ClickHouse/programs/library-bridge/SharedLibraryHandler.h
2021-05-08 19:12:31 +03:00

57 lines
1.4 KiB
C++

#pragma once
#include <Common/SharedLibrary.h>
#include <common/logger_useful.h>
#include <DataStreams/OneBlockInputStream.h>
#include "LibraryUtils.h"
namespace DB
{
/// A class that manages all operations with library dictionary.
/// Every library dictionary source has its own object of this class, accessed by UUID.
class SharedLibraryHandler
{
public:
SharedLibraryHandler(
const std::string & library_path_,
const std::vector<std::string> & library_settings,
const Block & sample_block_,
const std::vector<std::string> & attributes_names_);
SharedLibraryHandler(const SharedLibraryHandler & other);
SharedLibraryHandler & operator=(const SharedLibraryHandler & other) = delete;
~SharedLibraryHandler();
BlockInputStreamPtr loadAll();
BlockInputStreamPtr loadIds(const std::vector<uint64_t> & ids);
BlockInputStreamPtr loadKeys(const Columns & key_columns);
bool isModified();
bool supportsSelectiveLoad();
const Block & getSampleBlock() { return sample_block; }
private:
Block dataToBlock(const ClickHouseLibrary::RawClickHouseLibraryTable data);
std::string library_path;
const Block sample_block;
std::vector<std::string> attributes_names;
SharedLibraryPtr library;
std::shared_ptr<CStringsHolder> settings_holder;
void * lib_data;
};
using SharedLibraryHandlerPtr = std::shared_ptr<SharedLibraryHandler>;
}