97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
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// Copyright 2014 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "components/metrics/daily_event.h"
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#include <utility>
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#include "base/logging.h"
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#include "base/metrics/histogram_functions.h"
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#include "components/prefs/pref_registry_simple.h"
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#include "components/prefs/pref_service.h"
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namespace metrics {
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namespace {
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void RecordIntervalTypeHistogram(const std::string& histogram_name,
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DailyEvent::IntervalType type) {
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if (histogram_name.empty())
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return;
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base::UmaHistogramEnumeration(histogram_name, type);
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}
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} // namespace
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DailyEvent::Observer::Observer() {
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}
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DailyEvent::Observer::~Observer() {
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}
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DailyEvent::DailyEvent(PrefService* pref_service,
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const char* pref_name,
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const std::string& histogram_name)
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: pref_service_(pref_service),
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pref_name_(pref_name),
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histogram_name_(histogram_name) {
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}
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DailyEvent::~DailyEvent() {
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}
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// static
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void DailyEvent::RegisterPref(PrefRegistrySimple* registry,
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const std::string& pref_name) {
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registry->RegisterInt64Pref(pref_name, 0);
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}
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void DailyEvent::AddObserver(std::unique_ptr<DailyEvent::Observer> observer) {
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DVLOG(2) << "DailyEvent observer added.";
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DCHECK(last_fired_.is_null());
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observers_.push_back(std::move(observer));
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}
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void DailyEvent::CheckInterval() {
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base::Time now = base::Time::Now();
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if (last_fired_.is_null()) {
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// The first time we call CheckInterval, we read the time stored in prefs.
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last_fired_ =
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base::Time() + base::Microseconds(pref_service_->GetInt64(pref_name_));
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DVLOG(1) << "DailyEvent time loaded: " << last_fired_;
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if (last_fired_.is_null()) {
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DVLOG(1) << "DailyEvent first run.";
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RecordIntervalTypeHistogram(histogram_name_, IntervalType::FIRST_RUN);
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OnInterval(now, IntervalType::FIRST_RUN);
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return;
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}
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}
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int days_elapsed = (now - last_fired_).InDays();
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if (days_elapsed >= 1) {
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DVLOG(1) << "DailyEvent day elapsed.";
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RecordIntervalTypeHistogram(histogram_name_, IntervalType::DAY_ELAPSED);
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OnInterval(now, IntervalType::DAY_ELAPSED);
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} else if (days_elapsed <= -1) {
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// The "last fired" time is more than a day in the future, so the clock
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// must have been changed.
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DVLOG(1) << "DailyEvent clock change detected.";
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RecordIntervalTypeHistogram(histogram_name_, IntervalType::CLOCK_CHANGED);
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OnInterval(now, IntervalType::CLOCK_CHANGED);
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}
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}
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void DailyEvent::OnInterval(base::Time now, IntervalType type) {
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DCHECK(!now.is_null());
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last_fired_ = now;
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pref_service_->SetInt64(pref_name_,
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last_fired_.since_origin().InMicroseconds());
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for (auto it = observers_.begin(); it != observers_.end(); ++it) {
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(*it)->OnDailyEvent(type);
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}
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}
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} // namespace metrics
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