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caf83a650e
* Allow use bundled *ssl library * fix * Add submodule * Fixes * fix * fixes * fixes * fix * fix * update poco * fix warnings * fix * fix * Build fixes * Build fixes * fix * fix * fix * fix * fix * fix * fix * add bat * no zookeeper in dbms * update boost * fixes * fixes * fix * fix * fix * fix * try fix * try fix * fix * fix * fix * fix * fix * fix * fix * fix * Better * fix * dh verbose * fix * dh verbose * fix * clean * Update LocalDate.h * Update LocalDateTime.h
67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
#pragma once
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#include <common/DateLUTImpl.h>
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#include <ext/singleton.h>
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#include <unordered_map>
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#include <atomic>
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#include <mutex>
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#include <memory>
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// Also defined in Core/Defines.h
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#if !defined(ALWAYS_INLINE)
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#if defined(_MSC_VER)
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#define ALWAYS_INLINE __forceinline
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#else
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#define ALWAYS_INLINE __attribute__((__always_inline__))
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#endif
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#endif
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/// This class provides lazy initialization and lookup of singleton DateLUTImpl objects for a given timezone.
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class DateLUT : public ext::singleton<DateLUT>
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{
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friend class ext::singleton<DateLUT>;
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public:
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DateLUT(const DateLUT &) = delete;
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DateLUT & operator=(const DateLUT &) = delete;
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/// Return singleton DateLUTImpl instance for the default time zone.
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static ALWAYS_INLINE const DateLUTImpl & instance()
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{
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const auto & date_lut = ext::singleton<DateLUT>::instance();
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return *date_lut.default_impl.load(std::memory_order_acquire);
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}
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/// Return singleton DateLUTImpl instance for a given time zone.
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static ALWAYS_INLINE const DateLUTImpl & instance(const std::string & time_zone)
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{
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const auto & date_lut = ext::singleton<DateLUT>::instance();
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if (time_zone.empty())
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return *date_lut.default_impl.load(std::memory_order_acquire);
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return date_lut.getImplementation(time_zone);
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}
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static void setDefaultTimezone(const std::string & time_zone)
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{
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auto & date_lut = ext::singleton<DateLUT>::instance();
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const auto & impl = date_lut.getImplementation(time_zone);
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date_lut.default_impl.store(&impl, std::memory_order_release);
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}
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protected:
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DateLUT();
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private:
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const DateLUTImpl & getImplementation(const std::string & time_zone) const;
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using DateLUTImplPtr = std::unique_ptr<DateLUTImpl>;
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/// Time zone name -> implementation.
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mutable std::unordered_map<std::string, DateLUTImplPtr> impls;
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mutable std::mutex mutex;
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std::atomic<const DateLUTImpl *> default_impl;
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};
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