mirror of https://github.com/facebook/rocksdb.git
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
// Copyright 2008-present Facebook. All Rights Reserved.
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#ifndef STORAGE_LEVELDB_INCLUDE_TRANSACTION_LOG_ITERATOR_H_
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#define STORAGE_LEVELDB_INCLUDE_TRANSACTION_LOG_ITERATOR_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 BatchResult {
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SequenceNumber sequence;
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std::unique_ptr<WriteBatch> writeBatchPtr;
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};
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// A TransactionLogIterator is used to iterate over the Transaction's in a db.
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class TransactionLogIterator {
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public:
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TransactionLogIterator() {}
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virtual ~TransactionLogIterator() {}
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// An iterator is either positioned at a WriteBatch or not valid.
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// This method returns true if the iterator is valid.
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// Can read data from a valid iterator.
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virtual bool Valid() = 0;
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// Moves the iterator to the next WriteBatch.
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// REQUIRES: Valid() to be true.
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virtual void Next() = 0;
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// Return's ok if the iterator is valid.
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// Return the Error when something has gone wrong.
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virtual Status status() = 0;
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// If valid return's the current write_batch and the sequence number of the
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// latest transaction contained in the batch.
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// ONLY use if Valid() is true and status() is OK.
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virtual BatchResult GetBatch() = 0;
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};
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_INCLUDE_TRANSACTION_LOG_ITERATOR_H_
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