dd372c8457
The main user of this method, the one which required this method to return the collective buffer size of the entire reader tree, is now gone. The remaining two users just use it to check the size of the reader instance they are working with. So de-virtualize this method and reduce its responsibility to just returning the buffer size of the current reader instance.
58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
/*
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* Copyright (C) 2018 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "mutation_reader.hh"
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#include <seastar/core/future.hh>
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#include "flat_mutation_reader.hh"
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/*
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* A helper class that wraps another flat_mutation_reader
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* and splits range tombstones across rows before pushing them
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* to the buffer.
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*
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* Used for bringing mutation stream read from old SSTables formats (ka/la)
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* to the uniformed representation with that of a new format (mc).
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*/
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class normalizing_reader : public flat_mutation_reader::impl {
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flat_mutation_reader _rd;
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range_tombstone_stream _range_tombstones;
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public:
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normalizing_reader(flat_mutation_reader rd);
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virtual future<> fill_buffer(db::timeout_clock::time_point timeout) override;
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virtual void next_partition() override;
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virtual future<> fast_forward_to(const dht::partition_range& pr, db::timeout_clock::time_point timeout) override;
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virtual future<> fast_forward_to(position_range pr, db::timeout_clock::time_point timeout) override;
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};
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// Creates a mutation_reader wrapper which creates a new stream of mutations
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// with some mutations removed from the original stream.
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// MutationFilter is a callable which decides which mutations are dropped. It
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// accepts mutation const& and returns a bool. The mutation stays in the
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// stream if and only if the filter returns true.
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flat_mutation_reader make_normalizing_reader(flat_mutation_reader rd);
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