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https://github.com/facebook/rocksdb.git
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13ae16c315
Summary: This header file was including everything and the kitchen sink when it did not need to. This resulted in many places including this header when they needed other pieces instead. Cleaned up this header to only include what was needed and fixed up the remaining code to include what was now missing. Hopefully, this sort of code hygiene cleanup will speed up the builds... Pull Request resolved: https://github.com/facebook/rocksdb/pull/8930 Reviewed By: pdillinger Differential Revision: D31142788 Pulled By: mrambacher fbshipit-source-id: 6b45de3f300750c79f751f6227dece9cfd44085d
66 lines
2 KiB
C++
66 lines
2 KiB
C++
// 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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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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#include <string>
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#include <utility>
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#include "rocksdb/slice.h"
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#include "rocksdb/types.h"
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namespace ROCKSDB_NAMESPACE {
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// A helper class useful for DBImpl::Get()
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class LookupKey {
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public:
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// Initialize *this for looking up user_key at a snapshot with
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// the specified sequence number.
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LookupKey(const Slice& _user_key, SequenceNumber sequence,
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const Slice* ts = nullptr);
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~LookupKey();
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// Return a key suitable for lookup in a MemTable.
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Slice memtable_key() const {
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return Slice(start_, static_cast<size_t>(end_ - start_));
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}
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// Return an internal key (suitable for passing to an internal iterator)
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Slice internal_key() const {
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return Slice(kstart_, static_cast<size_t>(end_ - kstart_));
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}
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// Return the user key
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Slice user_key() const {
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return Slice(kstart_, static_cast<size_t>(end_ - kstart_ - 8));
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}
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private:
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// We construct a char array of the form:
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// klength varint32 <-- start_
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// userkey char[klength] <-- kstart_
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// tag uint64
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// <-- end_
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// The array is a suitable MemTable key.
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// The suffix starting with "userkey" can be used as an InternalKey.
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const char* start_;
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const char* kstart_;
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const char* end_;
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char space_[200]; // Avoid allocation for short keys
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// No copying allowed
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LookupKey(const LookupKey&);
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void operator=(const LookupKey&);
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};
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inline LookupKey::~LookupKey() {
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if (start_ != space_) delete[] start_;
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}
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} // namespace ROCKSDB_NAMESPACE
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