mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-14 10:22:10 +00:00
85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
#pragma once
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#include <memory>
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#include <Poco/Logger.h>
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#include <Client/ConnectionPoolWithFailover.h>
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#include <Interpreters/Context.h>
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#include "DictionaryStructure.h"
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#include "ExternalQueryBuilder.h"
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#include "IDictionarySource.h"
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namespace DB
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{
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/** Allows loading dictionaries from local or remote ClickHouse instance
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* @todo use ConnectionPoolWithFailover
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* @todo invent a way to keep track of source modifications
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*/
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class ClickHouseDictionarySource final : public IDictionarySource
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{
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public:
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ClickHouseDictionarySource(
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const DictionaryStructure & dict_struct_,
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const Poco::Util::AbstractConfiguration & config,
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const std::string & path_to_settings,
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const std::string & config_prefix,
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const Block & sample_block_,
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const Context & context,
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const std::string & default_database);
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/// copy-constructor is provided in order to support cloneability
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ClickHouseDictionarySource(const ClickHouseDictionarySource & other);
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ClickHouseDictionarySource & operator=(const ClickHouseDictionarySource &) = delete;
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BlockInputStreamPtr loadAll() override;
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BlockInputStreamPtr loadUpdatedAll() override;
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BlockInputStreamPtr loadIds(const std::vector<UInt64> & ids) override;
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BlockInputStreamPtr loadKeys(const Columns & key_columns, const std::vector<size_t> & requested_rows) override;
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bool isModified() const override;
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bool supportsSelectiveLoad() const override { return true; }
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bool hasUpdateField() const override;
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DictionarySourcePtr clone() const override { return std::make_unique<ClickHouseDictionarySource>(*this); }
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std::string toString() const override;
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/// Used for detection whether the hashtable should be preallocated
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/// (since if there is WHERE then it can filter out too much)
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bool hasWhere() const { return !where.empty(); }
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private:
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std::string getUpdateFieldAndDate();
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BlockInputStreamPtr createStreamForSelectiveLoad(const std::string & query);
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std::string doInvalidateQuery(const std::string & request) const;
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std::chrono::time_point<std::chrono::system_clock> update_time;
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const DictionaryStructure dict_struct;
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const bool secure;
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const std::string host;
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const UInt16 port;
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const std::string user;
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const std::string password;
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const std::string db;
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const std::string table;
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const std::string where;
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const std::string update_field;
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std::string invalidate_query;
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mutable std::string invalidate_query_response;
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ExternalQueryBuilder query_builder;
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Block sample_block;
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Context context;
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const bool is_local;
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ConnectionPoolWithFailoverPtr pool;
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const std::string load_all_query;
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Poco::Logger * log = &Poco::Logger::get("ClickHouseDictionarySource");
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};
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}
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