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fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
/*
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* Copyright (C) 2018-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include "replica/database.hh"
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#include "sstables/shared_sstable.hh"
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#include <seastar/core/abort_source.hh>
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#include <seastar/core/condition-variable.hh>
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#include <seastar/core/semaphore.hh>
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namespace db::view {
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class view_update_generator {
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public:
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static constexpr size_t registration_queue_size = 5;
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private:
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replica::database& _db;
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seastar::abort_source _as;
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future<> _started = make_ready_future<>();
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seastar::condition_variable _pending_sstables;
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named_semaphore _registration_sem{registration_queue_size, named_semaphore_exception_factory{"view update generator"}};
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std::unordered_map<lw_shared_ptr<replica::table>, std::vector<sstables::shared_sstable>> _sstables_with_tables;
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std::unordered_map<lw_shared_ptr<replica::table>, std::vector<sstables::shared_sstable>> _sstables_to_move;
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metrics::metric_groups _metrics;
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public:
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view_update_generator(replica::database& db) : _db(db) {
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setup_metrics();
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discover_staging_sstables();
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}
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future<> start();
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future<> stop();
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future<> register_staging_sstable(sstables::shared_sstable sst, lw_shared_ptr<replica::table> table);
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ssize_t available_register_units() const { return _registration_sem.available_units(); }
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private:
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bool should_throttle() const;
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void setup_metrics();
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void discover_staging_sstables();
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};
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}
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