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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_USER_TUNING_TAB_REVISIT_TRACKER_H_
#define COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_USER_TUNING_TAB_REVISIT_TRACKER_H_
#include <map>
#include <optional>
#include "base/time/time.h"
#include "components/performance_manager/public/decorators/page_live_state_decorator.h"
#include "components/performance_manager/public/decorators/tab_page_decorator.h"
#include "components/performance_manager/public/graph/graph.h"
#include "components/performance_manager/public/graph/graph_registered.h"
namespace performance_manager {
// A GraphOwned object that tracks tab transitions to/from
// active/background/closed/discarded states and records timing information
// about these states.
class TabRevisitTracker : public TabPageObserver,
public PageLiveStateObserver,
public PageNodeObserver,
public GraphOwnedAndRegistered<TabRevisitTracker> {
public:
static constexpr char kTimeToRevisitHistogramName[] =
"PerformanceManager.TabRevisitTracker.TimeToRevisit2";
static constexpr char kTimeToCloseHistogramName[] =
"PerformanceManager.TabRevisitTracker.TimeToClose2";
static constexpr int64_t kMaxNumRevisit = 20;
TabRevisitTracker();
~TabRevisitTracker() override;
static int64_t ExponentiallyBucketedSeconds(base::TimeDelta time);
enum class State {
// The order of the leading elements must match the one in enums.xml
// `TabRevisitTracker.TabState`.
kActive,
kBackground,
kClosed,
// The following entries aren't present in enums.xml but they are used for
// internal tracking
kDiscarded,
};
struct StateBundle {
State state;
std::optional<base::TimeTicks> last_active_time;
base::TimeDelta total_time_active;
base::TimeTicks last_state_change_time;
int64_t num_revisits;
};
virtual StateBundle GetStateForTabHandle(
const TabPageDecorator::TabHandle* tab_handle);
private:
friend class TabRevisitTrackerTest;
class UkmSourceIdReadyRecorder;
void RecordRevisitHistograms(const TabPageDecorator::TabHandle* tab_handle);
void RecordCloseHistograms(const TabPageDecorator::TabHandle* tab_handle);
void RecordStateChangeUkmAndUpdateStateBundle(
const TabPageDecorator::TabHandle* tab_handle,
StateBundle new_state_bundle);
StateBundle CreateUpdatedStateBundle(
const TabPageDecorator::TabHandle* tab_handle,
State new_state) const;
// GraphOwned:
void OnPassedToGraph(Graph* graph) override;
void OnTakenFromGraph(Graph* graph) override;
// TabPageObserver:
void OnTabAdded(TabPageDecorator::TabHandle* tab_handle) override;
void OnTabAboutToBeDiscarded(
const PageNode* old_page_node,
TabPageDecorator::TabHandle* tab_handle) override;
void OnBeforeTabRemoved(TabPageDecorator::TabHandle* tab_handle) override;
// PageLiveStateObserver:
void OnIsActiveTabChanged(const PageNode* page_node) override;
// PageNodeObserver:
void OnUkmSourceIdChanged(const PageNode* page_node) override;
std::map<const TabPageDecorator::TabHandle*, StateBundle> tab_states_;
std::map<const TabPageDecorator::TabHandle*,
std::unique_ptr<UkmSourceIdReadyRecorder>>
pending_ukm_records_;
};
} // namespace performance_manager
#endif // COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_USER_TUNING_TAB_REVISIT_TRACKER_H_
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