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// Copyright 2013 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 <memory>
#include "ash/ash_export.h"
#include "ash/common/metrics/user_metrics_action.h"
#include "ash/metrics/task_switch_metrics_recorder.h"
#include "base/macros.h"
#include "base/timer/timer.h"
namespace ash {
class DesktopTaskSwitchMetricRecorder;
class PointerMetricsRecorder;
namespace test {
class UserMetricsRecorderTestAPI;
// User Metrics Recorder provides a repeating callback (RecordPeriodicMetrics)
// on a timer to allow recording of state data over time to the UMA records.
// Any additional states (in ash) that require monitoring can be added to
// this class. As well calls to record on action metrics
// (RecordUserMetricsAction) are passed through the UserMetricsRecorder.
class ASH_EXPORT UserMetricsRecorder {
// Creates a UserMetricsRecorder that records metrics periodically. Equivalent
// to calling UserMetricsRecorder(true).
virtual ~UserMetricsRecorder();
// Records an Ash owned user action.
void RecordUserMetricsAction(UserMetricsAction action);
TaskSwitchMetricsRecorder& task_switch_metrics_recorder() {
return task_switch_metrics_recorder_;
// Informs |this| that the Shell has been initialized.
void OnShellInitialized();
// Informs |this| that the Shell is going to be shut down.
void OnShellShuttingDown();
friend class test::UserMetricsRecorderTestAPI;
// Creates a UserMetricsRecorder and will only record periodic metrics if
// |record_periodic_metrics| is true. This is used by tests that do not want
// the timer to be started.
// TODO(bruthig): Add a constructor that accepts a base::RepeatingTimer so
// that tests can inject a test double that can be controlled by the test. The
// missing piece is a suitable base::RepeatingTimer test double.
explicit UserMetricsRecorder(bool record_periodic_metrics);
// Records UMA metrics. Invoked periodically by the |timer_|.
void RecordPeriodicMetrics();
// Returns true if the user's session is active and they are in a desktop
// environment.
bool IsUserInActiveDesktopEnvironment() const;
// Starts the |timer_| and binds it to |RecordPeriodicMetrics|.
void StartTimer();
// The periodic timer that triggers metrics to be recorded.
base::RepeatingTimer timer_;
TaskSwitchMetricsRecorder task_switch_metrics_recorder_;
// Metric recorder to track how often task windows are activated by mouse
// clicks or touchscreen taps.
// Metric recorder to track pointer down events.
std::unique_ptr<PointerMetricsRecorder> pointer_metrics_recorder_;
} // namespace ash