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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/test/logging_timer.h"
#include <map>
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/time/tick_clock.h"
namespace extensions {
namespace {
const base::TickClock* g_clock_for_testing = nullptr;
// A global record of all tracked times.
class TimeTracker {
public:
TimeTracker() = default;
TimeTracker(const TimeTracker&) = delete;
TimeTracker& operator=(const TimeTracker&) = delete;
~TimeTracker() = default;
void IncrementTime(const char* key, base::TimeDelta elapsed) {
auto& data = tracked_times_[key];
data.total_time += elapsed;
data.num_samples++;
}
base::TimeDelta GetTrackedTime(const char* key) {
auto iter = tracked_times_.find(key);
return iter != tracked_times_.end() ? iter->second.total_time
: base::TimeDelta();
}
void Print() {
for (const auto& key_value : tracked_times_) {
LOG(WARNING) << "\n"
<< key_value.first << ":"
<< "\n total: " << key_value.second.total_time
<< "\n average: " << key_value.second.average_time();
}
}
private:
struct Data {
base::TimeDelta total_time;
size_t num_samples = 0u;
base::TimeDelta average_time() const {
return num_samples == 0u ? base::TimeDelta() : total_time / num_samples;
}
};
// NOTE(devlin): If we find that these map lookups are too expensive, we
// could instead use a c-style array similar to RuntimeCallStats.
std::map<const char*, Data> tracked_times_;
};
base::TimeTicks GetNow() {
return g_clock_for_testing ? g_clock_for_testing->NowTicks()
: base::TimeTicks::Now();
}
TimeTracker& GetTimeTracker() {
static TimeTracker time_tracker;
return time_tracker;
}
} // namespace
LoggingTimer::LoggingTimer(const char* key) : start_(GetNow()), key_(key) {}
LoggingTimer::~LoggingTimer() {
GetTimeTracker().IncrementTime(key_, GetNow() - start_);
}
// static
base::TimeDelta LoggingTimer::GetTrackedTime(const char* key) {
return GetTimeTracker().GetTrackedTime(key);
}
// static
void LoggingTimer::Print() {
GetTimeTracker().Print();
}
// static
void LoggingTimer::set_clock_for_testing(const base::TickClock* clock) {
g_clock_for_testing = clock;
}
} // namespace extensions
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