ClickHouse/dbms/src/Storages/StorageFactory.h

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#pragma once
#include <Storages/IStorage.h>
#include <ext/singleton.h>
#include <unordered_map>
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namespace DB
{
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class Context;
class ASTCreateQuery;
class ASTStorage;
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/** Allows to create a table by the name and parameters of the engine.
* In 'columns' Nested data structures must be flattened.
* You should subsequently call IStorage::startup method to work with table.
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*/
class StorageFactory : public ext::singleton<StorageFactory>
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{
public:
struct Arguments
{
const String & engine_name;
ASTs & engine_args;
ASTStorage * storage_def;
const ASTCreateQuery & query;
const String & data_path;
const String & table_name;
const String & database_name;
Context & local_context;
Context & context;
const ColumnsDescription & columns;
bool attach;
bool has_force_restore_data_flag;
};
using Creator = std::function<StoragePtr(const Arguments & arguments)>;
StoragePtr get(
ASTCreateQuery & query,
const String & data_path,
const String & table_name,
const String & database_name,
Context & local_context,
Context & context,
const ColumnsDescription & columns,
bool attach,
bool has_force_restore_data_flag) const;
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/// Register a table engine by its name.
/// No locking, you must register all engines before usage of get.
void registerStorage(const std::string & name, Creator creator);
const auto & getAllStorages() const
{
return storages;
}
private:
using Storages = std::unordered_map<std::string, Creator>;
Storages storages;
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};
}