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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/resource_coordinator/discard_metrics_lifecycle_unit_observer.h"
#include "base/check.h"
#include "base/metrics/histogram_functions.h"
#include "base/metrics/histogram_macros.h"
#include "base/notreached.h"
#include "base/strings/string_util.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/resource_coordinator/lifecycle_unit.h"
#include "chrome/browser/resource_coordinator/time.h"
namespace resource_coordinator {
DiscardMetricsLifecycleUnitObserver::DiscardMetricsLifecycleUnitObserver() =
default;
DiscardMetricsLifecycleUnitObserver::~DiscardMetricsLifecycleUnitObserver() =
default;
void DiscardMetricsLifecycleUnitObserver::OnLifecycleUnitStateChanged(
LifecycleUnit* lifecycle_unit,
LifecycleUnitState last_state,
LifecycleUnitStateChangeReason reason) {
if (lifecycle_unit->GetState() == LifecycleUnitState::DISCARDED)
OnDiscard(lifecycle_unit, reason);
else if (last_state == LifecycleUnitState::DISCARDED)
OnReload();
}
void DiscardMetricsLifecycleUnitObserver::OnLifecycleUnitDestroyed(
LifecycleUnit* lifecycle_unit) {
// If the browser is not shutting down and the tab is loaded after
// being discarded, record TabManager.Discarding.ReloadToCloseTime.
if (g_browser_process && !g_browser_process->IsShuttingDown() &&
lifecycle_unit->GetState() != LifecycleUnitState::DISCARDED &&
!reload_time_.is_null()) {
auto reload_to_close_time = NowTicks() - reload_time_;
UMA_HISTOGRAM_CUSTOM_TIMES("TabManager.Discarding.ReloadToCloseTime",
reload_to_close_time, base::Seconds(1),
base::Days(1), 100);
}
// This is a self-owned object that destroys itself with the LifecycleUnit
// that it observes.
lifecycle_unit->RemoveObserver(this);
delete this;
}
void DiscardMetricsLifecycleUnitObserver::OnDiscard(
LifecycleUnit* lifecycle_unit,
LifecycleUnitStateChangeReason reason) {
discard_time_ = NowTicks();
discard_reason_ = reason;
last_focused_time_before_discard_ = lifecycle_unit->GetLastFocusedTimeTicks();
static int discard_count = 0;
UMA_HISTOGRAM_CUSTOM_COUNTS("TabManager.Discarding.DiscardCount",
++discard_count, 1, 1000, 50);
}
void DiscardMetricsLifecycleUnitObserver::OnReload() {
DCHECK(!discard_time_.is_null());
reload_time_ = NowTicks();
static int reload_count = 0;
UMA_HISTOGRAM_CUSTOM_COUNTS("TabManager.Discarding.ReloadCount",
++reload_count, 1, 1000, 50);
auto discard_to_reload_time = reload_time_ - discard_time_;
UMA_HISTOGRAM_CUSTOM_TIMES("TabManager.Discarding.DiscardToReloadTime",
discard_to_reload_time, base::Seconds(1),
base::Days(1), 100);
auto inactive_to_reload_time =
reload_time_ - last_focused_time_before_discard_;
UMA_HISTOGRAM_CUSTOM_TIMES("TabManager.Discarding.InactiveToReloadTime",
inactive_to_reload_time, base::Seconds(1),
base::Days(1), 100);
if (discard_reason_ == LifecycleUnitStateChangeReason::BROWSER_INITIATED) {
UMA_HISTOGRAM_CUSTOM_TIMES(
"TabManager.Discarding.DiscardToReloadTime.Proactive",
discard_to_reload_time, base::Seconds(1), base::Days(1), 100);
UMA_HISTOGRAM_CUSTOM_TIMES(
"TabManager.Discarding.InactiveToReloadTime.Proactive",
inactive_to_reload_time, base::Seconds(1), base::Days(1), 100);
}
}
} // namespace resource_coordinator
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