74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
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// 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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#include "table/block_based/binary_search_index_reader.h"
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namespace ROCKSDB_NAMESPACE {
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Status BinarySearchIndexReader::Create(
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const BlockBasedTable* table, FilePrefetchBuffer* prefetch_buffer,
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bool use_cache, bool prefetch, bool pin,
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BlockCacheLookupContext* lookup_context,
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std::unique_ptr<IndexReader>* index_reader) {
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assert(table != nullptr);
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assert(table->get_rep());
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assert(!pin || prefetch);
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assert(index_reader != nullptr);
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CachableEntry<Block> index_block;
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if (prefetch || !use_cache) {
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const Status s =
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ReadIndexBlock(table, prefetch_buffer, ReadOptions(), use_cache,
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/*get_context=*/nullptr, lookup_context, &index_block);
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if (!s.ok()) {
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return s;
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}
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if (use_cache && !pin) {
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index_block.Reset();
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}
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}
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index_reader->reset(
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new BinarySearchIndexReader(table, std::move(index_block)));
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return Status::OK();
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}
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InternalIteratorBase<IndexValue>* BinarySearchIndexReader::NewIterator(
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const ReadOptions& read_options, bool /* disable_prefix_seek */,
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IndexBlockIter* iter, GetContext* get_context,
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BlockCacheLookupContext* lookup_context) {
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const BlockBasedTable::Rep* rep = table()->get_rep();
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const bool no_io = (read_options.read_tier == kBlockCacheTier);
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CachableEntry<Block> index_block;
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const Status s =
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GetOrReadIndexBlock(no_io, get_context, lookup_context, &index_block);
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if (!s.ok()) {
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if (iter != nullptr) {
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iter->Invalidate(s);
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return iter;
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}
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return NewErrorInternalIterator<IndexValue>(s);
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}
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Statistics* kNullStats = nullptr;
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// We don't return pinned data from index blocks, so no need
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// to set `block_contents_pinned`.
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auto it = index_block.GetValue()->NewIndexIterator(
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internal_comparator(), internal_comparator()->user_comparator(),
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rep->get_global_seqno(BlockType::kIndex), iter, kNullStats, true,
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index_has_first_key(), index_key_includes_seq(), index_value_is_full());
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assert(it != nullptr);
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index_block.TransferTo(it);
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return it;
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}
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} // namespace ROCKSDB_NAMESPACE
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