/usr/include/rocksdb/utilities/optimistic_transaction_db.h is in librocksdb-dev 5.8.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | // Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#ifndef ROCKSDB_LITE
#include <string>
#include <vector>
#include "rocksdb/comparator.h"
#include "rocksdb/db.h"
namespace rocksdb {
class Transaction;
// Database with Transaction support.
//
// See optimistic_transaction.h and examples/transaction_example.cc
// Options to use when starting an Optimistic Transaction
struct OptimisticTransactionOptions {
// Setting set_snapshot=true is the same as calling SetSnapshot().
bool set_snapshot = false;
// Should be set if the DB has a non-default comparator.
// See comment in WriteBatchWithIndex constructor.
const Comparator* cmp = BytewiseComparator();
};
class OptimisticTransactionDB {
public:
// Open an OptimisticTransactionDB similar to DB::Open().
static Status Open(const Options& options, const std::string& dbname,
OptimisticTransactionDB** dbptr);
static Status Open(const DBOptions& db_options, const std::string& dbname,
const std::vector<ColumnFamilyDescriptor>& column_families,
std::vector<ColumnFamilyHandle*>* handles,
OptimisticTransactionDB** dbptr);
virtual ~OptimisticTransactionDB() {}
// Starts a new Transaction.
//
// Caller is responsible for deleting the returned transaction when no
// longer needed.
//
// If old_txn is not null, BeginTransaction will reuse this Transaction
// handle instead of allocating a new one. This is an optimization to avoid
// extra allocations when repeatedly creating transactions.
virtual Transaction* BeginTransaction(
const WriteOptions& write_options,
const OptimisticTransactionOptions& txn_options =
OptimisticTransactionOptions(),
Transaction* old_txn = nullptr) = 0;
// Return the underlying Database that was opened
virtual DB* GetBaseDB() = 0;
protected:
// To Create an OptimisticTransactionDB, call Open()
explicit OptimisticTransactionDB(DB* db) {}
OptimisticTransactionDB() {}
private:
// No copying allowed
OptimisticTransactionDB(const OptimisticTransactionDB&);
void operator=(const OptimisticTransactionDB&);
};
} // namespace rocksdb
#endif // ROCKSDB_LITE
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