4393233a86
This is a helper flat_mutation_reader that wraps another reader and splits range tombstones over rows before emitting them. It is used to produce the same mutation streams for both old (ka/la) and new (mc) SSTables formats in unit tests. Signed-off-by: Vladimir Krivopalov <vladimir@scylladb.com>
60 lines
2.1 KiB
C++
60 lines
2.1 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 "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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virtual size_t buffer_size() const 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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