ClickHouse/dbms/Dictionaries/LibraryDictionarySource.h
Ivan 97f2a2213e
Move all folders inside /dbms one level up (#9974)
* Move some code outside dbms/src folder
* Fix paths
2020-04-02 02:51:21 +03:00

86 lines
2.1 KiB
C++

#pragma once
#include <Common/SharedLibrary.h>
#include <common/LocalDateTime.h>
#include "DictionaryStructure.h"
#include <Core/ExternalResultDescription.h>
#include "IDictionarySource.h"
namespace Poco
{
class Logger;
namespace Util
{
class AbstractConfiguration;
}
}
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
}
class CStringsHolder;
/// Allows loading dictionaries from dynamic libraries (.so)
/// Experimental version
/// Example: tests/external_dictionaries/dictionary_library/dictionary_library.cpp
class LibraryDictionarySource final : public IDictionarySource
{
public:
LibraryDictionarySource(
const DictionaryStructure & dict_struct_,
const Poco::Util::AbstractConfiguration & config,
const std::string & config_prefix_,
Block & sample_block_,
const Context & context,
bool check_config);
LibraryDictionarySource(const LibraryDictionarySource & other);
LibraryDictionarySource & operator=(const LibraryDictionarySource &) = delete;
~LibraryDictionarySource() override;
BlockInputStreamPtr loadAll() override;
BlockInputStreamPtr loadUpdatedAll() override
{
throw Exception{"Method loadUpdatedAll is unsupported for LibraryDictionarySource", ErrorCodes::NOT_IMPLEMENTED};
}
BlockInputStreamPtr loadIds(const std::vector<UInt64> & ids) override;
BlockInputStreamPtr loadKeys(const Columns & key_columns, const std::vector<std::size_t> & requested_rows) override;
bool isModified() const override;
bool supportsSelectiveLoad() const override;
///Not yet supported
bool hasUpdateField() const override { return false; }
DictionarySourcePtr clone() const override;
std::string toString() const override;
private:
Poco::Logger * log;
LocalDateTime getLastModification() const;
const DictionaryStructure dict_struct;
const std::string config_prefix;
const std::string path;
Block sample_block;
SharedLibraryPtr library;
ExternalResultDescription description;
std::shared_ptr<CStringsHolder> settings;
void * lib_data = nullptr;
};
}