEvent first run.";
RecordIntervalTypeHistogram(histogram_name_, IntervalType::FIRST_RUN);
OnInterval(now, IntervalType::FIRST_RUN);
return;
}
}
int days_elapsed = (now - last_fired_).InDays();
if (days_elapsed >= 1) {
DVLOG(1) << "DailyEvent day elapsed.";
RecordIntervalTypeHistogram(histogram_name_, IntervalType::DAY_ELAPSED);
OnInterval(now, IntervalType::DAY_ELAPSED);
} 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(histogram_name_, IntervalType::CLOCK_CHANGED);
OnInterval(now, IntervalType::CLOCK_CHANGED);
}
}
void DailyEvent::OnInterval(base::Time now, IntervalType type) {
DCHECK(!now.is_null());
last_fired_ = now;
pref_service_->SetInt64(pref_name_,
last_fired_.since_origin().InMicroseconds());
for (auto it = observers_.begin(); it != observers_.end(); ++it) {
(*it)->OnDailyEvent(type);
}
}
} // namespace metrics
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