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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/metrics/task_switch_metrics_recorder.h"
#include <memory>
#include "ash/metrics/task_switch_time_tracker.h"
#include "base/check_op.h"
#include "base/containers/contains.h"
#include "base/notreached.h"
namespace ash {
namespace {
const char kAcceleratorWindowCycleHistogramName[] =
"Ash.WindowCycleController.TimeBetweenTaskSwitches";
const char kOverviewModeHistogramName[] =
"Ash.Overview.TimeBetweenActiveWindowChanges";
// Returns the histogram name for the given |task_switch_source|.
const char* GetHistogramName(TaskSwitchSource task_switch_source) {
switch (task_switch_source) {
case TaskSwitchSource::OVERVIEW_MODE:
return kOverviewModeHistogramName;
case TaskSwitchSource::WINDOW_CYCLE_CONTROLLER:
return kAcceleratorWindowCycleHistogramName;
case TaskSwitchSource::ANY:
case TaskSwitchSource::DESKTOP:
case TaskSwitchSource::SHELF:
return nullptr;
}
NOTREACHED();
}
} // namespace
TaskSwitchMetricsRecorder::TaskSwitchMetricsRecorder() = default;
TaskSwitchMetricsRecorder::~TaskSwitchMetricsRecorder() = default;
void TaskSwitchMetricsRecorder::OnTaskSwitch(
TaskSwitchSource task_switch_source) {
DCHECK_NE(task_switch_source, TaskSwitchSource::ANY);
if (task_switch_source != TaskSwitchSource::ANY) {
OnTaskSwitchInternal(task_switch_source);
OnTaskSwitchInternal(TaskSwitchSource::ANY);
}
}
void TaskSwitchMetricsRecorder::OnTaskSwitchInternal(
TaskSwitchSource task_switch_source) {
TaskSwitchTimeTracker* task_switch_time_tracker =
FindTaskSwitchTimeTracker(task_switch_source);
if (!task_switch_time_tracker)
AddTaskSwitchTimeTracker(task_switch_source);
task_switch_time_tracker = FindTaskSwitchTimeTracker(task_switch_source);
if (task_switch_time_tracker) {
task_switch_time_tracker->OnTaskSwitch();
}
}
TaskSwitchTimeTracker* TaskSwitchMetricsRecorder::FindTaskSwitchTimeTracker(
TaskSwitchSource task_switch_source) {
auto it = histogram_map_.find(static_cast<int>(task_switch_source));
if (it == histogram_map_.end())
return nullptr;
return it->second.get();
}
void TaskSwitchMetricsRecorder::AddTaskSwitchTimeTracker(
TaskSwitchSource task_switch_source) {
CHECK(!base::Contains(histogram_map_, static_cast<int>(task_switch_source)));
const char* histogram_name = GetHistogramName(task_switch_source);
if (histogram_name) {
histogram_map_[static_cast<int>(task_switch_source)] =
std::make_unique<TaskSwitchTimeTracker>(histogram_name);
}
}
} // namespace ash
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