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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
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
/*
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* Copyright (C) 2015-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 <seastar/util/bool_class.hh>
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#include "schema_fwd.hh"
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class atomic_cell_view;
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class collection_mutation_view;
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class row_marker;
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class row_tombstone;
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class range_tombstone;
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class tombstone;
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class position_in_partition_view;
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// When used on an entry, marks the range between this entry and the previous
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// one as continuous or discontinuous, excluding the keys of both entries.
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// This information doesn't apply to continuity of the entries themselves,
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// that is specified by is_dummy flag.
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// See class doc of mutation_partition.
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using is_continuous = seastar::bool_class<class continuous_tag>;
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// Dummy entry is an entry which is incomplete.
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// Typically used for marking bounds of continuity range.
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// See class doc of mutation_partition.
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class dummy_tag {};
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using is_dummy = seastar::bool_class<dummy_tag>;
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// Guarantees:
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//
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// - any tombstones which affect cell's liveness are visited before that cell
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//
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// - rows are visited in ascending order with respect to their keys
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//
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// - row header (accept_row) is visited before that row's cells
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//
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// - row tombstones are visited in ascending order with respect to their key prefixes
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//
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// - cells in given row are visited in ascending order with respect to their column IDs
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//
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// - static row is visited before any clustered row
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//
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// - for each column in a row only one variant of accept_(static|row)_cell() is called, appropriate
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// for column's kind (atomic or collection).
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//
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class mutation_partition_visitor {
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public:
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virtual void accept_partition_tombstone(tombstone) = 0;
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virtual void accept_static_cell(column_id, atomic_cell_view) = 0;
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virtual void accept_static_cell(column_id, collection_mutation_view) = 0;
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virtual void accept_row_tombstone(const range_tombstone&) = 0;
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virtual void accept_row(position_in_partition_view key, const row_tombstone& deleted_at, const row_marker& rm,
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is_dummy = is_dummy::no, is_continuous = is_continuous::yes) = 0;
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virtual void accept_row_cell(column_id id, atomic_cell_view) = 0;
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virtual void accept_row_cell(column_id id, collection_mutation_view) = 0;
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};
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