aa5c897d42
Summary: So that replication can just download from wherever LogFile.Pathname is pointing them. Test Plan: make all check;./db_repl_stress Reviewers: dhruba, haobo Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D12609
104 lines
2.8 KiB
C++
104 lines
2.8 KiB
C++
// Copyright 2008-present Facebook. All Rights Reserved.
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#ifndef STORAGE_LEVELDB_INCLUDE_WRITES_ITERATOR_IMPL_H_
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#define STORAGE_LEVELDB_INCLUDE_WRITES_ITERATOR_IMPL_H_
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#include <vector>
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#include "rocksdb/env.h"
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#include "rocksdb/options.h"
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#include "rocksdb/types.h"
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#include "rocksdb/transaction_log.h"
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#include "db/log_reader.h"
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#include "db/filename.h"
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namespace leveldb {
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struct LogReporter : public log::Reader::Reporter {
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Env* env;
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Logger* info_log;
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virtual void Corruption(size_t bytes, const Status& s) {
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Log(info_log, "dropping %zu bytes; %s", bytes, s.ToString().c_str());
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}
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};
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class LogFileImpl : public LogFile {
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public:
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LogFileImpl(uint64_t logNum, WalFileType logType, SequenceNumber startSeq,
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uint64_t sizeBytes) :
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logNumber_(logNum),
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type_(logType),
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startSequence_(startSeq),
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sizeFileBytes_(sizeBytes) {
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}
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std::string PathName() const {
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if (type_ == kArchivedLogFile) {
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return ArchivedLogFileName("", logNumber_);
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}
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return LogFileName("", logNumber_);
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}
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uint64_t LogNumber() const { return logNumber_; }
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WalFileType Type() const { return type_; }
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SequenceNumber StartSequence() const { return startSequence_; }
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uint64_t SizeFileBytes() const { return sizeFileBytes_; }
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bool operator < (const LogFile& that) const {
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return LogNumber() < that.LogNumber();
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}
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private:
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uint64_t logNumber_;
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WalFileType type_;
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SequenceNumber startSequence_;
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uint64_t sizeFileBytes_;
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};
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class TransactionLogIteratorImpl : public TransactionLogIterator {
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public:
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TransactionLogIteratorImpl(const std::string& dbname,
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const Options* options,
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const EnvOptions& soptions,
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const SequenceNumber seqNum,
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std::unique_ptr<VectorLogPtr> files,
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SequenceNumber const * const lastFlushedSequence);
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virtual bool Valid();
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virtual void Next();
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virtual Status status();
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virtual BatchResult GetBatch();
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private:
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const std::string& dbname_;
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const Options* options_;
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const EnvOptions& soptions_;
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const SequenceNumber startingSequenceNumber_;
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std::unique_ptr<VectorLogPtr> files_;
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bool started_;
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bool isValid_; // not valid when it starts of.
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Status currentStatus_;
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size_t currentFileIndex_;
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std::unique_ptr<WriteBatch> currentBatch_;
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unique_ptr<log::Reader> currentLogReader_;
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Status OpenLogFile(const LogFile* logFile, unique_ptr<SequentialFile>* file);
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LogReporter reporter_;
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SequenceNumber const * const lastFlushedSequence_;
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// represents the sequence number being read currently.
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SequenceNumber currentSequence_;
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void UpdateCurrentWriteBatch(const Slice& record);
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Status OpenLogReader(const LogFile* file);
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};
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_INCLUDE_WRITES_ITERATOR_IMPL_H_
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