8055008909
Summary: How it works: * GetUpdatesSince takes a SequenceNumber. * A LogFile with the first SequenceNumber nearest and lesser than the requested Sequence Number is found. * Seek in the logFile till the requested SeqNumber is found. * Return an iterator which contains logic to return record's one by one. Test Plan: * Test case included to check the good code path. * Will update with more test-cases. * Feedback required on test-cases. Reviewers: dhruba, emayanke Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D7119
67 lines
1.7 KiB
C++
67 lines
1.7 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 "leveldb/env.h"
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#include "leveldb/options.h"
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#include "leveldb/types.h"
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#include "leveldb/transaction_log_iterator.h"
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#include "db/log_file.h"
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#include "db/log_reader.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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uint64_t log_number;
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virtual void Corruption(size_t bytes, const Status& s) {
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Log(info_log, "%ld: dropping %d bytes; %s",
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log_number, static_cast<int>(bytes), s.ToString().c_str());
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}
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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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SequenceNumber& seqNum,
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std::vector<LogFile>* files);
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virtual ~TransactionLogIteratorImpl() {
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// TODO move to cc file.
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if (currentLogReader_ != NULL) {
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delete currentLogReader_;
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}
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delete files_;
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}
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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 void GetBatch(WriteBatch* batch);
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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 uint64_t sequenceNumber_;
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const std::vector<LogFile>* 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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Slice currentRecord_;
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log::Reader* currentLogReader_;
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Status OpenLogFile(const LogFile& logFile, SequentialFile** file);
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LogReporter NewLogReporter(uint64_t logNumber);
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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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