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72 wiersze
1.4 KiB
72 wiersze
1.4 KiB
#pragma once
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#include "db/dbformat.h"
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#include <cstddef>
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#include <cstdint>
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#include "leveldb/env.h"
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#include "leveldb/slice.h"
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#include "leveldb/status.h"
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#include "leveldb/write_batch.h"
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namespace leveldb {
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struct FilePointer {
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uint64_t FileNumber;
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uint64_t FileOffset;
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uint64_t Size;
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};
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void EncodeFP(const struct FilePointer &fp,char *scratch);
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void DecodeFp(struct FilePointer &fp, char *src);
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class KVLog {
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public:
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explicit KVLog(WritableFile *dest,uint64_t file_number);
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KVLog(WritableFile *dest, uint64_t dest_length,uint64_t file_number);
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KVLog(const KVLog&) = delete;
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KVLog& operator=(const KVLog&) = delete;
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~KVLog() = default;
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Status AddRecord(const Slice& slice,FilePointer &fp);
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private:
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WritableFile* dest_;
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uint64_t pos_;
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uint64_t file_number;
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char buf[8];
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};
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class KVLogReader {
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public:
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KVLogReader(SequentialFile *file):file(file),rep_(nullptr),rep_size(0),valid(true)
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{ Next();};
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~KVLogReader() {
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delete rep_;
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}
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ValueType Type() {return type;}
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Slice Key() {return key;}
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Slice Value() {return value;}
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SequenceNumber Seq() {return seq;}
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bool Valid() {return valid;}
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void Next();
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private:
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void NextWriteBatch();
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void NextKV();
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private:
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Slice key;
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Slice value;
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SequenceNumber seq;
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ValueType type;
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bool valid;
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SequentialFile *file;
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Slice input;
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uint64_t rep_size;
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char *rep_;
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char number[8];
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};
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}
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