fdf882ded2
Summary: When dynamically linking two binaries together, different builds of RocksDB from two sources might cause errors. To provide a tool for user to solve the problem, the RocksDB namespace is changed to a flag which can be overridden in build time. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6433 Test Plan: Build release, all and jtest. Try to build with ROCKSDB_NAMESPACE with another flag. Differential Revision: D19977691 fbshipit-source-id: aa7f2d0972e1c31d75339ac48478f34f6cfcfb3e
56 lines
2.0 KiB
C++
56 lines
2.0 KiB
C++
// 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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#pragma once
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#include <cassert>
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#include "table/block_based/cachable_entry.h"
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#include "table/block_based/filter_block.h"
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namespace ROCKSDB_NAMESPACE {
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class BlockBasedTable;
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class FilePrefetchBuffer;
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// Encapsulates common functionality for the various filter block reader
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// implementations. Provides access to the filter block regardless of whether
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// it is owned by the reader or stored in the cache, or whether it is pinned
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// in the cache or not.
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template <typename TBlocklike>
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class FilterBlockReaderCommon : public FilterBlockReader {
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public:
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FilterBlockReaderCommon(const BlockBasedTable* t,
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CachableEntry<TBlocklike>&& filter_block)
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: table_(t), filter_block_(std::move(filter_block)) {
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assert(table_);
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}
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protected:
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static Status ReadFilterBlock(const BlockBasedTable* table,
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FilePrefetchBuffer* prefetch_buffer,
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const ReadOptions& read_options, bool use_cache,
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GetContext* get_context,
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BlockCacheLookupContext* lookup_context,
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CachableEntry<TBlocklike>* filter_block);
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const BlockBasedTable* table() const { return table_; }
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const SliceTransform* table_prefix_extractor() const;
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bool whole_key_filtering() const;
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bool cache_filter_blocks() const;
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Status GetOrReadFilterBlock(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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size_t ApproximateFilterBlockMemoryUsage() const;
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private:
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const BlockBasedTable* table_;
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CachableEntry<TBlocklike> filter_block_;
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};
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} // namespace ROCKSDB_NAMESPACE
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