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
109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
/*
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*/
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/*
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* Modified by ScyllaDB
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* Copyright (C) 2017-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: (AGPL-3.0-or-later and Apache-2.0)
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*/
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#pragma once
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#include <set>
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#include <stdexcept>
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#include <functional>
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#include <map>
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#include <variant>
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#include <vector>
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#include <seastar/core/sstring.hh>
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#include "bytes.hh"
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#include "schema_fwd.hh"
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namespace sstables {
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class file_io_extension;
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}
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namespace db {
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class commitlog_file_extension;
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class extensions {
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public:
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extensions();
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~extensions();
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using map_type = std::map<sstring, sstring>;
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using schema_ext_config = std::variant<sstring, map_type, bytes>;
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using schema_ext_create_func = std::function<seastar::shared_ptr<schema_extension>(schema_ext_config)>;
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using sstable_file_io_extension = std::unique_ptr<sstables::file_io_extension>;
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using commitlog_file_extension_ptr = std::unique_ptr<db::commitlog_file_extension>;
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/**
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* Registered extensions
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*/
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const std::map<sstring, schema_ext_create_func>& schema_extensions() const {
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return _schema_extensions;
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}
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/**
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* Returns iterable range of registered sstable IO extensions (see sstable.hh#sstable_file_io_extension)
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* For any sstables wanting to call these on file open...
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*/
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std::vector<sstables::file_io_extension*> sstable_file_io_extensions() const;
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/**
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* Returns iterable range of registered commitlog IO extensions (see commitlog_extensions.hh#commitlog_file_extension)
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* For any commitlogs wanting to call these on file open or descriptor scan...
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*/
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std::vector<db::commitlog_file_extension*> commitlog_file_extensions() const;
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/**
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* Registered extensions keywords, i.e. custom properties/propery sets
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* for schema extensions
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*/
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std::set<sstring> schema_extension_keywords() const;
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/**
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* Init time method to add schema extension.
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*/
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void add_schema_extension(sstring w, schema_ext_create_func f) {
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_schema_extensions.emplace(std::move(w), std::move(f));
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}
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/**
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* A shorthand for the add_schema_extension. Adds a function that adds
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* the extension to a schema with appropriate constructor overload.
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*/
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template<typename Extension>
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void add_schema_extension(sstring w) {
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add_schema_extension(std::move(w), [] (db::extensions::schema_ext_config cfg) {
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return std::visit([] (auto v) {
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return ::make_shared<Extension>(v);
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}, cfg);
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});
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}
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/**
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* Init time method to add sstable extension
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*/
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void add_sstable_file_io_extension(sstring n, sstable_file_io_extension);
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/**
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* Init time method to add sstable extension
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*/
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void add_commitlog_file_extension(sstring n, commitlog_file_extension_ptr);
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/**
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* Allows forcible modification of schema extensions of a schema. This should
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* not be done lightly however. In fact, it should only be done on startup
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* at most, and thus this method is non-const, i.e. you can only use it on
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* config apply.
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*/
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void add_extension_to_schema(schema_ptr, const sstring&, shared_ptr<schema_extension>);
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private:
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std::map<sstring, schema_ext_create_func> _schema_extensions;
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std::map<sstring, sstable_file_io_extension> _sstable_file_io_extensions;
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std::map<sstring, commitlog_file_extension_ptr> _commitlog_file_extensions;
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};
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}
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