25개 이상의 토픽을 선택하실 수 없습니다.
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
1.5 KiB
56 lines
1.5 KiB
#pragma once
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#include <cstdint>
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#include <cstdio>
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#include "leveldb/slice.h"
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#include "leveldb/write_batch.h"
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#include "util/serialize_value.h"
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#include "fielddb/field_db.h"
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namespace fielddb {
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using namespace leveldb;
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/*根据写入的流程可以推断，需要存在metaDB中的数据其实都是带索引的数据,也就是FieldArray*/
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// class MetaKV {
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// MetaKV(Slice &Key,FieldArray Fields):
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// Key(Key),Fields(Fields),tag(0),meta_seq(0) { }
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// inline int get_seq() { return meta_seq; }
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// inline void set_seq(int meta_seq) { this->meta_seq = meta_seq; }
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// inline void setPut() { tag = PUT; }
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// inline void setDelete() { tag = DELETE; }
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// Slice metaKey();
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// Slice metaValue();
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// private:
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// enum {PUT = 0x0,DELETE = 0x1};
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// uint64_t meta_seq;
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// uint8_t tag;
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// Slice &Key;
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// FieldArray Fields;
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// };
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enum MetaType {
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//Index, //记录index状态的meta
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KV_Creating, //记录含有index field的put的meta
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KV_Deleting,
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};
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//将一对(field_name,field_value)转换到metaDB中的KV表示
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class MetaKV {
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public:
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MetaKV(Slice field_name,Slice field_value = Slice()):
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name(field_name),value(field_value) { }
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void TransPut(std::string &MetaKey,std::string &MetaValue);
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void TransDelete(std::string &MetaKey);
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private:
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Slice name;
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Slice value;
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};
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class MetaCleaner {
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public:
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MetaCleaner() = default;
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void Collect(WriteBatch &MetaBatch);
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void CleanMetaBatch(DB *metaDB);
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private:
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WriteBatch NeedClean;
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};
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}
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