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42 lines
1.4 KiB
42 lines
1.4 KiB
1 year ago
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// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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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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#pragma once
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#include <memory>
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#include "rocksdb/compaction_filter.h"
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namespace ROCKSDB_NAMESPACE {
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// Abstract base class for building layered compaction filter on top of
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// user compaction filter.
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// See BlobIndexCompactionFilter or TtlCompactionFilter for a basic usage.
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class LayeredCompactionFilterBase : public CompactionFilter {
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public:
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LayeredCompactionFilterBase(
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const CompactionFilter* _user_comp_filter,
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std::unique_ptr<const CompactionFilter> _user_comp_filter_from_factory)
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: user_comp_filter_(_user_comp_filter),
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user_comp_filter_from_factory_(
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std::move(_user_comp_filter_from_factory)) {
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if (!user_comp_filter_) {
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user_comp_filter_ = user_comp_filter_from_factory_.get();
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}
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}
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// Return a pointer to user compaction filter
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const CompactionFilter* user_comp_filter() const { return user_comp_filter_; }
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const Customizable* Inner() const override { return user_comp_filter_; }
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protected:
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const CompactionFilter* user_comp_filter_;
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private:
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std::unique_ptr<const CompactionFilter> user_comp_filter_from_factory_;
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};
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} // namespace ROCKSDB_NAMESPACE
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