| // 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_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_ = NULL; |
| |
| 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 |