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79 строки
2.4 KiB
79 строки
2.4 KiB
#ifndef NEWDB_H
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#define NEWDB_H
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#include <memory>
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#include <unordered_set>
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#include <mutex>
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#include <thread>
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#include "leveldb/db.h"
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#include "db/log_writer.h"
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namespace leveldb{
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class LEVELDB_EXPORT NewDB {
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public:
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NewDB() = default;
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NewDB(const NewDB&) = delete;
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NewDB& operator=(const NewDB&) = delete;
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virtual ~NewDB();
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std::string SerializeValue(const FieldArray& fields);
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FieldArray ParseValue(const std::string& value_str);
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std::string ConstructIndexKey(const Slice& key, const Field& field);
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std::string ExtractIndexKey(const Slice& key);
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std::string ConstructRecoverKey(std::string UserOpID, std::string TinyOpID, std::string DBname);
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std::string ConstructRecoverValue(std::string TinyOp, std::string key, std::string value);
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std::string ExtractRecoverKey(std::string s);
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std::pair<std::string, std::string> ExtractRecoverValue(std::string s, std::string* TinyOp);
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std::string ConstructUserOpID(std::thread::id thread_id);
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static Status Open(const Options& options, const std::string& name,
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NewDB** dbptr); // 改为返回 NewDB* 类型-橙
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Status Put_fields(const WriteOptions& options, const Slice& key,
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const FieldArray& fields);
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std::pair<FieldArray, FieldArray> UpdateIndex(const WriteOptions& options, const Slice& key,
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const FieldArray& fields, const FieldArray& current_fields);
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Status Get_fields(const ReadOptions& options, const Slice& key,
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FieldArray* fields);
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bool Delete(const WriteOptions& options, const Slice& key);
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std::vector<std::string> FindKeysByField(Field &field);
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// std::string ConstructKey(const Slice& key, const Field& field);
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// std::string ExtractKey(const Slice& key);
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bool CreateIndexOnField(const std::string& field_name);
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std::vector<std::string> QueryByIndex(Field &field);
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bool DeleteIndex(const std::string& field_name);
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// 用于存储已经为其创建索引的字段名称。只有当字段名在这个集合中时，才会在 indexDB 中插入对应的索引条目。
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std::unordered_set<std::string> indexed_fields_read;
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std::unordered_set<std::string> indexed_fields_write;
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std::unordered_set<std::string> putting_keys;
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private:
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std::unique_ptr<DB> data_db_;
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std::unique_ptr<DB> index_db_;
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std::unique_ptr<DB> recover_db_;
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std::mutex db_mutex_; // 用于跨数据库操作的互斥锁
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uint64_t TinyOpID;
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};
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}
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#endif
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