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// Copyright 2021 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_SEGMENTATION_PLATFORM_INTERNAL_SELECTION_SEGMENTATION_RESULT_PREFS_H_
#define COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_SELECTION_SEGMENTATION_RESULT_PREFS_H_
#include <optional>
#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "components/segmentation_platform/public/proto/segmentation_platform.pb.h"
class PrefService;
namespace segmentation_platform {
using proto::SegmentId;
// Struct containing information about the selected segment. Convenient for
// reading and writing to prefs.
struct SelectedSegment {
public:
SelectedSegment(SegmentId segment_id, std::optional<float> rank);
~SelectedSegment();
// The segment selection result.
SegmentId segment_id;
// The discrete score computed based on the `segment_id` model execution. If a
// discrete mapping is not provided, the value will be equal to the model
// score. Otherwise the value will be the mapped score based on the mapping.
// May not be available in prefs for versions older than M107.
std::optional<float> rank;
// The time when the segment was selected.
base::Time selection_time;
// Whether or not the segment selection result is in use.
bool in_use;
};
// Stores the result of segmentation into prefs for faster lookup. The result
// consists of (1) The selected segment ID. (2) The time when the segment was
// first selected. Used to enforce segment selection TTL. (3) Whether the
// selected segment has started to be used by clients.
class SegmentationResultPrefs {
public:
explicit SegmentationResultPrefs(PrefService* pref_service);
virtual ~SegmentationResultPrefs() = default;
// Disallow copy/assign.
SegmentationResultPrefs(const SegmentationResultPrefs& other) = delete;
SegmentationResultPrefs operator=(const SegmentationResultPrefs& other) =
delete;
// Writes the selected segment to prefs. Deletes the previous results if
// |selected_segment| is empty.
virtual void SaveSegmentationResultToPref(
const std::string& result_key,
const std::optional<SelectedSegment>& selected_segment);
// Reads the selected segment from pref, if any.
virtual std::optional<SelectedSegment> ReadSegmentationResultFromPref(
const std::string& result_key);
private:
raw_ptr<PrefService> prefs_;
};
} // namespace segmentation_platform
#endif // COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_SELECTION_SEGMENTATION_RESULT_PREFS_H_
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