Added a timer-based report to the metrics library.
Timer encapsulates a timer with basic functionality.
TimerReporter subclasses it for also sending UMA reports.
BUG=chromium-os:18800
TEST=Unit test 'timer_test' has been included
Change-Id: I9de9a2a7388721ba1476fe706a8d12788d2176ad
Reviewed-on: http://gerrit.chromium.org/gerrit/5161
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Bruno Pontes Soares Rocha <bpontes@google.com>
Reviewed-by: Bruno Pontes Soares Rocha <bpontes@google.com>
diff --git a/metrics/timer.cc b/metrics/timer.cc
new file mode 100644
index 0000000..67b0fd1
--- /dev/null
+++ b/metrics/timer.cc
@@ -0,0 +1,77 @@
+// 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 <base/time.h>
+
+#include "metrics_library.h"
+
+namespace chromeos_metrics {
+
+base::TimeTicks ClockWrapper::GetCurrentTime() const {
+ return base::TimeTicks::Now();
+}
+
+Timer::Timer()
+ : is_started_(false),
+ clock_wrapper_(new ClockWrapper()) {}
+
+bool Timer::Start() {
+ start_time_ = clock_wrapper_->GetCurrentTime();
+ is_started_ = true;
+ return true;
+}
+
+bool Timer::Stop() {
+ // Check if the timer has been started.
+ if (!is_started_) return false;
+ is_started_ = false;
+ elapsed_time_ = clock_wrapper_->GetCurrentTime() - start_time_;
+ return true;
+}
+
+bool Timer::Reset() {
+ is_started_ = false;
+ return true;
+}
+
+bool Timer::HasStarted() const {
+ return is_started_;
+}
+
+bool Timer::GetElapsedTime(base::TimeDelta* elapsed_time) const {
+ if (start_time_.is_null() || !elapsed_time) return false;
+ if (is_started_) {
+ *elapsed_time = clock_wrapper_->GetCurrentTime() - start_time_;
+ } else {
+ *elapsed_time = elapsed_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