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02541e15c1
Incrementally select sstables from sstable set using token in ascending order. For leveled strategy, it returns all sstables that belong to current interval. For other strategies, it just return all sstables from the set. Useful for compaction which needs all sstables that overlap with key being currently compacted to calculate maximum purgeable timestamp. Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
/*
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* Copyright (C) 2016 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 "sstables.hh"
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#include "query-request.hh" // for partition_range; FIXME: move it out of there
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#include <seastar/core/shared_ptr.hh>
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#include <vector>
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namespace sstables {
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class sstable_set_impl;
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class incremental_selector_impl;
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class sstable_set {
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std::unique_ptr<sstable_set_impl> _impl;
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// used to support column_family::get_sstable(), which wants to return an sstable_list
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// that has a reference somewhere
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lw_shared_ptr<sstable_list> _all;
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public:
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~sstable_set();
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sstable_set(std::unique_ptr<sstable_set_impl> impl, lw_shared_ptr<sstable_list> all);
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sstable_set(const sstable_set&);
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sstable_set(sstable_set&&) noexcept;
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sstable_set& operator=(const sstable_set&);
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sstable_set& operator=(sstable_set&&) noexcept;
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std::vector<shared_sstable> select(const query::partition_range& range) const;
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lw_shared_ptr<sstable_list> all() const { return _all; }
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void insert(shared_sstable sst);
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void erase(shared_sstable sst);
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// Used to incrementally select sstables from sstable set using tokens.
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// sstable set must be alive and cannot be modified while incremental
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// selector is used.
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class incremental_selector {
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std::unique_ptr<incremental_selector_impl> _impl;
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mutable stdx::optional<nonwrapping_range<dht::token>> _current_token_range;
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mutable std::vector<shared_sstable> _current_sstables;
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public:
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~incremental_selector();
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incremental_selector(std::unique_ptr<incremental_selector_impl> impl);
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incremental_selector(incremental_selector&&) noexcept;
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const std::vector<shared_sstable>& select(const dht::token& t) const;
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};
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incremental_selector make_incremental_selector() const;
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};
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}
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