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109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
#pragma once
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#include <scwx/wsr88d/nexrad_file.hpp>
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#include <chrono>
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#include <memory>
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#include <string>
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namespace scwx
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{
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namespace provider
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{
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class NexradDataProvider
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{
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public:
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explicit NexradDataProvider();
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virtual ~NexradDataProvider();
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NexradDataProvider(const NexradDataProvider&) = delete;
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NexradDataProvider& operator=(const NexradDataProvider&) = delete;
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NexradDataProvider(NexradDataProvider&&) noexcept;
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NexradDataProvider& operator=(NexradDataProvider&&) noexcept;
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virtual size_t cache_size() const = 0;
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/**
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* Gets the last modified time. This is equal to the most recent object's
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* modification time. If there are no objects, the epoch is returned.
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*
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* @return Last modified time
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*/
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virtual std::chrono::system_clock::time_point last_modified() const = 0;
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/**
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* Gets the current update period. This is equal to the difference between
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* the last two objects' modification times. If there are less than two
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* objects, an update period of 0 is returned.
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*
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* @return Update period
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*/
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virtual std::chrono::seconds update_period() const = 0;
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/**
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* Finds the most recent key in the cache, no later than the time provided.
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*
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* @param time Upper-bound time for the key search
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*
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* @return NEXRAD data key
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*/
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virtual std::string FindKey(std::chrono::system_clock::time_point time) = 0;
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/**
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* Finds the most recent key in the cache.
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*
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* @return NEXRAD data key
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*/
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virtual std::string FindLatestKey() = 0;
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/**
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* Lists NEXRAD objects for the date supplied, and adds them to the cache.
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*
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* @param date Date for which to list objects
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*
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* @return - New objects found for the given date
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* - Total objects found for the given date
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*/
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virtual std::pair<size_t, size_t>
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ListObjects(std::chrono::system_clock::time_point date) = 0;
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/**
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* Loads a NEXRAD file object by the given key.
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*
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* @param key NEXRAD data key
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*
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* @return NEXRAD data
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*/
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virtual std::shared_ptr<wsr88d::NexradFile>
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LoadObjectByKey(const std::string& key) = 0;
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/**
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* Lists NEXRAD objects for the current date, and adds them to the cache. If
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* no objects have been added to the cache for the current date, the previous
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* date is also queried for data.
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*
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* @return - New objects found
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* - Total objects found
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*/
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virtual std::pair<size_t, size_t> Refresh() = 0;
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/**
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* Convert the object key to a time point.
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*
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* @key NEXRAD data key
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*
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* @return NEXRAD data time point
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*/
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virtual std::chrono::system_clock::time_point
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GetTimePointByKey(const std::string& key) const = 0;
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private:
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class Impl;
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std::unique_ptr<Impl> p;
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};
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} // namespace provider
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} // namespace scwx
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