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rocksdb/table/two_level_iterator.h

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same 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"
namespace rocksdb {
struct ReadOptions;
class InternalKeyComparator;
// 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.
extern Iterator* NewTwoLevelIterator(
Iterator* index_iter,
Iterator* (*block_function)(
void* arg, const ReadOptions& options, const EnvOptions& soptions,
const InternalKeyComparator& internal_comparator,
const Slice& index_value, bool for_compaction),
void* arg, const ReadOptions& options, const EnvOptions& soptions,
const InternalKeyComparator& internal_comparator,
bool for_compaction = false);
} // namespace rocksdb