mirror of https://github.com/facebook/rocksdb.git
55 lines
2.0 KiB
C++
55 lines
2.0 KiB
C++
// 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.
|
|
#include "table/block_based/index_reader_common.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
Status BlockBasedTable::IndexReaderCommon::ReadIndexBlock(
|
|
const BlockBasedTable* table, FilePrefetchBuffer* prefetch_buffer,
|
|
const ReadOptions& read_options, bool use_cache, GetContext* get_context,
|
|
BlockCacheLookupContext* lookup_context,
|
|
CachableEntry<Block>* index_block) {
|
|
PERF_TIMER_GUARD(read_index_block_nanos);
|
|
|
|
assert(table != nullptr);
|
|
assert(index_block != nullptr);
|
|
assert(index_block->IsEmpty());
|
|
|
|
const Rep* const rep = table->get_rep();
|
|
assert(rep != nullptr);
|
|
|
|
const Status s = table->RetrieveBlock(
|
|
prefetch_buffer, read_options, rep->footer.index_handle(),
|
|
UncompressionDict::GetEmptyDict(), index_block, BlockType::kIndex,
|
|
get_context, lookup_context, /* for_compaction */ false, use_cache);
|
|
|
|
return s;
|
|
}
|
|
|
|
Status BlockBasedTable::IndexReaderCommon::GetOrReadIndexBlock(
|
|
bool no_io, GetContext* get_context,
|
|
BlockCacheLookupContext* lookup_context,
|
|
CachableEntry<Block>* index_block) const {
|
|
assert(index_block != nullptr);
|
|
|
|
if (!index_block_.IsEmpty()) {
|
|
index_block->SetUnownedValue(index_block_.GetValue());
|
|
return Status::OK();
|
|
}
|
|
|
|
ReadOptions read_options;
|
|
if (no_io) {
|
|
read_options.read_tier = kBlockCacheTier;
|
|
}
|
|
|
|
return ReadIndexBlock(table_, /*prefetch_buffer=*/nullptr, read_options,
|
|
cache_index_blocks(), get_context, lookup_context,
|
|
index_block);
|
|
}
|
|
} // namespace ROCKSDB_NAMESPACE
|