ClickHouse/dbms/include/DB/Dictionaries/HTTPDictionarySource.h

#pragma once

#include <DB/Dictionaries/IDictionarySource.h>
#include <DB/Dictionaries/DictionaryStructure.h>


namespace Poco { class Logger; }


namespace DB
{

/// Allows loading dictionaries from executable
class HTTPDictionarySource final : public IDictionarySource
{
public:
	HTTPDictionarySource(const DictionaryStructure & dict_struct_,
		const Poco::Util::AbstractConfiguration & config,
		const std::string & config_prefix,
		Block & sample_block,
		const Context & context);

	HTTPDictionarySource(const HTTPDictionarySource & other);

	BlockInputStreamPtr loadAll() override;

	BlockInputStreamPtr loadIds(const std::vector<UInt64> & ids) override;

	BlockInputStreamPtr loadKeys(
		const ConstColumnPlainPtrs & key_columns, const std::vector<std::size_t> & requested_rows) override;

	bool isModified() const override;

	bool supportsSelectiveLoad() const override;

	DictionarySourcePtr clone() const override;

	std::string toString() const override;

private:
	Poco::Logger * log;

	LocalDateTime getLastModification() const;

	const DictionaryStructure dict_struct;
	const std::string url;
	const std::string format;
	Block sample_block;
	const Context & context;
};

}