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// Copyright (c) 2011 The Chromium OS 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 "timer.h"
#include <string>
#include <base/memory/scoped_ptr.h>
#include "metrics/metrics_library.h"
namespace chromeos_metrics {
base::TimeTicks ClockWrapper::GetCurrentTime() const {
return base::TimeTicks::Now();
}
Timer::Timer()
: timer_state_(kTimerStopped),
clock_wrapper_(new ClockWrapper()) {}
bool Timer::Start() {
elapsed_time_ = base::TimeDelta(); // Sets elapsed_time_ to zero.
start_time_ = clock_wrapper_->GetCurrentTime();
timer_state_ = kTimerRunning;
return true;
}
bool Timer::Stop() {
if (timer_state_ == kTimerStopped)
return false;
if (timer_state_ == kTimerRunning)
elapsed_time_ += clock_wrapper_->GetCurrentTime() - start_time_;
timer_state_ = kTimerStopped;
return true;
}
bool Timer::Pause() {
switch (timer_state_) {
case kTimerStopped:
if (!Start())
return false;
timer_state_ = kTimerPaused;
return true;
case kTimerRunning:
timer_state_ = kTimerPaused;
elapsed_time_ += clock_wrapper_->GetCurrentTime() - start_time_;
return true;
default:
return false;
}
}
bool Timer::Resume() {
switch (timer_state_) {
case kTimerStopped:
return Start();
case kTimerPaused:
start_time_ = clock_wrapper_->GetCurrentTime();
timer_state_ = kTimerRunning;
return true;
default:
return false;
}
}
bool Timer::Reset() {
elapsed_time_ = base::TimeDelta(); // Sets elapsed_time_ to zero.
timer_state_ = kTimerStopped;
return true;
}
bool Timer::HasStarted() const {
return timer_state_ != kTimerStopped;
}
bool Timer::GetElapsedTime(base::TimeDelta* elapsed_time) const {
if (start_time_.is_null() || !elapsed_time)
return false;
*elapsed_time = elapsed_time_;
if (timer_state_ == kTimerRunning) {
*elapsed_time += clock_wrapper_->GetCurrentTime() - start_time_;
}
return true;
}
// static
MetricsLibraryInterface* TimerReporter::metrics_lib_ = nullptr;
TimerReporter::TimerReporter(const std::string& histogram_name, int min,
int max, int num_buckets)
: histogram_name_(histogram_name),
min_(min),
max_(max),
num_buckets_(num_buckets) {}
bool TimerReporter::ReportMilliseconds() const {
base::TimeDelta elapsed_time;
if (!metrics_lib_ || !GetElapsedTime(&elapsed_time)) return false;
return metrics_lib_->SendToUMA(histogram_name_,
elapsed_time.InMilliseconds(),
min_,
max_,
num_buckets_);
}
} // namespace chromeos_metrics
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