f3eade2f62
Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
/*
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* Copyright (C) 2023-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include "replica/database_fwd.hh"
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#include "locator/tablets.hh"
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#include "locator/abstract_replication_strategy.hh"
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namespace locator {
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/// A holder for table's effective_replication_map which
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/// automatically switches to the latest one as long as it
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/// does not affect the tablet associated with this guard.
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///
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/// This is useful for tracking long-running operations in
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/// the context of a single tablet which we don't want to
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/// block topology barriers for other tablets, only barriers for
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/// this tablet.
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class tablet_metadata_guard {
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lw_shared_ptr<replica::table> _table;
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global_tablet_id _tablet;
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effective_replication_map_ptr _erm;
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std::optional<tablet_transition_stage> _stage;
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seastar::abort_source _abort_source;
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optimized_optional<seastar::abort_source::subscription> _callback;
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private:
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void subscribe();
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void check() noexcept;
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public:
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tablet_metadata_guard(replica::table& table, global_tablet_id tablet);
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/// Returns an abort_source which is signaled when effective_replication_map changes
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/// in a way which is relevant for the tablet associated with this guard.
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/// When this happens, the guard stops refreshing the effective_replication_map,
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/// which will block topology coordinator barriers until the guard is destroyed.
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///
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/// The abort_source is valid as long as this instance is alive.
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seastar::abort_source& get_abort_source() {
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return _abort_source;
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}
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locator::token_metadata_ptr get_token_metadata() {
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return _erm->get_token_metadata_ptr();
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}
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/// Returns tablet_map for the table of the tablet associated with this guard.
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/// The result is valid until the next deferring point.
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const locator::tablet_map& get_tablet_map() {
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return get_token_metadata()->tablets().get_tablet_map(_tablet.table);
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}
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};
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} // namespace locator
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