Class data_provider¶
Defined in File DataProvider.h
Inheritance Relationships¶
Derived Types¶
public ral::io::abstractsql_data_provider(Class abstractsql_data_provider)public ral::io::gdf_data_provider(Class gdf_data_provider)public ral::io::uri_data_provider(Class uri_data_provider)
Class Documentation¶
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class
ral::io::data_provider¶ A class we can use which will be the base for all of our data providers
Subclassed by ral::io::abstractsql_data_provider, ral::io::gdf_data_provider, ral::io::uri_data_provider
Public Functions
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virtual std::shared_ptr<data_provider>
clone() = 0¶
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virtual bool
has_next() = 0¶ tells us if this provider can generate more arrow::io::RandomAccessFile instances
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virtual void
reset() = 0¶ Resets file read count to 0 for file based DataProvider
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virtual data_handle
get_next(bool open_file = true) = 0¶ gets us the next arrow::io::RandomAccessFile
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virtual std::vector<data_handle>
get_some(std::size_t num_files, bool open_file = true) = 0¶ Tries to get up to num_files data_handles. We use this instead of a get_all() because if there are too many files, trying to get too many file handles will cause a crash. Using get_some() forces breaking up the process of getting file_handles.
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virtual void
close_file_handles() = 0¶ Closes currently open set of file handles maintained by the provider
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virtual size_t
get_num_handles() = 0¶ Get the number of data_handles that will be provided.
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virtual std::shared_ptr<data_provider>