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// Copyright 2018 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 "third_party/blink/renderer/platform/ukm_time_aggregator.h"
#include "services/metrics/public/cpp/ukm_entry_builder.h"
#include "services/metrics/public/cpp/ukm_recorder.h"
#include "third_party/blink/renderer/platform/histogram.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "third_party/blink/renderer/platform/wtf/time.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
UkmTimeAggregator::ScopedUkmTimer::ScopedUkmTimer(
UkmTimeAggregator* aggregator,
size_t metric_index,
CustomCountHistogram* histogram_counter)
: aggregator_(aggregator),
metric_index_(metric_index),
histogram_counter_(histogram_counter),
start_time_(CurrentTimeTicks()) {}
UkmTimeAggregator::ScopedUkmTimer::ScopedUkmTimer(ScopedUkmTimer&& other)
: aggregator_(other.aggregator_),
metric_index_(other.metric_index_),
histogram_counter_(other.histogram_counter_),
start_time_(other.start_time_) {
other.aggregator_ = nullptr;
}
UkmTimeAggregator::ScopedUkmTimer::~ScopedUkmTimer() {
if (aggregator_) {
aggregator_->RecordSample(metric_index_, start_time_, CurrentTimeTicks(),
histogram_counter_);
}
}
UkmTimeAggregator::UkmTimeAggregator(String event_name,
int64_t source_id,
ukm::UkmRecorder* recorder,
const Vector<String>& metric_names,
TimeDelta event_frequency)
: event_name_(std::move(event_name)),
source_id_(source_id),
recorder_(recorder),
event_frequency_(event_frequency),
last_flushed_time_(CurrentTimeTicks()) {
metric_records_.ReserveCapacity(metric_names.size());
for (const auto& metric_name : metric_names) {
auto& record = metric_records_.emplace_back();
record.worst_case_metric_name = metric_name;
record.worst_case_metric_name.append(".WorstCase");
record.average_metric_name = metric_name;
record.average_metric_name.append(".Average");
}
}
UkmTimeAggregator::~UkmTimeAggregator() {
Flush(TimeTicks());
}
UkmTimeAggregator::ScopedUkmTimer UkmTimeAggregator::GetScopedTimer(
size_t metric_index,
CustomCountHistogram* histogram_counter) {
return ScopedUkmTimer(this, metric_index, histogram_counter);
}
void UkmTimeAggregator::RecordSample(size_t metric_index,
TimeTicks start,
TimeTicks end,
CustomCountHistogram* histogram_counter) {
FlushIfNeeded(end);
// Record the UMA if we have a counter.
TimeDelta duration = end - start;
if (histogram_counter)
histogram_counter->CountMicroseconds(duration);
// Append the duration to the appropriate metrics record.
DCHECK_LT(metric_index, metric_records_.size());
auto& record = metric_records_[metric_index];
if (duration > record.worst_case_duration)
record.worst_case_duration = duration;
record.total_duration += duration;
++record.sample_count;
has_data_ = true;
}
void UkmTimeAggregator::FlushIfNeeded(TimeTicks current_time) {
if (current_time >= last_flushed_time_ + event_frequency_)
Flush(current_time);
}
void UkmTimeAggregator::Flush(TimeTicks current_time) {
last_flushed_time_ = current_time;
if (!has_data_)
return;
ukm::UkmEntryBuilder builder(source_id_, event_name_.Utf8().data());
for (auto& record : metric_records_) {
if (record.sample_count == 0)
continue;
builder.SetMetric(record.worst_case_metric_name.Utf8().data(),
record.worst_case_duration.InMicroseconds());
builder.SetMetric(record.average_metric_name.Utf8().data(),
record.total_duration.InMicroseconds() /
static_cast<int64_t>(record.sample_count));
record.reset();
}
builder.Record(recorder_);
has_data_ = false;
}
} // namespace blink
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