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// Copyright 2022 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_DATABASE_SEGMENT_INFO_CACHE_H_
#define COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_DATABASE_SEGMENT_INFO_CACHE_H_
#include <memory>
#include <optional>
#include "base/containers/flat_map.h"
#include "base/containers/flat_set.h"
#include "base/functional/callback.h"
#include "components/segmentation_platform/internal/proto/model_prediction.pb.h"
#include "components/segmentation_platform/public/proto/model_metadata.pb.h"
#include "components/segmentation_platform/public/proto/segmentation_platform.pb.h"
namespace segmentation_platform {
using proto::ModelSource;
using proto::SegmentId;
using proto::SegmentInfo;
// Represents a cache layer wrapped over the DB layer that stores
// used SegmentId and SegmentInfo to be cached, inorder to decrease
// the time to read from DB in consecutive calls
class SegmentInfoCache {
public:
using SegmentInfoList =
std::vector<std::pair<SegmentId, const proto::SegmentInfo*>>;
SegmentInfoCache();
~SegmentInfoCache();
// Disallow copy/assign.
SegmentInfoCache(const SegmentInfoCache&) = delete;
SegmentInfoCache& operator=(const SegmentInfoCache&) = delete;
// Returns an optional SegmentInfo for a `segment_id` based on `model_source`.
const SegmentInfo* GetSegmentInfo(SegmentId segment_id,
ModelSource model_source) const;
// Returns list of segment info for list of `segment_ids` found in the cache
// based on `model_source`. If segment info is not found for a segment id,
// nothing is returned for it.
std::unique_ptr<SegmentInfoList> GetSegmentInfoForSegments(
const base::flat_set<SegmentId>& segment_ids,
ModelSource model_source) const;
// Returns list of segment info for list of `segment_ids` found in the cache
// for both server and default model segments. If segment info is not found
// for a segment id, nothing is returned for it.
std::unique_ptr<SegmentInfoList> GetSegmentInfoForBothModels(
const base::flat_set<SegmentId>& segment_ids) const;
// Updates cache with `segment_info` for a `segment_id` based on
// `model_source`. It deletes the entry in cache if `segment_info` is nullopt.
void UpdateSegmentInfo(SegmentId segment_id,
ModelSource model_source,
std::optional<SegmentInfo> segment_info);
private:
// Map storing SegmentInfo for a SegmentId and ModelSource.
base::flat_map<std::pair<SegmentId, ModelSource>, SegmentInfo>
segment_info_cache_;
};
} // namespace segmentation_platform
#endif // COMPONENTS_SEGMENTATION_PLATFORM_INTERNAL_DATABASE_SEGMENT_INFO_CACHE_H_
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