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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_COMPONENTS_LOCAL_SEARCH_SERVICE_INVERTED_INDEX_SEARCH_H_
#define CHROMEOS_ASH_COMPONENTS_LOCAL_SEARCH_SERVICE_INVERTED_INDEX_SEARCH_H_
#include <cstdint>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "chromeos/ash/components/local_search_service/index.h"
#include "chromeos/ash/components/local_search_service/shared_structs.h"
namespace ash::local_search_service {
class InvertedIndex;
// An implementation of Index.
// A search via the inverted index backend with TF-IDF based document ranking.
class InvertedIndexSearch : public Index {
public:
explicit InvertedIndexSearch(IndexId index_id);
~InvertedIndexSearch() override;
InvertedIndexSearch(const InvertedIndexSearch&) = delete;
InvertedIndexSearch& operator=(const InvertedIndexSearch&) = delete;
// Index overrides:
// GetSize is only accurate if the index has done updating.
void GetSize(GetSizeCallback callback) override;
void AddOrUpdate(const std::vector<Data>& data,
AddOrUpdateCallback callback) override;
void Delete(const std::vector<std::string>& ids,
DeleteCallback callback) override;
void UpdateDocuments(const std::vector<Data>& data,
UpdateDocumentsCallback callback) override;
void Find(const std::u16string& query,
uint32_t max_results,
FindCallback callback) override;
void ClearIndex(ClearIndexCallback callback) override;
uint32_t GetIndexSize() const override;
// Returns document id and number of occurrences of |term|.
// Document ids are sorted in alphabetical order.
std::vector<std::pair<std::string, uint32_t>> FindTermForTesting(
const std::u16string& term) const;
private:
void FinalizeAddOrUpdate(
AddOrUpdateCallback callback,
const std::vector<std::pair<std::string, std::vector<Token>>>& documents);
// FinalizeDelete is called if Delete cannot be immediately done because
// there's another index updating operation before it, i.e.
// |num_queued_index_updates_| is not zero.
void FinalizeDelete(DeleteCallback callback,
const std::vector<std::string>& ids);
void FinalizeUpdateDocuments(
UpdateDocumentsCallback callback,
const std::vector<std::pair<std::string, std::vector<Token>>>& documents);
std::unique_ptr<InvertedIndex> inverted_index_;
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<InvertedIndexSearch> weak_ptr_factory_{this};
};
} // namespace ash::local_search_service
#endif // CHROMEOS_ASH_COMPONENTS_LOCAL_SEARCH_SERVICE_INVERTED_INDEX_SEARCH_H_
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