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// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#pragma once
#include <memory>
#include "rocksdb/compaction_filter.h"
namespace ROCKSDB_NAMESPACE {
// Abstract base class for building layered compaction filter on top of
// user compaction filter.
// See BlobIndexCompactionFilter or TtlCompactionFilter for a basic usage.
class LayeredCompactionFilterBase : public CompactionFilter {
public:
LayeredCompactionFilterBase(
const CompactionFilter* _user_comp_filter,
std::unique_ptr<const CompactionFilter> _user_comp_filter_from_factory)
: user_comp_filter_(_user_comp_filter),
user_comp_filter_from_factory_(
std::move(_user_comp_filter_from_factory)) {
if (!user_comp_filter_) {
user_comp_filter_ = user_comp_filter_from_factory_.get();
}
}
// Return a pointer to user compaction filter
const CompactionFilter* user_comp_filter() const { return user_comp_filter_; }
const Customizable* Inner() const override { return user_comp_filter_; }
protected:
const CompactionFilter* user_comp_filter_;
private:
std::unique_ptr<const CompactionFilter> user_comp_filter_from_factory_;
};
} // namespace ROCKSDB_NAMESPACE
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