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571d0d541c
* common/Types.h → common/types.h Also split Core/Defines.h and merge with common/likely.h * Improve cctz contrib * Fix ALWAYS_INLINE and unbundled build * Update Dockerfile from master * Fix test for unbundled library
59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
#pragma once
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#include "DateLUTImpl.h"
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#include "defines.h"
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#include <boost/noncopyable.hpp>
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#include <atomic>
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#include <memory>
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#include <mutex>
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#include <unordered_map>
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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 : private boost::noncopyable
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{
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public:
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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 = getInstance();
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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 = getInstance();
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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 = getInstance();
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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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static DateLUT & getInstance();
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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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