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rocksdb/db/transaction_log_iterator_im...

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// Copyright 2008-present Facebook. All Rights Reserved.
#ifndef STORAGE_LEVELDB_INCLUDE_WRITES_ITERATOR_IMPL_H_
#define STORAGE_LEVELDB_INCLUDE_WRITES_ITERATOR_IMPL_H_
#include <vector>
#include "leveldb/env.h"
#include "leveldb/options.h"
#include "leveldb/types.h"
#include "leveldb/transaction_log_iterator.h"
#include "db/log_file.h"
#include "db/log_reader.h"
#include "util/storage_options.h"
namespace leveldb {
struct LogReporter : public log::Reader::Reporter {
Env* env;
Logger* info_log;
uint64_t log_number;
virtual void Corruption(size_t bytes, const Status& s) {
Log(info_log, "%ld: dropping %d bytes; %s",
log_number, static_cast<int>(bytes), s.ToString().c_str());
}
};
class TransactionLogIteratorImpl : public TransactionLogIterator {
public:
TransactionLogIteratorImpl(const std::string& dbname,
const Options* options,
const StorageOptions& soptions,
SequenceNumber& seqNum,
std::unique_ptr<std::vector<LogFile>> files,
SequenceNumber const * const lastFlushedSequence);
virtual bool Valid();
virtual void Next();
virtual Status status();
virtual BatchResult GetBatch();
private:
const std::string& dbname_;
const Options* options_;
const StorageOptions& soptions_;
const uint64_t startingSequenceNumber_;
std::unique_ptr<std::vector<LogFile>> files_;
bool started_;
bool isValid_; // not valid when it starts of.
Status currentStatus_;
size_t currentFileIndex_;
std::unique_ptr<WriteBatch> currentBatch_;
unique_ptr<log::Reader> currentLogReader_;
Status OpenLogFile(const LogFile& logFile, unique_ptr<SequentialFile>* file);
LogReporter NewLogReporter(uint64_t logNumber);
SequenceNumber const * const lastFlushedSequence_;
// represents the sequence number being read currently.
SequenceNumber currentSequence_;
void UpdateCurrentWriteBatch(const Slice& record);
Status OpenLogReader(const LogFile& file);
};
} // namespace leveldb
#endif // STORAGE_LEVELDB_INCLUDE_WRITES_ITERATOR_IMPL_H_