168ade72f8
in in {fmt} before v10, it provides the specialization of `fmt::formatter<..>`
for `std::string_view` as well as the specialization of `fmt::formatter<..>`
for `fmt::string_view` which is an implementation builtin in {fmt} for
compatibility of pre-C++17. and this type is used even if the code is
compiled with C++ stadandard greater or equal to C++17. also, before v10,
the `fmt::formatter<std::string_view>::format()` is defined so it accepts
`std::string_view`. after v10, `fmt::formatter<std::string_view>` still
exists, but it is now defined using `format_as()` machinery, so it's
`format()` method does not actually accept `std::string_view`, it
accepts `fmt::string_view`, as the former can be converted to
`fmt::string_view`.
this is why we can inherit from `fmt::formatter<std::string_view>` and
use `formatter<std::string_view>::format(foo, ctx);` to implement the
`format()` method with {fmt} v9, but we cannot do this with {fmt} v10,
and we would have following compilation failure:
```
FAILED: service/CMakeFiles/service.dir/RelWithDebInfo/topology_state_machine.cc.o
/home/kefu/.local/bin/clang++ -DFMT_DEPRECATED_OSTREAM -DFMT_SHARED -DSCYLLA_BUILD_MODE=release -DSEASTAR_API_LEVEL=7 -DSEASTAR_LOGGER_COMPILE_TIME_FMT -DSEASTAR_LOGGER_TYPE_STDOUT -DSEASTAR_SCHEDULING_GROUPS_COUNT=16 -DSEASTAR_SSTRING -DXXH_PRIVATE_API -DCMAKE_INTDIR=\"RelWithDebInfo\" -I/home/kefu/dev/scylladb -I/home/kefu/dev/scylladb/build/gen -I/home/kefu/dev/scylladb/seastar/include -I/home/kefu/dev/scylladb/build/seastar/gen/include -I/home/kefu/dev/scylladb/build/seastar/gen/src -ffunction-sections -fdata-sections -O3 -g -gz -std=gnu++20 -fvisibility=hidden -Wall -Werror -Wextra -Wno-error=deprecated-declarations -Wimplicit-fallthrough -Wno-c++11-narrowing -Wno-deprecated-copy -Wno-mismatched-tags -Wno-missing-field-initializers -Wno-overloaded-virtual -Wno-unsupported-friend -Wno-enum-constexpr-conversion -Wno-unused-parameter -ffile-prefix-map=/home/kefu/dev/scylladb=. -march=westmere -mllvm -inline-threshold=2500 -fno-slp-vectorize -U_FORTIFY_SOURCE -Werror=unused-result -MD -MT service/CMakeFiles/service.dir/RelWithDebInfo/topology_state_machine.cc.o -MF service/CMakeFiles/service.dir/RelWithDebInfo/topology_state_machine.cc.o.d -o service/CMakeFiles/service.dir/RelWithDebInfo/topology_state_machine.cc.o -c /home/kefu/dev/scylladb/service/topology_state_machine.cc
/home/kefu/dev/scylladb/service/topology_state_machine.cc:254:41: error: no matching member function for call to 'format'
254 | return formatter<std::string_view>::format(it->second, ctx);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
/usr/include/fmt/core.h:2759:22: note: candidate function template not viable: no known conversion from 'seastar::basic_sstring<char, unsigned int, 15>' to 'const fmt::basic_string_view<char>' for 1st argument
2759 | FMT_CONSTEXPR auto format(const T& val, FormatContext& ctx) const
| ^ ~~~~~~~~~~~~
```
because the inherited `format()` method actually comes from
`fmt::formatter<fmt::string_view>`. to reduce the confusion, in this
change, we just inherit from `fmt::format<string_view>`, where
`string_view` is actually `fmt::string_view`. this follows
the document at
https://fmt.dev/latest/api.html#formatting-user-defined-types,
and since there is less indirection under the hood -- we do not
use the specialization created by `FMT_FORMAT_AS` which inherit
from `formatter<fmt::string_view>`, hopefully this can improve
the compilation speed a little bit. also, this change addresses
the build failure with {fmt} v10.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closes scylladb/scylladb#18299
75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
/*
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* Copyright (C) 2021-present ScyllaDB
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*
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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/core/condition-variable.hh>
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#include "schema/schema_fwd.hh"
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#include "compaction_descriptor.hh"
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class reader_permit;
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class compaction_backlog_tracker;
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namespace sstables {
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class sstable_set;
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class compaction_strategy;
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class sstables_manager;
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struct sstable_writer_config;
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}
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namespace compaction {
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class compaction_strategy_state;
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}
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namespace compaction {
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class table_state {
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public:
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virtual ~table_state() {}
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virtual const schema_ptr& schema() const noexcept = 0;
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// min threshold as defined by table.
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virtual unsigned min_compaction_threshold() const noexcept = 0;
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virtual bool compaction_enforce_min_threshold() const noexcept = 0;
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virtual const sstables::sstable_set& main_sstable_set() const = 0;
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virtual const sstables::sstable_set& maintenance_sstable_set() const = 0;
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virtual std::unordered_set<sstables::shared_sstable> fully_expired_sstables(const std::vector<sstables::shared_sstable>& sstables, gc_clock::time_point compaction_time) const = 0;
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virtual const std::vector<sstables::shared_sstable>& compacted_undeleted_sstables() const noexcept = 0;
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virtual sstables::compaction_strategy& get_compaction_strategy() const noexcept = 0;
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virtual compaction_strategy_state& get_compaction_strategy_state() noexcept = 0;
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virtual reader_permit make_compaction_reader_permit() const = 0;
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virtual sstables::sstables_manager& get_sstables_manager() noexcept = 0;
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virtual sstables::shared_sstable make_sstable() const = 0;
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virtual sstables::sstable_writer_config configure_writer(sstring origin) const = 0;
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virtual api::timestamp_type min_memtable_timestamp() const = 0;
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virtual bool memtable_has_key(const dht::decorated_key& key) const = 0;
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virtual future<> on_compaction_completion(sstables::compaction_completion_desc desc, sstables::offstrategy offstrategy) = 0;
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virtual bool is_auto_compaction_disabled_by_user() const noexcept = 0;
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virtual bool tombstone_gc_enabled() const noexcept = 0;
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virtual const tombstone_gc_state& get_tombstone_gc_state() const noexcept = 0;
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virtual compaction_backlog_tracker& get_backlog_tracker() = 0;
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virtual const std::string get_group_id() const noexcept = 0;
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virtual seastar::condition_variable& get_staging_done_condition() noexcept = 0;
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};
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} // namespace compaction
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namespace fmt {
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template <>
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struct formatter<compaction::table_state> : formatter<string_view> {
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template <typename FormatContext>
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auto format(const compaction::table_state& t, FormatContext& ctx) const {
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auto s = t.schema();
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return fmt::format_to(ctx.out(), "{}.{} compaction_group={}", s->ks_name(), s->cf_name(), t.get_group_id());
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}
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};
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} // namespace fmt
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