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.
43 lines
1.7 KiB
43 lines
1.7 KiB
// 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).
|
|
//
|
|
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
|
|
#pragma once
|
|
#include "rocksdb/iterator.h"
|
|
#include "rocksdb/env.h"
|
|
#include "table/iterator_wrapper.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
struct ReadOptions;
|
|
class InternalKeyComparator;
|
|
|
|
// TwoLevelIteratorState expects iterators are not created using the arena
|
|
struct TwoLevelIteratorState {
|
|
TwoLevelIteratorState() {}
|
|
|
|
virtual ~TwoLevelIteratorState() {}
|
|
virtual InternalIteratorBase<IndexValue>* NewSecondaryIterator(
|
|
const BlockHandle& handle) = 0;
|
|
};
|
|
|
|
// Return a new two level iterator. A two-level iterator contains an
|
|
// index iterator whose values point to a sequence of blocks where
|
|
// each block is itself a sequence of key,value pairs. The returned
|
|
// two-level iterator yields the concatenation of all key/value pairs
|
|
// in the sequence of blocks. Takes ownership of "index_iter" and
|
|
// will delete it when no longer needed.
|
|
//
|
|
// Uses a supplied function to convert an index_iter value into
|
|
// an iterator over the contents of the corresponding block.
|
|
// Note: this function expects first_level_iter was not created using the arena
|
|
extern InternalIteratorBase<IndexValue>* NewTwoLevelIterator(
|
|
TwoLevelIteratorState* state,
|
|
InternalIteratorBase<IndexValue>* first_level_iter);
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|