fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
1.7 KiB
45 lines
1.7 KiB
// Copyright (c) 2017-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 "rocksdb/db.h"
|
|
#include "rocksdb/types.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
// Data associated with a particular version of a key. A database may internally
|
|
// store multiple versions of a same user key due to snapshots, compaction not
|
|
// happening yet, etc.
|
|
struct KeyVersion {
|
|
KeyVersion() : user_key(""), value(""), sequence(0), type(0) {}
|
|
|
|
KeyVersion(const std::string& _user_key, const std::string& _value,
|
|
SequenceNumber _sequence, int _type)
|
|
: user_key(_user_key), value(_value), sequence(_sequence), type(_type) {}
|
|
|
|
std::string user_key;
|
|
std::string value;
|
|
SequenceNumber sequence;
|
|
// TODO(ajkr): we should provide a helper function that converts the int to a
|
|
// string describing the type for easier debugging.
|
|
int type;
|
|
};
|
|
|
|
// Returns listing of all versions of keys in the provided user key range.
|
|
// The range is inclusive-inclusive, i.e., [`begin_key`, `end_key`], or
|
|
// `max_num_ikeys` has been reached. Since all those keys returned will be
|
|
// copied to memory, if the range covers too many keys, the memory usage
|
|
// may be huge. `max_num_ikeys` can be used to cap the memory usage.
|
|
// The result is inserted into the provided vector, `key_versions`.
|
|
Status GetAllKeyVersions(DB* db, Slice begin_key, Slice end_key,
|
|
size_t max_num_ikeys,
|
|
std::vector<KeyVersion>* key_versions);
|
|
|
|
} // namespace rocksdb
|
|
|
|
#endif // ROCKSDB_LITE
|
|
|