7cfd278c32
As part of changing the codebase to flat_mutation_reader_v2, change size_estimates_virtual_reader. Since the bulk of the work is done by make_flat_mutation_reader_from_mutations() (which is unchanged), only glue code is affected. It is also not performance sensitive, so the extra conversions are unimportant. Test: unit (dev) Closes #9707
85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/*
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* Copyright (C) 2016-present ScyllaDB
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*
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* Modified by 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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#include "flat_mutation_reader_v2.hh"
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#include "db/system_keyspace.hh"
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class database;
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namespace db {
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namespace size_estimates {
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struct token_range {
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bytes start;
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bytes end;
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};
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class size_estimates_mutation_reader final : public flat_mutation_reader_v2::impl {
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database& _db;
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const dht::partition_range* _prange;
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const query::partition_slice& _slice;
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using ks_range = std::vector<sstring>;
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std::optional<ks_range> _keyspaces;
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ks_range::const_iterator _current_partition;
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streamed_mutation::forwarding _fwd;
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flat_mutation_reader_v2_opt _partition_reader;
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public:
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size_estimates_mutation_reader(database& db, schema_ptr, reader_permit, const dht::partition_range&, const query::partition_slice&, streamed_mutation::forwarding);
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virtual future<> fill_buffer() override;
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virtual future<> next_partition() override;
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virtual future<> fast_forward_to(const dht::partition_range&) override;
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virtual future<> fast_forward_to(position_range) override;
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virtual future<> close() noexcept override;
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private:
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future<> get_next_partition();
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future<> close_partition_reader() noexcept;
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std::vector<db::system_keyspace::range_estimates>
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estimates_for_current_keyspace(std::vector<token_range> local_ranges) const;
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};
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struct virtual_reader {
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database& db;
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flat_mutation_reader_v2 operator()(schema_ptr schema,
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reader_permit permit,
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const dht::partition_range& range,
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr) {
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return make_flat_mutation_reader_v2<size_estimates_mutation_reader>(db, std::move(schema), std::move(permit), range, slice, fwd);
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}
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virtual_reader(database& db_) noexcept : db(db_) {}
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};
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future<std::vector<token_range>> test_get_local_ranges(database& db);
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} // namespace size_estimates
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} // namespace db
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