fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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58 lines
2.1 KiB
58 lines
2.1 KiB
// 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/index_reader_common.h"
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#include "block_cache.h"
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namespace ROCKSDB_NAMESPACE {
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Status BlockBasedTable::IndexReaderCommon::ReadIndexBlock(
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const BlockBasedTable* table, FilePrefetchBuffer* prefetch_buffer,
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const ReadOptions& read_options, bool use_cache, GetContext* get_context,
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BlockCacheLookupContext* lookup_context,
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CachableEntry<Block>* index_block) {
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PERF_TIMER_GUARD(read_index_block_nanos);
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assert(table != nullptr);
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assert(index_block != nullptr);
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assert(index_block->IsEmpty());
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const Rep* const rep = table->get_rep();
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assert(rep != nullptr);
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const Status s = table->RetrieveBlock(
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prefetch_buffer, read_options, rep->footer.index_handle(),
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UncompressionDict::GetEmptyDict(), &index_block->As<Block_kIndex>(),
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get_context, lookup_context, /* for_compaction */ false, use_cache,
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/* wait_for_cache */ true, /* async_read */ false);
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return s;
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}
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Status BlockBasedTable::IndexReaderCommon::GetOrReadIndexBlock(
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bool no_io, Env::IOPriority rate_limiter_priority, GetContext* get_context,
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BlockCacheLookupContext* lookup_context,
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CachableEntry<Block>* index_block) const {
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assert(index_block != nullptr);
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if (!index_block_.IsEmpty()) {
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index_block->SetUnownedValue(index_block_.GetValue());
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return Status::OK();
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}
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ReadOptions read_options;
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read_options.rate_limiter_priority = rate_limiter_priority;
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if (no_io) {
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read_options.read_tier = kBlockCacheTier;
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}
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return ReadIndexBlock(table_, /*prefetch_buffer=*/nullptr, read_options,
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cache_index_blocks(), get_context, lookup_context,
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index_block);
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}
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} // namespace ROCKSDB_NAMESPACE
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