/usr/include/rocksdb/snapshot.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 | // 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
#include "rocksdb/types.h"
namespace rocksdb {
class DB;
// Abstract handle to particular state of a DB.
// A Snapshot is an immutable object and can therefore be safely
// accessed from multiple threads without any external synchronization.
//
// To Create a Snapshot, call DB::GetSnapshot().
// To Destroy a Snapshot, call DB::ReleaseSnapshot(snapshot).
class Snapshot {
public:
// returns Snapshot's sequence number
virtual SequenceNumber GetSequenceNumber() const = 0;
protected:
virtual ~Snapshot();
};
// Simple RAII wrapper class for Snapshot.
// Constructing this object will create a snapshot. Destructing will
// release the snapshot.
class ManagedSnapshot {
public:
explicit ManagedSnapshot(DB* db);
// Instead of creating a snapshot, take ownership of the input snapshot.
ManagedSnapshot(DB* db, const Snapshot* _snapshot);
~ManagedSnapshot();
const Snapshot* snapshot();
private:
DB* db_;
const Snapshot* snapshot_;
};
} // namespace rocksdb
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