fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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54 lines
1.4 KiB
54 lines
1.4 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <stdint.h>
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#include "rocksdb/slice.h"
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namespace ROCKSDB_NAMESPACE {
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// Define all public custom types here.
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// Represents a sequence number in a WAL file.
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typedef uint64_t SequenceNumber;
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const SequenceNumber kMinUnCommittedSeq = 1; // 0 is always committed
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// User-oriented representation of internal key types.
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enum EntryType {
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kEntryPut,
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kEntryDelete,
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kEntrySingleDelete,
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kEntryMerge,
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kEntryRangeDeletion,
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kEntryBlobIndex,
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kEntryOther,
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};
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// <user key, sequence number, and entry type> tuple.
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struct FullKey {
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Slice user_key;
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SequenceNumber sequence;
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EntryType type;
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FullKey() : sequence(0) {} // Intentionally left uninitialized (for speed)
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FullKey(const Slice& u, const SequenceNumber& seq, EntryType t)
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: user_key(u), sequence(seq), type(t) {}
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std::string DebugString(bool hex = false) const;
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void clear() {
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user_key.clear();
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sequence = 0;
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type = EntryType::kEntryPut;
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}
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};
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// Parse slice representing internal key to FullKey
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// Parsed FullKey is valid for as long as the memory pointed to by
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// internal_key is alive.
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bool ParseFullKey(const Slice& internal_key, FullKey* result);
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} // namespace ROCKSDB_NAMESPACE
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