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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/dom/dom_stat_tracker.h"
#include "base/stringprintf.h"
namespace cobalt {
namespace dom {
DomStatTracker::DomStatTracker(const std::string& name)
: total_html_elements_(
StringPrintf("Count.%s.DOM.HtmlElement", name.c_str()), 0,
"Total number of HTML elements."),
is_event_active_(false),
event_video_start_delay_stop_watch_(kStopWatchTypeEventVideoStartDelay,
base::StopWatch::kAutoStartOff, this),
event_video_start_delay_(
StringPrintf("Event.Duration.%s.DOM.VideoStartDelay", name.c_str()),
base::TimeDelta(), "Total delay between event and video starting."),
html_elements_created_count_(0),
html_elements_destroyed_count_(0),
update_matching_rules_count_(0),
update_computed_style_count_(0),
generate_html_element_computed_style_count_(0),
generate_pseudo_element_computed_style_count_(0) {
stop_watch_durations_.resize(kNumStopWatchTypes, base::TimeDelta());
}
DomStatTracker::~DomStatTracker() {
FlushPeriodicTracking();
// Verify that all of the elements were destroyed.
DCHECK_EQ(total_html_elements_, 0);
event_video_start_delay_stop_watch_.Stop();
}
void DomStatTracker::OnStartEvent() {
is_event_active_ = true;
// Flush the periodic tracking prior to starting the event. This ensures that
// an accurate count of the periodic counts is produced during the event.
FlushPeriodicTracking();
// Stop the watch before re-starting it. This ensures that the count is
// zeroed out if it was still running from the prior event (this is a common
// case as most events do not result in a video starting).
event_video_start_delay_stop_watch_.Stop();
event_video_start_delay_stop_watch_.Start();
event_video_start_delay_ = base::TimeDelta();
// Zero out the stop watch durations so that the numbers will only include the
// event.
for (size_t i = 0; i < kNumStopWatchTypes; ++i) {
stop_watch_durations_[i] = base::TimeDelta();
}
}
void DomStatTracker::OnEndEvent() {
is_event_active_ = false;
// Flush the periodic tracking after the event. This updates the cval totals,
// providing an accurate picture of them at the moment the event ends.
FlushPeriodicTracking();
}
void DomStatTracker::OnHtmlVideoElementPlaying() {
if (event_video_start_delay_stop_watch_.IsCounting()) {
event_video_start_delay_stop_watch_.Stop();
event_video_start_delay_ =
stop_watch_durations_[kStopWatchTypeEventVideoStartDelay];
}
}
void DomStatTracker::OnHtmlElementCreated() { ++html_elements_created_count_; }
void DomStatTracker::OnHtmlElementDestroyed() {
++html_elements_destroyed_count_;
}
void DomStatTracker::OnUpdateMatchingRules() { ++update_matching_rules_count_; }
void DomStatTracker::OnUpdateComputedStyle() { ++update_computed_style_count_; }
void DomStatTracker::OnGenerateHtmlElementComputedStyle() {
++generate_html_element_computed_style_count_;
}
void DomStatTracker::OnGeneratePseudoElementComputedStyle() {
++generate_pseudo_element_computed_style_count_;
}
base::TimeDelta DomStatTracker::GetStopWatchTypeDuration(
StopWatchType type) const {
return stop_watch_durations_[type];
}
bool DomStatTracker::IsStopWatchEnabled(int id) const {
return is_event_active_ || id == kStopWatchTypeEventVideoStartDelay;
}
void DomStatTracker::OnStopWatchStopped(int id, base::TimeDelta time_elapsed) {
stop_watch_durations_[static_cast<size_t>(id)] += time_elapsed;
}
void DomStatTracker::FlushPeriodicTracking() {
// Update the CVals before clearing the periodic values.
total_html_elements_ +=
html_elements_created_count_ - html_elements_destroyed_count_;
// Now clear the values.
html_elements_created_count_ = 0;
html_elements_destroyed_count_ = 0;
update_matching_rules_count_ = 0;
update_computed_style_count_ = 0;
generate_html_element_computed_style_count_ = 0;
generate_pseudo_element_computed_style_count_ = 0;
}
} // namespace dom
} // namespace cobalt