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