fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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102 lines
3.4 KiB
102 lines
3.4 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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#include "table/block_based/filter_block_reader_common.h"
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#include "monitoring/perf_context_imp.h"
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#include "table/block_based/block_based_table_reader.h"
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#include "table/block_based/parsed_full_filter_block.h"
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namespace ROCKSDB_NAMESPACE {
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template <typename TBlocklike>
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Status FilterBlockReaderCommon<TBlocklike>::ReadFilterBlock(
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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<TBlocklike>* filter_block) {
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PERF_TIMER_GUARD(read_filter_block_nanos);
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assert(table);
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assert(filter_block);
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assert(filter_block->IsEmpty());
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const BlockBasedTable::Rep* const rep = table->get_rep();
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assert(rep);
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const Status s =
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table->RetrieveBlock(prefetch_buffer, read_options, rep->filter_handle,
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UncompressionDict::GetEmptyDict(), filter_block,
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BlockType::kFilter, get_context, lookup_context,
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/* for_compaction */ false, use_cache);
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return s;
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}
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template <typename TBlocklike>
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const SliceTransform*
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FilterBlockReaderCommon<TBlocklike>::table_prefix_extractor() const {
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assert(table_);
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const BlockBasedTable::Rep* const rep = table_->get_rep();
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assert(rep);
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return rep->prefix_filtering ? rep->table_prefix_extractor.get() : nullptr;
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}
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template <typename TBlocklike>
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bool FilterBlockReaderCommon<TBlocklike>::whole_key_filtering() const {
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assert(table_);
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assert(table_->get_rep());
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return table_->get_rep()->whole_key_filtering;
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}
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template <typename TBlocklike>
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bool FilterBlockReaderCommon<TBlocklike>::cache_filter_blocks() const {
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assert(table_);
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assert(table_->get_rep());
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return table_->get_rep()->table_options.cache_index_and_filter_blocks;
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}
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template <typename TBlocklike>
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Status FilterBlockReaderCommon<TBlocklike>::GetOrReadFilterBlock(
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bool no_io, GetContext* get_context,
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BlockCacheLookupContext* lookup_context,
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CachableEntry<TBlocklike>* filter_block) const {
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assert(filter_block);
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if (!filter_block_.IsEmpty()) {
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filter_block->SetUnownedValue(filter_block_.GetValue());
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return Status::OK();
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}
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ReadOptions read_options;
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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 ReadFilterBlock(table_, nullptr /* prefetch_buffer */, read_options,
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cache_filter_blocks(), get_context, lookup_context,
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filter_block);
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}
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template <typename TBlocklike>
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size_t FilterBlockReaderCommon<TBlocklike>::ApproximateFilterBlockMemoryUsage()
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const {
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assert(!filter_block_.GetOwnValue() || filter_block_.GetValue() != nullptr);
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return filter_block_.GetOwnValue()
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? filter_block_.GetValue()->ApproximateMemoryUsage()
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: 0;
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}
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// Explicitly instantiate templates for both "blocklike" types we use.
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// This makes it possible to keep the template definitions in the .cc file.
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template class FilterBlockReaderCommon<BlockContents>;
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template class FilterBlockReaderCommon<Block>;
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template class FilterBlockReaderCommon<ParsedFullFilterBlock>;
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} // namespace ROCKSDB_NAMESPACE
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