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rocksdb/include/rocksdb/types.h

54 lines
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// 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 <stdint.h>
#include "rocksdb/slice.h"
namespace rocksdb {
// Define all public custom types here.
// Represents a sequence number in a WAL file.
typedef uint64_t SequenceNumber;
// User-oriented representation of internal key types.
enum EntryType {
kEntryPut,
kEntryDelete,
kEntrySingleDelete,
kEntryMerge,
kEntryRangeDeletion,
kEntryBlobIndex,
kEntryOther,
};
// <user key, sequence number, and entry type> tuple.
struct FullKey {
Slice user_key;
SequenceNumber sequence;
EntryType type;
FullKey()
: sequence(0)
{} // Intentionally left uninitialized (for speed)
FullKey(const Slice& u, const SequenceNumber& seq, EntryType t)
: user_key(u), sequence(seq), type(t) { }
std::string DebugString(bool hex = false) const;
void clear() {
user_key.clear();
sequence = 0;
type = EntryType::kEntryPut;
}
};
// Parse slice representing internal key to FullKey
// Parsed FullKey is valid for as long as the memory pointed to by
// internal_key is alive.
bool ParseFullKey(const Slice& internal_key, FullKey* result);
} // namespace rocksdb